全球和东亚地区CH<sub>4</sub>浓度时空分布特征分析

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Abstract

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).

Key words： AIRS CH₄ spatial and temporal distribution seasonal change

Received: 27 April 2018

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X511

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	Articles by authors
	ZHANG Shao-hui
	XIE Bing
	ZHANG Hua
	ZHOU Xi-xun
	WANG Qiu-yan
	YANG Dong-dong

Cite this article:

ZHANG Shao-hui,XIE Bing,ZHANG Hua等. The spatial-temporal distribution of CH₄ over globe and East Asia[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(12): 4401-4408.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I12/4401

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