The extreme melt across the Greenland ice sheet in 2012

被引：383

作者：

Nghiem, S. V. ^{[1
]}

Hall, D. K. ^{[2
]}

Mote, T. L. ^{[3
]}

Tedesco, M. ^{[4
]}

Albert, M. R. ^{[5
]}

Keegan, K. ^{[5
]}

Shuman, C. A. ^{[6
]}

DiGirolamo, N. E. ^{[7
]}

Neumann, G. ^{[1
]}

机构：

[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Univ Georgia, Dept Geog, Athens, GA 30602 USA

[4] CUNY, Dept Earth & Atmospher Sci, New York, NY 10021 USA

[5] Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA

[6] Univ Maryland, Joint Ctr Earth Syst Technol, Baltimore, MD 21201 USA

[7] Sci Syst & Applicat Inc, Lanham, MD USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2012年 / 39卷

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

SURFACE-TEMPERATURE; DIELECTRIC-CONSTANT; CLEAR-SKY; SNOW; ACCUMULATION; RECORD; MODIS; AVHRR;

D O I：

10.1029/2012GL053611

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The discovery of the 2012 extreme melt event across almost the entire surface of the Greenland ice sheet is presented. Data from three different satellite sensors - including the Oceansat-2 scatterometer, the Moderate-resolution Imaging Spectroradiometer, and the Special Sensor Microwave Imager/Sounder - are combined to obtain composite melt maps, representing the most complete melt conditions detectable across the ice sheet. Satellite observations reveal that melt occurred at or near the surface of the Greenland ice sheet across 98.6% of its entire extent on 12 July 2012, including the usually cold polar areas at high altitudes like Summit in the dry snow facies of the ice sheet. This melt event coincided with an anomalous ridge of warm air that became stagnant over Greenland. As seen in melt occurrences from multiple ice core records at Summit reported in the published literature, such a melt event is rare with the last significant one occurring in 1889 and the next previous one around seven centuries earlier in the Medieval Warm Period. Given its rarity, the 2012 extreme melt across Greenland provides an exceptional opportunity for new studies in broad interdisciplinary geophysical research. Citation: Nghiem, S. V., D. K. Hall, T. L. Mote, M. Tedesco, M. R. Albert, K. Keegan, C. A. Shuman, N. E. DiGirolamo, and G. Neumann (2012), The extreme melt across the Greenland ice sheet in 2012, Geophys. Res. Lett., 39, L20502, doi:10.1029/2012GL053611.

引用

页数：6

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