Article (Scientific journals)
Repeated subglacial jökulhlaups in northeastern Greenland revealed by CryoSat
Gray, Laurence; Burgess, David; Copland, Luke et al.
2024In Journal of Glaciology, p. 1-11
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Keywords :
Earth-Surface Processes
Abstract :
[en] Surface height changes above three previously undetected subglacial lakes in northeastern Greenland are documented using CryoSat, DEMs and ICESat-2. Between February 7 and March 6, 2012, the central ice region (22.6 km2) above the largest lake dropped by around 37 m followed by a further drop of 12 m in the following 29 days. This implies a subglacial water outflow, or jökulhlaup, of at least 1 km3 at rates of hundreds of cubic meters per second. A comparable outflow occurred again between 23 July and 15 September 2019, with smaller outflows in the fall of 2014 and 2016. In contrast, a second smaller subglacial lake at a higher elevation had two subglacial outbursts of around 0.3 km3 in 2012 and 2019 but the lake filling was gradual and not strongly seasonal or episodic. Water remained in both lakes after the outflows but this may not be the case for the third smallest and lowest subglacial lake. While there appears to be some hydrological link between the three lakes, the flux of water moving under the ice in this area appears to be larger than would be expected from local summer melt. However, the source of the excess water remains uncertain.
Research Center/Unit :
SPHERES - ULiège [BE]
Disciplines :
Earth sciences & physical geography
Author, co-author :
Gray, Laurence ;  Department of Geography, Environment and Geomatics, University of Ottawa, Ottawa, Canada
Burgess, David;  Geological Survey of Canada, Natural Resources Canada, Ottawa, Canada
Copland, Luke ;  Department of Geography, Environment and Geomatics, University of Ottawa, Ottawa, Canada
Dow, Christine ;  Department of Geography and Environmental Management, University of Waterloo, Canada
Fettweis, Xavier  ;  Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Fisher, David;  Department of Earth Science, University of Ottawa, Ottawa, Canada
Kochtitzky, Will ;  School of Marine and Environmental Programs, University of New England, Biddeford, United States
van Wychen, Wesley;  Department of Geography and Environmental Management, University of Waterloo, Canada
Zheng, James;  Geological Survey of Canada, Natural Resources Canada, Ottawa, Canada
Language :
English
Title :
Repeated subglacial jökulhlaups in northeastern Greenland revealed by CryoSat
Publication date :
2024
Journal title :
Journal of Glaciology
ISSN :
0022-1430
eISSN :
1727-5652
Publisher :
Cambridge University Press
Pages :
1-11
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
Available on ORBi :
since 07 May 2024

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