2000s Australian drought

Last updated

Cattle in 2008 on a sand island in the Murrumbidgee River which is normally underwater. The normal river level is the top of the bank behind them. Cows on a sand island in the Murrumbidgee River.jpg
Cattle in 2008 on a sand island in the Murrumbidgee River which is normally underwater. The normal river level is the top of the bank behind them.

The 2000s drought in Australia, also known as the millennium drought [1] is said by some to be the worst drought recorded since European settlement. [2]

Contents

This drought affected most of southern Australia, including its largest cities and largest agricultural region (the Murray–Darling basin). It commenced with low rainfall conditions in late 1996 and through 1997, and worsened through particularly dry years in 2001 and 2002. By 2003 it was recognised as the worst drought on record. [2]

The year 2006 was the driest on record for many parts of the country and conditions remained hot and dry through to early 2010. The emergence of La Niña weather conditions in 2010 rapidly ended the drought, and led to floods in some locations, particularly in central and southern Queensland.

The drought placed extreme pressure on agricultural production and urban water supply in much of southern Australia. It has led to the construction of six major seawater desalination plants to provide water to Australia's major cities, and to changes in the management of water in the Murray–Darling basin, particularly the formation of the Murray–Darling Basin Authority.

Prelude to drought

Beginning in the second half of 1991, a very severe drought occurred throughout Queensland which intensified in 1994 and 1995 to become the worst on record. [3] [4]

By October 1994, part of the upper Darling River system had collapsed and the Condamine River had reverted to a series of ponds. Across the state 40% of Queensland was drought declared. [5] From July to August 1995 the drought was further influenced by a strong El Niño weather pattern associated with high temperatures. According to Primary Industries Minister, Ed Casey, "the drought affected region stretched in a 200 km to 300 km wide strip from Stanthorpe to Charters Towers". [6] So few wheat and barley crops survived, about half the usual for that year, that grains had to be imported from other states. [7]

Geographic and seasonal characteristics, and compounding factors

The Bureau of Meteorology has characterised the Millennium Drought as primarily affecting: [8]

Although the period of the Millennium Drought was characterised by several El Niño weather patterns, which affect the entire southern Pacific region and typically bring hot and dry conditions to eastern Australia, it cannot be explained purely by natural variability. The Bureau of Meteorology concluded that climate change exacerbated the extent and severity of the drought. [8]

The effects of the drought on water availability was compounded by historically high temperatures over the same period. The Bureau of Meteorology's head of climate analysis, David Jones, released statistics showing that in 2007 South Australia, NSW, Victoria, the ACT and the Murray–Darling basin all set temperature records by a very large margin. 2007 was the eleventh year in a row that the Murray–Darling basin had experienced above average temperatures and was (at that time) Australia's sixth-warmest year on record. Jones warned that "There is absolutely no debate that Australia is warming... it may be time to stop describing south-eastern Australia as gripped by drought and instead accept the extreme dry as permanent." [9]

Timeline

Rainfall deciles for Australia in 1997 1997anomaly.gif
Rainfall deciles for Australia in 1997

1996 to 2000: patchy rainfall in the south-east

Dry conditions began to emerge in south-eastern Australia during late 1996 and accentuated during the strong 1997 El Niño event. [10] Rainfall in 1998, 1999 and 2000 was closer to average, with isolated areas affected by rainfall well below average.

2001 to 2005: El Niño brings on strong drought conditions

Australian rainfall deciles for 2002 2002decileanomaly - new.gif
Australian rainfall deciles for 2002

According to the Bureau of Meteorology, much of eastern Australia experienced a dry 2001. [11] 2002 was one of Australia's driest and warmest years on record, with 'remarkably widespread' dry conditions, particularly in the eastern half of the country which was again affected by El Niño conditions. It was, at the time, Australia's fourth-driest year since 1900. [12]

The El Niño weather pattern broke down during 2003 but occasional strong rainfall in 2003 and 2004 failed to alleviate the cumulative effect of persistently low rainfall in south-eastern Australia, with some measurement stations having recorded below average rainfall for eight consecutive years. [13] Rainfall in early 2005 remained below average, and better rainfall in the second half of the year again failed to break continuing drought conditions in the south-east. [14]

2006 and 2007: extreme dry and hot conditions in the Murray–Darling basin

Australian rainfall deciles for 2006 2006decileanomaly - new.gif
Australian rainfall deciles for 2006

