globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1904242116
论文题名:
Forty-six years of Greenland Ice Sheet mass balance from 1972 to 2018
作者: Mouginot J.; Rignot E.; Bjørk A.A.; van den Broeke M.; Millan R.; Morlighem M.; Noël B.; Scheuchl B.; Wood M.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:19
起始页码: 9239
结束页码: 9244
语种: 英语
英文关键词: Climate change ; Glaciers ; Glaciology ; Greenland ; Sea level
Scopus关键词: acceleration ; body weight ; climate change ; cold stress ; glacier ; Greenland ; ice sheet ; review ; sea level rise ; summer ; thickness
英文摘要: We reconstruct the mass balance of the Greenland Ice Sheet using a comprehensive survey of thickness, surface elevation, velocity, and surface mass balance (SMB) of 260 glaciers from 1972 to 2018. We calculate mass discharge, D, into the ocean directly for 107 glaciers (85% of D) and indirectly for 110 glaciers (15%) using velocity-scaled reference fluxes. The decadal mass balance switched from a mass gain of +47 ± 21 Gt/y in 1972–1980 to a loss of 51 ± 17 Gt/y in 1980–1990. The mass loss increased from 41 ± 17 Gt/y in 1990–2000, to 187 ± 17 Gt/y in 2000–2010, to 286 ± 20 Gt/y in 2010–2018, or sixfold since the 1980s, or 80 ± 6 Gt/y per decade, on average. The acceleration in mass loss switched from positive in 2000–2010 to negative in 2010–2018 due to a series of cold summers, which illustrates the difficulty of extrapolating short records into longer-term trends. Cumulated since 1972, the largest contributions to global sea level rise are from northwest (4.4 ± 0.2 mm), southeast (3.0 ± 0.3 mm), and central west (2.0 ± 0.2 mm) Greenland, with a total 13.7 ± 1.1 mm for the ice sheet. The mass loss is controlled at 66 ± 8% by glacier dynamics (9.1 mm) and 34 ± 8% by SMB (4.6 mm). Even in years of high SMB, enhanced glacier discharge has remained sufficiently high above equilibrium to maintain an annual mass loss every year since 1998. © 2019 National Academy of Sciences. 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/162085
Appears in Collections:气候变化与战略

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作者单位: Mouginot, J., Department of Earth System Science, University of California, Irvine, CA 92617, United States, Institut des Géosciences de l’Environnement, Université Grenoble Alpes, CNRS, Grenoble, 38000, France; Rignot, E., Department of Earth System Science, University of California, Irvine, CA 92617, United States, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States; Bjørk, A.A., Department of Earth System Science, University of California, Irvine, CA 92617, United States, Centre for GeoGenetics, University of Copenhagen, Copenhagen, 1350, Denmark; van den Broeke, M., Institute for Marine and Atmospheric Research Utrecht, Utrecht University, TA Utrecht, 3508, Netherlands; Millan, R., Department of Earth System Science, University of California, Irvine, CA 92617, United States; Morlighem, M., Department of Earth System Science, University of California, Irvine, CA 92617, United States; Noël, B., Institute for Marine and Atmospheric Research Utrecht, Utrecht University, TA Utrecht, 3508, Netherlands; Scheuchl, B., Department of Earth System Science, University of California, Irvine, CA 92617, United States; Wood, M., Department of Earth System Science, University of California, Irvine, CA 92617, United States

Recommended Citation:
Mouginot J.,Rignot E.,Bjørk A.A.,et al. Forty-six years of Greenland Ice Sheet mass balance from 1972 to 2018[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(19)
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