Bay of Bengal

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Bay of Bengal
Bay of Bengal map.png
Map of Bay of Bengal
LocationSouth Asia and Southeast Asia
Coordinates 15°N88°E / 15°N 88°E / 15; 88
Type Bay
Primary inflows Indian Ocean
Basin  countriesBangladesh
India
Indonesia
Myanmar
Sri Lanka [1] [2]
Max. length2,090 km (1,300 mi)
Max. width1,610 km (1,000 mi)
Surface area2,600,000 km2 (1,000,000 sq mi)
Average depth2,600 m (8,500 ft)
Max. depth4,694 m (15,400 ft)

The Bay of Bengal is the northeastern part of the Indian Ocean. Geographically, it is positioned between the Indian subcontinent and the Indochinese peninsula, located below the Bengal region (based on which the bay was named during the British Raj). It is the largest water region called a bay in the world.

Contents

Many South Asian and Southeast Asian countries are dependent on the Bay of Bengal. Geopolitically, the bay is bounded on the west and northwest by India, on the north by Bangladesh, and on the east by Myanmar and the Andaman and Nicobar Islands of India. Its southern limit is a line between Sangaman Kanda, Sri Lanka, and the north westernmost point of Sumatra, Indonesia. Cox's Bazar, the longest sea beach in the world and Sundarbans, the largest mangrove forest and the natural habitat of the Bengal tiger, are located along the bay.

The Bay of Bengal occupies an area of 2,600,000 square kilometres (1,000,000 sq mi). A number of large rivers flow into the Bay of Bengal: the GangesHooghly, the Padma, the BrahmaputraJamuna, the BarakSurmaMeghna, the Irrawaddy, the Godavari, the Mahanadi, the Brahmani, the Baitarani, the Krishna and the Kaveri.

Background

Extent

The International Hydrographic Organization defines the limits of the Bay of Bengal as follows: [3]

On the east: A line running from Cape Negrais (16°03'N) in Burma through the larger islands of the Andaman group, in such a way that all the narrow waters between the islands lie Eastward of the line and are excluded from the Bay of Bengal, as far as a point in Little Andaman Island in latitude 10°48'N, longitude 92°24'E and thence along the Southwest limit of the Burma Sea [A line running from "Oedjong Raja"["Ujung Raja" or "Point Raja"] ( 5°32′N95°12′E / 5.533°N 95.200°E / 5.533; 95.200 ) in Sumatra to Poeloe Bras (Breuëh) and on through the Western Islands of the Nicobar Group to Sandy Point in Little Andaman Island, in such a way that all the narrow waters appertain to the Burma Sea].
On the south: Adam's Bridge (between India and Ceylon) and from the Southern extreme of Dondra Head (South point of Ceylon) to the North point of Poeloe Bras ( 5°44′N95°04′E / 5.733°N 95.067°E / 5.733; 95.067 ).

Note: Oedjong means "cape" in Dutch language on maps of the Netherlands East Indies (Indonesia). [4]

Etymology

The bay gets its name from the historical Bengal region (modern-day Bangladesh and the Indian states of West Bengal, Tripura and the Barak valley of Southern Assam). In Ancient Indian scriptures, this water body may have been referred to as 'Mahodadhi' (Sanskrit: महोदधि, lit.'Great water receptacle'). [5] [6] [ better source needed ] Ancient Romans called it Sinus Gangeticus or Gangeticus Sinus whilst Ancient Greeks called it in Ancient Greek : Κόλπος Γαγγητικός, meaning "Gulf of the Ganges", [7] [8] and old European maps continued to use this name. [9]

The other Sanskrit names for Bay of Bengal are 'Vaṅgopasāgara' (Sanskrit: वङ्गोपसागर, lit.'Bengal Sub-sea or Bengal Bay'), 'Vaṅgasāgara' (Sanskrit: वङ्गसागर, lit.'Bengal Sea'), 'Pūrvapayodhi' (Sanskrit: पूर्वपयोधि, lit.'Eastern Ocean').[ citation needed ]

History

Ross Island, in the Andamans, was one of the main naval bases of India during World War II Andaman ross is.jpg
Ross Island, in the Andamans, was one of the main naval bases of India during World War II

In ancient Classical India, the Bay of Bengal was known as Kalinga Sagar (Kalinga Sea). [10] [11]

Northern Circars occupied the western coast of the Bay of Bengal and is now considered to be India's Odisha and Andhra Pradesh state. Chola dynasty (9th century to 12th century) when ruled by Rajaraja Chola I and Rajendra Chola I occupied and controlled the Bay of Bengal with Chola Navy circa AD 1014, the Bay of Bengal was also called the Chola Sea or Chola Lake. [10]