South-east Australia experienced its second-driest year on record in 2006, particularly affecting the major agricultural region of the Murray–Darling basin. [15] Despite slightly above normal summer/autumn rainfall, the late-winter to mid-spring rainfalls failed, resulting in the 2006 annual rainfall being 40 to 60% below normal over most of southern Australia. The average rainfall in the state of South Australia was the lowest since 1900 with only 108.8 millimetres (4.28 in) of rain recorded compared to the normal winter/spring average of 376.6 millimetres (14.83 in). Across Victoria and the Murray–Darling Basin the season was the second-driest since 1900. While New South Wales' rainfall was boosted by above normal falls along the north coast of the state, the state's average rainfall for the season was the third lowest since 1900. The situation was exacerbated by temperatures being the highest on record since the 1950s. [16] [17]

In early 2007, senior weather forecasters predicted that the drought would ease along the east coast with a return to average rainfall from late February 2007. Forecasters believed that the El Niño effect that had been driving the drought since 2006 had ended. [18]

However, this did not turn out to be correct as 2007 saw record temperatures across the south of Australia, and only patchy rain. Promising early year rains transitioned into a very dry July–October period. Heavy rainfall in June and July, particularly in coastal regions of New South Wales and in Victoria's Gippsland region, together with tentative forecasts of a La Niña event, brought hope that the drought may have ended. [19] In August 2007, the Darling River flowed again after nearly a year of no flows; [20] however, the Murray-Darling Basin experienced their seventh consecutive year of below-average rain and inflows into the Basin during the winter of 2007 were still amongst the lowest on record, though marginally better than those of the winter of 2006 which had been the driest on record.

At the end of 2007 the Bureau of Meteorology estimated that south-eastern Australia had missed the equivalent of a full year's rain in the previous 11 years. [21]

Australian rainfall deciles for 2009 2009decileanomaly - new.gif
Australian rainfall deciles for 2009

2008 and 2009: continuing hot and dry conditions

2008 and 2009 saw continuing hot and dry conditions in south-eastern Australia, with occasional heavy rainfall failing to break the continuing drought. The effects of the drought were exacerbated by Australia's (then) second-hottest year on record in 2009, with record-breaking heatwaves in January, February and the second half of the year. [22]

The drought in Sydney eased around April 2008 and Sydney's main water catchments reached 65 percent, 25 per cent fuller than they were at the same time the previous year. [23] [24] However, Victoria remained drought affected, with Melbourne's water supplies dipping to around 30% by July 2008. [25] In Tasmania drought conditions worsened in 2008, with many areas reporting no significant rainfall for three years. [26]

Australian rainfall deciles for 2010 2010decileanomaly.gif
Australian rainfall deciles for 2010

2010 and 2011: La Niña finally breaks the drought

Australia's weather pattern transitioned rapidly to a wet La Niña pattern during the autumn of 2010, resulting in record-breaking rains in the Murray-Darling basin and well above average rainfall across the south-east. For many locations this was the first year of above-average rainfall since 1996. The rainfall dramatically increased surface water storage and soil moisture, effectively ending the drought in the south-east. [27]

While 70% of New South Wales was in drought at the beginning of 2010, the entire state was officially out of drought by December. The entire state experienced its wettest spring on record. Several rivers, including rivers in the outback had flooded several times, and many dams were overflowing, including the Burrendong, Burrinjuck and Pindari Dams. Canberra's dams were above 90% capacity.

The 2010 Victorian storms in March did little to help Melbourne's storage levels, but steady winter rains, and the 2010 Victorian floods in September, rapidly increased storage levels. Melbourne also recorded its average annual rainfall in 2010 for the first time since 1996, [28] and its wettest spring since 1993. [29] By 2011, Victoria was drought free for the first time in almost 15 years and was instead gripped by very wet conditions and severe flooding.

Queensland experienced heavy storms in December 2010 and January 2011, resulting in widespread flooding.

Despite Western Australia experiencing its fifth-wettest spring on record, drought in the South West, Gascoyne and Pilbara regions of Western Australia's intensified in 2010, with the regions experiencing their driest year on record. Perth's dams registered their lowest inflows on record with the city itself recording its third-driest year on record, along with the hottest spring on record. [30]

In South Australia, only two regions in the Riverland remained in drought. Heavy rains elsewhere led to bumper harvests over much of the state, this in turn led to the largest mouse plague since 1993 across parts of South Australia, West Australia and Victoria. While some farmers tried to replant, in some areas many gave up as millions of mice covered their fields. Farmers often characterised the plague as being worse than the drought. [31]

Effects of the drought

Agriculture

Drought-affected fields in the Victorian countryside Fields outside benambra.jpg
Drought-affected fields in the Victorian countryside

