The spatial-temporal distribution of CH4 over globe and East Asia
ZHANG Shao-hui1,2, XIE Bing3, ZHANG Hua1,2, ZHOU Xi-xun2, WANG Qiu-yan1, YANG Dong-dong1
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081, China;
3. Laboratory for Climate Studies of China Meteorological Administration, National Climate Center, China Meteorological Administration, Beijing 100081, China
The spatial and temporal characteristics of CH4 concentration over globe and East Asia (70°~140°E, 10°~55°N) from December 2002 to November 2016 were analyzed based on AIRS (Atmospheric Infrared Sounder) satellite data. The results showed that the global annual mean CH4 concentration increased from 1774.2×10-9 in 2003 to 1789.1×10-9 in 2016, the growth rate was about 1.1×10-9/a. While it increased from 1811.5×10-9 to 1841.0×10-9 (the growth rate around 2.0×10-9/a) in East Asia. In middle and lower troposphere (1000~400hPa), The growth rate of CH4 concentration increased obviously over the southwestern America, southeastern Australia, southern South America, and the Tibetan Plateau and the northeastern China. However, the growth rate was negative over northeastern North America. Over northeastern North America and eastern Russia, the changes of the annual mean CH4 concentration and temperature had a positive correlation. For example, in winter, the temperature in these regions was lower than that of surrounding areas, and the CH4 concentration was lower than that of surrounding areas, too. The vertical profile of CH4 concentration was obtained by recent 10-year satellite data in this paper. The results showed that at different latitudes, the CH4 concentration gradually decreased with the increase of altitude, and the fastest decrease happened in the high latitudes. In the middle and lower troposphere of the low latitudes, the average CH4 concentration changed obviously. In the lower troposphere (850hPa), the CH4 concentration gradually increased with the increase of latitudes in the Northern Hemisphere, and decreased first and then increased in the Southern Hemisphere. In the stratosphere, the CH4 concentration was largest over the equator, and gradually decreased as the latitude increased. Additionally, there was obvious seasonal change in the distribution of CH4 concentration. In the lower troposphere, over most of the regions in the Northern Hemisphere, the average CH4 concentration was higher in summer than it in winter. However, over the Sahara Desert and Tarim Basin in China, the average CH4 concentration was higher in winter than it in summer. In winter, the CH4 concentration in the western Sichuan Province was much higher than it in the Tibetan Plateau (100×10-9~120×10-9).
张绍会, 谢冰, 张华, 周喜讯, 王秋艳, 杨冬冬. 全球和东亚地区CH4浓度时空分布特征分析[J]. 中国环境科学, 2018, 38(12): 4401-4408.
ZHANG Shao-hui, XIE Bing, ZHANG Hua, ZHOU Xi-xun, WANG Qiu-yan, YANG Dong-dong. The spatial-temporal distribution of CH4 over globe and East Asia. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(12): 4401-4408.
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