The Kakatiya dynasty reached the western coastline of the Bay of Bengal between the Godavari and the Krishna rivers. Kushanas about the middle of the 1st century AD invaded northern India perhaps extending as far as the Bay of Bengal. Chandragupta Maurya extended the Maurya Dynasty across northern India to the Bay of Bengal. Hajipur was a stronghold for Portuguese Pirates. In the 16th century the Portuguese built trading posts in the north of the Bay of Bengal at Chittagong (Porto Grande) and Satgaon (Porto Pequeno). [12]

The earliest sign of Muslims in the region came from the textile trade routes where one targeted the east Arabian Sea influencing migration of Arabs and Persians and another to the west causing Buddhist Bengalis to culturally mix with Islam. [13]

Historic sites

The Shore Temple, a UNESCO World Heritage Site on the shore of the Bay of Bengal. Shore Temple on Bay of Bengal.jpg
The Shore Temple, a UNESCO World Heritage Site on the shore of the Bay of Bengal.

In alphabetical order:

Marine archaeology

Maritime archaeology or marine archaeology is the study of how ancient peoples interacted with the sea and waterways. A specialized branch, archaeology of shipwrecks, studies the salvaged artifacts of ancient ships. Stone anchors, amphorae shards, elephant tusks, hippopotamus teeth, ceramic pottery, a rare wood mast and lead ingots are examples which may survive submerged for centuries for archaeologists to discover, study, and place their salvaged findings into the timeline of history. Coral reefs, tsunamis, cyclones, mangrove swamps, battles, and a criss-cross of sea routes in a high trading area combined with piracy have all contributed to shipwrecks in the Bay of Bengal. [18]

Shipwrecks and important shipping incidences

In chronological order:

Significance

Economic importance

One of the first trading ventures along the Bay of Bengal was The Company of Merchants of London Trading into the East Indies, more commonly referred to as the British East India Company. Gopalpur-on-Sea was one of their main trading centers. Other trading companies along the Bay of Bengal shorelines were the English East India Company and the French East India Company. [23]

BIMSTEC (Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation) supports free trade internationally around the Bay of Bengal between Bangladesh, Bhutan, India, Myanmar, Nepal, Sri Lanka, and Thailand.

The Sethusamudram Shipping Canal Project is a new venture proposed which would create a channel for a shipping route to link the Gulf of Mannar with the Bay of Bengal. This would connect India from east to west without the necessity of going around Sri Lanka.

Thoni and catamaran fishing boats of fishing villages thrive along the Bay of Bengal shorelines. Fishermen can catch between 26 and 44 species of marine fish. [24] In one year, the average catch is two million tons of fish from the Bay of Bengal alone. [25] Approximately 31% of the world's coastal fishermen live and work on the bay. [26]

Geostrategic importance

The Bay of Bengal is centrally located in South and Southeast Asia. It lies at the center of two huge economic blocks, the SAARC and ASEAN. It influences China's southern landlocked region in the north and major sea ports of Bangladesh and India. China, India, and Bangladesh have forged naval cooperation agreements with Malaysia, Thailand, and Indonesia to increase cooperation in checking terrorism in the high seas. [27] The Bay of Bengal's connection of South Asia to East Asia has aided in Bangladesh's efficiency of distributing natural gas to the Asia Pacific. [28]

Image of United States ships participating in the Malabar 2007 naval exercise. Aegis cruisers from the navies of Japan and Australia, and logistical support ships from Singapore and India in the Bay of Bengal took part. Malabar 07-2 exercise.jpg
Image of United States ships participating in the Malabar 2007 naval exercise. Aegis cruisers from the navies of Japan and Australia, and logistical support ships from Singapore and India in the Bay of Bengal took part.

Its outlying islands (the Andaman and Nicobar Islands) and, most importantly, major ports such as Chittagong, Mongla, Payra, Paradip, Kolkata, Chennai, Visakhapatnam, and Tuticorin, along its coast with the Bay of Bengal added to its importance. [29]

China has recently made efforts to project influence into the region through tie-ups with Myanmar and Bangladesh. [30] The United States has held major exercises with Bangladesh, Malaysia, Singapore, Thailand and recently India. [31] [32] [33] [34] The largest ever wargame in Bay of Bengal, known as Malabar 2007, was held in 2007 and naval warships from the United States, India, Singapore, Japan and Australia took part.[ citation needed ]

Large deposits of natural gas in the areas within Bangladesh's sea zone incited a serious urgency by India and Myanmar into a territorial dispute. [27] Disputes over rights of some oil and gas blocks have caused brief diplomatic spats between Myanmar and India with Bangladesh.