Agricultural production was severely affected. Australia's cotton production had dropped, with the smallest area planted in 20 years, a 66% reduction compared to five years earlier which was considered a "normal" year. The crop had been half its usual size for three of the previous five years. Water use by the industry fell by 37% between 2000/01 and 2004/05, due mainly to the drought. [32] On the order of 20 cotton communities and 10,000 people directly employed by the cotton industry were impacted by the drought. The main areas affected were in New South Wales: Menindee where the area under production was reduced by 100%, Bourke had reduced the area under production by 99%, Walgett has reduced the area under production by 95%, the Macquarie River has reduced the area under production by 74% and the Gwydir River had reduced the area under production by 60%.

Dry paddocks in the Riverina region during 2007 Riverina Sheep (during drought).jpg
Dry paddocks in the Riverina region during 2007

In Queensland the worst-affected areas were Biloela which reduced the area under production by 100%, at Dirranbandi there was a 91% reduction, Central Highlands had reduced the area under production by 82% and Darling Downs had reduced the area under production by 78%. Bourke had adequate water for only one cotton crop from 2001 to 2006. [33] Stock feed was also becoming scarce and farmers were finding it difficult to feed cattle and sheep.[ citation needed ] Dairy producers were hit particularly hard by the drought with 2004 a particularly bleak year in the sector, as a drought-caused drop in production sent revenue in the industry down by 4.5%. [34]

Environment

In June 2008 it became known that an expert panel had warned of long term, maybe irreversible, severe ecological damage for the whole Murray-Darling basin if it did not receive sufficient water by October of that year. [35]

The very low flow to the Lower River Murray in South Australia (over Lock 1) resulted in the lowest water levels in over 90 years of records. [36] The lowest water levels during the extreme low flow period were reached in April 2009 and represented a 64% and 73% reduction in the volume of Lakes Alexandrina and Albert respectively. The low water levels and inflows meant there was no outflow from the lake system during the extreme low flow period. During this period the lake levels fell below mean sea level (approximately +0.2 m AHD) downstream of the barrages, reversing the usual positive hydraulic gradient from the lake to the sea. The seawater intrusion, lack of flushing, evapoconcentration and increased resuspension resulted in severe water quality impacts [36]

Exposure and oxidation of acid sulfate soils due to falling water levels from 2007 to 2009 in the Lower River Murray and Lower Lakes also resulted in acidification of soils, lake and ground water. [37] [38] [39] Large scale engineering interventions were undertaken to prevent further acidification, including construction of a bund and pumping of water to prevent exposure and acidification of Lake Albert. [40] Management of acidification in the Lower Lakes was also undertaken using aerial limestone dosing. [41] [42]

Ironically, the easing of the drought led to a large blackwater (low dissolved oxygen) event across a large area of the River Murray during high flows in 2011. Organic carbon (dead plant material) that had been retained in the landscape during the drought was mobilised into the river system and the breakdown of this consumed dissolved oxygen. [43]

The environmental legacy of the drought persists in parts of the system. For example, as of 2014 Lake Albert salinity was still elevated four years after the drought, and acidity persists in soils and groundwater. [37] [38]

Urban water

Australia had previously relied solely on water from dams for agriculture and consumption.[ citation needed ] The drought changed the way Australia treated its water resources. Because of the long-term effects of the drought now showing, many state governments attempted to "drought-proof" their states with more permanent solutions such as grey-water water-recycling, government rebates for home-owners to install water tanks, and tougher restrictions on industries.

The citizens of Toowoomba voted on, and rejected, a referendum on using recycled sewage water. As a result, no recycled sewage was added to Toowoomba's drinking supply. [44]

Most Australian mainland capital cities faced a major water crisis with less than 50% of water storages remaining.

Sydney

Plans for a desalination project in Sydney were temporarily halted in 2005 after public opposition and the discovery of new underground aquifers. By late 2006, however, with Sydney's water storages plunging to their lowest levels since the 1950s – around 33% of capacity – the authorities decided to reinstate the project. A$1.8 billion desalination plant was then constructed at Kurnell, in southern Sydney, opening in the summer of 2009–10.

