Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula
The South Shetland Islands are located at the northern tip of the Antarctic Peninsula (AP). This region was subject to strong warming trends in the atmospheric surface layer. Surface air temperature increased about 3K in 50 years, concurrent with retreating glacier fronts, an increase in melt areas,...
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:18954 2023-05-15T13:36:41+02:00 Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula Falk, Ulrike Lopez, Damian A. Silva-Busso, Adrian 2018 https://kups.ub.uni-koeln.de/18954/ eng eng COPERNICUS GESELLSCHAFT MBH Falk, Ulrike orcid:0000-0003-1586-1295 , Lopez, Damian A. and Silva-Busso, Adrian (2018). Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula. Cryosphere, 12 (4). S. 1211 - 1233. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1994-0424 ddc:no doc-type:article publishedVersion 2018 ftubkoeln 2022-11-09T07:16:57Z The South Shetland Islands are located at the northern tip of the Antarctic Peninsula (AP). This region was subject to strong warming trends in the atmospheric surface layer. Surface air temperature increased about 3K in 50 years, concurrent with retreating glacier fronts, an increase in melt areas, ice surface lowering and rapid break-up and disintegration of ice shelves. The positive trend in surface air temperature has currently come to a halt. Observed surface air temperature lapse rates show a high variability during winter months (standard deviations up to +/- 1.0K (100m)(-1)) and a distinct spatial heterogeneity reflecting the impact of synoptic weather patterns. The increased mesocyclonic activity during the wintertime over the past decades in the study area results in intensified advection of warm, moist air with high temperatures and rain and leads to melt conditions on the ice cap, fixating surface air temperatures to the melting point. Its impact on winter accumulation results in the observed negative mass balance estimates. Six years of continuous glaciological measurements on mass balance stake transects as well as 5 years of climatological data time series are presented and a spatially distributed glacier energy balance melt model adapted and run based on these multi-year data sets. The glaciological surface mass balance model is generally in good agreement with observations, except for atmospheric conditions promoting snow drift by high wind speeds, turbulence-driven snow deposition and snow layer erosion by rain. No drift in the difference between simulated mass balance and mass balance measurements can be seen over the course of the 5-year model run period. The winter accumulation does not suffice to compensate for the high variability in summer ablation. The results are analysed to assess changes in meltwater input to the coastal waters, specific glacier mass balance and the equilibrium line altitude (ELA). The Fourcade Glacier catchment drains into Potter cove, has an area of 23.6km(2) and is ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice cap Ice Shelves King George Island South Shetland Islands Cologne University: KUPS Antarctic Antarctic Peninsula Ela ENVELOPE(9.642,9.642,63.170,63.170) Fourcade ENVELOPE(-62.490,-62.490,-64.612,-64.612) Fourcade Glacier ENVELOPE(-58.666,-58.666,-62.216,-62.216) King George Island Potter Cove South Shetland Islands The Antarctic |
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Cologne University: KUPS |
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English |
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ddc:no Falk, Ulrike Lopez, Damian A. Silva-Busso, Adrian Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula |
topic_facet |
ddc:no |
description |
The South Shetland Islands are located at the northern tip of the Antarctic Peninsula (AP). This region was subject to strong warming trends in the atmospheric surface layer. Surface air temperature increased about 3K in 50 years, concurrent with retreating glacier fronts, an increase in melt areas, ice surface lowering and rapid break-up and disintegration of ice shelves. The positive trend in surface air temperature has currently come to a halt. Observed surface air temperature lapse rates show a high variability during winter months (standard deviations up to +/- 1.0K (100m)(-1)) and a distinct spatial heterogeneity reflecting the impact of synoptic weather patterns. The increased mesocyclonic activity during the wintertime over the past decades in the study area results in intensified advection of warm, moist air with high temperatures and rain and leads to melt conditions on the ice cap, fixating surface air temperatures to the melting point. Its impact on winter accumulation results in the observed negative mass balance estimates. Six years of continuous glaciological measurements on mass balance stake transects as well as 5 years of climatological data time series are presented and a spatially distributed glacier energy balance melt model adapted and run based on these multi-year data sets. The glaciological surface mass balance model is generally in good agreement with observations, except for atmospheric conditions promoting snow drift by high wind speeds, turbulence-driven snow deposition and snow layer erosion by rain. No drift in the difference between simulated mass balance and mass balance measurements can be seen over the course of the 5-year model run period. The winter accumulation does not suffice to compensate for the high variability in summer ablation. The results are analysed to assess changes in meltwater input to the coastal waters, specific glacier mass balance and the equilibrium line altitude (ELA). The Fourcade Glacier catchment drains into Potter cove, has an area of 23.6km(2) and is ... |
format |
Article in Journal/Newspaper |
author |
Falk, Ulrike Lopez, Damian A. Silva-Busso, Adrian |
author_facet |
Falk, Ulrike Lopez, Damian A. Silva-Busso, Adrian |
author_sort |
Falk, Ulrike |
title |
Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula |
title_short |
Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula |
title_full |
Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula |
title_fullStr |
Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula |
title_full_unstemmed |
Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula |
title_sort |
multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on king george island, antarctic peninsula |
publisher |
COPERNICUS GESELLSCHAFT MBH |
publishDate |
2018 |
url |
https://kups.ub.uni-koeln.de/18954/ |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) ENVELOPE(-62.490,-62.490,-64.612,-64.612) ENVELOPE(-58.666,-58.666,-62.216,-62.216) |
geographic |
Antarctic Antarctic Peninsula Ela Fourcade Fourcade Glacier King George Island Potter Cove South Shetland Islands The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula Ela Fourcade Fourcade Glacier King George Island Potter Cove South Shetland Islands The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Ice cap Ice Shelves King George Island South Shetland Islands |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice cap Ice Shelves King George Island South Shetland Islands |
op_relation |
Falk, Ulrike orcid:0000-0003-1586-1295 , Lopez, Damian A. and Silva-Busso, Adrian (2018). Multi-year analysis of distributed glacier mass balance modelling and equilibrium line altitude on King George Island, Antarctic Peninsula. Cryosphere, 12 (4). S. 1211 - 1233. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1994-0424 |
_version_ |
1766082406322798592 |