A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model
The Gravity and steady-state Ocean Circulation Explorer (GOCE) satellite mission measures Earth’s gravity field with an unprecedented accuracy at short spatial scales. In doing so, it promises to significantly advance our ability to determine the ocean’s general circulation. In this study, an initia...
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Online Access: | https://orbit.dtu.dk/en/publications/5f823101-a223-4eef-a6df-98395ef38ebe https://doi.org/10.1007/s00190-011-0485-8 |
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ftdtupubl:oai:pure.atira.dk:publications/5f823101-a223-4eef-a6df-98395ef38ebe 2024-04-28T08:02:44+00:00 A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model Knudsen, Per Bingham, R. Andersen, Ole Baltazar Rio, Marie-Helene 2011 https://orbit.dtu.dk/en/publications/5f823101-a223-4eef-a6df-98395ef38ebe https://doi.org/10.1007/s00190-011-0485-8 eng eng https://orbit.dtu.dk/en/publications/5f823101-a223-4eef-a6df-98395ef38ebe info:eu-repo/semantics/closedAccess Knudsen , P , Bingham , R , Andersen , O B & Rio , M-H 2011 , ' A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model ' , Journal of Geodesy , vol. 85 , no. 11 , pp. 861-879 . https://doi.org/10.1007/s00190-011-0485-8 GOCE Dynamic ocean topography Ocean circulation Altimetry article 2011 ftdtupubl https://doi.org/10.1007/s00190-011-0485-8 2024-04-03T14:59:51Z The Gravity and steady-state Ocean Circulation Explorer (GOCE) satellite mission measures Earth’s gravity field with an unprecedented accuracy at short spatial scales. In doing so, it promises to significantly advance our ability to determine the ocean’s general circulation. In this study, an initial gravity model from GOCE, based on just 2 months of data, is combined with the recent DTU10MSS mean sea surface to construct a global mean dynamic topography (MDT) model. The GOCE MDT clearly displays the gross features of the ocean’s steady-state circulation. More significantly, the improved gravity model provided by the GOCE mission has enhanced the resolution and sharpened the boundaries of those features compared with earlier satellite only solutions. Calculation of the geostrophic surface currents from the MDT reveals improvements for all of the ocean’s major current systems. In the North Atlantic, the Gulf Stream is stronger and more clearly defined, as are the Labrador and the Greenland currents. Furthermore, the finer scale features, such as eddies,meanders and branches of theGulf Stream and North Atlantic Current system are visible. Similar improvements are seen also in the North Pacific Ocean, where the Kuroshio and its extension are well represented. In the Southern hemisphere, both the Agulhas and the Brazil-Malvinas Confluence current systems are well defined, and in the Southern ocean the Antarctic Circumpolar Current appears enhanced. The results of this preliminary analysis, using an initial GOCE gravity model, clearly demonstrate the potential of the GOCE mission. Already, at this early stage of the mission, the resolution of the MDT has been improved and the estimated surface current speeds have been increased compared with a GRACE satellite-only MDT. Future GOCE gravity models are expected to build further upon this early success. Article in Journal/Newspaper Antarc* Antarctic Greenland north atlantic current North Atlantic Southern Ocean Technical University of Denmark: DTU Orbit Journal of Geodesy 85 11 861 879 |
institution |
Open Polar |
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Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
GOCE Dynamic ocean topography Ocean circulation Altimetry |
spellingShingle |
GOCE Dynamic ocean topography Ocean circulation Altimetry Knudsen, Per Bingham, R. Andersen, Ole Baltazar Rio, Marie-Helene A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model |
topic_facet |
GOCE Dynamic ocean topography Ocean circulation Altimetry |
description |
The Gravity and steady-state Ocean Circulation Explorer (GOCE) satellite mission measures Earth’s gravity field with an unprecedented accuracy at short spatial scales. In doing so, it promises to significantly advance our ability to determine the ocean’s general circulation. In this study, an initial gravity model from GOCE, based on just 2 months of data, is combined with the recent DTU10MSS mean sea surface to construct a global mean dynamic topography (MDT) model. The GOCE MDT clearly displays the gross features of the ocean’s steady-state circulation. More significantly, the improved gravity model provided by the GOCE mission has enhanced the resolution and sharpened the boundaries of those features compared with earlier satellite only solutions. Calculation of the geostrophic surface currents from the MDT reveals improvements for all of the ocean’s major current systems. In the North Atlantic, the Gulf Stream is stronger and more clearly defined, as are the Labrador and the Greenland currents. Furthermore, the finer scale features, such as eddies,meanders and branches of theGulf Stream and North Atlantic Current system are visible. Similar improvements are seen also in the North Pacific Ocean, where the Kuroshio and its extension are well represented. In the Southern hemisphere, both the Agulhas and the Brazil-Malvinas Confluence current systems are well defined, and in the Southern ocean the Antarctic Circumpolar Current appears enhanced. The results of this preliminary analysis, using an initial GOCE gravity model, clearly demonstrate the potential of the GOCE mission. Already, at this early stage of the mission, the resolution of the MDT has been improved and the estimated surface current speeds have been increased compared with a GRACE satellite-only MDT. Future GOCE gravity models are expected to build further upon this early success. |
format |
Article in Journal/Newspaper |
author |
Knudsen, Per Bingham, R. Andersen, Ole Baltazar Rio, Marie-Helene |
author_facet |
Knudsen, Per Bingham, R. Andersen, Ole Baltazar Rio, Marie-Helene |
author_sort |
Knudsen, Per |
title |
A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model |
title_short |
A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model |
title_full |
A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model |
title_fullStr |
A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model |
title_full_unstemmed |
A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model |
title_sort |
global mean dynamic topography and ocean circulation estimation using a preliminary goce gravity model |
publishDate |
2011 |
url |
https://orbit.dtu.dk/en/publications/5f823101-a223-4eef-a6df-98395ef38ebe https://doi.org/10.1007/s00190-011-0485-8 |
genre |
Antarc* Antarctic Greenland north atlantic current North Atlantic Southern Ocean |
genre_facet |
Antarc* Antarctic Greenland north atlantic current North Atlantic Southern Ocean |
op_source |
Knudsen , P , Bingham , R , Andersen , O B & Rio , M-H 2011 , ' A global mean dynamic topography and ocean circulation estimation using a preliminary GOCE gravity model ' , Journal of Geodesy , vol. 85 , no. 11 , pp. 861-879 . https://doi.org/10.1007/s00190-011-0485-8 |
op_relation |
https://orbit.dtu.dk/en/publications/5f823101-a223-4eef-a6df-98395ef38ebe |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1007/s00190-011-0485-8 |
container_title |
Journal of Geodesy |
container_volume |
85 |
container_issue |
11 |
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861 |
op_container_end_page |
879 |
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1797574028389515264 |