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Implementation of IPHOC in VVCM: Tests of GCSS Cases Anning Cheng 1,2 and Kuan-Man Xu 2 1.AS&M, Inc. 2.Science Directorate, NASA Langley Research Center.

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Presentation on theme: "Implementation of IPHOC in VVCM: Tests of GCSS Cases Anning Cheng 1,2 and Kuan-Man Xu 2 1.AS&M, Inc. 2.Science Directorate, NASA Langley Research Center."— Presentation transcript:

1 Implementation of IPHOC in VVCM: Tests of GCSS Cases Anning Cheng 1,2 and Kuan-Man Xu 2 1.AS&M, Inc. 2.Science Directorate, NASA Langley Research Center

2 Intermediately Prognostic Higher- Order Closure Model Double-Gaussian distribution of liquid-water potential temperature, total water mixing ratio and vertical velocity Skewnesses of these three third-order moments predicted All first-, second-, third- and fourth-order moments, subgrid-scale condensation and buoyancy based on the same probability distribution function A bulk microphysics scheme considering subgrid- scale variabilities has been developed and tested (Cheng and Xu 2008; in preparation)

3 Experiment Design Standard initial condition and forcing for GCSS ARM (continental shallow cumulus), BOMEX (shallow cumulus), ATEX (intermediate cloud regime) and ASTEX (stratocumulus) cases 2-D Domain; 256 km in horizontal direction; 4.5 km for ARM; 3 km for ATEX and BOMEX, and 1.5 km for ASTEX in vertical direction Resolution: 4 km in horizontal direction; 40 m for ARM, BOMEX and ATEX, and 25 m for ASTEX in vertical direction Momentum fluxes from IPHOC are not used

4 Cloud Evolution for BOMEX (%)

5 Cloud Evolution for ARM (%)

6 Mean Profile Averaged from 10h - 12h

7 Fluxes Averaged from 10h - 12h

8 Moments of w Averaged from 10h - 12h

9 Cloud Evolution for ATEX (%)

10 Mean Profile Averaged over Last Hour

11 Fluxes Averaged Over Last Hour

12 Moments of w Averaged Over Last Hour

13 Cloud Evolution for ASTEX (%)

14 Summary and Discussion An IPHOC has been implemented in VVCM and tested with major GCSS cases IPHOC is capable of simulating various PBL clouds with variable large-scale and radiative forcings using 4 km horizontal grid spacing Further improvement of the IPHOC is needed to capture the fine structure of the cloud fields simulated from benchmark LESs The LBA shallow-to-deep convective cloud transition case is under testing

15 Thank You!

16 Shallow Cumulus Clouds from the Focring of SP-CAM

17 Mean Profile Averaged over Last 40 Hour

18 Cloud Radiation Forcing

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