Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland
ABSTRACT We assess ice loss and velocity changes between 1985 and 2014 of three tidewater and five-land terminating glaciers in Godthåbsfjord (Nuup Kangerlua), Greenland. Glacier thinning accounted for 43.8 ± 0.2 km 3 of ice loss, equivalent to 0.10 mm eustatic sea-level rise. An additional 3.5 ± 0....
Published in: | Journal of Glaciology |
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Language: | English |
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Cambridge University Press (CUP)
2017
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Online Access: | http://dx.doi.org/10.1017/jog.2016.138 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143016001386 |
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crcambridgeupr:10.1017/jog.2016.138 2024-06-23T07:53:01+00:00 Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland MOTYKA, ROMAN J. CASSOTTO, RYAN TRUFFER, MARTIN KJELDSEN, KRISTIAN K. VAN AS, DIRK KORSGAARD, NIELS J. FAHNESTOCK, MARK HOWAT, IAN LANGEN, PETER L. MORTENSEN, JOHN LENNERT, KUNUK RYSGAARD, SØREN 2017 http://dx.doi.org/10.1017/jog.2016.138 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143016001386 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 63, issue 238, page 288-308 ISSN 0022-1430 1727-5652 journal-article 2017 crcambridgeupr https://doi.org/10.1017/jog.2016.138 2024-06-12T04:05:06Z ABSTRACT We assess ice loss and velocity changes between 1985 and 2014 of three tidewater and five-land terminating glaciers in Godthåbsfjord (Nuup Kangerlua), Greenland. Glacier thinning accounted for 43.8 ± 0.2 km 3 of ice loss, equivalent to 0.10 mm eustatic sea-level rise. An additional 3.5 ± 0.3 km 3 was lost to the calving retreats of Kangiata Nunaata Sermia (KNS) and Narsap Sermia (NS), two tidewater glaciers that exhibited asynchronous behavior over the study period. KNS has retreated 22 km from its Little Ice Age (LIA) maximum (1761 AD), of which 0.8 km since 1985. KNS has stabilized in shallow water, but seasonally advects a 2 km long floating tongue. In contrast, NS began retreating from its LIA moraine in 2004–06 (0.6 km), re-stabilized, then retreated 3.3 km during 2010–14 into an over-deepened basin. Velocities at KNS ranged 5–6 km a −1 , while at NS they increased from 1.5 to 5.5 km a −1 between 2004 and 2014. We present comprehensive analyses of glacier thinning, runoff, surface mass balance, ocean conditions, submarine melting, bed topography, ice mélange and conclude that the 2010–14 NS retreat was triggered by a combination of factors but primarily by an increase in submarine melting. Article in Journal/Newspaper glacier Godthåbsfjord Greenland Journal of Glaciology Tidewater Cambridge University Press Greenland Narsap Sermia ENVELOPE(-49.750,-49.750,64.683,64.683) Journal of Glaciology 63 238 288 308 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
ABSTRACT We assess ice loss and velocity changes between 1985 and 2014 of three tidewater and five-land terminating glaciers in Godthåbsfjord (Nuup Kangerlua), Greenland. Glacier thinning accounted for 43.8 ± 0.2 km 3 of ice loss, equivalent to 0.10 mm eustatic sea-level rise. An additional 3.5 ± 0.3 km 3 was lost to the calving retreats of Kangiata Nunaata Sermia (KNS) and Narsap Sermia (NS), two tidewater glaciers that exhibited asynchronous behavior over the study period. KNS has retreated 22 km from its Little Ice Age (LIA) maximum (1761 AD), of which 0.8 km since 1985. KNS has stabilized in shallow water, but seasonally advects a 2 km long floating tongue. In contrast, NS began retreating from its LIA moraine in 2004–06 (0.6 km), re-stabilized, then retreated 3.3 km during 2010–14 into an over-deepened basin. Velocities at KNS ranged 5–6 km a −1 , while at NS they increased from 1.5 to 5.5 km a −1 between 2004 and 2014. We present comprehensive analyses of glacier thinning, runoff, surface mass balance, ocean conditions, submarine melting, bed topography, ice mélange and conclude that the 2010–14 NS retreat was triggered by a combination of factors but primarily by an increase in submarine melting. |
format |
Article in Journal/Newspaper |
author |
MOTYKA, ROMAN J. CASSOTTO, RYAN TRUFFER, MARTIN KJELDSEN, KRISTIAN K. VAN AS, DIRK KORSGAARD, NIELS J. FAHNESTOCK, MARK HOWAT, IAN LANGEN, PETER L. MORTENSEN, JOHN LENNERT, KUNUK RYSGAARD, SØREN |
spellingShingle |
MOTYKA, ROMAN J. CASSOTTO, RYAN TRUFFER, MARTIN KJELDSEN, KRISTIAN K. VAN AS, DIRK KORSGAARD, NIELS J. FAHNESTOCK, MARK HOWAT, IAN LANGEN, PETER L. MORTENSEN, JOHN LENNERT, KUNUK RYSGAARD, SØREN Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland |
author_facet |
MOTYKA, ROMAN J. CASSOTTO, RYAN TRUFFER, MARTIN KJELDSEN, KRISTIAN K. VAN AS, DIRK KORSGAARD, NIELS J. FAHNESTOCK, MARK HOWAT, IAN LANGEN, PETER L. MORTENSEN, JOHN LENNERT, KUNUK RYSGAARD, SØREN |
author_sort |
MOTYKA, ROMAN J. |
title |
Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland |
title_short |
Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland |
title_full |
Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland |
title_fullStr |
Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland |
title_full_unstemmed |
Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland |
title_sort |
asynchronous behavior of outlet glaciers feeding godthåbsfjord (nuup kangerlua) and the triggering of narsap sermia's retreat in sw greenland |
publisher |
Cambridge University Press (CUP) |
publishDate |
2017 |
url |
http://dx.doi.org/10.1017/jog.2016.138 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143016001386 |
long_lat |
ENVELOPE(-49.750,-49.750,64.683,64.683) |
geographic |
Greenland Narsap Sermia |
geographic_facet |
Greenland Narsap Sermia |
genre |
glacier Godthåbsfjord Greenland Journal of Glaciology Tidewater |
genre_facet |
glacier Godthåbsfjord Greenland Journal of Glaciology Tidewater |
op_source |
Journal of Glaciology volume 63, issue 238, page 288-308 ISSN 0022-1430 1727-5652 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2016.138 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
238 |
container_start_page |
288 |
op_container_end_page |
308 |
_version_ |
1802644495904276480 |