Analyzing signatures of aerosol-cloud interactions from satelliteretrievals and the GISS GCM to constrain the aerosol indirecteffect Page: 3 of 43
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MENON ET AL.: CONSTRAINING THE AEROSOL INDIRECT EFFECT X - 3
10 tus clouds; (3) Exp CN- Like Exp C but with model wind fields nudged to
1 reanalysis data. Comparison between satellite-retrieved data and model sim-
12 ulations for June to August 2002, over the Atlantic Ocean indicate the fol-
13 lowing: a negative correlation between aerosol optical thickness (AOT) and
14 cloud droplet effective radius (Reff) for all cases and satellite data, except
15 for Exp N; a weak but negative correlation between liquid water path (LWP)
16 and AOT for MODIS and CERES; and a robust increase in cloud cover with
17 AOT for both MODIS and CERES. In all simulations, there is a positive cor-
1 relation between AOT and both cloud cover and LWP (except in the case
19 of LWP-AOT for Exp CN). The largest slopes are obtained for Exp N, im-
20 plying that meteorological variability may be an important factor. The main
21 fields associated with AOT variability in NCEP/MODIS data are warmer
22 temperatures and increased subsidence for less clean cases, not well captured
23 by the model. Simulated cloud fields compared with an enhanced data prod-
24 uct from MODIS and AMSR-E indicate that model cloud thickness is over-
25 predicted and cloud droplet number is within retrieval uncertainties. Since
26 LWP fields are comparable this implies an under-prediction of Re ff and thus
27 an over-prediction of the indirect effect.
October 1, 2007, 9:31am
D R A F T
D R A F T
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Menon, S.; Del Genio, A.D.; Kaufman, Y.; Bennartz, R.; Koch, D.; Loeb, N. et al. Analyzing signatures of aerosol-cloud interactions from satelliteretrievals and the GISS GCM to constrain the aerosol indirecteffect, article, October 1, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc894465/m1/3/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.