Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics
We present a new record of ice thickness change, reconstructed at nearly 100,000 sites on the Greenland Ice Sheet (GrIS) from laser altimetry measurements spanning the period 1993-2012, partitioned into changes due to surface mass balance (SMB) and ice dynamics. We estimate a mean annual GrIS mass l...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/308353 2023-07-23T04:14:13+02:00 Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics Csatho, Beata M. Schenk, Anton F. van der Veen, Cornelis J. Babonis, Gregory Duncan, Kyle Rezvanbehbahani, Soroush van den Broeke, Michiel R. Simonsen, Sebastian B. Nagarajan, Sudhagar van Angelen, Jan H. Sub Dynamics Meteorology Marine and Atmospheric Research 2014-12-30 image/pdf https://dspace.library.uu.nl/handle/1874/308353 en eng 0027-8424 https://dspace.library.uu.nl/handle/1874/308353 info:eu-repo/semantics/OpenAccess Greenland Ice Sheet laser altimetry mass balance ice dynamics SEA-LEVEL RISE OUTLET GLACIERS MASS-LOSS JAKOBSHAVN ISBRAE ELEVATION CHANGES BALANCE EVOLUTION CLIMATE ACCELERATION ANTARCTICA Article 2014 ftunivutrecht 2023-07-02T01:14:15Z We present a new record of ice thickness change, reconstructed at nearly 100,000 sites on the Greenland Ice Sheet (GrIS) from laser altimetry measurements spanning the period 1993-2012, partitioned into changes due to surface mass balance (SMB) and ice dynamics. We estimate a mean annual GrIS mass loss of 243 +/- 18 Gt.y(-1), equivalent to 0.68 mm.y(-1) sea level rise (SLR) for 2003-2009. Dynamic thinning contributed 48%, with the largest rates occurring in 2004-2006, followed by a gradual decrease balanced by accelerating SMB loss. The spatial pattern of dynamic mass loss changed over this time as dynamic thinning rapidly decreased in southeast Greenland but slowly increased in the southwest, north, and northeast regions. Most outlet glaciers have been thinning during the last two decades, interrupted by episodes of decreasing thinning or even thickening. Dynamics of the major outlet glaciers dominated the mass loss from larger drainage basins, and simultaneous changes over distances up to 500 km are detected, indicating climate control. However, the intricate spatiotemporal pattern of dynamic thickness change suggests that, regardless of the forcing responsible for initial glacier acceleration and thinning, the response of individual glaciers is modulated by local conditions. Recent projections of dynamic contributions from the entire GrIS to SLR have been based on the extrapolation of four major outlet glaciers. Considering the observed complexity, we question how well these four glaciers represent all of Greenland's outlet glaciers. Article in Journal/Newspaper Antarc* Antarctica glacier Greenland Ice Sheet Jakobshavn Utrecht University Repository Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Greenland Ice Sheet laser altimetry mass balance ice dynamics SEA-LEVEL RISE OUTLET GLACIERS MASS-LOSS JAKOBSHAVN ISBRAE ELEVATION CHANGES BALANCE EVOLUTION CLIMATE ACCELERATION ANTARCTICA |
spellingShingle |
Greenland Ice Sheet laser altimetry mass balance ice dynamics SEA-LEVEL RISE OUTLET GLACIERS MASS-LOSS JAKOBSHAVN ISBRAE ELEVATION CHANGES BALANCE EVOLUTION CLIMATE ACCELERATION ANTARCTICA Csatho, Beata M. Schenk, Anton F. van der Veen, Cornelis J. Babonis, Gregory Duncan, Kyle Rezvanbehbahani, Soroush van den Broeke, Michiel R. Simonsen, Sebastian B. Nagarajan, Sudhagar van Angelen, Jan H. Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics |
topic_facet |
Greenland Ice Sheet laser altimetry mass balance ice dynamics SEA-LEVEL RISE OUTLET GLACIERS MASS-LOSS JAKOBSHAVN ISBRAE ELEVATION CHANGES BALANCE EVOLUTION CLIMATE ACCELERATION ANTARCTICA |
description |
We present a new record of ice thickness change, reconstructed at nearly 100,000 sites on the Greenland Ice Sheet (GrIS) from laser altimetry measurements spanning the period 1993-2012, partitioned into changes due to surface mass balance (SMB) and ice dynamics. We estimate a mean annual GrIS mass loss of 243 +/- 18 Gt.y(-1), equivalent to 0.68 mm.y(-1) sea level rise (SLR) for 2003-2009. Dynamic thinning contributed 48%, with the largest rates occurring in 2004-2006, followed by a gradual decrease balanced by accelerating SMB loss. The spatial pattern of dynamic mass loss changed over this time as dynamic thinning rapidly decreased in southeast Greenland but slowly increased in the southwest, north, and northeast regions. Most outlet glaciers have been thinning during the last two decades, interrupted by episodes of decreasing thinning or even thickening. Dynamics of the major outlet glaciers dominated the mass loss from larger drainage basins, and simultaneous changes over distances up to 500 km are detected, indicating climate control. However, the intricate spatiotemporal pattern of dynamic thickness change suggests that, regardless of the forcing responsible for initial glacier acceleration and thinning, the response of individual glaciers is modulated by local conditions. Recent projections of dynamic contributions from the entire GrIS to SLR have been based on the extrapolation of four major outlet glaciers. Considering the observed complexity, we question how well these four glaciers represent all of Greenland's outlet glaciers. |
author2 |
Sub Dynamics Meteorology Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Csatho, Beata M. Schenk, Anton F. van der Veen, Cornelis J. Babonis, Gregory Duncan, Kyle Rezvanbehbahani, Soroush van den Broeke, Michiel R. Simonsen, Sebastian B. Nagarajan, Sudhagar van Angelen, Jan H. |
author_facet |
Csatho, Beata M. Schenk, Anton F. van der Veen, Cornelis J. Babonis, Gregory Duncan, Kyle Rezvanbehbahani, Soroush van den Broeke, Michiel R. Simonsen, Sebastian B. Nagarajan, Sudhagar van Angelen, Jan H. |
author_sort |
Csatho, Beata M. |
title |
Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics |
title_short |
Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics |
title_full |
Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics |
title_fullStr |
Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics |
title_full_unstemmed |
Laser altimetry reveals complex pattern of Greenland Ice Sheet dynamics |
title_sort |
laser altimetry reveals complex pattern of greenland ice sheet dynamics |
publishDate |
2014 |
url |
https://dspace.library.uu.nl/handle/1874/308353 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica glacier Greenland Ice Sheet Jakobshavn |
genre_facet |
Antarc* Antarctica glacier Greenland Ice Sheet Jakobshavn |
op_relation |
0027-8424 https://dspace.library.uu.nl/handle/1874/308353 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772183589695258624 |