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DOI	10.5194/tc-8-1289-2014
	A spurious jump in the satellite record: Has Antarctic sea ice expansion been overestimated?
	Eisenman I.; Meier W.N.; Norris J.R.
发表日期	2014
ISSN	19940416
卷号	8 期号:4
英文摘要	Recent estimates indicate that the Antarctic sea ice cover is expanding at a statistically significant rate with a magnitude one-third as large as the rapid rate of sea ice retreat in the Arctic. However, during the mid-2000s, with several fewer years in the observational record, the trend in Antarctic sea ice extent was reported to be considerably smaller and statistically indistinguishable from zero. Here, we show that much of the increase in the reported trend occurred due to the previously undocumented effect of a change in the way the satellite sea ice observations are processed for the widely used Bootstrap algorithm data set, rather than a physical increase in the rate of ice advance. Specifically, we find that a change in the intercalibration across a 1991 sensor transition when the data set was reprocessed in 2007 caused a substantial change in the long-term trend. Although our analysis does not definitively identify whether this change introduced an error or removed one, the resulting difference in the trends suggests that a substantial error exists in either the current data set or the version that was used prior to the mid-2000s, and numerous studies that have relied on these observations should be reexamined to determine the sensitivity of their results to this change in the data set. Furthermore, a number of recent studies have investigated physical mechanisms for the observed expansion of the Antarctic sea ice cover. The results of this analysis raise the possibility that much of this expansion may be a spurious artifact of an error in the processing of the satellite observations. © Author(s) 2014.
学科领域	algorithm; data set; ice cover; satellite data; satellite imagery; sea ice; sensitivity analysis; Antarctica
语种	英语
scopus关键词	algorithm; data set; ice cover; satellite data; satellite imagery; sea ice; sensitivity analysis; Antarctica
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120083
作者单位	Scripps Institution of Oceanography, University of California at San Diego, San Diego, CA, United States; NASA, Goddard Space Flight Center, Greenbelt, MD, United States
推荐引用方式 GB/T 7714	Eisenman I.,Meier W.N.,Norris J.R.. A spurious jump in the satellite record: Has Antarctic sea ice expansion been overestimated?[J],2014,8(4).
APA	Eisenman I.,Meier W.N.,&Norris J.R..(2014).A spurious jump in the satellite record: Has Antarctic sea ice expansion been overestimated?.Cryosphere,8(4).
MLA	Eisenman I.,et al."A spurious jump in the satellite record: Has Antarctic sea ice expansion been overestimated?".Cryosphere 8.4(2014).