DOI: 10.1038/s41561-017-0018-z
论文题名: Subsurface iceberg melt key to Greenland fjord freshwater budget
作者: Moon T. ; Sutherland D.A. ; Carroll D. ; Felikson D. ; Kehrl L. ; Straneo F.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2018
卷: 11, 期: 1 起始页码: 49
结束页码: 54
语种: 英语
Scopus关键词: circulation
; fjord
; freshwater
; freshwater input
; ice sheet
; iceberg
; melting
; seasonal variation
; seawater
; spatial distribution
; subsurface flow
; temporal distribution
; water budget
; Arctic
; Greenland
; Sermilik
英文摘要: Liquid freshwater fluxes from the Greenland ice sheet affect ocean water properties and circulation on local, regional and basin-wide scales, with associated biosphere effects. The exact impact, however, depends on the volume, timing and location of freshwater releases, which are poorly known. In particular, the transformation of icebergs, which make up roughly 30-50% of the loss of the ice-sheet mass to liquid freshwater, is not well understood. Here we estimate the spatial and temporal distribution of the freshwater flux for the Helheim-Sermilik glacier-fjord system in southeast Greenland using an iceberg-melt model that resolves the subsurface iceberg melt. By estimating seasonal variations in all the freshwater sources, we confirm quantitatively that iceberg melt is the largest annual freshwater source in this system type. We also show that 68-78% of the iceberg melt is released below a depth of 20 m and, seasonally, about 40-100% of that melt is likely to remain at depth, in contrast with the usual model assumptions. Iceberg melt also peaks two months after all the other freshwater sources peak. Our methods provide a framework to assess individual freshwater sources in any tidewater system, and our results are particularly applicable to coastal regions with a high solid-ice discharge in Greenland. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105631
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; Department of Earth Sciences, University of Oregon, Eugene, OR, United States; Institute for Geophysics, University of Texas at Austin, Austin, TX, United States; Polar Science Center, Applied Physics Lab, Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Dept. of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Scripps Institution of Oceanography, University of California, San Diego, CA, United States
Recommended Citation:
Moon T.,Sutherland D.A.,Carroll D.,et al. Subsurface iceberg melt key to Greenland fjord freshwater budget[J]. Nature Geoscience,2018-01-01,11(1)