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中国中东部地区硫酸盐气溶胶直接辐射强迫及气候效应的数值模拟
Simulation of Forcing of Sulfate Aerosol on Direct Radiation and Its Climate Effect over Middle and Eastern China
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摘要: 分析了MODIS卫星资料反演的2001年我国中东部地区气溶胶光学厚度的时空分布特征，并利用中尺度数值模式MM5对该地区硫酸盐气溶胶的直接辐射强迫及其气候效应进行了模拟。结果表明：2001年四川盆地、长江中下游地区、黄淮一带及两广等地区气溶胶光学厚度较大。各季光学厚度变化不同，全年以春季最大。地面温度响应呈现出明显的区域季节变化特征，主要表现为冬、春、秋季南方降温幅度明显，夏季北方降温幅度明显。就区域平均而言，2001年中东部地区晴空时气溶胶辐射强迫以春季最大，达-34.53 W/m2；夏季次之，达-22.76 W/m2；冬季再次，达-22.57 W/m2；秋季最小，达-20 W/m2。地面降温则以冬季最大，达-0.65℃；秋季次之，达-0.37 ℃；春季再次，达-0.34 ℃；夏季最小，达-0.09 ℃。Abstract: Investigation is performed of the space/time features of MODIS data retrieved aerosol optical thickness in the east and middle of China in 2001 and MM5 simulation is conducted of the forcing of sulphate aerosol on direct radiation and its climate effect. Evidence shows that optical thickness is greater in the Sichuan Basin, middle-lower reaches of the Yangtze, Huanghe-Huaihe valley, Guangdong and Guangxi and varies on a seasonal basis, with its maximum in spring. The response of surface temperature to forcing exhibits distinct features on a regional and seasonal basis, with marked temperature drop in the south (north) of the target area in winter, spring and autumn (summer); in terms of regional mean, the forcing is –34.53, –22.76, –22.56 and –20 W/m2 in spring, winter and autumn, in order under a clear sky for the eastern and middle part and in terms of the drop in surface temperature the study region shows –0.65, –0.37, –0.34 and –0.09oC in winter, autumn, spring and summer, respectively.
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Key words:
- Aerosol;
- MODIS;
- Sulfate;
- Radiat ion forcing;
- Climate effects
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表 1 晴空气溶胶辐射强迫和地面气温变化的大小
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