Present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling
This work is concerned with the determination of present-day ice-mass changes and glacial-isostatic adjustment (GIA) in the polar regions from gravity-field data of the satellite mission Gravity Recovery and Climate Experiment (GRACE). Aim is the separation of cryospheric mass changes from the mass...
Main Author: | |
---|---|
Other Authors: | , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
2009
|
Subjects: | |
Online Access: | https://refubium.fu-berlin.de/handle/fub188/7376 https://doi.org/10.17169/refubium-11575 https://nbn-resolving.org/urn:nbn:de:kobv:188-fudissthesis000000013564-8 |
id |
ftfuberlin:oai:refubium.fu-berlin.de:fub188/7376 |
---|---|
record_format |
openpolar |
spelling |
ftfuberlin:oai:refubium.fu-berlin.de:fub188/7376 2023-05-15T13:50:49+02:00 Present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling Die Bestimmung der rezenten Eismassenänderung und der glazialisostatischen Anpassung in den Polarregionen durch Satellitengravimetrie und geophysikalische Modellierung Sasgen, Ingo sasgen@gfz-potsdam.de n Prof. Dr. Maik Thomas Prof. Dr. Zdenek Martinec 2009 173 S. application/pdf https://refubium.fu-berlin.de/handle/fub188/7376 https://doi.org/10.17169/refubium-11575 https://nbn-resolving.org/urn:nbn:de:kobv:188-fudissthesis000000013564-8 eng eng https://refubium.fu-berlin.de/handle/fub188/7376 http://dx.doi.org/10.17169/refubium-11575 urn:nbn:de:kobv:188-fudissthesis000000013564-8 http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen Polar Regions Antarctica GRACE Glacial-isostatic adjustment Sea-level change ddc:550 doc-type:doctoralThesis 2009 ftfuberlin https://doi.org/10.17169/refubium-11575 2022-05-15T20:45:04Z This work is concerned with the determination of present-day ice-mass changes and glacial-isostatic adjustment (GIA) in the polar regions from gravity-field data of the satellite mission Gravity Recovery and Climate Experiment (GRACE). Aim is the separation of cryospheric mass changes from the mass redistribution in the Earth’s mantle due to GIA using geophysical modelling and the determination of the contribution of glaciated areas to global sea-level change. This is done by analyzing the time series of monthly GRACE gravity- field solutions with respect to their long-term temporal changes. Filters are developed to optimize the trade-off between noise and spatial resolution in the GRACE gravity fields. Also, a method for the evaluation and combination of GRACE gravity fields from different processing is developed. Forward models of the potential disturbance due to present-day ice-mass changes and GIA are adjusted with respect to the GRACE observations and then used to perform a joint gravity-field inversion for the causative mass changes on and within the Earth. For small spatial scales (e.g. individual drainage basins of glaciers), ambiguities in the solution of this gravimetric inverse problem are reduced by introducing a priori constraints. The relative weight of this information with respect to the GRACE data allows determining the regional spatial resolution of the long-term changes in the GRACE gravity fields. The main region of interest of this work is Antarctica. In addition, investigations concerned with present-day ice-mass changes in Alaska and Greenland are presented, along with results on the gravity-field inversion in terms of the viscosity distribution in the Earth’s mantle under North America. Diese Arbeit beschäftigt sich mit der Bestimmung rezenter Eismassenänderungen und der glazialisostatischen Anpassung (GIA) in den Polarregionen aus den Schwerefelddaten der Satellitenmission Gravity Recovery and Climate Experiment (GRACE). Ziel ist es, die heutigen Massenänderungen in den Eisgebieten von ... Doctoral or Postdoctoral Thesis Antarc* Antarctica glaciers Greenland Alaska Freie Universität Berlin: Refubium (FU Berlin) Greenland |
institution |
Open Polar |
collection |
Freie Universität Berlin: Refubium (FU Berlin) |
op_collection_id |
ftfuberlin |
language |
English |
topic |
Polar Regions Antarctica GRACE Glacial-isostatic adjustment Sea-level change ddc:550 |
spellingShingle |
Polar Regions Antarctica GRACE Glacial-isostatic adjustment Sea-level change ddc:550 Sasgen, Ingo Present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling |
topic_facet |
Polar Regions Antarctica GRACE Glacial-isostatic adjustment Sea-level change ddc:550 |
description |
This work is concerned with the determination of present-day ice-mass changes and glacial-isostatic adjustment (GIA) in the polar regions from gravity-field data of the satellite mission Gravity Recovery and Climate Experiment (GRACE). Aim is the separation of cryospheric mass changes from the mass redistribution in the Earth’s mantle due to GIA using geophysical modelling and the determination of the contribution of glaciated areas to global sea-level change. This is done by analyzing the time series of monthly GRACE gravity- field solutions with respect to their long-term temporal changes. Filters are developed to optimize the trade-off between noise and spatial resolution in the GRACE gravity fields. Also, a method for the evaluation and combination of GRACE gravity fields from different processing is developed. Forward models of the potential disturbance due to present-day ice-mass changes and GIA are adjusted with respect to the GRACE observations and then used to perform a joint gravity-field inversion for the causative mass changes on and within the Earth. For small spatial scales (e.g. individual drainage basins of glaciers), ambiguities in the solution of this gravimetric inverse problem are reduced by introducing a priori constraints. The relative weight of this information with respect to the GRACE data allows determining the regional spatial resolution of the long-term changes in the GRACE gravity fields. The main region of interest of this work is Antarctica. In addition, investigations concerned with present-day ice-mass changes in Alaska and Greenland are presented, along with results on the gravity-field inversion in terms of the viscosity distribution in the Earth’s mantle under North America. Diese Arbeit beschäftigt sich mit der Bestimmung rezenter Eismassenänderungen und der glazialisostatischen Anpassung (GIA) in den Polarregionen aus den Schwerefelddaten der Satellitenmission Gravity Recovery and Climate Experiment (GRACE). Ziel ist es, die heutigen Massenänderungen in den Eisgebieten von ... |
author2 |
sasgen@gfz-potsdam.de n Prof. Dr. Maik Thomas Prof. Dr. Zdenek Martinec |
format |
Doctoral or Postdoctoral Thesis |
author |
Sasgen, Ingo |
author_facet |
Sasgen, Ingo |
author_sort |
Sasgen, Ingo |
title |
Present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling |
title_short |
Present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling |
title_full |
Present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling |
title_fullStr |
Present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling |
title_full_unstemmed |
Present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling |
title_sort |
present-day ice-mass change and glacial-isostatic adjustment in the polar regions from satellite gravimetry and geophysical modelling |
publishDate |
2009 |
url |
https://refubium.fu-berlin.de/handle/fub188/7376 https://doi.org/10.17169/refubium-11575 https://nbn-resolving.org/urn:nbn:de:kobv:188-fudissthesis000000013564-8 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica glaciers Greenland Alaska |
genre_facet |
Antarc* Antarctica glaciers Greenland Alaska |
op_relation |
https://refubium.fu-berlin.de/handle/fub188/7376 http://dx.doi.org/10.17169/refubium-11575 urn:nbn:de:kobv:188-fudissthesis000000013564-8 |
op_rights |
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen |
op_doi |
https://doi.org/10.17169/refubium-11575 |
_version_ |
1766254103261872128 |