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Guang Zhang Scripps Institution of Oceanography La Jolla, California Collaborator: Houjun Wang

An Update on Testing Modifications in CAM3 Convection Parameterization: Results from Coupled Model Simulations. Guang Zhang Scripps Institution of Oceanography La Jolla, California Collaborator: Houjun Wang. What Improvements Have Been Made in CAM3?. Reduced double ITCZ bias

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Guang Zhang Scripps Institution of Oceanography La Jolla, California Collaborator: Houjun Wang

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  1. An Update on Testing Modifications in CAM3 Convection Parameterization: Results from Coupled Model Simulations Guang Zhang Scripps Institution of Oceanography La Jolla, California Collaborator: Houjun Wang

  2. What Improvements Have Been Made in CAM3? • Reduced double ITCZ bias • Increased MJO variability • Arabian Desert summer precipitation gone • Increased western Pacific summer monsoon precipitation

  3. Outline • Two 10-yr-long simulations, one for control, and one for modified convection scheme • ITCZ/SST Simulation • MJO • Global Budgets

  4. Variable CAM3_new OBS data CAM3 FLUT_CERES 235.213 238.933234.659 FLUT_ERBE 235.213 233.946 234.659 LWCF_CERES 28.588 27.129 29.634 LWCF_ERBE 28.588 30.355 29.634 PRECT_GPCP 2.817 2.607 2.827 PREH2O_NVAP 24.646 24.575 24.449 SWCF_CERES -55.862 -49.176 -54.932 SWCF_ERBE -55.862 -54.163 -54.932

  5. Variable CCSM3_new OBS data CCSM3 FLNT 232.081 238.933233.244 LWCF 29.097 27.129 29.060 PRECT_GPCP 2.731 2.607 2.782 PREH2O_NVAP 24.427 24.575 23.726 SWCF -55.186 -49.176 -54.282

  6. CAM3

  7. CCSM3

  8. Summary • Coupled simulation using CCSM3 with the modified Zhang-McFarlane scheme shows several important improvements over the standard CCSM3: Double ITCZ is mitigated; SST biases in the cold tongue and south of the equator are reduced; MJO simulation is improved similar to what was seen in CAM3. • TOA radiation balance is well maintained.

  9. http://www-cas.ucsd.edu/~zhang/ncar_diag/ccsm3rzm-ccsm3std/index.htmlhttp://www-cas.ucsd.edu/~zhang/ncar_diag/ccsm3rzm-ccsm3std/index.html

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