Article

Climatic Change

, Volume 117, Issue 4, pp 829-841

First online:

Influences of external forcing changes on the summer cooling trend over East Asia

  • Bian HeAffiliated withCollege of Atmospheric Science, Nanjing University of Information Science & TechnologyLASG, Institute of Atmospheric Physics, Chinese Academy of Sciences
  • , Qing BaoAffiliated withLASG, Institute of Atmospheric Physics, Chinese Academy of Sciences Email author 
  • , Jiandong LiAffiliated withLASG, Institute of Atmospheric Physics, Chinese Academy of Sciences
  • , Guoxiong WuAffiliated withLASG, Institute of Atmospheric Physics, Chinese Academy of Sciences
  • , Yimin LiuAffiliated withLASG, Institute of Atmospheric Physics, Chinese Academy of Sciences
  • , Xiaocong WangAffiliated withLASG, Institute of Atmospheric Physics, Chinese Academy of Sciences
  • , Zhaobo SunAffiliated withCollege of Atmospheric Science, Nanjing University of Information Science & Technology

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Abstract

Observations indicate a surface cooling trend during the East Asian summer in recent decades, against a background of global warming. This cooling trend is re-examined using station data from 1951 to 2007, and atmospheric general circulation model (AGCM) simulations are performed to investigate the possible influence of changes in external forcing. The numerical experiments are designed to investigate the effects of four types of external forcing: greenhouse gases (GHGs), Total Solar Irradiance (TSI), ozone, and the direct effects of aerosols. Results indicate that external forcing contributes to the cooling trend over East Asia. Furthermore, GHGs, and to a lesser degree the direct effects of aerosols, are the main contributors to the cooling trend. The possible linkages between the external forcings and the cooling trend are discussed.