DOI: 10.5194/tc-8-1519-2014
Scopus记录号: 2-s2.0-84924962603
论文题名: Surface energy budget on Larsen and Wilkins ice shelves in the Antarctic Peninsula: Results based on reanalyses in 1989-2010
作者: Välisuo I ; , Vihma T ; , King J ; C
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 4 起始页码: 1519
结束页码: 1538
语种: 英语
英文关键词: air-sea interaction
; climate conditions
; energy budget
; ice shelf
; melting
; seasonal variation
; surface flux
; Antarctic Peninsula
; Antarctica
; West Antarctica
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74802
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Finnish Meteorological Institute, Helsinki, Finland; Departement of Physics, University of Helsinki, Helsinki, Finland; British Antarctic Survey, Cambridge, United Kingdom
Recommended Citation:
Välisuo I,, Vihma T,, King J,et al. Surface energy budget on Larsen and Wilkins ice shelves in the Antarctic Peninsula: Results based on reanalyses in 1989-2010[J]. Cryosphere,2014-01-01,8(4)