气候变化领域集成服务门户(CCPortal): Surface energy budget on Larsen and Wilkins ice shelves in the Antarctic Peninsula: Results based on reanalyses in 1989-2010

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DOI	10.5194/tc-8-1519-2014
	Surface energy budget on Larsen and Wilkins ice shelves in the Antarctic Peninsula: Results based on reanalyses in 1989-2010
	Välisuo I.; Vihma T.; King J.C.
发表日期	2014
ISSN	19940416
卷号	8 期号:4
英文摘要	Ice shelves in the Antarctic Peninsula have significantly disintegrated during recent decades. To better understand the atmospheric contribution in the process, we have analysed the inter-annual variations in radiative and turbulent surface fluxes and weather conditions over Larsen C Ice Shelf (LCIS) and Wilkins Ice Shelf (WIS) in the Antarctic Peninsula in 1989-2010. Three atmospheric reanalyses were applied: ERA-Interim by ECMWF, Climate Forecast System Reanalysis (CFSR) by NCEP, and JRA-25/JCDAS by the Japan Meteorological Agency. In addition, in situ observations from an automatic weather station (AWS) on LCIS were applied, mainly for validation of the reanalyses. The AWS observations on LCIS did not show any significant temperature trend, and the reanalyses showed warming trends only over WIS: ERA-Interim in winter (0.23 °C yrĝ̂'1) and JRA-25/JCDAS in autumn (0.13 °C yrĝ̂'1). In LCIS from December through August and in WIS from March through August, the variations of surface net flux were partly explained by the combined effects of atmospheric pressure, wind and cloud fraction. The explained variance was much higher in LCIS (up to 80%) than in WIS (26-27%). Summer melting on LCIS varied between 11 and 58 cm water equivalent (w.e.), which is comparable to previous results. The mean amount of melt days per summer on LCIS was 69. The high values of melting in summer 2001-2002 presented in previous studies on the basis of simple calculations were not supported by our study. Instead, our calculations based on ERA-Interim yielded strongest melting in summer 1992-1993 on both ice shelves. On WIS the summer melting ranged between 10 and 23 cm w.e., and the peak values coincided with the largest disintegrations of the ice shelf. The amount of melt on WIS may, however, be underestimated by ERA-Interim, as previously published satellite observations suggest that it suffers from a significant bias over WIS. © Author(s) 2014.
学科领域	air-sea interaction; climate conditions; energy budget; ice shelf; melting; seasonal variation; surface flux; Antarctic Peninsula; Antarctica; West Antarctica
语种	英语
scopus关键词	air-sea interaction; climate conditions; energy budget; ice shelf; melting; seasonal variation; surface flux; Antarctic Peninsula; Antarctica; West 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/120068
作者单位	Finnish Meteorological Institute, Helsinki, Finland; Departement of Physics, University of Helsinki, Helsinki, Finland; British Antarctic Survey, Cambridge, United Kingdom
推荐引用方式 GB/T 7714	Välisuo I.,Vihma T.,King J.C.. Surface energy budget on Larsen and Wilkins ice shelves in the Antarctic Peninsula: Results based on reanalyses in 1989-2010[J],2014,8(4).
APA	Välisuo I.,Vihma T.,&King J.C..(2014).Surface energy budget on Larsen and Wilkins ice shelves in the Antarctic Peninsula: Results based on reanalyses in 1989-2010.Cryosphere,8(4).
MLA	Välisuo I.,et al."Surface energy budget on Larsen and Wilkins ice shelves in the Antarctic Peninsula: Results based on reanalyses in 1989-2010".Cryosphere 8.4(2014).