Wet season

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The rainfall distribution by month in Cairns, Australia Cairns climate.svg
The rainfall distribution by month in Cairns, Australia

The wet season (sometimes called the rainy season or monsoon season) is the time of year when most of a region's average annual rainfall occurs. [1] Generally, the season lasts at least one month. [2] The term green season is also sometimes used as a euphemism by tourist authorities. [3] Areas with wet seasons are dispersed across portions of the tropics and subtropics. [4]

Contents

Under the Köppen climate classification, for tropical climates, a wet season month is defined as a month where average precipitation is 60 millimetres (2.4 in) or more. [5] In contrast to areas with savanna climates and monsoon regimes, Mediterranean climates have wet winters and dry summers. Dry and rainy months are characteristic of tropical seasonal forests: in contrast to tropical rainforests, which do not have dry or wet seasons, since their rainfall is equally distributed throughout the year. [6] Some areas with pronounced rainy seasons will see a break in rainfall mid-season, when the Intertropical Convergence Zone or monsoon trough moves to higher latitudes in the middle of the warm season. [7]

When the wet season occurs during a warm season, or summer, precipitation falls mainly during the late afternoon and early evening. In the wet season, air quality improves, fresh water quality improves, and vegetation grows substantially, leading to crop yields late in the season. Rivers overflow their banks, and some animals retreat to higher ground. Soil nutrients diminish and erosion increases. The incidence of malaria and dengue increases in areas where the rainy season coincides with high temperatures, particularly in tropical areas. [8] Some animals have adaptation and survival strategies for the wet season. Often, the previous dry season leads to food shortages in the wet season, as the crops have yet to mature. Crops which can be successfully planted during the wet or rainy season are cassava, maize, groundnut, millet, rice and yam. [9] The temperate counterpart to the tropical wet season is spring or autumn.

Character of the rainfall

A wet-season storm at night in Darwin, Australia Darwin thunderstorm.jpg
A wet-season storm at night in Darwin, Australia

In areas where the heavy rainfall is associated with a wind shift, the wet season is known as the monsoon season. Many tropical and subtropical climates experience monsoon rainfall patterns. [10] Rainfall in the wet season is mainly due to daytime heating, which leads to diurnal thunderstorm activity within a pre-existing moist airmass , so the rain mainly falls in late afternoon and early evening in savanna and monsoon regions.

Much of the total rainfall each day occurs in the first minutes of the downpour, [7] before the storms mature into their stratiform stage. [11] Most places have only one wet season, but areas of the tropics can have two wet seasons, because the monsoon trough, or Intertropical Convergence Zone, can pass over locations in the tropics twice per year. However, since rain forests have rainfall spread evenly through the year, they do not have a wet season. [6]

Areas affected

Monsoon floods in Bangladesh During the rainy season Chattogram,Bangladesh.jpg
Monsoon floods in Bangladesh
Long-term mean precipitation by month MeanMonthlyP.gif
Long-term mean precipitation by month

Areas with a savanna climate in Sub-Saharan Africa, such as Ghana, Burkina Faso, [12] [13] Darfur, [14] Eritrea, [15] Ethiopia, [16] and Botswana have a distinct rainy season. [17] Also subtropical areas like Florida, South and Southeast Texas, and southern Louisiana in the United States have a rainy season. [18] Monsoon regions include the Indian subcontinent, Southeast Asia (including Indonesia and Philippines), [19] northern sections of Australia, [20] Polynesia, [21] Central America, [22] western and southern Mexico, [23] the Desert Southwest of the United States, [24] southern Guyana, [25] and northeast Brazil. [26]

Northern Guyana has two wet seasons: one in early spring and the other in early winter. [25] In western Africa, there are two rainy seasons across southern sections, but only one across the north. [27] Within the Mediterranean climate regime, the west coast of the United States, the southwest coast of Australia and South Africa, the Mediterranean coastline of Italy, Spain, Greece, [28] Lebanon, Syria, Algeria, Morocco, Tunisia, and Turkey, as well as areas further inland in Western Asia which include Jordan, Northern Iraq and most parts of Iran, experience a wet season in the winter months. [29] Similarly, the wet season in the Negev Desert of Israel extends from October through May. [30] At the boundary between the Mediterranean and monsoon climates lies the Sonoran Desert, which receives the two rainy seasons associated with each climate regime. [31]

The wet season is known by many different local names throughout the world. For example, in Mexico it is known as "storm season". Different names are given to the various short "seasons" of the year by the First Nations of Northern Australia: the wet season typically experienced there from December to March is called Gudjewg. The precise meaning of the word is disputed, although it is widely accepted to relate to the severe thunderstorms, flooding, and abundant vegetation growth commonly experienced at this time. [32]


Effects

A normally dry, chapparal ecosystem following a successful wet season in Southern California EatonCanyonWetSeason.jpg
A normally dry, chapparal ecosystem following a successful wet season in Southern California

In tropical areas, when the monsoon arrives, high daytime high temperatures drop and overnight low temperatures increase, thus reducing diurnal temperature variation. [33] During the wet season, a combination of heavy rainfall and, in some places such as Hong Kong, an onshore wind, improve air quality. [34]

In Brazil, the wet season is correlated with weaker trade winds off the ocean. [26] The pH level of water becomes more balanced due to the charging of local aquifers during the wet season. [35] Water also softens, as the concentration of dissolved materials reduces during the rainy season. [36] Erosion is also increased during rainy periods. [7]

Arroyos that are dry at other times of the year fill with runoff, in some cases with water as deep as 10 feet (3.0 m). [37] Leaching of soils during periods of heavy rainfall depletes nutrients. [37] The higher runoff from land masses affects nearby ocean areas, which are more stratified, or less mixed, due to stronger surface currents forced by the heavy rainfall runoff. [38]