The drought in Sydney eased around April 2008 and Sydney's main water catchments reached 65 percent, 25 per cent fuller than they were at the same time the previous year. [23] [24]

Melbourne

Melbourne had rain up to 90% below the average for September and October 2006, compounding the problem of extremely low rainfall from the preceding winter months.[ citation needed ] Melbourne had also experienced high temperatures throughout October causing increased evaporation of water in dams and reservoirs, which resulted in their levels falling by around 0.1% a day. As a result of all these factors Melbourne was put on tight water restrictions and as of July 2009, water levels in its dams were at a mere 27% of capacity. [45]

Melbourne had had Stage 3a water restrictions from 1 April 2007, and narrowly avoided Stage 4 restrictions, with the minimum storage level of around 25.8% [46] remaining above the threshold of 25% for enacting Stage 4. This led to the construction of the North-South Pipeline which would divert water out of the Goulburn River and supply it to Melbourne to meet water demands. Many towns in Victoria were close to running out of water, with some of the few Victorian towns without water restrictions being in the East Gippsland water area, where reservoir levels were above 80%.

The Victorian Government also began building a $3.1 billion 150Gl (gigalitre) desalination plant, one of the world's largest. When completed in 2011, it would be capable of supplying up to a third of Melbourne's water needs. [47]

The 2010 Victorian storms in March did little to help Melbourne's storage levels, but steady winter rains, and the 2010 Victorian floods in September, rapidly increased storage levels. 2010 saw Australia officially record its wettest spring on record due to a moderate to strong La Nina developing over the region. Water restrictions were reduced to stage 3 on 2 April, and stage 2 on 1 September. [48]

Brisbane

Brisbane combined Dam levels Brisbane dam levels during drought 2000-2007.png
Brisbane combined Dam levels

Brisbane water levels reduced to under 20% of capacity, having had no substantial inflow for five years. [49]

Brisbane organised to be supplied via larger dams, a pipeline and possibly also recycling. The Gold Coast Desalination Plant was constructed at Bilinga, delivering water from 2009. [50]

The drought in Queensland had mostly eased with Brisbane recording very heavy rain in May 2009, and premier Anna Bligh announcing that South East Queensland was no longer experiencing drought. [51] Brisbane's dams were now at full capacity with the state in general experiencing its wettest spring on record. The end of the drought and heavy spring rains in Queensland culminated with devastating floods in December 2010 and January 2011.

Perth

In November 2006 Perth completed a seawater desalination plant that will supply the city with 17% of its needs. [52]

In 2010 Perth's dams registered their lowest inflows on record with the city itself recording its third-driest year on record, along with the hottest spring on record. [30]

Adelaide

Port Stanvac Desalination Plant Port Stanvac Desalination Plant P1000725.jpg
Port Stanvac Desalination Plant

In South Australia work on a small pilot desalination plant at Port Stanvac, costing $10 million and with a capacity of 100,000 litres per day, commenced in January 2008, [53] and was completed on 4 August 2008. [54] In 2007 the Federal Government pledged to contribute funds and construction began on a $1.1 billion desalination plant with a capacity of 50 gigalitres.

In June 2009 the South Australian Government announced that the plant's annual output was to be doubled from 50Gl to 100Gl, approximately 270 megalitres per day, [55] providing up to 50% of Adelaide's domestic water supply. [56]

Electricity supply

The drought had a material impact on Australia's National Electricity Market, particularly during autumn and winter 2007. It reduced output from major hydro-electric generators Snowy Hydro and Hydro Tasmania, and also constrained output from some coal-fired generators that use fresh water for cooling.

The Australian Energy Regulator found that these effects led to noticeably higher prices from around March 2007, but that these effects had largely eased by September. [57]

Policy responses

National Plan for Water Security

Then Prime Minister John Howard responded to extreme weather conditions to announce a major water policy reform agenda in January 2007, known as the National Plan for Water Security. [58]

This led to the passage of the Water Act (2007) by the Commonwealth Parliament, the formation of the Murray-Darling Basin Authority in 2008 and the publication of the Murray-Darling Basin Plan under the Gillard government in 2012.

Drought assistance

On 27 April 2012, Agriculture Minister Joe Ludwig stated that the two final areas in Australia receiving federal 'exceptional circumstances' drought support, Bundarra and Eurobodalla in New South Wales, would cease being eligible the following week. [59] The Federal Government had provided $4.5 billion in drought assistance since 2001. [60] The related move to end the exceptional circumstances interest rate subsidy program was criticised as premature by the NSW Farmers Association and National Farmers' Federation. [59] Research has shown the failure of crops and the financial problems this brings about can lead to increased stress and even suicides in some cases. To counter this rural Victoria invested in improving their mental health services during the drought period of 2001 to 2007. This played a major role in reducing the number of drought related suicides during this period. [61]

See also

Related Research Articles

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

Adelaide has a Mediterranean climate, with mild wet winters and hot dry summers.

