DOI: 10.5194/tc-12-453-2018
Scopus记录号: 2-s2.0-85041951026
论文题名: Tidal influences on a future evolution of the Filchner-Ronne Ice Shelf cavity in the Weddell Sea, Antarctica
作者: Mueller R ; D ; , Hattermann T ; , Howard S ; L ; , Padman L
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 2 起始页码: 453
结束页码: 476
语种: 英语
英文关键词: basal melting
; ice drift
; inflow
; meltwater
; oceanic circulation
; spatial distribution
; thermodynamic property
; thermodynamics
; tidal current
; water column
; Antarctica
; Filchner-Ronne Ice Shelf
; Ronne Ice Shelf
; Southern Ocean
; Weddell Sea
; West Antarctica
英文摘要: Recent modeling studies of ocean circulation in the southern Weddell Sea, Antarctica, project an increase over this century of ocean heat into the cavity beneath Filchner-Ronne Ice Shelf (FRIS). This increase in ocean heat would lead to more basal melting and a modification of the FRIS ice draft. The corresponding change in cavity shape will affect advective pathways and the spatial distribution of tidal currents, which play important roles in basal melting under FRIS. These feedbacks between heat flux, basal melting, and tides will affect the evolution of FRIS under the influence of a changing climate. We explore these feedbacks with a three-dimensional ocean model of the southern Weddell Sea that is forced by thermodynamic exchange beneath the ice shelf and tides along the open boundaries. Our results show regionally dependent feedbacks that, in some areas, substantially modify the melt rates near the grounding lines of buttressed ice streams that flow into FRIS. These feedbacks are introduced by variations in meltwater production as well as the circulation of this meltwater within the FRIS cavity; they are influenced locally by sensitivity of tidal currents to water column thickness (wct) and non-locally by changes in circulation pathways that transport an integrated history of mixing and meltwater entrainment along flow paths. Our results highlight the importance of including explicit tidal forcing in models of future mass loss from FRIS and from the adjacent grounded ice sheet as individual ice-stream grounding zones experience different responses to warming of the ocean inflow. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75427
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
作者单位: Earth and Space Research, Bellingham, WA, United States; Akvaplan-niva, Tromsø, Norway; Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Earth and Space Research, Seattle, WA, United States; Earth and Space Research, Corvallis, OR, United States
Recommended Citation:
Mueller R,D,, Hattermann T,et al. Tidal influences on a future evolution of the Filchner-Ronne Ice Shelf cavity in the Weddell Sea, Antarctica[J]. Cryosphere,2018-01-01,12(2)