Pervasive ice sheet mass loss reflects competing ocean and atmosphere processes

被引：367

作者：

Smith, Ben ^{[1
]}

Fricker, Helen A. ^{[2
]}

Gardner, Alex S. ^{[3
]}

Medley, Brooke ^{[4
]}

Nilsson, Johan ^{[3
]}

Paolo, Fernando S. ^{[3
]}

Holschuh, Nicholas ^{[5
,6
]}

Adusumilli, Susheel ^{[2
]}

Brunt, Kelly ^{[7
]}

Csatho, Bea ^{[8
]}

Harbeck, Kaitlin ^{[9
]}

Markus, Thorsten ^{[4
]}

Neumann, Thomas ^{[4
]}

Siegfried, Matthew R. ^{[10
]}

Zwally, H. Jay ^{[4
,7
]}

机构：

[1] Univ Washington, Appl Phys Lab, Polar Sci Ctr, Seattle, WA 98105 USA

[2] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA

[3] CALTECH, Jet Prop Lab, Pasadena, CA USA

[4] NASA, Goddard Space Flight Ctr, Cryospher Sci Lab, Greenbelt, MD USA

[5] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA

[6] Amherst Coll, Dept Geol, Amherst, MA 01002 USA

[7] Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA

[8] SUNY Buffalo, Dept Geol Sci, Buffalo, NY USA

[9] KBR, Greenbelt, MD USA

[10] Colorado Sch Mines, Dept Geophys, Golden, CO 80401 USA

来源：

SCIENCE | 2020年 / 368卷 / 6496期

关键词：

ISOSTATIC-ADJUSTMENT MODEL; RELATIVE SEA-LEVEL; FIRN-DENSIFICATION; MELT RATES; GPS DATA; GREENLAND; BALANCE; SHELF; ANTARCTICA; CLIMATE;

D O I：

10.1126/science.aaz5845

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Quantifying changes in Earth's ice sheets and identifying the climate drivers are central to improving sea level projections. We provide unified estimates of grounded and floating ice mass change from 2003 to 2019 using NASA's Ice, Cloud and land Elevation Satellite (ICESat) and ICESat-2 satellite laser altimetry. Our data reveal patterns likely linked to competing climate processes: Ice loss from coastal Greenland (increased surface melt), Antarctic ice shelves (increased ocean melting), and Greenland and Antarctic outlet glaciers (dynamic response to ocean melting) was partially compensated by mass gains over ice sheet interiors (increased snow accumulation). Losses outpaced gains, with grounded-ice loss from Greenland (200 billion tonnes per year) and Antarctica (118 billion tonnes per year) contributing 14 millimeters to sea level. Mass lost from West Antarctica's ice shelves accounted for more than 30% of that region's total.

引用

页码：1239 / +

页数：35

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