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4613.0 - Australia's Environment: Issues and Trends, Jan 2010  
Latest ISSUE Released at 11:30 AM (CANBERRA TIME) 28/01/2010   
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Contents >> Atmosphere >> Climate change

This document was added 02/05/2010.



CLIMATE CHANGE

ANNUAL AVERAGE TEMPERATURE ANOMALIES, 1910 TO 2008
Graph: Average temperature anomalies, 1910 to 2008
Note: Anomalies are based on 1961 to 1990 average of 21.8ºC.
Source: Bureau of Meteorology, 2009, Australian Climate Change and Variability, <http://reg.bom.gov.au/silo/products/cli_chg>, last viewed October 2009.


Australia experienced its 14th warmest year on record in 2008 following its 6th warmest year on record in 2007 (Endnote 1). The annual average temperature for 2008 was 0.410C above the 1961 to 1990 average. Australia’s annual average (mean) temperatures have increased by approximately 0.90C since 1910 (Endnote 1).

2008 marked Australia’s 7th consecutive warmer-than-average year. Despite this, Australia’s average temperature in 2008 was slightly lower than mean temperatures over the previous six years.

Above-average global temperatures have also been recorded in recent years. The global mean temperature for 2008 was approximately 0.31ºC above the worldwide average (for 1961 to 1990) (Endnote 1). The last year that recorded a worldwide average temperature below the global average was 1985 (Endnote 1).

Most climate scientists from the Intergovernmental Panel on Climate Change (IPCC) agree that a significant proportion of global temperature increases over the last 50 years have been caused by human-induced greenhouse gas emissions (Endnote 1).

Despite the apparent overall warming trend, Australian annual temperatures are expected to continue to vary from year-to-year (Endnote 1).

ANNUAL RAINFALL, 1900 TO 2008
Graph: Average rainfall, 1900 to 2008
Note: 1961 to 1990 annual average rainfall is 472.2 mm.
Source: Bureau of Meteorology (BoM), 2009, Australian Climate Change and Variability, <http://reg.bom.gov.au/silo/products/cli_chg>, last viewed October 2009.


The two El Niño–Southern Oscillation (ENSO) phases are El Niño and La Niña. El Niño refers to a warming of surface water over the central and eastern tropical Pacific Ocean. This sea surface temperature (SST) increase is accompanied by changes in the atmosphere measured by the Southern Oscillation Index.

ENSO cycles affect weather patterns across Australia and much of the Pacific Basin. In Australia, El Niño is often associated with reduced rainfall (Endnote 2). La Niña refers to the cooling of the waters that warm up during El Niño periods, and the associated changes in the Southern Oscillation Index. La Niña periods are often associated with increased rainfall across Australia (Endnote 3).

Rainfall across Australia in 2008 was 478.1 mm, which was only just above the long-term annual average. Above average rainfall was recorded across the Top End (of the Northern Territory), eastern Queensland, northeast New South Wales and far western areas of Western Australia.

Rainfall was below average in other parts of the country. South-eastern Australia, much of which is incorporated in the Murray-Darling Basin, received below average rainfall for the eighth consecutive year in 2008.

MURRAY-DARLING BASIN RAINFALL ANOMALIES, 1961 TO 2008
Graph: Murray-Darling Basin rainfall anomalies, 1961 to 2008
Note: 1961 to 1990 annual average rainfall is 483.2 mm.
Source: BoM, 2009, Australian Climate Change and Variability, <http://reg.bom.gov.au/silo/products/cli_chg>, last viewed December 2009.


Projections indicate that dry conditions will persist across southern Australia in the coming decades (Endnote 1). Therefore, gaining an understanding of the factors driving the long-term drought is particularly important in the context of Australia’s future climate.


ENDNOTES


1. Bureau of Meteorology, 2009; 2008; 2007, Annual Australian Climate Statement 2008; 2007; 2006, <http://www.bom.gov.au/announcements/media_releases/climate/change/>, last viewed October 2009.
2. Bureau of Meteorology, About El Niño and La Niña, <http://www.bom.gov.au/climate/enso/about-el-nino-la-nina.shtml>, last viewed October 2009.
3. Bureau of Meteorology, Climate Glossary - La Niña, <http://www.bom.gov.au/climate/glossary/lanina.shtml>, last viewed October 2009.

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