DOI: 10.1175/JCLI-D-14-00271.1
Scopus记录号: 2-s2.0-84922424828
论文题名: Quantifying energy and mass fluxes controlling Godthåbsfjord freshwater input in a 5-km simulation (1991-2012)
作者: Langen P.L. ; Mottram R.H. ; Christensen J.H. ; Boberg F. ; Rodehacke C.B. ; Stendel M. ; van As D. ; Ahlstrøm A.P. ; Mortensen J. ; Rysgaard S. ; Petersen D. ; Svendsen K.H. ; Adalgeirsdóttir G. ; Cappelen J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 9 起始页码: 3694
结束页码: 3713
语种: 英语
Scopus关键词: Atmospheric pressure
; Budget control
; Glacial geology
; Glaciers
; Heat flux
; Ice
; Runoff
; Water
; Heat budgets/fluxes
; Ice sheet
; Regional model
; Surface flux
; Water budget
; Climate models
; climate modeling
; fjord
; freshwater input
; glacier
; glacier mass balance
; heat budget
; heat flux
; ice sheet
; surface flux
; water budget
; Arctic
; Godthabsfjord
; Greenland
; Greenland Ice Sheet
英文摘要: Freshwater runoff to fjords with marine-terminating glaciers along the Greenland Ice Sheet margin has an impact on fjord circulation and potentially ice sheet mass balance through increasing heat transport to the glacier front. Here, the authors use the high-resolution (5.5 km) HIRHAM5 regional climate model, allowing high detail in topography and surface types, to estimate freshwater input to Godthåbsfjord in southwest Greenland. Model output is compared to hydrometeorological observations and, while simulated daily variability in temperature and downwelling radiation shows high correlation with observations (typically >0.9), there are biases that impact the results. In particular, overestimated albedo leads to underestimation of melt and runoff at low elevations. In the model simulation (1991-2012), the ice sheet experiences increasing energy input from the surface turbulent heat flux (up to elevations of 2000 m) and shortwave radiation (at all elevations). Southerly wind anomalies and declining cloudiness due to an increase in atmospheric pressure over north Greenland contribute to increased summer melt. This results in declining surface mass balance (SMB), increasing surface runoff, and upward shift of the equilibrium line altitude. SMB is reconstructed back to 1890 though regression between simulated SMB and observed temperature and precipitation, with added uncertainty in the period 1890-1952 because of possible inhomogeneity in the precipitation record. SMB as low as in recent years appears to have occurred before, most notably around 1930, 1950, and 1960. While previous low SMBs were mainly caused by low accumulation, those around 1930 and in the 2000s are mainly due to warming. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50670
Appears in Collections: 气候变化事实与影响
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作者单位: Danish Meteorological Institute, Copenhagen, Denmark; Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland; GEUS, Geological Survey of Denmark and Greenland, Copenhagen, Denmark; Center for Earth Observation Science, CHR Faculty of Environment, Earth and Resources, University of Manitoba, Winnipeg, MB, Canada; Arctic Research Centre, Aarhus University, Aarhus, Denmark; Asiaq, Greenland Survey, Nuuk, Greenland; Institute of Earth Sciences, University of Iceland, Reykjavik, Iceland
Recommended Citation:
Langen P.L.,Mottram R.H.,Christensen J.H.,et al. Quantifying energy and mass fluxes controlling Godthåbsfjord freshwater input in a 5-km simulation (1991-2012)[J]. Journal of Climate,2015-01-01,28(9)