文档介绍：Air Pollution as a Climate Forcing
C. S. Kiang (江家驷)
(朱彤)
College of Environmental Sciences
Peking University,
Air Pollution as a Climate Forcing: A Workshop
Honolulu, Hawaii
April 29 – May 3, 2002
Edited by James E. Hansen
It has been suggested that climate forcing associated with air pollution, specifically tropospheric ozone (O3), black carbon (BC) aerosols, and methane (CH4) together represent a greater climate forcing than the forcing by CO2.
(Hansen, J., et al., Proc. Natl. Acad. Sci. 97, 9875-9880, 2000; 98, 14778-14783, 2001; Clim. Change 52, 435-440, 2002)
A. Can we decrease BC aerosols enough to alleviate the global warming “bounce” that will pany “clear sky” initiatives that are expected to reduce reflecting aerosols in places such as the United States and China?
B. Are aerosols responsible for important regional climate anomalies, for example, the increasing tendency for droughts in northern China, Afghanistan and other places?
Two questions:
PRD regional air pollution seasonal MODIS satellite images
Pilot Study 2002-2004 The seven sampling stations in the Pearl River Delta
Monthly averages:
-- OC and sulfate ponents
-- Highest concentrations seen on mainland
Preliminary Results (October Samples)
Guangzhou mg/m3 Shenzhen mg/m3 Zhongshan mg/m3 Conghua mg/m3
Hongkong mg/m3 Tung Chung mg/m3 Tap Mun mg/m3
Most severe air pollution event on record in Hong Kong
On November 2, 2003
At 2:15 pm
RSP = 342 ug/m3
FSP = 295 ug/m3
Preliminary Results (October Samples)
Also Ozone Episode Day
Note: Uniform nature of PM at 3 HK sites
Implication: PM HK not produced from local emissions
Hi’est PM in HK observed on ozone episode day