Response of the large-scale subglacial drainage system of Northeast Greenland to surface elevation changes

N.B. Karlsson, D. Dahl-Jensen

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

14 Citationer (Scopus)

Abstrakt

The influence of subglacial water on the dynamics of ice flow has been the object of increasing interest in the past decade. In this study we focus on large-scale, long-term changes in surface elevation over Northeast Greenland and the corresponding changes in subglacial water routeways. Our results show that over timescales ranging from decades to millennia the area may experience redistribution of and fluctuation in subglacial water outflux under the main glacier outlets. The fluctuations in subglacial water routing occur even in the absence of external forcing. Based on these results we conclude that changes in the subglacial water routeways are an intrinsic part of the drainage basin dynamics, where the subglacial system is likely always in a transient state. The results also imply that fluctuations at the margins observed at present might originate from changes several hundred kilometres upstream. Since surface elevation changes may propagate upstream over timescales much longer than the observational period, the cause of the fluctuations may not be present in current observational records.

OriginalsprogEngelsk
Sider (fra-til)1465-1479
Antal sider15
TidsskriftCryosphere
Vol/bind9
Udgave nummer4
DOI
StatusUdgivet - 6 aug. 2015
Udgivet eksterntJa

Programområde

  • Programområde 5: Natur og klima

Fingeraftryk

Dyk ned i forskningsemnerne om 'Response of the large-scale subglacial drainage system of Northeast Greenland to surface elevation changes'. Sammen danner de et unikt fingeraftryk.

Citationsformater