On-land ice loss and glacial isostatic adjustment at the Drake Passage: 2003–2009
Land glacier extent and volume at the northern and southern margins of the Drake Passage have been in a state of dramatic demise since the early 1990s. Here time-varying space gravity observations from the Gravity Recovery and Climate Experiment (GRACE) are combined with Global Positioning System (G...
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ftcaltechauth:oai:authors.library.caltech.edu:6eby8-t4h41 2024-09-15T17:44:17+00:00 On-land ice loss and glacial isostatic adjustment at the Drake Passage: 2003–2009 Ivins, Erik R. Watkins, Michael M. Yuan, Dah-Ning Dietrich, Reinhard Casassa, Gino Rülke, Axel 2011-02-07 https://doi.org/10.1029/2010jb007607 unknown American Geophysical Union https://doi.org/10.1029/2010JB007607 oai:authors.library.caltech.edu:6eby8-t4h41 eprintid:119703 resolverid:CaltechAUTHORS:20230307-22142000.27 info:eu-repo/semantics/openAccess Other Journal of Geophysical Research D, 116(B2), Art. No. B02403, (2011-02-07) Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics info:eu-repo/semantics/article 2011 ftcaltechauth https://doi.org/10.1029/2010jb00760710.1029/2010JB007607 2024-08-06T15:35:01Z Land glacier extent and volume at the northern and southern margins of the Drake Passage have been in a state of dramatic demise since the early 1990s. Here time-varying space gravity observations from the Gravity Recovery and Climate Experiment (GRACE) are combined with Global Positioning System (GPS) bedrock uplift data to simultaneously solve for ice loss and for solid Earth glacial isostatic adjustment (GIA) to Little Ice Age (LIA) cryospheric loading. The present-day ice loss rates are determined to be −26 ± 6 Gt/yr and −41.5 ± 9 Gt/yr in the Southern and Northern Patagonia Ice Fields (NPI+SPI) and Antarctic Peninsula (AP), respectively. These are consistent with estimates based upon thickness and flux changes. Bounds are recovered for elastic lithosphere thicknesses of 35 ≤ h ≤ 70 km and 20 ≤ h ≤ 45 km and for upper mantle viscosities of 4–8 × 10¹⸠Pa s and 3–10 × 10¹⹠Pa s (using a half-space approximation) for NPI+SPI and AP, respectively, using an iterative forward model strategy. Antarctic Peninsula ice models with a prolonged LIA, extending to A.D. 1930, are favored in all χ² fits to the GPS uplift data. This result is largely decoupled from Earth structure assumptions. The GIA corrections account for roughly 20–60% of the space-determined secular gravity change. Collectively, the on-land ice losses correspond to volume increases of the oceans equivalent to 0.19 ± 0.045 mm/yr of sea level rise for the last 15 years. This research was supported by NASA's Earth Surface and Interior Focus Area as part of the GRACE Science Team effort and was performed at the Jet Propulsion Laboratory, California Institute of Technology. Parts of this research were supported by the International Bureau of the BMBF (Germany) and by the Chilean Government through the Millennium Science Initiative and the Centers of Excellence Base Financing Program of Conicyt which fund and the Centro de Estudios CientÃficos (CECS). We thank Michael Bentley, David Bromwich, Ben Chao, Eugene Domack, Tom James, ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Drake Passage Land Glacier Caltech Authors (California Institute of Technology) |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
spellingShingle |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics Ivins, Erik R. Watkins, Michael M. Yuan, Dah-Ning Dietrich, Reinhard Casassa, Gino Rülke, Axel On-land ice loss and glacial isostatic adjustment at the Drake Passage: 2003–2009 |
topic_facet |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
description |
Land glacier extent and volume at the northern and southern margins of the Drake Passage have been in a state of dramatic demise since the early 1990s. Here time-varying space gravity observations from the Gravity Recovery and Climate Experiment (GRACE) are combined with Global Positioning System (GPS) bedrock uplift data to simultaneously solve for ice loss and for solid Earth glacial isostatic adjustment (GIA) to Little Ice Age (LIA) cryospheric loading. The present-day ice loss rates are determined to be −26 ± 6 Gt/yr and −41.5 ± 9 Gt/yr in the Southern and Northern Patagonia Ice Fields (NPI+SPI) and Antarctic Peninsula (AP), respectively. These are consistent with estimates based upon thickness and flux changes. Bounds are recovered for elastic lithosphere thicknesses of 35 ≤ h ≤ 70 km and 20 ≤ h ≤ 45 km and for upper mantle viscosities of 4–8 × 10¹⸠Pa s and 3–10 × 10¹⹠Pa s (using a half-space approximation) for NPI+SPI and AP, respectively, using an iterative forward model strategy. Antarctic Peninsula ice models with a prolonged LIA, extending to A.D. 1930, are favored in all χ² fits to the GPS uplift data. This result is largely decoupled from Earth structure assumptions. The GIA corrections account for roughly 20–60% of the space-determined secular gravity change. Collectively, the on-land ice losses correspond to volume increases of the oceans equivalent to 0.19 ± 0.045 mm/yr of sea level rise for the last 15 years. This research was supported by NASA's Earth Surface and Interior Focus Area as part of the GRACE Science Team effort and was performed at the Jet Propulsion Laboratory, California Institute of Technology. Parts of this research were supported by the International Bureau of the BMBF (Germany) and by the Chilean Government through the Millennium Science Initiative and the Centers of Excellence Base Financing Program of Conicyt which fund and the Centro de Estudios CientÃficos (CECS). We thank Michael Bentley, David Bromwich, Ben Chao, Eugene Domack, Tom James, ... |
format |
Article in Journal/Newspaper |
author |
Ivins, Erik R. Watkins, Michael M. Yuan, Dah-Ning Dietrich, Reinhard Casassa, Gino Rülke, Axel |
author_facet |
Ivins, Erik R. Watkins, Michael M. Yuan, Dah-Ning Dietrich, Reinhard Casassa, Gino Rülke, Axel |
author_sort |
Ivins, Erik R. |
title |
On-land ice loss and glacial isostatic adjustment at the Drake Passage: 2003–2009 |
title_short |
On-land ice loss and glacial isostatic adjustment at the Drake Passage: 2003–2009 |
title_full |
On-land ice loss and glacial isostatic adjustment at the Drake Passage: 2003–2009 |
title_fullStr |
On-land ice loss and glacial isostatic adjustment at the Drake Passage: 2003–2009 |
title_full_unstemmed |
On-land ice loss and glacial isostatic adjustment at the Drake Passage: 2003–2009 |
title_sort |
on-land ice loss and glacial isostatic adjustment at the drake passage: 2003–2009 |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
https://doi.org/10.1029/2010jb007607 |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage Land Glacier |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage Land Glacier |
op_source |
Journal of Geophysical Research D, 116(B2), Art. No. B02403, (2011-02-07) |
op_relation |
https://doi.org/10.1029/2010JB007607 oai:authors.library.caltech.edu:6eby8-t4h41 eprintid:119703 resolverid:CaltechAUTHORS:20230307-22142000.27 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/2010jb00760710.1029/2010JB007607 |
_version_ |
1810491728946266112 |