DOI: 10.5194/tc-11-2189-2017
Scopus记录号: 2-s2.0-85029432325
论文题名: Dynamic response of an Arctic epishelf lake to seasonal and long-term forcing: Implications for ice shelf thickness
作者: Hamilton A ; K ; , Laval B ; E ; , Mueller D ; R ; , Vincent W ; F ; , Copland L
刊名: Cryosphere
ISSN: 19940416
出版年: 2017
卷: 11, 期: 5 起始页码: 2189
结束页码: 2211
语种: 英语
英文关键词: air temperature
; annual variation
; estuarine front
; halocline
; ice lake
; ice shelf
; long-term change
; meltwater
; outflow
; seasonal variation
; Arctic
; Canada
; Canadian Arctic
英文摘要: Changes in the depth of the freshwater-seawater interface in epishelf lakes have been used to infer long-term changes in the minimum thickness of ice shelves; however, little is known about the dynamics of epishelf lakes and what other factors may influence their depth. Continuous observations collected between 2011 and 2014 in the Milne Fiord epishelf lake, in the Canadian Arctic, showed that the depth of the halocline varied seasonally by up to 3.3m, which was comparable to interannual variability. The seasonal depth variation was controlled by the magnitude of surface meltwater inflow and the hydraulics of the inferred outflow pathway, a narrow basal channel in the Milne Ice Shelf. When seasonal variation and an episodic mixing of the halocline were accounted for, long-term records of depth indicated there was no significant change in thickness of ice along the basal channel from 1983 to 2004, followed by a period of steady thinning at 0.50ma-1 between 2004 and 2011. Rapid thinning at 1.15ma-1 then occurred from 2011 to 2014, corresponding to a period of warming regional air temperatures. Continued warming is expected to lead to the breakup of the ice shelf and the imminent loss of the last known epishelf lake in the Arctic. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75501
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: Department of Civil Engineering, University of British Columbia, Vancouver, BC, Canada; Department of Geography and Environmental Studies, Carleton University, Ottawa, ON, Canada; Department of Biology and Centre for Northern Studies (CEN), Université Laval, Quebec City, QC, Canada; Department of Geography, Environment, and Geomatics, University of Ottawa, Ottawa, ON, Canada
Recommended Citation:
Hamilton A,K,, Laval B,et al. Dynamic response of an Arctic epishelf lake to seasonal and long-term forcing: Implications for ice shelf thickness[J]. Cryosphere,2017-01-01,11(5)