A Modeling Study of the Effects of Direct Radiative Forcing
Due to Carbonaceous Aerosol on the Climate in East Asia |
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| Authors: | ZHANG Hu WANG Zhili GUO Pinwen and WANG Zaizhi |
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| Institution: | Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081;Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081;
Chinese Academy of Meteorological Sciences, Beijing 100081;The College of Atmospheric Science,
Nanjing University of Information Science and Technology, Nanjing 210044;Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081 |
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| Abstract: | The study investigated the effects of global direct radiative forcing due to carbonaceous
aerosol on the climate in East Asia, using the CAM3 developed by NCAR. The results showed that
carbonaceous aerosols cause negative forcing at the top of the atmosphere (TOA) and surface under
clear sky conditions, but positive forcing at the TOA and weak negative forcing at the surface under
all sky conditions. Hence, clouds could change the sign of the direct radiative forcing at the TOA,
and weaken the forcing at the surface. Carbonaceous aerosols have distinct effects on the summer
climate in East Asia. In southern China and India, it caused the surface temperature to increase,
but the total cloud cover and precipitation to decrease. However, the opposite effects are caused
for most of northern China and Bangladesh. Given the changes in temperature, vertical velocity,
and surface streamflow caused by carbonaceous aerosol in this simulation, carbonaceous aerosol
could also induce summer precipitation to decrease in southern China but increase in northern China. |
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| Keywords: | carbonaceous aerosol radiative forcing CAM3 climate effect in East Asia |
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