The disputed maritime boundary between Bangladesh and Myanmar resulted in military tensions in 2008 and 2009. The maritime dispute between Bangladesh and Myanmar settled in 2012 through the judgement of ITLOS. [35] In 2014, the dispute between India and Bangladesh was also settled in which the UN tribunal awarded Bangladesh 19,467 sq. km of the 25,602 sq. km sea area of the Bay of Bengal. [36]

Religious importance

The Bay of Bengal in the stretch of Swargadwar, the gateway to heaven in Sanskrit, in the Indian town of Puri is considered holy by Hindus.[ citation needed ]

Samudra arati or worship of the sea by disciples of the Govardhan Matha at Puri Samudra arati.jpg
Samudra arati or worship of the sea by disciples of the Govardhan Matha at Puri

The Samudra arati is a daily tradition started by the present Shankaracharya of Puri 9 years ago to honour the sacred sea. [37] The daily practise includes prayer and fire offering to the sea at Swargadwar in Puri by disciples of the Govardhana matha of the Shankaracharya. On Paush Purnima of every year the Shankaracharya himself comes out to offer prayers to the sea.[ citation needed ]

Key features

Beaches

The Sunderbans bordering the Bay of Bengal is the largest single block of tidal halophytic mangrove forest in the world. Sundarbans 09.jpg
The Sunderbans bordering the Bay of Bengal is the largest single block of tidal halophytic mangrove forest in the world.
Cox's Bazar, the longest stretch of beach in the world. Cox's Bazar boats.jpg
Cox's Bazar, the longest stretch of beach in the world.
Sea BeachLocation
Cox's Bazar Flag of Bangladesh.svg  Bangladesh
Kuakata Flag of Bangladesh.svg  Bangladesh
St. Martin's Island Flag of Bangladesh.svg  Bangladesh
Sonadia Flag of Bangladesh.svg  Bangladesh
Nijhum Dwip Flag of Bangladesh.svg  Bangladesh
Inani Beach Flag of Bangladesh.svg  Bangladesh
Teknaf Flag of Bangladesh.svg  Bangladesh
Patenga Flag of Bangladesh.svg  Bangladesh
Bakkhali Beach, West BengalFlag of India.svg  India
Digha Beach, West BengalFlag of India.svg  India
Mandarmoni Beach, West Bengal Flag of India.svg  India
Tajpur Beach, West Bengal Flag of India.svg  India
Shankarpur Beach, West Bengal Flag of India.svg  India
Talasari Beach, Odisha Flag of India.svg  India
Chandipur, Odisha Flag of India.svg  India
Gahirmatha Beach, Odisha Flag of India.svg  India
Astaranga, Odisha Flag of India.svg  India
Chandrabhaga Beach, Konark, Odisha Flag of India.svg  India
Puri, Odisha Flag of India.svg  India
Gopalpur, Odisha Flag of India.svg  India
Baruva, Andhra Pradesh Flag of India.svg  India
Bheemili, Andhra Pradesh Flag of India.svg  India
RK Beach, Visakhapatnam Flag of India.svg  India
Rushikonda, Visakhapatnam Flag of India.svg  India
Yarada, Visakhapatnam Flag of India.svg  India
Manginapudi Beach, Andhra Pradesh Flag of India.svg  India
Manginapudi Beach, Machilipatnam, Andhra Pradesh Flag of India.svg  India
Mypadu Beach, Nellore, Andhra Pradesh Flag of India.svg  India
Marina Beach, Chennai, Tamil Nadu Flag of India.svg  India
Edward Elliot's Beach, Chennai, Tamil Nadu Flag of India.svg  India
Mahabalipuram, Tamil Nadu Flag of India.svg  India
Nagapattinam, Tamil Nadu Flag of India.svg  India
Silver Beach, Cuddalore, Tamil Nadu Flag of India.svg  India
Tuticorin Beach, Tamil Nadu Flag of India.svg  India
Rameswaram Beach, Tamil Nadu Flag of India.svg  India
Velankanni Beach, Tamil Nadu Flag of India.svg  India
Serenity Beach, Pondicherry Flag of India.svg  India
Promenade Beach, Pondicherry Flag of India.svg  India
Radhanagar Beach, Andaman & Nicobar Islands Flag of India.svg  India
Ulee Lheue beachFlag of Indonesia.svg  Indonesia
Alur Nunang BeachFlag of Indonesia.svg  Indonesia
Ngapali Flag of Myanmar.svg  Myanmar
Ngwesaung Flag of Myanmar.svg  Myanmar
Chaungtha, Pathein Flag of Myanmar.svg  Myanmar
Sittwe Flag of Myanmar.svg  Myanmar
Casuarina Beach, Jaffna Flag of Sri Lanka.svg  Sri Lanka
Trincomalee Flag of Sri Lanka.svg  Sri Lanka
Navaladi Beach, Batticaloa Flag of Sri Lanka.svg  Sri Lanka

