DOI: 10.1175/JCLI-D-18-0233.1
Scopus记录号: 2-s2.0-85060530936
论文题名: Meteorological drivers and large-scale climate forcing of West Antarctic surface melt
作者: Scott R.C. ; Nicolas J.P. ; Bromwich D.H. ; Norris J.R. ; Lubin D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 3 起始页码: 665
结束页码: 684
语种: 英语
英文关键词: Antarctica
; Atmospheric circulation
; Climate change
; Downslope winds
; ENSO
; Snowmelt/icemelt
Scopus关键词: Atmospheric pressure
; Atmospheric thermodynamics
; Glaciers
; Melting
; Sea ice
; Sea level
; Tropics
; Wind
; Antarctica
; Atmospheric circulation
; Downslope winds
; ENSO
; Snowmelt
; Climate change
英文摘要: Understanding the drivers of surface melting in West Antarctica is crucial for understanding future ice loss and global sea level rise. This study identifies atmospheric drivers of surface melt on West Antarctic ice shelves and ice sheet margins and relationships with tropical Pacific and high-latitude climate forcing using multidecadal reanalysis and satellite datasets. Physical drivers of ice melt are diagnosed by comparing satellite-observed melt patterns to anomalies of reanalysis near-surface air temperature, winds, and satellitederived cloud cover, radiative fluxes, and sea ice concentration based on an Antarctic summer synoptic climatology spanning 1979-2017. Summer warming in West Antarctica is favored by Amundsen Sea (AS) blocking activity and a negative phase of the southern annular mode (SAM), which both correlate with El Niño conditions in the tropical Pacific Ocean. Extensive melt events on the Ross-Amundsen sector of the West Antarctic Ice Sheet (WAIS) are linked to persistent, intense AS blocking anticyclones, which force intrusions of marine air over the ice sheet. Surface melting is primarily driven by enhanced downwelling longwave radiation from clouds and a warm, moist atmosphere and by turbulent mixing of sensible heat to the surface by föhn winds. Since the late 1990s, concurrent with ocean-driven WAIS mass loss, summer surface melt occurrence has increased from the Amundsen Sea Embayment to the eastern Ross Ice Shelf. We link this change to increasing anticyclonic advection of marine air into West Antarctica, amplified by increasing air-sea fluxes associated with declining sea ice concentration in the coastal Ross-Amundsen Seas. © 2019 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117231
Appears in Collections: 气候变化与战略
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Recommended Citation:
Scott R.C.,Nicolas J.P.,Bromwich D.H.,et al. Meteorological drivers and large-scale climate forcing of West Antarctic surface melt[J]. Journal of Climate,2019-01-01,32(3)