Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns
Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 110 (2005): C09001, doi:10.1029/2004JC002772. The Gravity Reco...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/3608 2023-05-15T17:45:46+02:00 Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns Kanzow, Torsten Flechtner, Frank Chave, Alan D. Schmidt, Roland Schwintzer, Peter Send, Uwe 2005-09-02 application/pdf https://hdl.handle.net/1912/3608 en_US eng American Geophysical Union https://doi.org/10.1029/2004JC002772 Journal of Geophysical Research 110 (2005): C09001 https://hdl.handle.net/1912/3608 doi:10.1029/2004JC002772 Journal of Geophysical Research 110 (2005): C09001 doi:10.1029/2004JC002772 Gravity Geoid Ocean bottom pressure Deep ocean currents Ocean tides In situ measurements Article 2005 ftwhoas https://doi.org/10.1029/2004JC002772 2022-05-28T22:58:00Z Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 110 (2005): C09001, doi:10.1029/2004JC002772. The Gravity Recovery and Climate Experiment (GRACE) processing centers at the GeoForschungsZentrum Potsdam (GFZ) and the University of Texas Center for Space Research (UTCSR) provide time series of monthly gravity field solutions covering the period since mission launch in March 2002. Although the achieved accuracy still remains an order of magnitude below the mission's baseline goal, these time series have successfully been used to study terrestrial phenomena such as water storage variations. Over the oceans, the monthly gravity field solutions can be converted into estimates of the fluctuating ocean bottom pressure (OBP), which is the sum of atmospheric and oceanic mass variations. The GRACE products may be validated against in situ OBP observations which are available from a ground truth site in the tropical northwest Atlantic Ocean. Large differences are observed between the in situ and GRACE-derived OBP which are investigated by comparing the tidal and nontidal ocean models used at GFZ and UTCSR for dealiasing short-term (<2 months) mass variations from satellite measurements. Results show that the barotropic nontidal and tide models need improvement at periods shorter than 1 day and longer than 2 weeks. On a global scale the monthly OBP fields from GRACE generally overestimate the variability compared to ocean general circulation models, especially in tropical regions. This may be attributed to continuing deficiencies in GRACE data processing. Nevertheless, there is some initial evidence that GRACE possesses the potential to observe large-scale averages of bottom pressure fluctuations. The German Ministry of Education and Research (BMBF) supports the GRACE Science Data System at GFZ within the Geotechnologien ... Article in Journal/Newspaper Northwest Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Geophysical Research 110 C9 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Gravity Geoid Ocean bottom pressure Deep ocean currents Ocean tides In situ measurements |
spellingShingle |
Gravity Geoid Ocean bottom pressure Deep ocean currents Ocean tides In situ measurements Kanzow, Torsten Flechtner, Frank Chave, Alan D. Schmidt, Roland Schwintzer, Peter Send, Uwe Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns |
topic_facet |
Gravity Geoid Ocean bottom pressure Deep ocean currents Ocean tides In situ measurements |
description |
Author Posting. © American Geophysical Union, 2005. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 110 (2005): C09001, doi:10.1029/2004JC002772. The Gravity Recovery and Climate Experiment (GRACE) processing centers at the GeoForschungsZentrum Potsdam (GFZ) and the University of Texas Center for Space Research (UTCSR) provide time series of monthly gravity field solutions covering the period since mission launch in March 2002. Although the achieved accuracy still remains an order of magnitude below the mission's baseline goal, these time series have successfully been used to study terrestrial phenomena such as water storage variations. Over the oceans, the monthly gravity field solutions can be converted into estimates of the fluctuating ocean bottom pressure (OBP), which is the sum of atmospheric and oceanic mass variations. The GRACE products may be validated against in situ OBP observations which are available from a ground truth site in the tropical northwest Atlantic Ocean. Large differences are observed between the in situ and GRACE-derived OBP which are investigated by comparing the tidal and nontidal ocean models used at GFZ and UTCSR for dealiasing short-term (<2 months) mass variations from satellite measurements. Results show that the barotropic nontidal and tide models need improvement at periods shorter than 1 day and longer than 2 weeks. On a global scale the monthly OBP fields from GRACE generally overestimate the variability compared to ocean general circulation models, especially in tropical regions. This may be attributed to continuing deficiencies in GRACE data processing. Nevertheless, there is some initial evidence that GRACE possesses the potential to observe large-scale averages of bottom pressure fluctuations. The German Ministry of Education and Research (BMBF) supports the GRACE Science Data System at GFZ within the Geotechnologien ... |
format |
Article in Journal/Newspaper |
author |
Kanzow, Torsten Flechtner, Frank Chave, Alan D. Schmidt, Roland Schwintzer, Peter Send, Uwe |
author_facet |
Kanzow, Torsten Flechtner, Frank Chave, Alan D. Schmidt, Roland Schwintzer, Peter Send, Uwe |
author_sort |
Kanzow, Torsten |
title |
Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns |
title_short |
Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns |
title_full |
Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns |
title_fullStr |
Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns |
title_full_unstemmed |
Seasonal variation of ocean bottom pressure derived from Gravity Recovery and Climate Experiment (GRACE) : local validation and global patterns |
title_sort |
seasonal variation of ocean bottom pressure derived from gravity recovery and climate experiment (grace) : local validation and global patterns |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
https://hdl.handle.net/1912/3608 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_source |
Journal of Geophysical Research 110 (2005): C09001 doi:10.1029/2004JC002772 |
op_relation |
https://doi.org/10.1029/2004JC002772 Journal of Geophysical Research 110 (2005): C09001 https://hdl.handle.net/1912/3608 doi:10.1029/2004JC002772 |
op_doi |
https://doi.org/10.1029/2004JC002772 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
C9 |
_version_ |
1766149010394972160 |