Islands

Havelock Island, Andaman Islands Havelock Island, Ethereal mangrove tree, Andaman Islands.jpg
Havelock Island, Andaman Islands

The islands in the bay are numerous, including the Andaman Islands, Nicobar Islands and Mergui Archipelago of India and Myanmar. The Cheduba group of islands, in the north-east, off the Burmese coast, are remarkable for a chain of mud volcanoes, which are occasionally active. [40]

Great Andaman is the main archipelago or island group of the Andaman Islands, whereas Ritchie's Archipelago consists of smaller islands. Only 37, or 6.5%, of the 572 islands and islets of the Andaman and Nicobar Islands are inhabited. [41]

Rivers

Many major rivers of India and Bangladesh flow west to east before draining into the Bay of Bengal. The Ganga is the northernmost of these rivers. Its main channel enters and flows through Bangladesh, where it is known as the Padma River, before joining the Meghna River. However, the Brahmaputra River flows from east to west in Assam before turning south and entering Bangladesh where it is called the Jamuna River. This joins the Padma where upon the Padma joins the Meghna River that finally drains into Bay of Bengal. The Sundarbans is a mangrove forest in the southern part of the Ganges-Brahmaputra Delta which lies in the Indian state of West Bengal and in Bangladesh. The Brahmaputra at 2,948 km (1,832 mi) is the 15th longest River in the world. It originates in Tibet. The Hooghly River, another channel of the Ganga that flows through Kolkata drains into Bay of Bengal at Sagar in West Bengal, India.[ citation needed ]

The Ganga–Brahmaputra-Barak rivers deposit nearly 1000 million tons of sediment every year. The sediment from these three rivers form the Bengal Delta and the submarine fan, a vast structure that extends from Bengal to south of the Equator, is up to 16.5 kilometres (10.3 mi) thick, and contains at least 1,130 trillion tonnes of sediment, which has accumulated over the last 17 million years at an average rate of 665 million tons per annum. [42] The fan has buried organic carbon at a rate of nearly 1.1 trillion mol/yr (13.2 million t/yr) since the early Miocene period. The three rivers currently contribute nearly 8% of the total organic carbon (TOC) deposited in the world's oceans. Due to high TOC accumulation in the deep sea bed of the Bay of Bengal, the area is rich in oil and natural gas and gas hydrate reserves. Bangladesh can reclaim land substantially and economically gain from the sea area by constructing sea dikes, bunds, causeways and by trapping the sediment from its rivers.[ citation needed ]

Further southwest of Bengal, the Mahanadi, Godavari, Krishna and Kaveri Rivers also flow from west to east across Deccan Plateau in Peninsular India and drain into the Bay of Bengal forming deltas. Many small rivers also drain directly into the Bay of Bengal forming estuaries; the shortest of them is the Cooum River at 64 km (40 mi).[ citation needed ]

While Myanmar's Irrawaddy River flows into the Andaman Sea, sediment from the river is found in the eastern Bay of Bengal. [43]

Seaports

The city of Visakhapatnam in India is a major port of the Bay of Bengal. VizagPort.jpg
The city of Visakhapatnam in India is a major port of the Bay of Bengal.

Indian ports on the bay include Paradip Port, Kolkata Port, Haldia Port, Chennai Port, Visakhapatnam Port, Kakinada Port, Pondicherry Port, Dhamra Port, and Gopalpur-on-Sea. Bangladeshi ports on the Bay are Chittagong, Mongla, Payra Port. Sri Lankan ports include Jaffna, Kankesanthurai, Batticaloa, and Trincomalee.[ citation needed ] Myanmar's main sea port includes Akyab (Sittwe). [44]

Oceanography

In alphabetical order

Geology

Lithosphere and plate tectonics

The lithosphere of the earth is broken up into what are called tectonic plates. Underneath the Bay of Bengal, which is part of the great Indo-Australian Plate and is slowly moving north east. This plate meets the Burma Microplate at the Sunda Trench. The Nicobar Islands and the Andaman Islands are part of the Burma Microplate. The India Plate subducts beneath the Burma Plate at the Sunda Trench or Java Trench. Here, the pressure of the two plates on each other increase pressure and temperature resulting in the formation of volcanoes such as the volcanoes in Myanmar, and a volcanic arc called the Sunda Arc. The Sumatra-Andaman earthquake and Asian tsunami was a result of the pressure at this zone causing a submarine earthquake which then resulted in a destructive tsunami. [45]

Marine geology

Bay of Bengal near Tenneti Park, Visakhapatnam. Bay of Bengal and Beach from Tenneti park.jpg
Bay of Bengal near Tenneti Park, Visakhapatnam.

