Temperature Dependence of Low Cloud Optical Thickness in the GISS GCM: Contributing Mechanisms and Climate Implications
Temperature Dependence of Low Cloud Optical Thickness in the GISS GCM: Contributing Mechanisms and Climate Implications
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GISS GCM 中低云光学厚度的温度依赖性：贡献机制和气候影响
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Yao
中科院分区：
文献类型：
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作者：
G. Tselioudis;A. Delgenio;William Kovari;M. Yao
摘要：本文分析了Goddard Institute for Space Studies (GISS) GCM的当前气候模拟，其中包括依赖于预测云含水量的交互云光学特性，以记录模式大气中低云光学厚度随温度的变化。在温暖的亚热带和热带地区，低云光学厚度随温度的升高而减小，而在寒冷的中纬度地区，低云光学厚度随温度的升高而增大。这种行为与两项观测研究的结果一致，这两项研究分析了来自国际卫星云气候学项目和特殊传感器微波/成像仪数据集的卫星数据。中纬度地区低云光学厚度随温度的增加是由于垂直范围和云水的增加，而暖纬地区低云光学厚度随温度的减少是由于云水含量的减少，尽管云的垂直范围增加，但仍然发生。云处理这些数据……
Abstract A current-climate simulation of the Goddard Institute for Space Studies (GISS) GCM, which includes interactive cloud optical properties that depend on the predicted cloud water content, is analyzed to document the variations of low cloud optical thickness with temperature in the model atmosphere. It is found that low cloud optical thickness decreases with temperature in the warm subtropical and tropical latitudes and increases with temperature in the cold midlatitude regions. This behavior is in agreement with the results of two observational studies that analyzed satellite data from the International Satellite Cloud Climatology Project and Special Sensor Microwave/Imager datasets. The increase of low cloud optical thickness with temperature in the midlatitudes is due to vertical extent and cloud water increases, whereas the decrease with temperature in the warm latitudes is due to decreases in cloud water content and happens despite increases in cloud vertical extent. The cloud processes that pr...