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Regional and seasonal variations of the Twomey indirect effect as observed by the ATSR-2 satellite instrument

机译:ATSR-2卫星仪器观测到的Twomey间接效应的区域和季节变化

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We use satellite observations of aerosol optical depth tau(a) and cloud effective radius r(e) from the ATSR-2 instrument in 1997 to investigate the Twomey indirect effect ( IE, -partial derivative ln r(e)/partial derivative ln tau(a)) in regions of continental outflow. We generally find a negative correlation between tau(a) and r(e), with the strongest inverse relationships downwind of Africa. North American and eastern Asian continental outflow exhibits a strong seasonal dependence, as expected. Global values for IE range from 0.10 to 0.16, consistent with theoretical predictions. Downwind of Africa, we find that the IE is unphysically high but robust ( r = -0.85) during JJA associated with high aerosol loading, and attribute this tentatively to the Twomey hypothesis accounting only for a limited number of physical properties of aerosols.
机译:我们在1997年使用ATSR-2仪器对气溶胶光学深度tau(a)和云有效半径r(e)的卫星观测结果来研究Twomey间接效应(即IE,-偏导数ln r(e)/偏导数ln tau (a))在大陆流出的地区。通常,我们发现tau(a)和r(e)之间呈负相关,而逆风关系最强的是非洲。如预期的那样,北美和东亚大陆外流表现出强烈的季节性依赖性。 IE的全局值范围从0.10到0.16,与理论预测一致。在非洲的下风处,我们发现在JJA期间与高气溶胶负荷相关的IE异常高,但很健壮(r = -0.85),并将其暂时归因于Twomey假设,该假说仅考虑了气溶胶的有限物理性质。

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