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Supported by DOE CCPP, ARM and NSF

Improve d Climate Simulations with Modified Convection Scheme: What’s Next? Xiaoqing Wu (ISU) and Guang Jun Zhang (SIO). Xiaoliang Song and Liping Deng (ISU). Guido Vettoretti and W.R. Peltier (UT). Supported by DOE CCPP, ARM and NSF. Modified Zhang-McFarlane (ZM) Convection Scheme.

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Supported by DOE CCPP, ARM and NSF

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  1. Improved Climate Simulations with Modified Convection Scheme: What’s Next?Xiaoqing Wu (ISU) and Guang Jun Zhang (SIO) Xiaoliang Song and Liping Deng (ISU) Guido Vettoretti and W.R. Peltier (UT) Supported by DOE CCPP, ARM and NSF

  2. Modified Zhang-McFarlane (ZM) Convection Scheme • Revised convection closure assumption • Convection is tied to the destabilization of the tropospheric • layer above PBL by the large-scale processes • Trigger condition of deep convection • Convection is activated when the relative humidity is larger than • certain threshold, or the increase of CAPE due to the large-scale • processes exceeds certain threshold • Convective momentum transport • Convection redistributes the horizontal momentum through • the compensating subsidence, detrainment and perturbation • pressure gradient

  3. Convective Momentum Transport (CMT) Convective momentum tendency In-cloud momentum Detrainment of mass Cloud mass flux Cloud-scale pressure Fractional area of clouds Zhang and Cho (1991, JAS) Wu and Yanai (1994, JAS) Wu, Zhang and Liang (2003, GRL) Detrainment of excess momentum from clouds Convection-induced pressure gradient force Subsidence of environmental air that compensates the cloud mass flux

  4. Atmospheric Models Fully Coupled Models CCM3 Spectral CSM1.4 (T31) CAM3 Spectral CCSM3 (T31) CAM3.3 FV CCSM3.1

  5. Double ITCZ problem CSM1.4 with modified ZM CCSM3 with modified ZM

  6. CSM1.4 with modified ZM CCSM3 with modified ZM Seasonal variation

  7. Variability Diagnostics for 6-Hourly Data CAM3.3 FV

  8. Variability Diagnostics for 6-Hourly Data Standard CAM3 CAM3 with revised closure and rh=0 CAM3 with revised closure and rh=0.8 CAM3 with modified ZM

  9. Histograms of daily precipitation rate cam_fvz CAM3.3 FV isufvcam6

  10. Histograms of daily precipitation rate CAM3 with revised closure and rh=0 Standard CAM3 CAM3 with revised closure and rh=0.8 CAM3 with modified ZM

  11. cam3_3_fv_1.9x2.5 cam_fvz MJO isufvcam6

  12. NCEP MJO CCSM3.1 with modified ZM CCSM3 with modified ZM Standard CCSM3 b31.007 (years 79-98)

  13. ENSO b31.001 b31.006 b31.007

  14. Standard CSM1.4 CSM1.4 with modified ZM ENSO

  15. Standard CCSM3 CCSM3 with modified ZM ENSO

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