Investigating the response of Greenland and Antarctic glaciers to atmospheric and oceanic forcings using a 1D flowline model
Over the past two decades, the mass loss from the Antarctic and Greenland ice sheets has contributed approximately 11.2 _ 3.8 mm to global mean sea level, one third of the total sea level rise since the 1990s. The majority of this mass loss has come from the acceleration of tidewater outlet glaciers...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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Institutes outside Greece
2017
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Online Access: | http://hdl.handle.net/10442/hedi/50299 https://doi.org/10.12681/eadd/50299 |
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fthedi:oai:10442/50299 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
National Archive of PhD Theses (National Documentation Centre Greece) |
op_collection_id |
fthedi |
language |
English |
topic |
Παγετωνική ιστορία Παγετωνικές περίοδοι Μαθηματικό μοντέλο Γεωφυσική έρευνα Γεωφυσική Εφαρμοσμένη γεωφυσική Συνδυαστική γεωφυσική διερεύνηση Γεωλογία Ανάκτηση δορυφορικών δεδομένων Ανάλυση δορυφορικών εικόνων Επεξεργασία δορυφορικών εικόνων Ατμοσφαιρική διόρθωση δορυφορικών εικόνων Αλγόριθμοι ροής Αναλύσεις ρευστομηχανικής glaciology Glacial periods Glacial history Matlab Software tools in matlab Matlab programming environment Antarctica Greenland ice sheet glacier Numerical modelling Numerical model pyhton Mathematical model Mathematical modeling and simulation Mathematical modelling Climate change impact Climate change Intergovernmental panel on climate change (IPCC Climate Remote sensing - G.I.S Remote sensing data Remote sensing techniques Remote sensing Satellite remote sensing MODIS satellite data Satellite imagery Landsat-8 LANDSAT-5 /TM LANDSAT Non-geostationary satellite systems Sea level changes Sea level variations Sea level rise Γεωεπιστήμες και Επιστήμες Περιβάλλοντος Φυσικές Επιστήμες |
spellingShingle |
Παγετωνική ιστορία Παγετωνικές περίοδοι Μαθηματικό μοντέλο Γεωφυσική έρευνα Γεωφυσική Εφαρμοσμένη γεωφυσική Συνδυαστική γεωφυσική διερεύνηση Γεωλογία Ανάκτηση δορυφορικών δεδομένων Ανάλυση δορυφορικών εικόνων Επεξεργασία δορυφορικών εικόνων Ατμοσφαιρική διόρθωση δορυφορικών εικόνων Αλγόριθμοι ροής Αναλύσεις ρευστομηχανικής glaciology Glacial periods Glacial history Matlab Software tools in matlab Matlab programming environment Antarctica Greenland ice sheet glacier Numerical modelling Numerical model pyhton Mathematical model Mathematical modeling and simulation Mathematical modelling Climate change impact Climate change Intergovernmental panel on climate change (IPCC Climate Remote sensing - G.I.S Remote sensing data Remote sensing techniques Remote sensing Satellite remote sensing MODIS satellite data Satellite imagery Landsat-8 LANDSAT-5 /TM LANDSAT Non-geostationary satellite systems Sea level changes Sea level variations Sea level rise Γεωεπιστήμες και Επιστήμες Περιβάλλοντος Φυσικές Επιστήμες Petrakopoulos, Konstantinos Πετρακόπουλος, Κωνσταντίνος Investigating the response of Greenland and Antarctic glaciers to atmospheric and oceanic forcings using a 1D flowline model |
topic_facet |
Παγετωνική ιστορία Παγετωνικές περίοδοι Μαθηματικό μοντέλο Γεωφυσική έρευνα Γεωφυσική Εφαρμοσμένη γεωφυσική Συνδυαστική γεωφυσική διερεύνηση Γεωλογία Ανάκτηση δορυφορικών δεδομένων Ανάλυση δορυφορικών εικόνων Επεξεργασία δορυφορικών εικόνων Ατμοσφαιρική διόρθωση δορυφορικών εικόνων Αλγόριθμοι ροής Αναλύσεις ρευστομηχανικής glaciology Glacial periods Glacial history Matlab Software tools in matlab Matlab programming environment Antarctica Greenland ice sheet glacier Numerical modelling Numerical model pyhton Mathematical model Mathematical modeling and simulation Mathematical modelling Climate change impact Climate change Intergovernmental panel on climate change (IPCC Climate Remote sensing - G.I.S Remote sensing data Remote sensing techniques Remote sensing Satellite remote sensing MODIS satellite data Satellite imagery Landsat-8 LANDSAT-5 /TM LANDSAT Non-geostationary satellite systems Sea level changes Sea level variations Sea level rise Γεωεπιστήμες και Επιστήμες Περιβάλλοντος Φυσικές Επιστήμες |
