共查询到20条相似文献,搜索用时 15 毫秒
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Appenzeller T 《Science (New York, N.Y.)》1995,268(5212):800-801
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Marshall E 《Science (New York, N.Y.)》2002,295(5560):1624-1625
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Ferretti DF Miller JB White JW Etheridge DM Lassey KR Lowe DC Macfarling Meure CM Dreier MF Trudinger CM van Ommen TD Langenfelds RL 《Science (New York, N.Y.)》2005,309(5741):1714-1717
We report a 2000-year Antarctic ice-core record of stable carbon isotope measurements in atmospheric methane (delta13CH4). Large delta13CH4 variations indicate that the methane budget varied unexpectedly during the late preindustrial Holocene (circa 0 to 1700 A.D.). During the first thousand years (0 to 1000 A.D.), delta13CH4 was at least 2 per mil enriched compared to expected values, and during the following 700 years, an about 2 per mil depletion occurred. Our modeled methane source partitioning implies that biomass burning emissions were high from 0 to 1000 A.D. but reduced by almost approximately 40% over the next 700 years. We suggest that both human activities and natural climate change influenced preindustrial biomass burning emissions and that these emissions have been previously understated in late preindustrial Holocene methane budget research. 相似文献
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Amato I 《Science (New York, N.Y.)》1991,252(5010):1252
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Wade N 《Science (New York, N.Y.)》1978,201(4351):136-140
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Enserink M 《Science (New York, N.Y.)》2002,295(5560):1624
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Normile D 《Science (New York, N.Y.)》1995,269(5229):1335-1336