The hydrostatic control of load-induced height changes above subglacial Lake Vostok

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

Abstract

Lake Vostok, East Antarctica, represents an extensive water surface at the base of the ice sheet. Snow, ice and atmospheric pressure loads applied anywhere within the lake area produce a hydrostatic response, involving deformations of the ice surface, ice-water interface and particle horizons. A modelling scheme is developed to derive height changes of these surfaces for a given load pattern. It is applied to a series of load scenarios, and predictions based on load fields derived from a regional climate model are compared to observational datasets. Our results show that surface height changes due to snow-buildup anomalies are damped over the lake area, reducing the spatial standard deviation by one-third. The response to air pressure variations, in turn, adds surface height variability. Atmospheric pressure loads may produce height changes of up to ±4 cm at daily resolution, but decay rapidly with integration time. The hydrostatic load response has no significant impact neither on ICESat laser campaign biases determined over the lake area nor on vertical particle movements derived from GNSS observations.

Details

OriginalspracheEnglisch
Seiten (von - bis)849-866
Seitenumfang18
FachzeitschriftJournal of Glaciology
Jahrgang68
Ausgabenummer271
PublikationsstatusVeröffentlicht - 11 Apr. 2022
Peer-Review-StatusJa

Externe IDs

Scopus 85129010332
WOS 000780667400001
Mendeley 266338dd-cdf2-3614-82ca-1382276839f0

Schlagworte

Fächergruppen, Lehr- und Forschungsbereiche, Fachgebiete nach Destatis

Ziele für nachhaltige Entwicklung

ASJC Scopus Sachgebiete

Schlagwörter

  • Ice dynamics, laser altimetry, subglacial lakes, ALTIMETRY DATA, SATELLITE, RADAR, CIRCULATION, GLACIAL ISOSTATIC-ADJUSTMENT, GNSS, EAST ANTARCTICA, FLOW VELOCITIES, GREENLAND ICE-SHEET, CLIMATE

Bibliotheksschlagworte