<span class="mw-page-title-main">Drought in Australia</span> Rainfall deficiency in Australia

Drought in Australia is defined by the Australian Bureau of Meteorology as rainfall over period greater than three-months being in the lowest decile of what has been recorded for that region in the past. This definition takes into account that drought is a relative term and rainfall deficiencies need to be compared to typical rainfall patterns including seasonal variations. Specifically, drought in Australia is defined in relation to a rainfall deficiency of pastoral leases and is determined by decile analysis applied to a certain area. Note that this definition uses rainfall only because long-term records are widely available across most of Australia. However, it does not take into account other variables that might be important for establishing surface water balance, such as evaporation and condensation.

<span class="mw-page-title-main">Environment of Australia</span>

The Australian environment ranges from virtually pristine Antarctic territory and rainforests to degraded industrial areas of major cities. Forty distinct ecoregions have been identified across the Australian mainland and islands. Central Australia has a very dry climate. The interior has a number of deserts while most of the coastal areas are populated. Northern Australia experiences tropical cyclones while much of the country is prone to periodic drought. This dry and warm environment and exposure to cyclones, makes Australia particularly vulnerable to climate change -- with some areas already experiencing increases in wildfires and fragile ecosystems.

<span class="mw-page-title-main">Irrigation in Australia</span>

Irrigation is a widespread practice required in many areas of Australia, the driest inhabited continent, to supplement low rainfall with water from other sources to assist in growing crops and pasture. Overuse or poor management of irrigation is held responsible by some for environmental problems such as soil salinity and loss of habitat for native flora and fauna.

<span class="mw-page-title-main">Climate of Australia</span> Overview of the climate of Australia

Australia's climate is governed mostly by its size and by the hot, sinking air of the subtropical high pressure belt. This moves north-west and north-east with the seasons. The climate is variable, with frequent droughts lasting several seasons, thought to be caused in part by the El Niño-Southern Oscillation. Australia has a wide variety of climates due to its large geographical size. The largest part of Australia is desert or semi-arid. Only the south-east and south-west corners have a temperate climate and moderately fertile soil. The northern part of the country has a tropical climate, varying between grasslands and desert. Australia holds many heat-related records: the continent has the hottest extended region year-round, the areas with the hottest summer climate, and the highest sunshine duration.

<span class="mw-page-title-main">Climate change in Australia</span> Impacts of climate change on Australia and responses

Climate change has been a critical issue in Australia since the beginning of the 21st century. Australia is becoming hotter and more prone to extreme heat, bushfires, droughts, floods, and longer fire seasons because of climate change. Climate issues include wildfires, heatwaves, cyclones, rising sea levels, and erosion.

In Australia, the Federation Drought is the name given to a prolonged period of drought that occurred around the time of Federation in 1901.

Between 1979 and 1983 almost all of eastern Australia was affected by a major drought.

<span class="mw-page-title-main">North–South Pipeline</span> Australian water pipeline near Melbourne

The North–South Pipeline, also known as the Sugarloaf Pipeline, is a water pipeline in Central Victoria, Australia, northeast of Melbourne that is part of Victoria's water system, acting as a link between Melbourne's water grid and the Murray-Goulburn water grid, supplying water via a series of existing and proposed pipelines. The 70-kilometre pipeline was connected to Melbourne in February 2010 to carry water from the Goulburn River to Melbourne's Sugarloaf Reservoir. It is the government's policy that it only be used in times of critical human need: when Melbourne's total water storages are less than 30% full on 30 November of any year. The pipeline can transfer a portion of Lake Eildon's water that is set aside for Melbourne, called the critical water reserve. This was 38,400 megalitres at 2 June 2014, and any changes are based on Goulburn-Murray Water's advice.

<span class="mw-page-title-main">Clayton Bay</span> Town in South Australia

Clayton Bay is a town in South Australia located on Lake Alexandrina and Lower Murray River, part of the lower lakes and Coorong region at the end of the Murray River System. The town is located north of the north-east tip of Hindmarsh Island about 87 kilometres (54 mi) from Adelaide and 30.7 kilometres (19 mi) by road from Goolwa.

The 1911–16 Australian drought consisted of a series of droughts that affected various regions of Australia between the years of 1911 and 1916. Most of the dry spells during this period can be related to three El Niño events in 1911, 1913 and 1914, though rainfall deficiencies actually began in northern Australia before the first of these El Niños set in and did not ease in coastal districts of New South Wales until well after the last El Niño had firmly dissipated and trends toward very heavy rainfall developed in other areas of the continent.

