期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 9, 页码 3259-3265出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL059453
关键词
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资金
- U.S. Department of Energy Office of Science (BER) Atmospheric System Research program [DE-SC0006787]
- Israeli Space Agency, Ministry of Science and Technology
- [BACCHUS FP7-603445]
- U.S. Department of Energy (DOE) [DE-SC0006787] Funding Source: U.S. Department of Energy (DOE)
The number of activated cloud condensation nuclei (CCN) into cloud drops at the base of convective clouds (N-a) is retrieved based on the high-resolution (375 m) satellite retrievals of vertical profiles of convective cloud drop effective radius (r(e)). The maximum cloud base supersaturation (S) is calculated when N-a is combined with radar-measured updraft and yields CCN(S), which was validated well against ground-based CCN measurements during the conditions of well-mixed boundary layer over the U.S. Department of Energy's Atmospheric System Research Southern Great Plains site. Satellite retrieving N-a is a new capability, which is one essential component of simultaneous measurements of cloud microstructure and CCN from space by using clouds as natural CCN chambers. This has to be complemented by a methodology for satellite estimates of cloud base updraft, which is yet to be developed and demonstrated. In the mean time, the retrieved N-a can be used for the assimilation of the combined CCN and updraft effects on clouds in models.
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