Studying aerosols may lead to improved climate predictions

January 17th, 2009 - 4:23 pm ICT by ANI  

Washington, Jan 17 (ANI): A NASA-led report issued by the U.S. Climate Change Science Program has determined that scientists need to study how aerosols affect climate in order to produce better predictions of Earths future climate.

Titled Atmospheric Aerosol Properties and Climate Impacts, it is the latest in a series of Climate Change Science Program reports that addresses various aspects of Americas highest priority climate research, observation and decision-support needs.

The studys authors include scientists from NASA, the National Oceanic and Atmospheric Administration and the Department of Energy.

The influence of aerosols on climate is not yet adequately taken into account in our computer predictions of climate, said Mian Chin, report coordinating lead author from NASAs Goddard Space Flight Center in Greenbelt, Maryland.

An improved representation of aerosols in climate models is essential to more accurately predict the climate changes, Chin added.
Aerosols are suspended solid or liquid particles in the air that often are visible as dust, smoke and haze.

Aerosols come from a variety of natural and human processes. On a global basis, the bulk of aerosols originate from natural sources, mainly sea salt, dust and wildfires.

Human-produced aerosols arise primarily from a variety of combustion sources. They can be the dominant form of aerosol in and downwind of highly populated and industrialized regions, and in areas of intense agricultural burning.

Although Earths atmosphere consists primarily of gases, aerosols and clouds play significant roles in shaping conditions at the surface and in the lower atmosphere.

Aerosols typically range in diameter from a few nanometers to a few tens of micrometers.

They exhibit a wide range of compositions and shapes, but aerosols between 0.05 and 10 micrometers in diameter dominate aerosols” direct interaction with sunlight.

Aerosols also can produce changes in cloud properties and precipitation, which, in turn, affect climate.

The role of greenhouse gases in global warming is fairly well established, but the degree to which the cooling effect of human-produced aerosols offsets the warming is still inadequately understood.

The report states that scientists should strive to improve their understanding of aerosols climate influences with the goal of cutting that range of uncertainty by nearly two-thirds.

According to the report, to achieve the goal of reducing uncertainties in aerosol impacts on climate, an advanced, multi-disciplinary approach that integrates surface, aircraft, and space-based measurements with models will have to be developed. (ANI)

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