Towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the Greenland tidewater glaciers: A study based on global climate model simulations of pre-industrial, historical and RCP 8.5 scenarios
The Greenland Ice Sheet has a total volume of 2900000 km3. In recent decades, the ice-sheet has been losing mass rapidly and has nearly doubled its contribution to sea-level rise. One main contributing factor has been the recent widespread acceleration of the tidewater glaciers that terminate in dee...
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fttudelft:oai:tudelft.nl:uuid:be5a3909-5983-43ea-b2df-a8c074cafb3c 2023-07-30T04:02:13+02:00 Towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the Greenland tidewater glaciers: A study based on global climate model simulations of pre-industrial, historical and RCP 8.5 scenarios Prakash, Abhay (author) Vizcaino, Miren (mentor) Bradley, Sarah (mentor) Klees, Roland (mentor) Katsman, Caroline (mentor) Delft University of Technology (degree granting institution) 66.35000, -38.20000 2017-12-05 http://resolver.tudelft.nl/uuid:be5a3909-5983-43ea-b2df-a8c074cafb3c en eng http://resolver.tudelft.nl/uuid:be5a3909-5983-43ea-b2df-a8c074cafb3c © 2017 Abhay Prakash Greenland ice sheet tidewater glaciers GCMs climate projections spatio-temporal variability Kangerlussuaq Helheim Jakobshavn master thesis 2017 fttudelft 2023-07-08T20:20:21Z The Greenland Ice Sheet has a total volume of 2900000 km3. In recent decades, the ice-sheet has been losing mass rapidly and has nearly doubled its contribution to sea-level rise. One main contributing factor has been the recent widespread acceleration of the tidewater glaciers that terminate in deep and narrow glacial fjords. However, our understanding of the subsurface water properties causing this acceleration has been extremely limited owing to the lack of observations around these locations. We hypothesize that while the ice-sheet is not coupled to the ocean in the current General Circulation Models (GCMs), they can still be used to improve our understanding of the subsurface warming around these regions. In this study, we first evaluate two GCMs (HADGEM2-ES and GISS-E2-R) around three tidewater glacier locations, by interpolating the high resolution CTD data to the GCM grid. Our results substantiate that GISS-E2-R performs better than the HADGEM2-ES model along the Western Margin. However, along the Eastern Margin, we find that the HADGEM2-ES model is more consistent with the observations. The modelled spatio-temporal variability of water masses was investigated in a Pre-Industrial and Historical simulation, later used to quantify the evolution of subsurface warming under a future warming (RCP 8.5) scenario. Our results show that the Kangerlussuaq glacier (shelf) is more sensitive to greenhouse gas (GHG) forcings than Helheim and Jakobshavn. With respect to the Pre-Industrial climate, the mean warming of the Kangerlussuaq shelf under the RCP 8.5 scenario is 3.76°C, which is considerably greater than Helheim (2.38°C) and Jakobshavn (1.92°C). This is predominantly driven by the subsurface Return Waters of the Arctic Atlantic which are seen to warm the most under a future warming (RCP 8.5) scenario. For each of the three simulation, we decompose the Ocean Heat Content (OHC) time-series into intrinsic oscillatory modes so as to discern and quantify the high frequency variability from the multi-year/decadal ... Master Thesis Arctic glacier Greenland Ice Sheet Jakobshavn Kangerlussuaq Tidewater Delft University of Technology: Institutional Repository Arctic Greenland Kangerlussuaq ENVELOPE(-55.633,-55.633,72.633,72.633) |
institution |
Open Polar |
collection |
Delft University of Technology: Institutional Repository |
op_collection_id |
fttudelft |
language |
English |
topic |
Greenland ice sheet tidewater glaciers GCMs climate projections spatio-temporal variability Kangerlussuaq Helheim Jakobshavn |
spellingShingle |
Greenland ice sheet tidewater glaciers GCMs climate projections spatio-temporal variability Kangerlussuaq Helheim Jakobshavn Prakash, Abhay (author) Towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the Greenland tidewater glaciers: A study based on global climate model simulations of pre-industrial, historical and RCP 8.5 scenarios |
topic_facet |