As Australia's supply of freshwater is increasingly vulnerable to droughts, possibly as a result of climate change, there is an emphasis on water conservation and various regions have imposed restrictions on the use of water.

<span class="mw-page-title-main">Geography of Victoria</span> Overview of the geography of Victoria

Victoria is the southernmost mainland state of Australia. With an area of 227,444 km2 (87,817 sq mi), it is Australia's sixth largest state/territory, comparable in size to the island of Great Britain or the U.S. state of Utah. It is bound to the northwest by South Australia, directly north by New South Wales, and also shares a maritime border with Tasmania across the Bass Strait to the south. Most of Victoria's northern border lies along the Murray River. The eastern half of the state is dominated by the Australian Alps and the surrounding highlands of the Great Dividing Range, which also to a lesser extent extend far into the west of the state and ease off after The Grampians. By comparison the north and northwest of the state is extremely flat with little prominence.

Water security in Australia became a major concern in Australia in the late 20th and early 21st century as a result of population growth, recurring severe droughts, effects of climate change on Australia, environmental degradation from reduced environmental flows, competition between competing interests such as grazing, irrigation and urban water supplies, and competition between upstream and downstream users. For example, there is competition for the resources of the Darling River system between Queensland, New South Wales and South Australia. Water reform was first placed on the national agenda at the 1994 Council of Australian Governments (COAG) meeting when a strategic framework was devised. As the knowledge of surface and groundwater systems grew and the awareness of the significance of sustainable water markets increased, further water reform was agreed to at the 2004 COAG meeting, under a national blueprint known as the National Water Initiative (NWI).

<span class="mw-page-title-main">Droughts in California</span> Historical and ongoing droughts in California

The historical and ongoing droughts in California result from various complex meteorological phenomena, some of which are not fully understood by scientists.

<span class="mw-page-title-main">2014–2016 El Niño event</span> Warming of the eastern Pacific Ocean

The 2014–2016 El Niño was a warming of the eastern equatorial Pacific Ocean that resulted in an El Niño–Southern Oscillation event, with unusually warm waters developing between the coast of South America and the International Date Line. These unusually warm waters influenced the world's weather in a number of ways, which in turn significantly affected various parts of the world. These included drought conditions in Venezuela, Australia and a number of Pacific islands while significant flooding was also recorded. During the event, more tropical cyclones than normal occurred within the Pacific Ocean, while fewer than normal occurred in the Atlantic Ocean.

<span class="mw-page-title-main">Water management in Victoria</span>

Water management in Victoria deals with the management of water resources in and by the Australian State of Victoria.

<span class="mw-page-title-main">Severe weather events in Sydney</span> Extreme weather events in Sydney, Australia from the 18th century to present day

Severe weather events or extreme weather events in Sydney, Australia, include hailstorms, thunderstorms, gale, bushfires, heatwaves, drought, and flash flooding from heavy rain. Sydney is rarely affected by cyclones, although remnants of cyclones do affect the city.

<span class="mw-page-title-main">Effects of the El Niño–Southern Oscillation in Australia</span>

Effects of the El Niño–Southern Oscillation in Australia are present across most of Australia, particularly the north and the east, and are one of the main climate drivers of the country. Associated with seasonal abnormality in many areas in the world, Australia is one of the continents most affected and experiences extensive droughts alongside considerable wet periods that cause major floods. There exist three phases — El Niño, La Niña, and Neutral, which help to account for the different states of ENSO. Since 1900, there have been 28 El Niño and 19 La Niña events in Australia including the current 2023 El Niño event, which was declared on 17th of September in 2023. The events usually last for 9 to 12 months, but some can persist for two years, though the ENSO cycle generally operates over a time period from one to eight years.

2022 was an extremely wet year for Australia, coming out of a back-to-back La Niña in the summer of 2021-22, a Negative Indian Ocean Dipole developing over the winter and a third back-to-back La Niña in the spring of 2022.

