| Water Vapor and Cloud Radiative Forcings over the Pacific Ocean Simulated by the LASG/IAP AGCM:Sensitivity to Convection Schemes |
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| 作者姓名： | WU Chunqiang ZHOU Tianjun SUN De-Zheng BAO Qing |
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| 作者单位： | 中国科学院大气物理研究所,,, |
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| 基金项目： | The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan),The National Basic Research Program of China (973 Program) |
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| 摘 要： | Characteristics of the total clear-sky greenhouse effect (GA) and cloud radiative forcings (CRFs), along with the radiative-related water vapor and cloud properties simulated by the Spectral Atmospheric Model developed by LASGIAP (SAMIL) are evaluated. Impacts of the convection scheme on the simulation of CRFs are discussed by using two AMIP (Atmospheric Model Inter-comparison Project) type simulations employing different convection schemes: the new Zhang-McFarlane (NZH) and Tiedtke (TDK) convection schemes. It shows that both the climatological GA and its response to El Nio warming are simulated well, both in terms of spatial pattern and magnitude. The impact of the convection scheme on GA is not significant. The climatological longwave CRF (LWCRF) and its response to El Nio warming are simulated well, but with a prominently weaker magnitude. The simulation of the climatology (response) of LWCRF in the NZH (TDK) run is slightly more realistic than in the TDK (NZH) simulation, indicating significant impacts of the convection scheme. The shortwave CRF (SWCRF) shows large biases in both spatial pattern and magnitude, and the results from the TDK run are better than those from the NZH run. A spuriously excessive negative climatological SWCRF over the southeastern Pacific and an insufficient response of SWCRF to El Nio warming over the tropical Pacific are seen in the NZH run. These two biases are alleviated in the TDK run, since it produces vigorous convection, which is related to the low threshold for convection to take place. Also, impacts of the convection scheme on the cloud profile are discussed.
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| 关 键 词： | SAMIL convection scheme cloud radiative forcing greenhouse effect |
| 收稿时间： | 21 June 2004 |
Water Vapor and Cloud Radiative Forcings over the Pacific Ocean Simulated by the LASG/IAP AGCM: Sensitivity to Convection Schemes |
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| WU Chunqiang,ZHOU Tianjun,SUN De-Zheng,BAO Qing.Water Vapor and Cloud Radiative Forcings over the Pacific Ocean Simulated by the LASG/IAP AGCM:Sensitivity to Convection Schemes[J].Advances in Atmospheric Sciences,2011,28(1):80-98. |
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| Authors: | WU Chunqiang ZHOU Tianjun SUN De-Zheng and BAO Qing |
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| Institution: | The State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,The State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Cooperative Institute for Environmental Studies/University of Colorado & Earth System Research Laboratory/NOAA, Boulder, Colorado, USA,The State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Characteristics of the total clear-sky greenhouse effect (GA) and cloud
radiative forcings (CRFs), along with the radiative-related water vapor and
cloud properties simulated by the Spectral Atmospheric Model developed by
LASG/IAP (SAMIL) are evaluated. Impacts of the convection scheme on the
simulation of CRFs are discussed by using two AMIP (Atmospheric Model
Inter-comparison Project) type simulations employing different convection
schemes: the new Zhang--McFarlane (NZH) and Tiedtke (TDK) convection
schemes. It shows that both the climatological GA and its response to El
Nino warming are simulated well, both in terms of spatial pattern and
magnitude. The impact of the convection scheme on GA is not significant. The
climatological longwave CRF (LWCRF) and its response to El Nino warming
are simulated well, but with a prominently weaker magnitude. The simulation
of the climatology (response) of LWCRF in the NZH (TDK) run is slightly more
realistic than in the TDK (NZH) simulation, indicating significant impacts
of the convection scheme. The shortwave CRF (SWCRF) shows large biases in
both spatial pattern and magnitude, and the results from the TDK run are
better than those from the NZH run. A spuriously excessive negative climatological SWCRF over the southeastern Pacific and an insufficient response of SWCRF to El Nino warming over the tropical Pacific are seen in the NZH run. These two biases are alleviated in the TDK run, since it produces vigorous
convection, which is related to the low threshold for convection to take
place. Also, impacts of the convection scheme on the cloud profile are iscussed. |
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| Keywords: | SAMIL convection scheme cloud radiative forcing greenhouse effect |
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