Reducing the climate shift in a new coupled model

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• 作者：Yanli Tang ; Lijuan Li ; Wenjie Dong ; Bin Wang
• 关键词：Climate drift ; CESM–GAMIL2 ; Initial shock ; Relative humidity threshold
• 刊名：Chinese Science Bulletin
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：61
• 期：6
• 页码：488-494
• 全文大小：1,951 KB
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• 作者单位：Yanli Tang (1)
  Lijuan Li (1)
  Wenjie Dong (2) (3)
  Bin Wang (1) (4)
  
  1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  2. School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, 519082, China
  3. CAS Center for Excellent in Tibetan Plateau Earth Sciences, Beijing, 100101, China
  4. Ministry of Education Key Laboratory for Earth System Modeling, Center of Earth System Science (CESS), Tsinghua University, Beijing, 100084, China
  
• 刊物主题：Science, general; Life Sciences, general; Physics, general; Chemistry/Food Science, general; Earth Sciences, general; Engineering, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-9541

文摘

Climate drift refers to spurious long-term changes that may be inherent in coupled models when external forcing factors are fixed. Understanding the sources of this drift and tuning the drift are crucial for obtaining reasonable simulations from coupled models. To prepare for the upcoming Coupled Model Intercomparison Project Phase 6, a new coupled model has been constructed based on the Community Earth System Model and the Grid-point Atmospheric Model of IAP LASG version 2. However, the surface temperature predicted by the new model is too underestimated, and this underestimation is caused by a type of climate drift, i.e., “initial shock.” This study analyzes the source of the cold surface temperature from the perspective of energy balance and attempts to reduce the surface temperature drift by tuning the relative humidity threshold for low cloud.