References

  1. Agency, Digital Transformation. "Natural disasters in Australia – australia.gov.au". Archived from the original on 12 November 2017. Retrieved 25 September 2015.
  2. 1 2 "Rural News 03/09/2003: Worst drought on record". ABC. 3 September 2003. Retrieved 17 November 2006.
  3. Rankin, Robert. (1992) Secrets of the Scenic Rim. Rankin Publishers ISBN   0-9592418-3-3 (page 151)
  4. Collie, Gordon (26 August 1995). "Worst drought of century cripples farmers". The Courier-Mail . p. 14.
  5. Collie, Gordon. Dry tears of despair. The Courier-Mail. p. 29. 22 October 1994.
  6. Collie, Gordon. Water crisis threatens towns. The Courier Mail p. 3. 3 June 1995
  7. Coleman, Matthew (30 August 1995). "Crops worth $50m lost". The Courier-Mail .
  8. 1 2 Bureau of Meteorology (April 2015). "Recent rainfall, drought and southern Australia's long-term rainfall decline" . Retrieved 29 March 2017.
  9. Richard Macey This drought may never break Sydney Morning Herald 4 January 2008
  10. Australian Bureau of Statistics (27 February 1998). "1998 Yearbook – Climate Variability and El Nino". www.abs.gov.au. Retrieved 26 January 2017.
  11. Bureau of Meteorology (3 January 2002). "Annual Australian Climate Summary 2001". www.bom.gov.au. Retrieved 26 January 2017.
  12. Bureau of Meteorology. "Annual Australian Climate Summary 2002". www.bom.gov.au. Retrieved 26 January 2017.
  13. Bureau of Meteorology. "Annual Australian Climate Summary 2004". www.bom.gov.au. Retrieved 26 January 2017.
  14. Bureau of Meteorology. "Annual Australian Climate Statement 2005". www.bom.gov.au. Retrieved 26 January 2017.
  15. Bureau of Meteorology. "Annual Climate Statement 2006". www.bom.gov.au. Retrieved 26 January 2017.
  16. "Statement on Drought for the 3, 6, and 10-month periods ending 31 October 2006 – Drought intensifies over eastern and southern Australia as spring rains fail". Drought Statements. National Climate Centre, Bureau of Meteorciology. 3 November 2006. Retrieved 13 November 2006.
  17. Australian Drought and Climate Change Archived 26 July 2018 at the Wayback Machine , retrieved on 7 June 2007.
  18. Barlow, Karen (22 February 2007). "El Nino declared over". Water. Australian Broadcasting Corporation. Archived from the original on 17 May 2012. Retrieved 23 October 2007. The Bureau of Meteorology has declared that the El Nino which has made the drought so much worse for the past year or so has passed. A senior climatologist at the Bureau of Meteorology, Grant Beard, says it's time to be optimistic about drought-breaking rains, although the drought is far from over yet.
  19. "Is the drought over?". Sydney Radio ABC 702. Australian Broadcasting Corporation. 28 June 2007. Archived from the original on 25 December 2007. Retrieved 23 October 2007.
  20. Clarke, Sarah (28 August 2007). "Darling flow a mixed blessing". Water. Australian Broadcasting Corporation. Retrieved 27 August 2019.
  21. Bureau of Meteorology. "Annual Australian Climate Statement 2007". www.bom.gov.au. Retrieved 26 January 2017.
  22. Bureau of Meteorology. "Annual Australian Climate Statement 2009". www.bom.gov.au. Retrieved 26 January 2017.
  23. 1 2 "More of NSW moves out of drought". The Sydney Morning Herald. 9 February 2008.
  24. 1 2 "It's going to rain for months: forecaster". The Sydney Morning Herald. 10 February 2008.
  25. "Storages over the years – Melbourne Water". Archived from the original on 7 September 2010. Retrieved 3 May 2012.
  26. "Bureau says Tassie drought worsening". Australian Broadcasting Corporation. 10 October 2008. Retrieved 10 October 2008.
  27. Bureau of Meteorology. "Annual Australian Climate Statement 2010". www.bom.gov.au. Retrieved 26 January 2017.
  28. "Melbourne gets average rainfall for first time in 14 years". 25 November 2010.
  29. "Weather News – Melbourne's wettest spring in 17 years".
  30. 1 2 "WA rivers running dry".
  31. Kerry Staight Mouse plague 'worse than drought' ABC 5 July 2010
  32. ABS Water Account Australia 2004/05 figures quoted by Water and Cotton Fact Sheet of 13 February 2007 retrieved 5 March 2007 from Cotton Australia Archived 28 February 2007 at the Wayback Machine
  33. Water and Cotton Fact Sheet of 13 February 2007 retrieved 5 March 2007 from Cotton Australia Archived 28 February 2007 at the Wayback Machine
