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《Chinese Journal of Geophysics》 2013-08
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Structure and variation of the tropopause over China with COSMIC radio occultation bending angles

XU Xiao-Hua,GAO Pan,ZHANG Xiao-Hong* School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China  
The tropopause is the most basic structural feature of the earth atmosphere.The exchange of air mass,water vapour,trace gas and energy between the troposphere and the stratosphere occurs in the tropopause.The variation of tropopause structure is closely linked to climate change.The natural logarithm objective covariance transform method is used in this paper to identify the tropopause altitude from GPS occultation bending angle profiles.With GPS occultation observation data from the Constellation Observing System for Meteorology,Ionosphere and Climate(COSMIC) mission over the period from Jan 2007 to Dec 2011,the spatial and temporal variations of the tropopause parameters including height,temperature and pressure are analyzed over China.The area of 16°N—54°N,72°E—136°E is divided into 19×32 lattices using 2°×2° grids.The average value of height,temperature and pressure of the tropopause in each grid is calculated.The results show that the latitudinal distributions of tropopause parameter are distinct.The monthly and seasonal average value of tropopause parameters in each grid shows that the tropopause altitude and pressure have obvious seasonal variation characteristics.By using median of pairwise slopes regression method to analyze the annual average value of the tropopause parameters,it is found that the tropopause height decreases 8 m on average annually during the five years period.
【Fund】: 国家自然科学基金项目(40904002 41074024 41374036);; 国家自然科学基金创新研究群体科学基金项目(41021061);; 大地测量与地球动力学国家重点实验室开放基金项目(SKLGED2013-4-7-E)联合资助
【CateGory Index】: P421.31
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【Citations】
Chinese Journal Full-text Database 1 Hits
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