Greenland ice sheet tidewater glaciers GCMs climate projections spatio-temporal variability Kangerlussuaq Helheim Jakobshavn |
description |
The Greenland Ice Sheet has a total volume of 2900000 km3. In recent decades, the ice-sheet has been losing mass rapidly and has nearly doubled its contribution to sea-level rise. One main contributing factor has been the recent widespread acceleration of the tidewater glaciers that terminate in deep and narrow glacial fjords. However, our understanding of the subsurface water properties causing this acceleration has been extremely limited owing to the lack of observations around these locations. We hypothesize that while the ice-sheet is not coupled to the ocean in the current General Circulation Models (GCMs), they can still be used to improve our understanding of the subsurface warming around these regions. In this study, we first evaluate two GCMs (HADGEM2-ES and GISS-E2-R) around three tidewater glacier locations, by interpolating the high resolution CTD data to the GCM grid. Our results substantiate that GISS-E2-R performs better than the HADGEM2-ES model along the Western Margin. However, along the Eastern Margin, we find that the HADGEM2-ES model is more consistent with the observations. The modelled spatio-temporal variability of water masses was investigated in a Pre-Industrial and Historical simulation, later used to quantify the evolution of subsurface warming under a future warming (RCP 8.5) scenario. Our results show that the Kangerlussuaq glacier (shelf) is more sensitive to greenhouse gas (GHG) forcings than Helheim and Jakobshavn. With respect to the Pre-Industrial climate, the mean warming of the Kangerlussuaq shelf under the RCP 8.5 scenario is 3.76°C, which is considerably greater than Helheim (2.38°C) and Jakobshavn (1.92°C). This is predominantly driven by the subsurface Return Waters of the Arctic Atlantic which are seen to warm the most under a future warming (RCP 8.5) scenario. For each of the three simulation, we decompose the Ocean Heat Content (OHC) time-series into intrinsic oscillatory modes so as to discern and quantify the high frequency variability from the multi-year/decadal ... |
author2 |
Vizcaino, Miren (mentor) Bradley, Sarah (mentor) Klees, Roland (mentor) Katsman, Caroline (mentor) Delft University of Technology (degree granting institution) |
format |
Master Thesis |
author |
Prakash, Abhay (author) |
author_facet |
Prakash, Abhay (author) |
author_sort |
Prakash, Abhay (author) |
title |
Towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the Greenland tidewater glaciers: A study based on global climate model simulations of pre-industrial, historical and RCP 8.5 scenarios |
title_short |
Towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the Greenland tidewater glaciers: A study based on global climate model simulations of pre-industrial, historical and RCP 8.5 scenarios |
title_full |
Towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the Greenland tidewater glaciers: A study based on global climate model simulations of pre-industrial, historical and RCP 8.5 scenarios |
title_fullStr |
Towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the Greenland tidewater glaciers: A study based on global climate model simulations of pre-industrial, historical and RCP 8.5 scenarios |
title_full_unstemmed |
Towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the Greenland tidewater glaciers: A study based on global climate model simulations of pre-industrial, historical and RCP 8.5 scenarios |
title_sort |
towards quantifying changes in the modelled spatio-temporal variability in the ocean heat forcing to the greenland tidewater glaciers: a study based on global climate model simulations of pre-industrial, historical and rcp 8.5 scenarios |
publishDate |
2017 |
url |
http://resolver.tudelft.nl/uuid:be5a3909-5983-43ea-b2df-a8c074cafb3c |
op_coverage |
66.35000, -38.20000 |
long_lat |
ENVELOPE(-55.633,-55.633,72.633,72.633) |
geographic |
Arctic Greenland Kangerlussuaq |
geographic_facet |
Arctic Greenland Kangerlussuaq |
genre |
Arctic glacier Greenland Ice Sheet Jakobshavn Kangerlussuaq Tidewater |
genre_facet |
Arctic glacier Greenland Ice Sheet Jakobshavn Kangerlussuaq Tidewater |
op_relation |
http://resolver.tudelft.nl/uuid:be5a3909-5983-43ea-b2df-a8c074cafb3c |
op_rights |
© 2017 Abhay Prakash |
_version_ |
1772812942150991872 |