  34. "Dairy farmers face tough times". Archived from the original on 26 January 2012. Retrieved 3 May 2012.
  35. BBC News: Australian rivers face disaster
  36. 1 2 Mosley, LM; Zammit, B; Leyden, E; Heneker, TM; Hipsey, MR; Skinner, D; Aldridge, KT (2012). "The Impact of Extreme Low Flows on the Water Quality of the Lower Murray River and Lakes (South Australia)". Water Resources Management. 26: 3923–3946. doi:10.1007/s11269-012-0113-2. hdl: 11343/282625 .
  37. 1 2 Mosley LM, Palmer D, Leyden E, Fitzpatrick R, and Shand P (2014). Changes in acidity and metal geochemistry in soils, groundwater, drain and river water in the Lower Murray River after a severe drought. Science of the Total Environment 485–486: 281–291.
  38. 1 2 Mosley, LM; Zammit, B; Jolley, A; Barnett, L (2014). "Acidification of lake water due to drought". Journal of Hydrology. 511: 484–493. Bibcode:2014JHyd..511..484M. doi:10.1016/j.jhydrol.2014.02.001.
  39. Mosley, LM; Palmer, D; Leyden, E; Fitzpatrick, R; Shand, P (2014). "Acidification of floodplains due to river level decline during drought". Journal of Contaminant Hydrology. 161: 10–23. Bibcode:2014JCHyd.161...10M. doi:10.1016/j.jconhyd.2014.03.003. PMID   24732706.
  40. Hipsey, M; Salmon, U; Mosley, LM (2014). "A three-dimensional hydro-geochemical model to assess lake acidification risk". Environmental Modelling and Software. 61: 433–457. doi:10.1016/j.envsoft.2014.02.007.
  41. Mosley, LM; Zammit, B; Jolley, A; Barnett, L; Fitzpatrick, R (2014). "Monitoring and assessment of surface water acidification following rewetting of oxidised acid sulfate soils". Environmental Monitoring and Assessment. 186: 1–18. doi:10.1007/s10661-013-3350-9. PMID   23900634.
  42. Mosley, LM; Shand, P; Self, P; Fitzpatrick, R (2014). "The geochemistry during management of lake acidification caused by the rewetting of sulfuric (pH<4) acid sulfate soils". Applied Geochemistry. 41: 49–56. Bibcode:2014ApGC...41...49M. doi:10.1016/j.apgeochem.2013.11.010.
  43. Whitworth KL, Kerr JL, Mosley LM, Conallin J, Hardwick L, and Baldwin DS (2013). Options for managing hypoxic blackwater in river systems: case studies and framework, Environmental Management 114, 139–147.
  44. "Toowoomba says no to recycled water – National – smh.com.au". www.smh.com.au. Retrieved 21 December 2015.
  45. "Storage : Melbourne Water's Conserve Water". 3 January 2007. Archived from the original on 3 January 2007.
  46. "Weekly water update archive – Weekly water update – Melbourne Water". Archived from the original on 5 June 2012. Retrieved 3 May 2012.
  47. "Desalination project". Ourwater.vic.gov.au. 16 July 2012. Archived from the original on 19 February 2011. Retrieved 17 August 2012.
  48. State government eases Melbourne's water restrictions, The Age
  49. "Dam Levels".
  50. "Gold Coast Desalination Plant, Queensland - Water Technology". www.water-technology.net. Retrieved 10 April 2021.
  51. Drought over in SE Qld, ABC News, 20 May 2009
  52. "Perth Seawater Desalination Plant". Archived from the original on 5 May 2012. Retrieved 3 May 2012.
  53. Work begins on pilot desal plant Jeremy Roberts, The Australian, 21 January 2008. Retrieved 25 August 2011.
  54. Port Stanvac desalination pilot plant up and running AdelaideNow, 4 July 2008. Retrieved 25 August 2011.
  55. Acciona back to expand Adelaide desalination ABC News, 28 June 2009. Retrieved 25 August 2011.
  56. 100Gl desalination expansion in Public Works today Archived 11 June 2009 at the Wayback Machine Department of Premier & Cabinet, News release 9 June 2009. Retrieved 25 August 2011.
  57. Australian Energy Regulator (2008). State of the Energy Market: 2008. pp. 86–87.
  58. McCormick, Bill. "National Plan for Water Security". Parliament of Australia. Retrieved 29 March 2017.
  59. 1 2 Saffron Howden (27 April 2012). "It's official: Australia no longer in drought". Brisbanetimes.com.au. Retrieved 17 August 2012.
  60. "Minister declares end of drought". The Age. Melbourne.
  61. Guiney, R (Autumn 2017). "Farming suicides during the Victorian drought: 2001–2007". Australian Journal of Rural Health. 20: 11–5. doi:10.1111/j.1440-1584.2011.01244.x. PMID   22250871.