Accelerating glacier mass loss on Franz Josef Land, Russian Arctic

REMOTE SENSING OF ENVIRONMENT

卷:211

Article

Zheng, Whyjay¹  Pritchard, Matthew E.¹  Willis, Michael J.^2,3  Tepes, Paul⁴  Gourmelen, Noel^4,5  Benham, Toby J.⁶  Dowdeswell, Julian A.⁶ 

[1] Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14850 USA

[2] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[3] Univ Colorado, Dept Geol Sci, Boulder, CO 80309 USA

[4] Univ Edinburgh, Sch Geosci, Edinburgh, Midlothian, Scotland

[5] Univ Strasbourg, UMR CNRS 7516, Inst Phys Globe Strasbourg, Strasbourg, France

[6] Univ Cambridge, Scott Polar Res Inst, Cambridge, England

关键词: Franz Josef Land;    Russian Arctic;    Cryosphere;    Climate change;    DEM;    dh/dt;    Glacier;    Ice cap;    Elevation change;    Ice loss;    ArcticDEM;    WorldView;    SPOT-5;    CryoSat-2;   

DOI  :  10.1016/j.rse.2018.04.004

来源: Elsevier

【 摘 要 】

The glaciers of the Franz Josef Land (FJL) archipelago in the Russian Arctic are subjected to rapidly-warming temperatures but are small contributors to sea level. We analyze ice surface elevation data derived from satellite stereo imagery (WorldView and SPOT), radar altimetry (CryoSat-2), and a digitized 1953 cartographic map to calculate elevation change rates (dh/dt). Mass loss from FJL doubled between 2011 and 2015 compared to 1953-2011/2015, increasing from a rate of -2.18 +/- 0.72 Gt yr(-1) to -4.43 +/- 0.78 Gt yr(-1). This 2011-2015 rate indicates an acceleration in ice loss from that observed in 2003-2009 by multiple studies using ICESat and GRACE. Glacier thinning rates are spatially highly variable. We observe glacier thinning rates of up to 10 m per year, and in general we see a trend of increased thinning from the NE towards the SW. Glacier retreat is widespread and has led to the creation of at least one new island. Historically, ice wastage from FJL is thought to have been relatively small, but accelerating ice loss may be the new normal for this archipelago in a warming Arctic.

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