description |
Over the past two decades, the mass loss from the Antarctic and Greenland ice sheets has contributed approximately 11.2 _ 3.8 mm to global mean sea level, one third of the total sea level rise since the 1990s. The majority of this mass loss has come from the acceleration of tidewater outlet glaciers, through mechanisms that are poorly understood. While we know that the recent increase in mass loss is due to climate changes, questions remain about the processes that both destabilize and stabilize glaciers. Being able to characterize these processes is essential for producing realistic ice sheet mass balance predictions. In this dissertation, we use a width average (1-D) flowline model to investigate the current and past behavior of glaciers in both Antarctica and Greenland, with the broader goal of understanding how they respond to increased climate variability. In the first chapter, we show that the unique behavior of Helheim Glacier in East Greenland is driven primarily by atmospheric, not ocean variability. In the second chapter, we address the role of glacier geometry in modulating decadal-scale dynamics of Greenland glaciers. Our results show that, contrary to many assumptions, width and bed topography only play a small role in controlling mass loss during retreat. The third chapter focuses on the retreat of Byrd Glacier, East Antarctica from its grounding line during the Last Glacial Maximum (LGM), to its current configuration, under rising atmospheric and oceanic temperatures. We show that atmospheric changes are the primary driver for the retreat, and that the current geometry of the Ross Ice Shelf has been similar for the last 2,000 years. The results of this thesis increase our knowledge of Greenland and Antarctic glacier dynamics, their relationship with atmospheric and oceanic forcings, and their future contribution to sea-level. Τις τελευταίες δύο δεκαετίες, η απώλεια μάζας από τα στρώματα πάγου της Ανταρκτικής και της Γροιλανδίας έχει συνεισφέρει περίπου 11,2 +/- 3,8 mm στην παγκόσμια μέση στάθμη ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Petrakopoulos, Konstantinos Πετρακόπουλος, Κωνσταντίνος |
author_facet |
Petrakopoulos, Konstantinos Πετρακόπουλος, Κωνσταντίνος |
author_sort |
Petrakopoulos, Konstantinos |
title |
Investigating the response of Greenland and Antarctic glaciers to atmospheric and oceanic forcings using a 1D flowline model |
title_short |
Investigating the response of Greenland and Antarctic glaciers to atmospheric and oceanic forcings using a 1D flowline model |
title_full |
Investigating the response of Greenland and Antarctic glaciers to atmospheric and oceanic forcings using a 1D flowline model |
title_fullStr |
Investigating the response of Greenland and Antarctic glaciers to atmospheric and oceanic forcings using a 1D flowline model |
title_full_unstemmed |
Investigating the response of Greenland and Antarctic glaciers to atmospheric and oceanic forcings using a 1D flowline model |
title_sort |
investigating the response of greenland and antarctic glaciers to atmospheric and oceanic forcings using a 1d flowline model |
publisher |
Institutes outside Greece |
publishDate |
2017 |
url |
http://hdl.handle.net/10442/hedi/50299 https://doi.org/10.12681/eadd/50299 |
long_lat |
ENVELOPE(160.333,160.333,-80.250,-80.250) |
geographic |
Antarctic Byrd Byrd Glacier East Antarctica Greenland Ross Ice Shelf The Antarctic |
geographic_facet |
Antarctic Byrd Byrd Glacier East Antarctica Greenland Ross Ice Shelf The Antarctic |
genre |
Antarc* Antarctic Antarctica Byrd Glacier East Antarctica East Greenland glacier Greenland Ice Sheet Ice Shelf Ross Ice Shelf Tidewater |
genre_facet |
Antarc* Antarctic Antarctica Byrd Glacier East Antarctica East Greenland glacier Greenland Ice Sheet Ice Shelf Ross Ice Shelf Tidewater |
op_relation |
doi:10.12681/eadd/50299 http://hdl.handle.net/10442/hedi/50299 |
op_doi |
https://doi.org/10.12681/eadd/50299 |
_version_ |
1809819223697915904 |
spelling |
