Gaps and Limitations in Atmospheric Modeling of the Water Cycle
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Gaps and Limitations in Atmospheric
Modeling of the Water Cycle
Minghua Zhang
Stony Brook University, SUNY
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1. The Scales
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The Dynamics
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(Williamson 2006) (Nastrom and Gage 1985)
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SMET CAM4
Rainfall Frequency at ARM TWP
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(Lombardo et al. 2012)
12 UTC July 23, 2002 21 UTC July 23, 2002
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Radar WRF (2km)
(Lombardo et al. 2012)
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(Lombardo et al. 2012)
Precipitation mixing ratio
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1. The range of spatial and time scales of precipitation
far exceeds what current models can describe.
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Two possible approaches:
Parameterization: unproven, and unlikely succeed
High resolution: how high?
Yet, features at these scales are important to the water
cycle.
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2. The Processes
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00 UTC December 14, 2001
(Colle et al 2008)
WRF (24 hr)NCEP
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SUNYSBMicrophysics
ThompsonMicrophysics
Mixing Ratio ofCloud liquidCloud IcePrecipitation
(Colle et al 2008)
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2. Some of the key processes are still not
characterized.
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The requirements:
More comprehensive observations
Knowledge on the asymptote of these processes
Yet, these processes are important to the water
cycle.