Cirrus detrainment-temperature feedback

被引:28
作者
Chou, C [1 ]
Neelin, JD
机构
[1] Univ Calif Los Angeles, Dept Atmospher Sci, Los Angeles, CA 90095 USA
[2] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
关键词
D O I
10.1029/1999GL900219
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
In considering the role of cirriform clouds in climate change, it is important to distinguish among the relationships of different high cloud types to large-scale atmospheric dynamics. While cirrostratus and cirrocumulus (CsCc) have a clear relation to deep convective sources, the ensemble behavior of cirrus is more subtle. An empirical relation is found between cirrus fraction and deep cloud top temperature that points to detrainment temperature as a dominant factor governing tropical and subtropical cirrus. This cirrus-detrainment-temperature (CDT) relation provides a target for modelers, and suggests an additional cloud-climate feedback. As surface temperatures warm, detrainment temperatures cool as deep cloud top height increases. The CDT relation implies that cirrus fraction increases. Because cirrus are optically thinner than CsCc, the competition between longwave feedbacks and cloud albedo feedbacks leads to a hypothesized positive climate feedback by cirrus fraction.
引用
收藏
页码:1295 / 1298
页数:4
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