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《Environmental Science & Technology》 2017-01
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Temporal and Spatial Distribution Character of CH_4 Near Surface and Upper Air in China

CHANG Yue;DENG Xiaobo;LIU Hailei;DING Jilie;WU Hao;Key Laboratory of Atmospheric Sounding, Chengdu University of Information Technology;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology;Chinese Global Atmosphere Watch Baseline Observatory;  
GOSAT is the first earth observing satellite to measure the greenhouse gases throughout the world.It's equipped with thermal and near-infrared sensor(TANSO)for carbon observation.The paper employs the government retrieval dataproduct of the methane density in the level 4B and collects data near surface-975 hPa and upper air 400 hPa,250 hPa during July 2009 and May 2012.The irrelevant data is deleted after comparing and verifying the data between Chinese global atmosphere base observatory site(Waliguan site) and the GOSAT.Temporal and spatial characteristics of the methane density near surface and in the upper air are analyzed.Analyses are also made concerning changes and growth rate in the troposphere of China and at Waliguan site during July 2009 and May 2012.The data from Waliguan site and the TCCON global methane measuring sites is also compared.The results indicate that the vertical distribution of the methane decreases as the altitude increases in China.The methane is mainly distributed in North China,and reaches its highest level in spring and summer.The methane density distributes in the middle and high level tends to rise but displays a decline trend at Waliguan site.
【Fund】: 国家自然科学基金项目资助(41375042 41475032)
【CateGory Index】: X16
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【Citations】
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