The Response of the East Asian Summer Monsoon to Strong Tropical Volcanic Eruptions  

作　　者：CUI Xuedong GAO Yongqi SUN Jianqi 

机构地区：[1]Nansen-Zhu International Research Centre, Institute of Atmospheric Physics,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]Nansen Environmental and Remote Sensing Center Bergen [4]Bjerknes Center for Climate Research, University of Bergen

出　　处：《Advances in Atmospheric Sciences》2014年第6期1245-1255,共11页大气科学进展（英文版）

基　　金：supported by the Strategic Priority Research Program(Grant No.XDA05110203) of the Chinese Academy of Sciences;the Research Council of Norway through the India-Clim project;the National Basic Research Program of China(Grant Nos.2012CB955401 and 2010CB951802)

摘　　要：A 600-year integration performed with the Bergen Climate Model and National Centers for Environmental Prediction/National Center for Atmospheric Research （NCEP/NCAR） reanalysis data were used to investigate the impact of strong tropical volcanic eruptions on the East Asian summer monsoon （EASM） and EASM rainfall.Both the simulation and NCEP/NCAR reanalysis data show a weakening of the EASM in strong eruption years.The model simulation suggests that North and South China experience droughts and the Yangtze-Huaihe River Valley experiences floods during eruption years.In response to strong tropical volcanic eruptions,the meridional air temperature gradient in the upper troposphere is enhanced,which leads to a southward shift and an increase of the East Asian subtropical westerly jet stream （EASWJ）.At the same time,the land-sea thermal contrast between the Asian land mass and Northwest Pacific Ocean is weakened.The southward shift and increase of the EASWJ and reduction of the land-sea thermal contrast all contribute to a weakening of the EASM and EASM rainfall anomaly.A 600-year integration performed with the Bergen Climate Model and National Centers for Environmental Prediction/National Center for Atmospheric Research （NCEP/NCAR） reanalysis data were used to investigate the impact of strong tropical volcanic eruptions on the East Asian summer monsoon （EASM） and EASM rainfall.Both the simulation and NCEP/NCAR reanalysis data show a weakening of the EASM in strong eruption years.The model simulation suggests that North and South China experience droughts and the Yangtze-Huaihe River Valley experiences floods during eruption years.In response to strong tropical volcanic eruptions,the meridional air temperature gradient in the upper troposphere is enhanced,which leads to a southward shift and an increase of the East Asian subtropical westerly jet stream （EASWJ）.At the same time,the land-sea thermal contrast between the Asian land mass and Northwest Pacific Ocean is weakened.The southward shift and increase of the EASWJ and reduction of the land-sea thermal contrast all contribute to a weakening of the EASM and EASM rainfall anomaly.

关 键 词：East Asian summer monsoon volcanic eruption East Asian subtropical westerly jet stream land-sea thermal contrast 

分 类 号：P317[天文地球—固体地球物理学] P461[天文地球—地球物理学]