A zone 50 m wide extending from the island of Sri Lanka and the Coromandel coast to the head of the bay, and thence southwards through a strip embracing the Andaman and Nicobar islands, is bounded by the 100 fathom line of sea bottom; some 50 m. beyond this lies the 500-fathom limit. Opposite the mouth of the Ganges, however, the intervals between these depths are very much extended by deltaic influence. [40]

Swatch of No Ground is a 14 km-wide deep sea canyon of the Bay of Bengal. The deepest recorded area of this valley is about 1340 m. [46] The submarine canyon is part of the Bengal Fan, the largest submarine fan in the world. [47] [48]

Submarine fans

Submarine fan is also known as abyssal fan. Bay of Bengal fan, known as Bengal Fan, also known as the Ganges Fan is world's largest abyssal fan, also known as deep-sea fans, underwater deltas, and submarine fans. The fan is about 3,000 km (1,900 mi) long, 1,430 km (890 mi) wide with a maximum thickness of 16.5 km (10.3 mi). [49] The fan resulted from the uplift and erosion of the Himalayas and the Tibetan Plateau produced by the collision between the Indian Plate and the Eurasian Plate. Most of the sediment is supplied by the Ganges and Brahmaputra rivers which supply the Lower Meghna delta in Bangladesh and the Hoogly delta in West Bengal (India). Several other large rivers in Bangladesh and India provide smaller contributions. [47] Turbidity currents have transported the sediment through a series of submarine canyons, some of which are more than 2,400 kilometres (1,500 mi) in length, to be deposited in the Bay of Bengal up to 30 degrees latitude from where it began. To date, the oldest sediments recovered from the Bengal fan are from Early Miocene age. [50] Their mineralogical and geochemical characteristics allow to identify their Himalayan origin and demonstrate that the Himalaya was already a major mountain range 20 million years ago. [51]

The fan completely covers the floor of the Bay of Bengal. [52] It is bordered to the west by the continental slope of eastern India, to the north by the continental slope of Bangladesh and to east by the northern part of Sunda Trench off Myanmar and the Andaman Islands, the accretionary wedge associated with subduction of the Indo-Australian Plate beneath the Sunda Plate and continues along the west side of the Ninety East Ridge. [52] [48] The Nicobar Fan, another lobe of the fan, lies east of the Ninety East Ridge. [48]

The fan is now being explored as a possible source of fossil fuels for the surrounding developing nations.

The fan was first identified by bathymetric survey in the sixties by Bruce C. Heezen and Marie Tharp which identified the abyssal cone and canyon structures. It was delineated and named by Joseph Curray and David Moore following a geological and geophysical survey in 1968. [48] [53]

Oceanographic chemistry

Coastal regions bordering the Bay of Bengal are rich in minerals. Sri Lanka, Serendib, or Ratna – Dweepa which means Gem Island. Amethyst, beryl, ruby, sapphire, topaz, and garnet are just some of the gems of Sri Lanka. Garnet and other precious gems are also found in abundance in the Indian states of Odisha and Andhra Pradesh. [54] A 2014 study found that as a result of ocean acidification, there was reduced shell thickness of marine animals and breaking strength compared to normal shells. The study also showed that the pH in Bay of Bengal fell to 7.75 compared in 1994 when it averaged 7.95. [55]

Oceanographic climate

From January to October, the current is northward flowing, and the clockwise circulation pattern is called the "East Indian Current". The Bay of Bengal monsoon moves in a northwest direction striking the Nicobar Islands, and the Andaman Islands first end of May, then coast of Mainland India by end of June.

The remainder of the year, the counterclockwise current is southwestward flowing, and the circulation pattern is called the East Indian Winter Jet. September and December see very active weather, season varsha (or monsoon), in the Bay of Bengal producing severe cyclones which affect eastern India. Several efforts have been initiated to cope with storm surge. [56]

Marine biology, flora and fauna

A spinner dolphin in Bay of Bengal Spinnarc.JPG
A spinner dolphin in Bay of Bengal
Tachypleus gigas in Odisha Tachypleus gigas.JPG
Tachypleus gigas in Odisha

The Bay of Bengal is full of biological diversity, diverging amongst coral reefs, estuaries, fish spawning and nursery areas, and mangroves. The Bay of Bengal is one of the World's 64 largest marine ecosystems.

