Aerosol indirect effects in POLDER satellite data and the Laboratoire de Meteorologie Dynamique-Zoom (LMDZ) general circulation model -: art. no. D08205

被引:89
作者
Quaas, J [1 ]
Boucher, O
Bréon, FM
机构
[1] Univ Paris 06, CNRS, IPSL, Meteorol Dynam Lab, F-75252 Paris, France
[2] Univ Sci & Technol Lille, CNRS, UFR Phys, Opt Atmospher Lab, F-59655 Villeneuve Dascq, France
[3] CEA, CNRS, IPSL, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France
关键词
indirect effects; aerosol; clouds;
D O I
10.1029/2003JD004317
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
[1] The POLDER-1 instrument was able to measure aerosol and cloud properties for eight months in 1996 - 1997. We use these observational data for aerosol concentration ( the aerosol index), cloud optical thickness, and cloud droplet effective radius to establish statistical relationships among these parameters in order to analyze the first and second aerosol indirect effects. We also evaluate the representation of these effects as parameterized in the Laboratoire de Meteorologie Dynamique - Zoom (LMDZ) general circulation model. We find a decrease in cloud top droplet radius with increasing aerosol index in both the model and the observations. Our results are only slightly changed if the analysis is done at fixed cloud liquid water path (LWP) instead of considering all LWP conditions. We also find a positive correlation between aerosol index and cloud liquid water path, which is particularly pronounced over the Northern Hemisphere midlatitudes. This may be interpreted as observational evidence for the second aerosol indirect effect on a large scale. The model-simulated relationship agrees well with that derived from POLDER data. Model simulations show a rather small change in the two relationships if preindustrial rather than present-day aerosol distributions are used. However, when entirely switching off the second aerosol indirect effect in our model, we find a much steeper slope than we do when including it.
引用
收藏
页码:D082051 / 9
页数:9
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