DOI: 10.1007/s00382-017-3980-7
Scopus记录号: 2-s2.0-85032831148
论文题名: Climate response to the meltwater runoff from Greenland ice sheet: evolving sensitivity to discharging locations
作者: Liu Y. ; Hallberg R. ; Sergienko O. ; Samuels B.L. ; Harrison M. ; Oppenheimer M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 51, 期: 2018-05-06 起始页码: 1733
结束页码: 1751
语种: 英语
英文关键词: Atlantic meridional ocean circulation (AMOC)
; Climate change
; Freshwater forcing
; Greenland ice sheet
; Hosing experiment
Scopus关键词: climate change
; climate effect
; deep water formation
; discharge
; hydrological response
; ice sheet
; meltwater
; meridional circulation
; runoff
; Arctic
; Atlantic Ocean
; Atlantic Ocean (North)
; Greenland
; Greenland Ice Sheet
英文摘要: Greenland Ice Sheet (GIS) might have lost a large amount of its volume during the last interglacial and may do so again in the future due to climate warming. In this study, we test whether the climate response to the glacial meltwater is sensitive to its discharging location. Two fully coupled atmosphere–ocean general circulation models, CM2G and CM2M, which have completely different ocean components are employed to do the test. In each experiment, a prescribed freshwater flux of 0.1 Sv is discharged from one of the four locations around Greenland—Petermann, 79 North, Jacobshavn and Helheim glaciers. The results from both models show that the AMOC weakens more when the freshwater is discharged from the northern GIS (Petermann and 79 North) than when it is discharged from the southern GIS (Jacobshavn and Helheim), by 15% (CM2G) and 31% (CM2M) averaged over model year 50–300 (CM2G) and 70–300 (CM2M), respectively. This is due to easier access of the freshwater from northern GIS to the deepwater formation site in the Nordic Seas. In the long term (> 300 year), however, the AMOC change is nearly the same for freshwater discharged from any location of the GIS. The East Greenland current accelerates with time and eventually becomes significantly faster when the freshwater is discharged from the north than from the south. Therefore, freshwater from the north is transported efficiently towards the south first and then circulates back to the Nordic Seas, making its impact to the deepwater formation there similar to the freshwater discharged from the south. The results indicate that the details of the location of meltwater discharge matter if the short-term (< 300 years) climate response is concerned, but may not be critical if the long-term (> 300 years) climate response is focused upon. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109133
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Atmospheric and Oceanic Sciences, School of Physics, Peking Univeristy, Chengfu Road No. 209, Haidian, Beijing, 100871, China; NOAA Geophysical Fluid Dynamics Laboratory, Ocean Group, 201 Forrestal Rd., Princeton, NJ 08540, United States; Program in Atmospheric and Oceanic Sciences, Princeton University, 201 Forrestal Road, Princeton, NJ 08540, United States; Woodrow Wilson School of Public and International Affairs, Princeton University, Princeton, NJ 08540, United States; Department of Geosciences, Princeton University, Princeton, NJ 08540, United States
Recommended Citation:
Liu Y.,Hallberg R.,Sergienko O.,et al. Climate response to the meltwater runoff from Greenland ice sheet: evolving sensitivity to discharging locations[J]. Climate Dynamics,2018-01-01,51(2018-05-06)