RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2012, Vol. 21 >> Issue (02): 204-.

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VARIATION CHARACTERISTICS OF ATMOSPHERIC CH4 CONCENTRATION AT LIN’AN REGIONAL BACKGROUND STATION

XU Honghui1|PU Jingjiao1|GU Junqiang1|YU Xiangming2   

  1. (1.Zhejiang Institute of Meteorological Sciences,Hangzhou 310017,China|2.Lin’an Regional Background Station,Lin’an 311307,China
  • Online:2012-02-20

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Abstract:

Characteristics of atmospheric CH4 concentration obtained by Flask measurements were analyzed at Lin'an regional background station from August 2006 to July 2009.According to the wind direction,backward trajectories and emission inventory,the variation characteristics of CH4 concentration was studied and the impact of emission sources on CH4 concentration was evaluated in Yangtze River Delta.The results revealed that atmospheric CH4 concentrations at Lin'an regional background station were between 1 7584×10-9 and 19700×10-9.The CH4 concentration varied as seasons change and the annual difference was about 737×10-9.The longterm trend of CH4 concentration showed rapid growth year by year;the average growth rate was about 176×10-9/a.The CH4 concentrations were high when the winds were from the northeast and southeast,and the CH4 concentrations were low when the winds were from southwest.The air mass contained high CH4 concentrations mainly came from the northeast and east sector while the air mass contained low CH4 concentrations almost came from the southwest and south sector

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