Optimal locations for GPS measurements in North America and northern Europe for constraining Glacial Isostatic Adjustment
We determine the optimal location in North America and Fennoscandia for uplift rate or tangential velocity data that will be useful for addressing ice sheet thickness, lithospheric thickness, lateral viscosity variation and background viscosity profile in the lower mantle. An optimal location is def...
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fthighwire:oai:open-archive.highwire.org:gji:181/2/653 2023-05-15T16:11:46+02:00 Optimal locations for GPS measurements in North America and northern Europe for constraining Glacial Isostatic Adjustment Wu, Patrick Steffen, Holger Wang, Hansheng 2010-05-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/181/2/653 https://doi.org/10.1111/j.1365-246X.2010.04545.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/181/2/653 http://dx.doi.org/10.1111/j.1365-246X.2010.04545.x Copyright (C) 2010, Oxford University Press Geodynamics and Tectonics TEXT 2010 fthighwire https://doi.org/10.1111/j.1365-246X.2010.04545.x 2016-11-16T18:41:13Z We determine the optimal location in North America and Fennoscandia for uplift rate or tangential velocity data that will be useful for addressing ice sheet thickness, lithospheric thickness, lateral viscosity variation and background viscosity profile in the lower mantle. An optimal location is defined by where sensitivity lies above the current accuracy of GPS measurements. The approach here is different from previous studies that compute sensitivity kernels for viscosity perturbations within a small volume of the mantle. The advantage of the current approach is that the total effect of 3-D lateral heterogeneity in the mantle related to seismic tomography of the whole mantle can be studied. The sensitivity of ice sheet models and lateral lithospheric thickness variations are also studied. Our results show that in North America more permanent GPS stations are needed in northern Canada especially in a region west of the Hudson Bay until the Rocky Mountains. In Fennoscandia, the GPS network is almost adequate, but it should be extended to the last known GIA-affected areas in the Russian part of East Europe and to Central Europe. In addition, we show locations of prospective GPS sites that are sensitive to all four parameters (ice sheet thickness, lithospheric thickness, lateral viscosity variation and background viscosity profile in the lower mantle) and locations that are sensitive to only one, two or three parameters. Thus, the results are useful for the inversion of one individual parameter or for the separation of the effects of two or more parameters in inversions. Text Fennoscandia Hudson Bay Ice Sheet HighWire Press (Stanford University) Canada Hudson Hudson Bay Geophysical Journal International |
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Open Polar |
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HighWire Press (Stanford University) |
op_collection_id |
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language |
English |
topic |
Geodynamics and Tectonics |
spellingShingle |
Geodynamics and Tectonics Wu, Patrick Steffen, Holger Wang, Hansheng Optimal locations for GPS measurements in North America and northern Europe for constraining Glacial Isostatic Adjustment |
topic_facet |
Geodynamics and Tectonics |
description |
We determine the optimal location in North America and Fennoscandia for uplift rate or tangential velocity data that will be useful for addressing ice sheet thickness, lithospheric thickness, lateral viscosity variation and background viscosity profile in the lower mantle. An optimal location is defined by where sensitivity lies above the current accuracy of GPS measurements. The approach here is different from previous studies that compute sensitivity kernels for viscosity perturbations within a small volume of the mantle. The advantage of the current approach is that the total effect of 3-D lateral heterogeneity in the mantle related to seismic tomography of the whole mantle can be studied. The sensitivity of ice sheet models and lateral lithospheric thickness variations are also studied. Our results show that in North America more permanent GPS stations are needed in northern Canada especially in a region west of the Hudson Bay until the Rocky Mountains. In Fennoscandia, the GPS network is almost adequate, but it should be extended to the last known GIA-affected areas in the Russian part of East Europe and to Central Europe. In addition, we show locations of prospective GPS sites that are sensitive to all four parameters (ice sheet thickness, lithospheric thickness, lateral viscosity variation and background viscosity profile in the lower mantle) and locations that are sensitive to only one, two or three parameters. Thus, the results are useful for the inversion of one individual parameter or for the separation of the effects of two or more parameters in inversions. |
format |
Text |
author |
Wu, Patrick Steffen, Holger Wang, Hansheng |
author_facet |
Wu, Patrick Steffen, Holger Wang, Hansheng |
author_sort |
Wu, Patrick |
title |
Optimal locations for GPS measurements in North America and northern Europe for constraining Glacial Isostatic Adjustment |
title_short |
Optimal locations for GPS measurements in North America and northern Europe for constraining Glacial Isostatic Adjustment |
title_full |
Optimal locations for GPS measurements in North America and northern Europe for constraining Glacial Isostatic Adjustment |
title_fullStr |
Optimal locations for GPS measurements in North America and northern Europe for constraining Glacial Isostatic Adjustment |
title_full_unstemmed |
Optimal locations for GPS measurements in North America and northern Europe for constraining Glacial Isostatic Adjustment |
title_sort |
optimal locations for gps measurements in north america and northern europe for constraining glacial isostatic adjustment |
publisher |
Oxford University Press |
publishDate |
2010 |
url |
http://gji.oxfordjournals.org/cgi/content/short/181/2/653 https://doi.org/10.1111/j.1365-246X.2010.04545.x |
geographic |
Canada Hudson Hudson Bay |
geographic_facet |
Canada Hudson Hudson Bay |
genre |
Fennoscandia Hudson Bay Ice Sheet |
genre_facet |
Fennoscandia Hudson Bay Ice Sheet |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/181/2/653 http://dx.doi.org/10.1111/j.1365-246X.2010.04545.x |
op_rights |
Copyright (C) 2010, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.2010.04545.x |
container_title |
Geophysical Journal International |
_version_ |
1765996940652183552 |