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Draining and Filling of an Interconnected Sub-glacial Lake Network in East Antarctica

Hogg, Anna E. und Rigby, Richard und Gourmelen, Noel und Wessel, Birgit und Slater, Thomas und Malczyk, George und Wearing, Martin und Goldberg, Daniel (2022) Draining and Filling of an Interconnected Sub-glacial Lake Network in East Antarctica. In: ESA Living Planet Symposium 2022. ESA Living Planet Symposium 2022, 2022-05-23 - 2022-05-27, Bonn, Germany.

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Kurzfassung

The Antarctic Ice sheet is a key component of the Earth system, impacting on global sea level, ocean circulation and atmospheric processes. Meltwater is generated at the ice sheet base primarily by geothermal heating and friction associated with ice flow, and this feeds a vast network of lakes and rivers creating a unique hydrological environment. Subglacial lakes play a fundamental role in the Antarctic ice sheet hydrological system because outbursts from ‘active’ lakes can trigger, (i) change in ice speed, (ii) a burst of freshwater input into the ocean which generates buoyant meltwater plumes, and (iii) evolution of glacial landforms and sub-glacial habitats. Despite the key role that sub-glacial hydrology plays on the ice sheet environment, there are limited observations of repeat sub-glacial lake activity resulting in poor knowledge of the timing and frequency of these events. Even rarer are examples of interconnected lake activity, where the draining of one lake triggers filling of another. Observations of this nature help us better characterise these events and the impact they may have on Antarctica’s hydrological budget, and will advance our knowledge of the physical mechanism responsible for triggering this activity. In this study we analyse 9-years of CryoSat-2 radar altimetry data, to investigate a newly identified sub-glacial network in the Amery basin, East Antarctica. CryoSat-2 data was processed in ‘swath mode’, increasing the density of elevation measurements across the study area. The plane fit method was employed in 500 m by 500 m grid cells, to measure surface elevation change at relatively high spatial resolution. We identified a network of 10 active subglacial lakes in the Amery basin. 7 of these lakes, located below Lambert Glacier, show interconnected hydrological behaviour, with filling and drainage events throughout the study period. We observed ice surface height change of up to 6 meters on multiple lakes, and these observations were validated by independently acquired TanDEM-X DEM differencing. We then use these observations in conjunction with simulation of the melt water production and transport at the base of the ice sheet and across the grounding line to constrain sub-glacial fluxes and explore its impact on ocean circulation and ice-ocean interaction. This case study is an important decade long record of hydrological activity beneath the Antarctic Ice Sheet which demonstrates the importance of high resolution swath mode measurements. In the future the Lambert lake network will be used to better understand the filling and draining life cycle of sub-glacial hydrological activity under the Antarctic Ice Sheet.

elib-URL des Eintrags:https://elib.dlr.de/187239/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Draining and Filling of an Interconnected Sub-glacial Lake Network in East Antarctica
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Hogg, Anna E.University of Leeds, Leeds, UKhttps://orcid.org/0000-0002-6441-4937NICHT SPEZIFIZIERT
Rigby, RichardUniversity of Leeds, Leeds, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Gourmelen, NoelUniversity of Edinburgh, UKhttps://orcid.org/0000-0003-3346-9289NICHT SPEZIFIZIERT
Wessel, BirgitBirgit.Wessel (at) dlr.dehttps://orcid.org/0000-0002-8673-2485NICHT SPEZIFIZIERT
Slater, ThomasSchool of Earth and Environment, University of Leeds, Leeds, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Malczyk, GeorgeUniversity of Edinburgh, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wearing, MartinUniversity of Edinburgh, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Goldberg, DanielUniversity of Edinburgh, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2022
Erschienen in:ESA Living Planet Symposium 2022
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Anarctica, hydrology, subglacial, lake, CryoSat-2, TanDEM-X
Veranstaltungstitel:ESA Living Planet Symposium 2022
Veranstaltungsort:Bonn, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:23 Mai 2022
Veranstaltungsende:27 Mai 2022
Veranstalter :LPS22
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Technologie-Experimente TSX und TDX
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Dynamik der Landoberfläche
Hinterlegt von: Wessel, Dr.-Ing. Birgit
Hinterlegt am:27 Jul 2022 09:27
Letzte Änderung:24 Apr 2024 20:48

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