Large-Scale Forcing and Cloud–Radiation Interaction in the Tropical Deep Convective Regime

Abstract The simulations of tropical convection and thermodynamic states in response to different imposed large-scale forcing are carried out by using a cloud-resolving model and are evaluated with the Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment observation. The model is forced either with imposed large-scale vertical velocity and horizontal temperature and moisture advections (model 1) or with imposed total temperature and moisture advections (model 2). The comparison of simulations with observations shows that bias in temperature and moisture simulations by model 1 is smaller than that by model 2. This indicates that the adjustment of the mean thermodynamic stability distribution by vertical advection in model 1 is responsible for better simulations. Model 1 is used to examine effects of different parameterized solar radiative and cloud microphysical processes. A revised parameterization scheme for cloud single scattering properties in solar radiation calculations is fo...

[1]  R. Hemler,et al.  Numerical simulation of deep tropical convection associated with large-scale convergence , 1986 .

[2]  M. Chou,et al.  Estimation and Model Validation of Surface Solar Radiation and Cloud Radiative Forcing Using TOGA COARE Measurements. , 1997 .

[3]  H. D. Orville,et al.  Numerical Simulation of Ice-Phase Convective Cloud Seeding , 1980 .

[4]  Chang-Hoi Ho,et al.  Parameterizations for Cloud Overlapping and Shortwave Single-Scattering Properties for Use in General Circulation and Cloud Ensemble Models , 1998 .

[5]  C. Sui,et al.  Mechanisms of Cloud-radiation interaction in the tropics and midlatitudes , 1996 .

[6]  M. Chou,et al.  Technical report series on global modeling and data assimilation. Volume 3: An efficient thermal infrared radiation parameterization for use in general circulation models , 1994 .

[7]  Joanne Simpson,et al.  An Ice-Water Saturation Adjustment , 1989 .

[8]  Interactions of Radiation and Convection in Simulated Tropical Cloud Clusters , 1995 .

[9]  A. Slingo.  A GCM Parameterization for the Shortwave Radiative Properties of Water Clouds , 1989 .

[10]  Yukari N. Takayabu,et al.  Observation of a quasi-2-day wave during TOGA COARE , 1996 .

[11]  Thomas Hauf,et al.  Convectively forced internal gravity waves: Results from two-dimensional numerical experiments , 1986 .

[12]  W. Tao,et al.  Response of Deep Tropical Cumulus Clouds to Mesoscale Processes , 1980 .

[13]  The behaviour of a cloud ensemble in response to external forcings , 1996 .

[14]  S. Esbensen,et al.  Determination of Bulk Properties of Tropical Cloud Clusters from Large-Scale Heat and Moisture Budgets , 1973 .

[15]  David A. Randall,et al.  Explicit Simulation of Cumulus Ensembles with the GATE Phase III Data: Comparison with Observations , 1996 .

[16]  Katsuyuki V. Ooyama,et al.  Scale-Controlled Objective Analysis , 1987 .

[17]  Ka-Ming Lau,et al.  The Tropical Water and Energy Cycles in a Cumulus Ensemble Model. Part I: Equilibrium Climate , 1994 .

[18]  H. D. Orville,et al.  Bulk Parameterization of the Snow Field in a Cloud Model , 1983 .

[19]  Q. Fu.  An Accurate Parameterization of the Infrared Radiative Properties of Cirrus Clouds for Climate Models , 1996 .

[20]  Wojciech W. Grabowski,et al.  Cloud-Resolving Modeling of Tropical Cloud Systems during Phase III of GATE. Part I: Two-Dimensional Experiments. , 1996 .

[21]  Y. Ogura,et al.  Response of Tradewind Cumuli to Large-Scale Processes , 1980 .

[22]  K. Lau,et al.  Radiative–Convective Processes in Simulated Diurnal Variations ofTropical Oceanic Convection , 1998 .

[23]  K. Lau,et al.  Diurnal Variations in Tropical Oceanic Cumulus Convection during TOGA COARE , 1997 .

[24]  S. P. Anderson,et al.  Surface meteorology and air-sea fluxes in the western equatorial Pacific warm pool during the TOGA c , 1996 .

[25]  Wei-Kuo Tao,et al.  A Study of the Response of Deep Tropical Clouds to Mesoscale Processes: Three-Dimensional Numerical Experiments , 1986 .

[26]  Q. Fu,et al.  Improvements of an ice-phase microphysics parameterization for use in numerical simulations of tropical convection , 1995 .

[27]  G. Sommeria,et al.  Three-Dimensional Simulation of Turbulent Processes in an Undisturbed Trade Wind Boundary Layer , 1976 .

[28]  Peter V. Hobbs,et al.  The Mesoscale and Microscale Structure and Organization of Clouds and Precipitation in Midlatitude Cyclones. XII: A Diagnostic Modeling Study of Precipitation Development in Narrow Cold-Frontal Rainbands , 1984 .

[29]  David P. Kratz,et al.  Infrared radiation parameterizations in numerical climate models , 1991 .

[30]  B. Ferrier,et al.  Shipboard Radar Rainfall Patterns within the TOGA COARE IFA , 1997 .

[31]  W. Tao,et al.  GEWEX Cloud System Study (GCSS) Working Group 4: Precipitating Convective Cloud Systems , 1997 .

[32]  Xiaoqing Wu,et al.  Long-Term Behavior of Cloud Systems in TOGA COARE and Their Interactions with Radiative and Surface Processes. Part I: Two-Dimensional Modeling Study , 1998 .

[33]  M. Chou,et al.  A Solar Radiation Model for Use in Climate Studies , 1992 .