 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| . |  |
. |
Aerosols Impact On Australia's Climate
Canberra, Australia (SPX) Aug 20, 2008 CSIRO Marine and Atmospheric Research scientist, Dr Leon Rotstayn, says the influence aerosols have on climate is still one of the 'great unknowns' in climate science. "We recently identified that the extensive pollution haze emanating from Asia may be re-shaping rainfall patterns and monsoonal winds in northern Australia. Establishing the impacts of aerosols across the rest of the country presents a new research challenge," Dr Rotstayn says. He was speaking on the eve of 'Something in the Air', an international workshop organised by CSIRO and the Bureau of Meteorology through the Australian Climate Change Science Program and that has attracted 60 participants. At the centre of workshop discussions on August 18 and 19 will be a just-published review in the International Journal of Climatology of how aerosols could be influencing climate in Australia. Sources of human-generated aerosols include; smoke-stack emissions, vehicle emissions and vegetation burning. Natural aerosol sources include; volcanic eruptions, dust storms and ocean plankton. Dr Rotstayn says recent research suggests that the influence of aerosols on recent climate trends in the Southern Hemisphere has been comparable to greenhouse gases. "Evidence of this is found in recent CSIRO climate modelling, which shows that the Asian aerosol haze affects temperature gradients between Asia and Australia, and may have caused an increase in rainfall over north-western Australia," he says. "Global ocean circulation provides another mechanism whereby aerosol changes in the Northern Hemisphere can affect climate in the Southern Hemisphere, suggesting an urgent need for further targeted studies using coupled ocean-atmosphere global climate models. "In recent weeks, we had our first indication from CSIRO's climate model that Australian-sourced aerosols actively influence Australian climate and rainfall. Our latest simulations are much better at capturing natural rainfall variability over eastern Australia associated with the El Nino - La Nina cycle. Feedbacks due to Australian dust levels, which vary in tune with the natural El Nino cycle, appear to have improved the simulation of rainfall variability. "To better model climate variability and climate change in the Australian region, more research is needed into aerosol sources, their atmospheric distributions, and how to incorporate these processes robustly in global climate models," Dr Rotstayn said. Community Email This Article Comment On This Article Share This Article With Planet Earth
Related Links CSIRO Marine and Atmospheric Research Climate Science News - Modeling, Mitigation Adaptation
Climate Change May Boost Middle East Rainfall
Sydney, Australia (SPX) Aug 14, 2008The prospect of climate change sparking food and water shortages in the Middle East is less likely than previously thought, with new research by an Australian climate scientist suggesting that rainfall will be significantly higher in key parts of the region. |
|
|
| The content herein, unless otherwise known to be public domain, are Copyright 1995-2007 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement |
del.icio.us
Digg
Reddit
YahooMyWeb
Google
Facebook