globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2015JD024550
论文题名:
Atmospheric drivers of Greenland surface melt revealed by self-organizing maps
作者: Mioduszewski J.R.; Rennermalm A.K.; Hammann A.; Tedesco M.; Noble E.U.; Stroeve J.C.; Mote T.L.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
语种: 英语
英文关键词: Attribution ; Energy balance ; Greenland ice sheet ; Self-organizing maps ; Synoptic climatology
英文摘要: Recent acceleration in surface melt on the Greenland ice sheet (GrIS) has occurred concurrently with a rapidly warming Arctic and has been connected to persistent, anomalous atmospheric circulation patterns over Greenland. To identify synoptic setups favoring enhanced GrIS surface melt and their decadal changes, we develop a summer Arctic synoptic climatology by employing self-organizing maps. These are applied to daily 500hPa geopotential height fields obtained from the Modern Era Retrospective Analysis for Research and Applications reanalysis, 1979-2014. Particular circulation regimes are related to meteorological conditions and GrIS surface melt estimated with outputs from the Modèle Atmosphérique Régional. Our results demonstrate that the largest positive melt anomalies occur in concert with positive height anomalies near Greenland associated with wind, temperature, and humidity patterns indicative of strong meridional transport of heat and moisture. We find an increased frequency in a 500hPa ridge over Greenland coinciding with a 63% increase in GrIS melt between the 1979-1988 and 2005-2014 periods, with 75.0% of surface melt changes attributed to thermodynamics, 17% to dynamics, and 8.0% to a combination. We also confirm that the 2007-2012 time period has the largest dynamic forcing relative of any period but also demonstrate that increased surface energy fluxes, temperature, and moisture separate from dynamic changes contributed more to melt even during this period. This implies that GrIS surface melt is likely to continue to increase in response to an ever warmer future Arctic, regardless of future atmospheric circulation patterns. ©2016. American Geophysical Union.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62932
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Center for Climatic Research University of Wisconsin-Madison Madison, Wisconsin USA; Department of Geography Rutgers, The State University of New Jersey New Brunswick, New Jersey USA; NASA Goddard Institute for Space Studies New York, New York USA; Lamont Doherty Earth Observatory of Columbia University Palisades, New York USA; National Snow and Ice Data Center Boulder, Colorado USA; Centre for Polar Observation and Modelling Pearson Building University College London London UK; Department of Geography University of Georgia Athens, Georgia USA

Recommended Citation:
Mioduszewski J.R.,Rennermalm A.K.,Hammann A.,et al. Atmospheric drivers of Greenland surface melt revealed by self-organizing maps[J]. Journal of Geophysical Research: Atmospheres,2016-01-01
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