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Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland

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dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Motyka, Roman J.
dc.contributor.author Cassotto, Ryan
dc.contributor.author Truffer, Martin
dc.contributor.author Kjeldsen, Kristian K.
dc.contributor.author Van As, Dirk
dc.contributor.author Korsgaard, Niels Jakup
dc.contributor.author Fahnestock, Mark
dc.contributor.author Howat, Ian
dc.contributor.author Langen, Peter L.
dc.contributor.author Mortensen, John
dc.contributor.author Lennert, Kunuk
dc.contributor.author Rysgaard, Søren
dc.date.accessioned 2017-05-16T10:08:36Z
dc.date.available 2017-05-16T10:08:36Z
dc.date.issued 2017-01-25
dc.identifier.citation MOTYKA, R., CASSOTTO, R., TRUFFER, M., KJELDSEN, K., VAN AS, D., KORSGAARD, N., . . . RYSGAARD, S. (2017). Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland. Journal of Glaciology, 63(238), 288-308. doi:10.1017/jog.2016.138
dc.identifier.issn 0022-1430
dc.identifier.issn 1727-5652 (e-ISSN)
dc.identifier.uri https://hdl.handle.net/20.500.11815/270
dc.description.abstract We assess ice loss and velocity changes between 1985 and 2014 of three tidewater and fiveland terminating glaciers in Godthabsfjord (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 melange and conclude that the 2010-14 NS retreat was triggered by a combination of factors but primarily by an increase in submarine melting.
dc.description.sponsorship We thank W. Dryer and D. Podrasky for assistance with fieldwork and L. Kenefic for assisting with digitizing glacier front positions. CH2 M HILL Polar Services and Air Greenland provided logistics support. The SPOT-5 images used for the 2008 DEM were provided by the SPIRIT program (Centre National d'Etudes Spatiales, France). The DigitalGlobe Worldview images used for the 2014 DEM were obtained from P. Morin. Terminus positions were derived from Landsat images courtesy of the U.S. Geological Survey. Funding was provided by the US National Science Foundation (NSF) Office of Polar Programs (OPP) grants NSF PLR-0909552 and NSF PLR-0909333. Cassotto is supported by NASA under the Earth and Space Science Fellowship Program (Grant NNX14AL29H). K. K. Kjeldsen acknowledges support from the Danish Council Research for Independent Research (grant no. DFF-409000151). K. Kjaer is thanked for his support during the earlier phases of this study. On-ice weather stations are operated by GEUS (Denmark) within the Programme for Monitoring of the Greenland Ice Sheet (PROMICE). J. Mortensen acknowledges support from IIKNN (Greenland), DEFROST project of the Nordic Centre of Excellence program "Interaction between Climate Change and the Cryosphere" and the Greenland Ecosystem Monitoring Programme (www. g-e-m. dk).S. Rysgaard was funded by the Canada Excellence Research Chair Programme. Additional funding was provided by the Geophysical Institute, University of Alaska Fairbanks, and Greenland Climate Research Centre. Scientific editor H. Fricker and reviewers H. Jiskoot and G. Cogley provided very constructive feedback that helped improve the paper.
dc.format.extent 288-308
dc.language.iso en
dc.publisher Cambridge University Press (CUP)
dc.relation.ispartofseries Journal of Glaciology;63(238)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Glacier calving
dc.subject Glacier discharge
dc.subject Glacier mass balance
dc.subject Ice/ocean interactions
dc.subject Tidewater glaciers
dc.subject Jöklar
dc.subject Jöklarannsóknir
dc.subject Bráðnun (jöklafræði)
dc.title Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland
dc.type info:eu-repo/semantics/article
dcterms.license This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence
dc.description.version Peer Reviewed
dc.description.version Ritrýnt tímarit
dc.identifier.journal Journal of Glaciology
dc.identifier.doi 10.1017/jog.2016.138
dc.relation.url https://www.cambridge.org/core/journals/journal-of-glaciology/article/asynchronous-behavior-of-outlet-glaciers-feeding-godthabsfjord-nuup-kangerlua-and-the-triggering-of-narsap-sermias-retreat-in-sw-greenland/FA8FE2F16833767D40557FAC8F6AC70D
dc.contributor.department Norræna eldfjallasetrið (HÍ)
dc.contributor.department Nordic Volcanological Centre (UI)
dc.contributor.department Jarðvísindastofnun (HÍ)
dc.contributor.department Institute of Earth Sciences (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)


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