Kerilia jerdonii is a sea snake of the Bay of Bengal. Glory of Bengal cone ( Conus bengalensis ) is just one of the seashells which can be photographed along beaches of the Bay of Bengal. [57] An endangered species, the olive ridley sea turtle can survive because of the nesting grounds made available at the Gahirmatha Marine Wildlife Sanctuary, Gahirmatha Beach, Odisha, India. Marlin, barracuda, skipjack tuna, (Katsuwonus pelamis), yellowfin tuna, Indo-Pacific humpbacked dolphin (Sousa chinensis), and Bryde's whale (Balaenoptera edeni) are a few of the marine animals. Bay of Bengal hogfish ( Bodianus neilli ) is a type of wrasse which live in turbid lagoon reefs or shallow coastal reefs. Schools of dolphins can be seen, whether they are the bottle nose dolphin (Tursiops truncatus), pantropical spotted dolphin (Stenella attenuata) or the spinner dolphin (Stenella longirostris). Tuna and dolphins usually reside in the same waters. In shallower and warmer coastal waters the Irrawaddy dolphins (Orcaella brevirostris) can be found. [58] [59]

The Great Nicobar Biosphere Reserve provides sanctuary to many animals some of which include the saltwater crocodile (Crocodylus porosus), giant leatherback sea turtle (Dermochelys coriacea), and Malayan box turtle (Cuora amboinensis kamaroma) to name a few. [60]

Another endangered species royal Bengal tiger is supported by Sundarbans a large estuarine delta that holds a mangrove area in the Ganges River Delta. [61] [62]

Transboundary issues

A transboundary issue is defined as an environmental problem in which either the cause of the problem and/or its impact is separated by a national boundary; or the problem contributes to a global environmental problem and finding regional solutions is considered to be a global environmental benefit. The eight Bay of Bengal countries have (2012) identified three major transboundary problems (or areas of concern) affecting the health of the Bay, that they can work on together. With the support of the Bay Of Bengal Large Marine Ecosystem Project (BOBLME), the eight countries are now (2012) developing responses to these issues and their causes, for future implementation as the Strategic Action Programme.

Ecological degradation

Fisheries overexploitation

Some small fishing boats are catching fish & sell them in local coastal markets. Bay of Bengal 2.jpg
Some small fishing boats are catching fish & sell them in local coastal markets.

Fisheries production in the Bay of Bengal is six million tonnes per year, more than seven percent of the world's catch. The major transboundary issues relating to shared fisheries are: a decline in the overall availability of fish resources; changes in species composition of catches; the high proportion of juvenile fish in the catch; and changes in marine biodiversity, especially through loss of vulnerable and endangered species. The transboundary nature of these issues are: that many fish stocks are shared between BOBLME countries through the transboundary migration of fish, or larvae. Fishing overlaps national jurisdictions, both legally and illegally – overcapacity and overfishing in one location forces a migration of fishers and vessels to other locations. All countries (to a greater or lesser degree) are experiencing difficulties in implementing fisheries management, especially the ecosystem approach to fisheries. Bay of Bengal countries contribute significantly to the global problem of loss of vulnerable and endangered species. The main causes of the issues are: open access to fishing grounds; Government emphasis on increasing fish catches; inappropriate government subsidies provided to fishers; increasing fishing effort, especially from trawlers and purse seiners; high consumer demand for fish, including for seed and fishmeal for aquaculture; ineffective fisheries management; and illegal and destructive fishing.[ citation needed ]

Marine habitats degradation

The Bay of Bengal is an area of high biodiversity, with many endangered and vulnerable species. The major transboundary issues relating to habitats are: the loss and degradation of mangrove habitats; degradation of coral reefs; and the loss of, and damage to, seagrasses. The transboundary nature of these major issues are: that all three critical habitats occur in all BOBLME countries. Coastal development for several varying uses of the land and sea are common in all BOBLME countries. Trade in products from all the habitats is transboundary in nature. Climate change impacts are shared by all BOBLME countries. The main causes of the issues are: food security needs of the coastal poor; lack of coastal development plans; increasing trade in products from coastal habitats; coastal development and industrialization; ineffective marine protected areas and lack of enforcement; upstream development that affects water-flow; intensive upstream agricultural practices; and increasing tourism.[ citation needed ]

Environmental degradation

Environmental hazards

The Asian brown cloud, a layer of air pollution that covers much of South Asia and the Indian Ocean every year between January and March, and possibly also during earlier and later months, hangs over the Bay of Bengal. It is considered to be a combination of vehicle exhaust, smoke from cooking fires, and industrial discharges. [63] Because of this cloud, satellites attempting to track ocean acidification and other ocean health indicators in the Bay have difficulty obtaining accurate measurements. [64]

