globalchange  > 气候变化与战略
DOI: 10.5194/tc-14-3111-2020
论文题名:
A protocol for calculating basal melt rates in the ISMIP6 Antarctic ice sheet projections
作者: Jourdain N.C.; Asay-Davis X.; Hattermann T.; Straneo F.; Seroussi H.; Little C.M.; Nowicki S.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期:9
起始页码: 3111
结束页码: 3134
语种: 英语
英文关键词: annual variation ; calibration ; climate modeling ; climatology ; CMIP ; grounding line ; ice sheet ; ice shelf ; parameterization ; timescale ; Florida [United States] ; Pine Island ; United States
英文摘要: Climate model projections have previously been used to compute ice shelf basal melt rates in ice sheet models, but the strategies employed-e.g., ocean input, parameterization, calibration technique, and corrections-have varied widely and are often ad hoc. Here, a methodology is proposed for the calculation of circum-Antarctic basal melt rates for floating ice, based on climate models, that is suitable for ISMIP6, the Ice Sheet Model Intercomparison Project for CMIP6 (6th Coupled Model Intercomparison Project). The past and future evolution of ocean temperature and salinity is derived from a climate model by estimating anomalies with respect to the modern day, which are added to a present-day climatology constructed from existing observational datasets. Temperature and salinity are extrapolated to any position potentially occupied by a simulated ice shelf. A simple formulation is proposed for a basal melt parameterization in ISMIP6, constrained by the observed temperature climatology, with a quadratic dependency on either the nonlocal or local thermal forcing. Two calibration methods are proposed: (1) based on the mean Antarctic melt rate (MeanAnt) and (2) based on melt rates near Pine Island's deep grounding line (PIGL). Future Antarctic mean melt rates are an order of magnitude greater in PIGL than in MeanAnt. The PIGL calibration and the local parameterization result in more realistic melt rates near grounding lines. PIGL is also more consistent with observations of interannual melt rate variability underneath Pine Island and Dotson ice shelves. This work stresses the need for more physics and less calibration in the parameterizations and for more observations of hydrographic properties and melt rates at interannual and decadal timescales. © 2020 Copernicus GmbH. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164497
Appears in Collections:气候变化与战略

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作者单位: Univ. Grenoble Alpes/CNRS/IRD/G-INP, Ige, Grenoble, France; Los Alamos National Laboratory, Los Alamos, NM, United States; Helmholtz Centre for Polar and Marine Research, Alfred Wegener Institute, Bremerhaven, Germany; Research Department, Section for Oceans and Sea Ice, Norwegian Polar Institute, Tromsø, Norway; Scripps Institution of Oceanography, University of California San Diego, San diego, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Atmospheric and Environmental Research Inc., Lexington, MA, United States; Cryospheric Sciences Branch, Nasa Gsfc, Greenbelt, MD, United States; Department of Geology, University at Buffalo, Buffalo, NY, United States; Research and Education in ENergy, Environment and Water (RENEW) Institute, University at Buffalo, Buffalo, NY, United States

Recommended Citation:
Jourdain N.C.,Asay-Davis X.,Hattermann T.,et al. A protocol for calculating basal melt rates in the ISMIP6 Antarctic ice sheet projections[J]. Cryosphere,2020-01-01,14(9)
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