Floods

High rainfall can cause widespread flooding, [39] which can lead to landslides and mudflows in mountainous areas. [40] Such floods cause rivers to burst their banks and submerge homes. [41] The Ghaggar-Hakra River, which only flows during India's monsoon season, can flood and severely damage local crops. [42] Floods can be exacerbated by fires that occurred during the previous dry season, which cause soils which are sandy or composed of loam to become hydrophobic, or water repellent. [43] In various ways governments may help people deal with wet season floods. Flood plain mapping identifies which areas are more prone to flooding. [44] Instructions on controlling erosion through outreach[ clarification needed ] are also provided by telephone or the internet. [45]

Life adaptations

Equatorial savanna in the East Province of Cameroon East - Guinean Savanna 001.jpg
Equatorial savanna in the East Province of Cameroon

Humans

The wet season is the main period of vegetation growth within the Savanna climate regime. [46] However, this also means that wet season is a time for food shortages before crops reach their full maturity. [47] This causes seasonal weight changes for people in developing countries, with a drop occurring during the wet season until the time of the first harvest, when weights rebound. [48] Malaria incidence increases during periods of high temperature and heavy rainfall. [49]

Animals

Cows calve, or give birth, at the beginning of the wet season. [50] The onset of the rainy season signals the departure of the monarch butterfly from Mexico. [51] Tropical species of butterflies show larger dot markings on their wings to fend off possible predators and are more active during the wet season than the dry season. [52] Within the tropics and warmer areas of the subtropics, decreased salinity of near shore wetlands due to the rains causes an increase in crocodile nesting. [53] Other species, such as the arroyo toad, spawn within the couple of months after the seasonal rains. [54] Armadillos and rattlesnakes seek higher ground. [55]

See also

Related Research Articles

<span class="mw-page-title-main">Monsoon</span> Seasonal changes in atmospheric circulation and precipitation

A monsoon is traditionally a seasonal reversing wind accompanied by corresponding changes in precipitation but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with annual latitudinal oscillation of the Intertropical Convergence Zone (ITCZ) between its limits to the north and south of the equator. Usually, the term monsoon is used to refer to the rainy phase of a seasonally changing pattern, although technically there is also a dry phase. The term is also sometimes used to describe locally heavy but short-term rains.

<span class="mw-page-title-main">Tropics</span> Region of Earth surrounding the Equator

The tropics are the regions of Earth surrounding the Equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's axial tilt; the width of the tropics is twice the tilt. The tropics are also referred to as the tropical zone and the torrid zone.

<span class="mw-page-title-main">Precipitation</span> Product of the condensation of atmospheric water vapor that falls under gravity

In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls from clouds due to gravitational pull. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hail. Precipitation occurs when a portion of the atmosphere becomes saturated with water vapor, so that the water condenses and "precipitates" or falls. Thus, fog and mist are not precipitation; their water vapor does not condense sufficiently to precipitate, so fog and mist do not fall. Two processes, possibly acting together, can lead to air becoming saturated with water vapor: cooling the air or adding water vapor to the air. Precipitation forms as smaller droplets coalesce via collision with other rain drops or ice crystals within a cloud. Short, intense periods of rain in scattered locations are called showers.

<span class="mw-page-title-main">Subtropics</span> Geographic and climate zone

The subtropical zones or subtropics are geographical and climate zones immediately to the north and south of the tropics. Geographically part of the temperate zones of both hemispheres, they cover the middle latitudes from 23°26′09.8″ (or 23.43605°) to approximately 35° north and south. The horse latitudes lie within this range.

<span class="mw-page-title-main">Tropical climate</span> Major climate group in Köppen classification

Tropical climate is the first of the five major climate groups in the Köppen climate classification identified with the letter A. Tropical climates are defined by a monthly average temperature of 18 °C (64 °F) or higher in the coolest month, featuring hot temperatures and high humidity all year-round. Annual precipitation is often abundant in tropical climates, and shows a seasonal rhythm but may have seasonal dryness to varying degrees. There are normally only two seasons in tropical climates, a wet (rainy/monsoon) season and a dry season. The annual temperature range in tropical climates is normally very small. Sunlight is intense in these climates.

<span class="mw-page-title-main">Climate of India</span>

The climate of India consists of a wide range of weather conditions across a vast geographic scale and varied topography. Based on the Köppen system, India encompasses a diverse array of climatic subtypes. These range from arid and semi-arid regions in the west to highland, sub-arctic, tundra, and ice cap climates in the northern Himalayan regions, varying with elevation. The northern lowlands experience subtropical conditions, with some areas at higher altitudes, like Srinagar, touching continental climates. In contrast, much of the south and the east exhibit tropical climate conditions, which support lush rainforests in these territories. Many regions have starkly different microclimates, making it one of the most climatically diverse countries in the world. The country's meteorological department follows the international standard of four seasons with some local adjustments: winter, summer, monsoon or rainy season, and a post-monsoon period.

<span class="mw-page-title-main">United States rainfall climatology</span> Characteristics of weather in U.S.

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<span class="mw-page-title-main">Natural disasters in India</span>

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<span class="mw-page-title-main">Tropical savanna climate</span> Climate subtype

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<span class="mw-page-title-main">Climate of the United States</span>

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<span class="mw-page-title-main">Climate of Vietnam</span> Weather and Climate of Vietnam

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<span class="mw-page-title-main">Tropical monsoon climate</span> Climate subtype in the Köppen climate classification system

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<span class="mw-page-title-main">Climate of Asia</span>

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<span class="mw-page-title-main">Climate of Nigeria</span> Climate zones in Nigeria

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References

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