DOI: 10.1175/JCLI-D-16-0420.1
Scopus记录号: 2-s2.0-85017798360
论文题名: The fate of the Southern Weddell sea continental shelf in a warming climate
作者: Hellmer H.H. ; Kauker F. ; Timmermann R. ; Hattermann T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 12 起始页码: 4337
结束页码: 4350
语种: 英语
Scopus关键词: Carbon dioxide
; Feedback
; Melting
; Oceanography
; Antarctica
; Coupled models
; Freshwater
; Regional model
; Southern ocean
; Thermocline circulation
; Ice
; atmospheric forcing
; climate change
; continental shelf
; freshwater
; ice sheet
; ice shelf
; oceanic circulation
; open ocean
; thermocline
; warming
; Amundsen Sea
; Bellingshausen Sea
; Southern Ocean
; Weddell Sea
英文摘要: Warm water of open ocean origin on the continental shelf of the Amundsen and Bellingshausen Seas causes the highest basal melt rates reported for Antarctic ice shelves with severe consequences for the ice shelf/ice sheet dynamics. Ice shelves fringing the broad continental shelf in the Weddell and Ross Seas melt at rates orders of magnitude smaller. However, simulations using coupled ice-ocean models forced with the atmospheric output of the HadCM3 SRES-A1B scenario run (CO2 concentration in the atmosphere reaches 700 ppmv by the year 2100 and stays at that level for an additional 100 years) show that the circulation in the southern Weddell Sea changes during the twenty-first century. Derivatives of Circumpolar Deep Water are directed southward underneath the Filchner-Ronne Ice Shelf, warming the cavity and dramatically increasing basal melting. To find out whether the open ocean will always continue to power the melting, the authors extend their simulations, applying twentieth-century atmospheric forcing, both alone and together with prescribed basal mass flux at the end of (or during) the SRES-A1B scenario run. The results identify a tipping point in the southern Weddell Sea: once warm water flushes the ice shelf cavity a positive meltwater feedback enhances the shelf circulation and the onshore transport of open ocean heat. The process is irreversible with a recurrence to twentieth-century atmospheric forcing and can only be halted through prescribing a return to twentieth-century basal melt rates. This finding might have strong implications for the stability of the Antarctic ice sheet. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48874
Appears in Collections: 气候变化与战略
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作者单位: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, OASys, Hamburg, Germany
Recommended Citation:
Hellmer H.H.,Kauker F.,Timmermann R.,et al. The fate of the Southern Weddell sea continental shelf in a warming climate[J]. Journal of Climate,2017-01-01,30(12)