Advances in Atmospheric Sciences

, Volume 28, Issue 1, pp 80–98 | Cite as

Water vapor and cloud radiative forcings over the Pacific Ocean simulated by the LASG/IAP AGCM: Sensitivity to convection schemes

  • Chunqiang Wu (吴春强)
  • Tianjun Zhou (周天军)
  • De-Zheng Sun (孙德征)
  • Qing Bao (包 庆)
Article

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 Niño 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 Niño 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 Niño 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.

Key words

SAMIL convection scheme cloud radiative forcing greenhouse effect 

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Copyright information

© Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Chunqiang Wu (吴春强)
    • 1
    • 2
  • Tianjun Zhou (周天军)
    • 1
  • De-Zheng Sun (孙德征)
    • 3
  • Qing Bao (包 庆)
    • 1
  1. 1.The State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.National Satellite Meteorological CenterChina Meteorological AdministrationBeijingChina
  3. 3.Cooperative Institute for Environmental Studies/University of Colorado & Earth System Research Laboratory/NOAABoulderUSA

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