fthedi:oai:10442/50299 2024-09-09T19:05:13+00:00 Investigating the response of Greenland and Antarctic glaciers to atmospheric and oceanic forcings using a 1D flowline model Διερεύνηση της δυναμικής απόκρισης παγετώνων στην Γροιλανδία και την Ανταρκτική από τις μεταβολές ατμοσφαιρικών και ωκεάνιων παραμέτρων χρησιμοποιώντας ένα μονοδιαστατό χωρικά κατανεμημένo μοντέλο παγετωνικής ροής Petrakopoulos, Konstantinos Πετρακόπουλος, Κωνσταντίνος 2017 http://hdl.handle.net/10442/hedi/50299 https://doi.org/10.12681/eadd/50299 eng eng Institutes outside Greece Ιδρύματα Εξωτερικού doi:10.12681/eadd/50299 http://hdl.handle.net/10442/hedi/50299 Παγετωνική ιστορία Παγετωνικές περίοδοι Μαθηματικό μοντέλο Γεωφυσική έρευνα Γεωφυσική Εφαρμοσμένη γεωφυσική Συνδυαστική γεωφυσική διερεύνηση Γεωλογία Ανάκτηση δορυφορικών δεδομένων Ανάλυση δορυφορικών εικόνων Επεξεργασία δορυφορικών εικόνων Ατμοσφαιρική διόρθωση δορυφορικών εικόνων Αλγόριθμοι ροής Αναλύσεις ρευστομηχανικής glaciology Glacial periods Glacial history Matlab Software tools in matlab Matlab programming environment Antarctica Greenland ice sheet glacier Numerical modelling Numerical model pyhton Mathematical model Mathematical modeling and simulation Mathematical modelling Climate change impact Climate change Intergovernmental panel on climate change (IPCC Climate Remote sensing - G.I.S Remote sensing data Remote sensing techniques Remote sensing Satellite remote sensing MODIS satellite data Satellite imagery Landsat-8 LANDSAT-5 /TM LANDSAT Non-geostationary satellite systems Sea level changes Sea level variations Sea level rise Γεωεπιστήμες και Επιστήμες Περιβάλλοντος Φυσικές Επιστήμες PhD Thesis 2017 fthedi https://doi.org/10.12681/eadd/50299 2024-06-18T14:32:12Z Over the past two decades, the mass loss from the Antarctic and Greenland ice sheets has contributed approximately 11.2 _ 3.8 mm to global mean sea level, one third of the total sea level rise since the 1990s. The majority of this mass loss has come from the acceleration of tidewater outlet glaciers, through mechanisms that are poorly understood. While we know that the recent increase in mass loss is due to climate changes, questions remain about the processes that both destabilize and stabilize glaciers. Being able to characterize these processes is essential for producing realistic ice sheet mass balance predictions. In this dissertation, we use a width average (1-D) flowline model to investigate the current and past behavior of glaciers in both Antarctica and Greenland, with the broader goal of understanding how they respond to increased climate variability. In the first chapter, we show that the unique behavior of Helheim Glacier in East Greenland is driven primarily by atmospheric, not ocean variability. In the second chapter, we address the role of glacier geometry in modulating decadal-scale dynamics of Greenland glaciers. Our results show that, contrary to many assumptions, width and bed topography only play a small role in controlling mass loss during retreat. The third chapter focuses on the retreat of Byrd Glacier, East Antarctica from its grounding line during the Last Glacial Maximum (LGM), to its current configuration, under rising atmospheric and oceanic temperatures. We show that atmospheric changes are the primary driver for the retreat, and that the current geometry of the Ross Ice Shelf has been similar for the last 2,000 years. The results of this thesis increase our knowledge of Greenland and Antarctic glacier dynamics, their relationship with atmospheric and oceanic forcings, and their future contribution to sea-level. Τις τελευταίες δύο δεκαετίες, η απώλεια μάζας από τα στρώματα πάγου της Ανταρκτικής και της Γροιλανδίας έχει συνεισφέρει περίπου 11,2 +/- 3,8 mm στην παγκόσμια μέση στάθμη ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Byrd Glacier East Antarctica East Greenland glacier Greenland Ice Sheet Ice Shelf Ross Ice Shelf Tidewater National Archive of PhD Theses (National Documentation Centre Greece) Antarctic Byrd Byrd Glacier ENVELOPE(160.333,160.333,-80.250,-80.250) East Antarctica Greenland Ross Ice Shelf The Antarctic |