Pollution and water quality

The major transboundary issues relating to pollution and water quality are: sewage-borne pathogens and organic load; solid waste/marine litter; increasing nutrient inputs; oil pollution; persistent organic pollutants (POPs) and persistent toxic substances (PTSs); sedimentation; and heavy metals. The transboundary nature of these issues are: discharge of untreated/partially treated sewage being a common problem. Sewage and organic discharges from the Ganges-Brahmaputra-Meghna River are likely to be transboundary. Plastics and derelict fishing gear can be transported long distances across national boundaries. Around 4 million tonnes of microplastics are estimated to come from India and Bangladesh travelling into Sundurban and subsequently the Bay of Bengal. [65] High nutrient discharges from rivers could intensify largescale hypoxia. Atmospheric transport of nutrients is inherently transboundary. Differences between countries with regard to regulation and enforcement of shipping discharges may drive discharges across boundaries. [66] Tar balls are transported long distances. POPs/PTSs and mercury, including organo-mercury, undergo long-range transport. Sedimentation and most heavy metal contamination tend to be localized and lack a strong transboundary dimension. [67] The main causes of the issues are: increasing coastal population density and urbanization; higher consumption, resulting in more waste generated per person; insufficient funds allocated to waste management; migration of industry into BOBLME countries; and proliferation of small industries.[ citation needed ] A pertinent issue is the rapid growth of the shrimp culture industry which requires use of antibiotics and chemicals for export-quality food safety but pollutes the Bay of Bengal. [68]

Tropical storms and cyclones

Cyclone Sidr at its peak near Bangladesh Sidr 2007-11-14 0445Z.jpg
Cyclone Sidr at its peak near Bangladesh

A tropical storm with rotating winds blowing at speeds of 119 km/h (74 mph) is called a cyclone when they originate over the Bay of Bengal, and called a hurricane in the Atlantic. [69] Between 100,000 and 500,000 residents of Bangladesh were killed because of the 1970 Bhola cyclone.

See also

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The 2006 North Indian Ocean cyclone season had no bounds, but cyclones tend to form between April and December, with peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.

<span class="mw-page-title-main">Cyclone Mala</span> North Indian Ocean extremely severe cyclonic storm in 2006

Extremely Severe Cyclonic Storm Mala was the strongest tropical cyclone of the 2006 North Indian Ocean cyclone season. In mid-April 2006, an area of disturbed weather formed over the southern Bay of Bengal and nearby Andaman Sea. Over a period of several days, the system became increasingly organized and was classified as a depression on April 24. Situated within a region of weak steering currents, the storm slowly intensified as it drifted in a general northward direction. It attained gale-force winds and was named Mala the next day. Conditions for strengthening improved markedly on April 27 and Mala subsequently underwent rapid intensification which culminated in the cyclone attaining its peak. Early on April 28, the cyclone had estimated winds of 185 km/h (115 mph). The Joint Typhoon Warning Center considered Mala to have been slightly stronger, classifying it as a Category 4-equivalent cyclone. Steady weakening ensued thereafter and the storm made landfall in Myanmar's Rakhine State on April 29. Rapid dissipation took place once onshore and Mala was last noted early the next morning.

<span class="mw-page-title-main">2007 North Indian Ocean cyclone season</span> North Indian Ocean tropical cyclone season

The 2007 North Indian Ocean cyclone season was one of the most active North Indian Ocean cyclone seasons on record. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.

<span class="mw-page-title-main">1970 North Indian Ocean cyclone season</span> North Indian Ocean tropical cyclone season

The 1970 North Indian Ocean cyclone season had no bounds, but tropical cyclones in the North Indian Ocean tend to form between April and December, with peaks in May and November. The 1970 season saw a total of seven cyclonic storms, of which three developed into severe cyclonic storms. The Bay of Bengal was more active than the Arabian Sea during 1970, with all of the three severe cyclonic storms in the season forming there. Unusually, none of the storms in the Arabian Sea made landfall this year. The most significant storm of the season was the Bhola cyclone, which formed in the Bay of Bengal and hit Bangladesh on November 12. The storm killed at least 500,000, making it the deadliest tropical cyclone in recorded history. The season was also the deadliest tropical cyclone season globally, with 500,805 fatalities, mostly due to the aforementioned Bhola cyclone.

<span class="mw-page-title-main">Cyclone Akash</span> North Indian Ocean cyclonic storm in 2007

Cyclonic Storm Akash was the first named tropical cyclone of the 2007 North Indian Ocean cyclone season. Warned by both India Meteorological Department (IMD) and Joint Typhoon Warning Center (JTWC), it formed from an area of disturbed weather on the Bay of Bengal on May 12, and gradually organized as it drifted northward. An eye began to develop as it approached land, and after reaching peak 3-min sustained winds of 85 km/h (55 mph) it struck about 115 km (71 mi) south of Chittagong in Bangladesh. Akash rapidly weakened over land, and advisories were discontinued on May 15.

