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标题：Decreasing Arctic Sea Ice Mirrors Increasing CO 2 on Decadal Time Scale
其他标题：Decreasing Arctic Sea Ice Mirrors Increasing CO 2 on Decadal Time Scale
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作者：Ola M Johannessen
期刊名称：Atmospheric and Oceanic Science Letters
印刷版ISSN：1674-2834
电子版ISSN：2376-6123
出版年度：2008
卷号：1
期号：1
页码：51-56
DOI：10.1080/16742834.2008.11446766
出版社：Taylor and Francis Ltd
摘要：Abstract Arctic sea ice is a keystone indicator of greenhouse-gas induced global climate change, which is expected to be amplified in the Arctic. Here we directly compare observed variations in arctic sea-ice extent and CO 2 since the beginning of the 20th century, identifying a strengthening linkage, such that in recent decades the rate of sea-ice decrease mirrors the increase in CO 2 , with r 2 ∼ 0.95 over the last four decades, thereby indicating that 90% ( r 2 ∼ 0.90) of the decreasing sea-ice extent is empirically “accounted for” by the increasing CO 2 in the atmosphere. The author presents an empirical relation between annual sea-ice extent and global atmospheric CO 2 concentrations, in which sea-ice reductions are linearly, inversely proportional to the magnitude of increase of CO 2 over the last few decades. This approximates sea-ice changes during the most recent four decades, with a proportionality constant of 0.030 million km 2 per ppmv CO 2 . When applied to future emission scenarios of the Intergovernmental Panel on Climate Change (IPCC), this relationship results in substantially faster ice decreases up to 2050 than predicted by IPCC models. However, departures from this projection may arise from non-linear feedback effects and/or temporary natural variations on interannual timescales, such as the record minimum of sea-ice extent observed in September 2007.
关键词：COM 2 increase ; ice decrease ; ice projection to 2050