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aerocom:indirect [2013-10-03 17:12:28] steve.ghan@pnnl.gov |
aerocom:indirect [2013-10-17 07:59:15] michaels |
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+ | == Motivation == | ||
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+ | The proposed study is designed to address two key areas of uncertainty: | ||
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+ | To address issue 1), we’ve added daily and monthly diagnostics that can be compared with CloudSat and MODIS retrievals of the relationship between the aerosol optical depth and the probability of precipitation (Wang et al., 2012). | ||
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+ | To address issue 2), we’ve added experiments in which heterogeneous nucleation is neglected for T<-37C, and in which ice nucleation for T<-37C is a prescribed function of temperature (Cooper, 1986). | ||
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+ | We also have added a requirement to nudge toward analyzed winds, which we’ve found greatly reduces the noise due to natural variability without significantly inhibiting the cloud response to the aerosol. (Kooperman et al., 2012). Simulations of six years duration each should be sufficient for all experiments. | ||
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+ | To facilitate analysis and comparison before the 2013 AeroCom meeting, the results should be submitted to the AeroCom repository by August 1, 2013. Please contact steve.ghan@pnnl.gov and xiaohong.liu@pnnl.gov when your results have been submitted. | ||
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+ | Cooper, W. A.: Ice initiation in natural clouds. precipitation enhancement – a scientific challenge, Meteor. Mon., 43, 29–32, 1986. | ||
+ | Kooperman, G. J., M. S. Pritchard, S. J. Ghan, R. C. J. Sommerville, | ||
+ | Wang, M., S. Ghan, X. Liu, T. L’Ecuyer, K. Zhang, H. Morrison, M. Ovchinnikov, | ||
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< | < | ||
< | < | ||
- | < | + | < |
< | < | ||
< | < | ||
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f3d(nx,nz) cloud fraction | f3d(nx,nz) cloud fraction | ||
t3d(nx,nz) temperature | t3d(nx,nz) temperature | ||
- | phase3d(nx, | + | phase3d(nx, |
- | cdr3d(nx, | + | |
- | icr3d(nx, | + | phase3d could be from fice3d/f3d where fice3d=ice+mixed phase cloud fraction |
- | cdnc3d(nx, | + | cdr3d(nx, |
+ | icr3d(nx, | ||
+ | cdnc3d(nx, | ||
thres_cld = 0.001 \\ | thres_cld = 0.001 \\ | ||
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==== Q/A ==== | ==== Q/A ==== | ||
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