<span class="mw-page-title-main">2002 North Indian Ocean cyclone season</span> Cyclone season in the North Indian Ocean

The 2002 North Indian Ocean cyclone season was a below average season in terms of tropical cyclone formation. The season had no official bounds, but most storms formed in either May or after October. No depressions or storms formed during the monsoon season from July to September, the first such instance on record. There are two main seas in the North Indian Ocean – the Bay of Bengal to the east of the Indian subcontinent – and the Arabian Sea to the west of India. The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center (JTWC) releases unofficial advisories. An average of four to six storms form in the North Indian Ocean every season with peaks in May and November. Cyclones occurring between the meridians 45°E and 100°E are included in the season by the IMD.

<span class="mw-page-title-main">Tropical cyclones in India</span>

India is a country in the north of Indian Ocean that is the most vulnerable to getting hit by tropical cyclones in the basin, from the east or from the west. On average, 2–3 tropical cyclones make landfall in India each year, with about one being a severe tropical cyclone or greater.

Landfall Island is the northernmost island of the Indian union territory of Andaman and Nicobar Islands. It belongs to the territory's North and Middle Andaman administrative district. The island lies 220 km (137 mi) north of Port Blair, and is situated 300 km (186 mi) south of Myanmar. It is home to the Kari tribe.

<span class="mw-page-title-main">2016 North Indian Ocean cyclone season</span> North Indian Ocean tropical cyclone season

The 2016 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation. It was the deadliest season since 2010, killing more than 400 people. The season was an average one, seeing four named storms, with one further intensifying into a very severe cyclonic storm. The first named storm, Roanu, developed on 19 May while the season's last named storm, Vardah, dissipated on 18 December. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with the two peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.

<span class="mw-page-title-main">2017 North Indian Ocean cyclone season</span> North Indian Ocean tropical cyclone season

The 2017 North Indian Ocean cyclone season was a below average yet deadly season in the annual cycle of tropical cyclone formation. This season produced only three named storms, of which one only intensified into a very severe cyclonic storm. The North Indian Ocean cyclone season has no official bounds but cyclones tend to form between April and December with the two peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean. The season began with the formation Cyclone Maarutha on April 15 and ended with the dissipation of a deep depression on December 9.

<span class="mw-page-title-main">2018 North Indian Ocean cyclone season</span> North Indian Ocean tropical cyclone season

The 2018 North Indian Ocean cyclone season was one of the most active North Indian Ocean cyclone seasons since 1992, with the formation of fourteen depressions and seven cyclones. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with the two peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.

<span class="mw-page-title-main">Cyclone Maarutha</span>

Cyclonic Storm Maarutha was the first tropical cyclone to make landfall in Myanmar in April. The first tropical cyclone and named storm of the 2017 North Indian Ocean cyclone season, Maarutha was a relatively short-lived and weak system, nonetheless causing notable damage in Myanmar. Maarutha formed from an area of low pressure over the southern Bay of Bengal on April 15. The next morning, RSMC New Delhi upgraded the low-pressure area to a Depression and designated it as BOB 01.

<span class="mw-page-title-main">2022 North Indian Ocean cyclone season</span> Tropical cyclone season

The 2022 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation. It was an above-average season in terms of depressions and average in terms of deep depressions, but slightly below average in terms of cyclonic storms. It was also the least deadly North Indian Ocean cyclone season since 1988, according to official data. The season's strongest tropical cyclone was Cyclone Asani, with maximum wind speeds of 100 km/h and a minimum barometric pressure of 982 hPa. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with the peak from May to November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.

<span class="mw-page-title-main">1968 North Indian Ocean cyclone season</span> North Indian Ocean tropical cyclone season

The 1968 North Indian Ocean cyclone season was an active cyclone season. Cyclone seasons in the Northern Indian Ocean have no official bounds, but cyclones tend to form between April and December, with peaks in May and November. These dates conventionally determine the period of each year when most tropical cyclones form in the basin. There are two main seas in the North Indian Ocean—the Bay of Bengal to the east of the Indian subcontinent, and the Arabian Sea to the west of India. The official Regional Specialized Meteorological Centre in this basin is the India Meteorological Department (IMD), while the Joint Typhoon Warning Center releases unofficial advisories. An average of four to six storms form in the North Indian Ocean every season. Cyclones occurring between the meridians 45°E and 100°E are included in the season by the IMD.

<span class="mw-page-title-main">Cyclone Sitrang</span> North Indian Ocean cyclone in 2022

Cyclonic Storm Sitrang was a weak tropical cyclone that affected India and Bangladesh in late October 2022. It was the first cyclone to make landfall Bangladesh since Cyclone Mora in 2017. Formed on 22 October offshore Andaman and Nicobar Islands, it gradually intensified and peaked as a high-end cyclonic storm before making landfall over Bangladesh close to Barisal by the early hours of 25 October.

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Further reading