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数学
STUDY OF OBSERVATION FOR CH_4 CONCENTRATION IN TROPOSPHERE
<正> Recently evidence shows that the global concentration of CH_4 is increasing by about 1% per year. The average worldwide tropospheric mixing ratio of CH_4 has increased from 1.52 parts per million by volume (ppmv)in January 1978 to 1. 684 ppmv in September 1988.
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Chinese Science Bulletin
1990年20期

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