Improved Climate Simulations with Modified Convection Scheme: What’s Next? Xiaoqing Wu (ISU) and Guang Jun Zhang (SIO) Supported by DOE CCPP, ARM and NSF.

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Presentation transcript:

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

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

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

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

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

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

Variability Diagnostics for 6-Hourly Data CAM3.3 FV

Standard CAM3CAM3 with revised closure and rh=0 CAM3 with revised closure and rh=0.8CAM3 with modified ZM Variability Diagnostics for 6-Hourly Data

CAM3.3 FV isufvcam6 cam_fvz Histograms of daily precipitation rate

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

MJO cam3_3_fv_1.9x2.5 isufvcam6 cam_fvz

NCEP MJO CCSM3 with modified ZM Standard CCSM3 CCSM3.1 with modified ZM b (years 79-98)

ENSO b31.001b31.006b31.007

Standard CSM1.4CSM1.4 with modified ZM ENSO

Standard CCSM3CCSM3 with modified ZM ENSO

Deser et al. (2006, JC)