Monitoring Global Sea Level: Eustatic Variations, Local Variations, and Solid Earth Effects
Project BIFROST (Baseline Inferences for Fennoscandian Rebound Observations. Sea-level and Tectonics) combines networks of continuously operating CPS receivers in Sweden and Finland to measure ongoing crustal deformation due to glacial isostatic adjustment, (CIA). We present an analysis of data coll...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20010000324 2023-05-15T16:12:56+02:00 Monitoring Global Sea Level: Eustatic Variations, Local Variations, and Solid Earth Effects Davis, James L. Unclassified, Unlimited, Publicly available December 2000 application/pdf http://hdl.handle.net/2060/20010000324 unknown Document ID: 20010000324 http://hdl.handle.net/2060/20010000324 No Copyright CASI Oceanography 2000 ftnasantrs 2019-07-21T02:49:47Z Project BIFROST (Baseline Inferences for Fennoscandian Rebound Observations. Sea-level and Tectonics) combines networks of continuously operating CPS receivers in Sweden and Finland to measure ongoing crustal deformation due to glacial isostatic adjustment, (CIA). We present an analysis of data collected in the years 1993-1998. We compare the CPS determinations of three-dimensional crustal motion to predictions calculated using the high resolution Fennoscandian deglaciation model recently proposed by Lambeck et al. We find that the the maximum observed uplift rate (approx. 10 mm/ yr) and the maximum predicted uplift rate agree to better than 1 mm/ yr. The patterns of uplift also agree quite well, although differences are discernible. The chi(exp 2) difference between predicted and GPS-observed radial rates is reduced by a factor of 5-6 compared to that for the "null" (no uplift) model, depending on whether a mean difference is first removed. The north components of velocity agree at about the same relative level. whereas the agreement for the east components is worse, a problem possibly related to the lack of bias fixing. We have also compared the values for the observed radial deformation rates to those based on sea-level rates from Baltic tide gauges. The weighted RMS difference between CPS and tide-gauge rates (after removing a mean) is 0.6 mm/ yr, giving an indication of the combined accuracy of the CPS and tide-gauge measurement systems. Spectral analysis of the time series of position estimates yields spectral indices in the range -1 to -2. An EOF analysis indicates, however, that much of this power is correlated among the sites. The correlation appears to be regional and falls off only slightly with distance. Some of this correlated noise is associated with snow accumulation on the antennas or, for those antennas with radomes, on the radomes. This problem has caused us to modify the radomes used several times, leading to one of our more significant sources of uncertainty. Other/Unknown Material Fennoscandian NASA Technical Reports Server (NTRS) |
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Oceanography |
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Oceanography Davis, James L. Monitoring Global Sea Level: Eustatic Variations, Local Variations, and Solid Earth Effects |
topic_facet |
Oceanography |
description |
Project BIFROST (Baseline Inferences for Fennoscandian Rebound Observations. Sea-level and Tectonics) combines networks of continuously operating CPS receivers in Sweden and Finland to measure ongoing crustal deformation due to glacial isostatic adjustment, (CIA). We present an analysis of data collected in the years 1993-1998. We compare the CPS determinations of three-dimensional crustal motion to predictions calculated using the high resolution Fennoscandian deglaciation model recently proposed by Lambeck et al. We find that the the maximum observed uplift rate (approx. 10 mm/ yr) and the maximum predicted uplift rate agree to better than 1 mm/ yr. The patterns of uplift also agree quite well, although differences are discernible. The chi(exp 2) difference between predicted and GPS-observed radial rates is reduced by a factor of 5-6 compared to that for the "null" (no uplift) model, depending on whether a mean difference is first removed. The north components of velocity agree at about the same relative level. whereas the agreement for the east components is worse, a problem possibly related to the lack of bias fixing. We have also compared the values for the observed radial deformation rates to those based on sea-level rates from Baltic tide gauges. The weighted RMS difference between CPS and tide-gauge rates (after removing a mean) is 0.6 mm/ yr, giving an indication of the combined accuracy of the CPS and tide-gauge measurement systems. Spectral analysis of the time series of position estimates yields spectral indices in the range -1 to -2. An EOF analysis indicates, however, that much of this power is correlated among the sites. The correlation appears to be regional and falls off only slightly with distance. Some of this correlated noise is associated with snow accumulation on the antennas or, for those antennas with radomes, on the radomes. This problem has caused us to modify the radomes used several times, leading to one of our more significant sources of uncertainty. |
author |
Davis, James L. |
author_facet |
Davis, James L. |
author_sort |
Davis, James L. |
title |
Monitoring Global Sea Level: Eustatic Variations, Local Variations, and Solid Earth Effects |
title_short |
Monitoring Global Sea Level: Eustatic Variations, Local Variations, and Solid Earth Effects |
title_full |
Monitoring Global Sea Level: Eustatic Variations, Local Variations, and Solid Earth Effects |
title_fullStr |
Monitoring Global Sea Level: Eustatic Variations, Local Variations, and Solid Earth Effects |
title_full_unstemmed |
Monitoring Global Sea Level: Eustatic Variations, Local Variations, and Solid Earth Effects |
title_sort |
monitoring global sea level: eustatic variations, local variations, and solid earth effects |
publishDate |
2000 |
url |
http://hdl.handle.net/2060/20010000324 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
Fennoscandian |
genre_facet |
Fennoscandian |
op_source |
CASI |
op_relation |
Document ID: 20010000324 http://hdl.handle.net/2060/20010000324 |
op_rights |
No Copyright |
_version_ |
1765998539161206784 |