Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2
International audience This study focuses on the improved estimation of mesoscale surface ocean circulation obtained by merging TOPEX/Poseidon (T/P) and ERS-1 and -2 altimeter measurements between October 1992 and May 1998. Once carefully intercalibrated and homogenized, these data are merged throug...
Published in: | Journal of Geophysical Research: Oceans |
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ftceafr:oai:HAL:hal-00772161v1 2023-05-15T17:36:54+02:00 Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2 Ducet, N. Le Traon, Pierre-Yves Reverdin, Gilles Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 2000-08 https://hal.science/hal-00772161 https://hal.science/hal-00772161/document https://hal.science/hal-00772161/file/2000JC900063.pdf https://doi.org/10.1029/2000JC900063 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2000JC900063 hal-00772161 https://hal.science/hal-00772161 https://hal.science/hal-00772161/document https://hal.science/hal-00772161/file/2000JC900063.pdf BIBCODE: 2000JGR.10519477D doi:10.1029/2000JC900063 info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00772161 Journal of Geophysical Research, 2000, 105, pp.19477-19498. ⟨10.1029/2000JC900063⟩ Oceanography: General Oceanography: Physical [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2000 ftceafr https://doi.org/10.1029/2000JC900063 2023-01-18T17:28:48Z International audience This study focuses on the improved estimation of mesoscale surface ocean circulation obtained by merging TOPEX/Poseidon (T/P) and ERS-1 and -2 altimeter measurements between October 1992 and May 1998. Once carefully intercalibrated and homogenized, these data are merged through an advanced global objective analysis method that allows us to correct for residual long wavelength errors and uses realistic correlation scales of ocean dynamics. The high-resolution (0.25°×0.25°) merged T/P+ERS-1 and -2 sea level anomaly maps provide more homogeneous and reduced mapping errors than either individual data set and more realistic sea level and geostrophic velocity statistics than T/P data alone. Furthermore, the merged T/P+ERS-1 and -2 maps yield eddy kinetic energy (EKE) levels 30% higher than maps of T/P alone. They also permit realistic global estimates of east and north components of EKE and their seasonal variations, to study EKE sources better. A comparison of velocity statistics with World Ocean Circulation Experiment surface drifters in the North Atlantic shows very good agreement. Comparison with contemporary current meter data in various oceanic regimes also produces comparable levels of energy and similar ratios of northward and eastward energy, showing that the maps are suitable to studying anisotropy. The T/P+ERS zonal and meridional components of the mapped currents usually present comparable rms variability, even though the variability in the Atlantic is more isotropic than that in the Pacific, which exhibits strong zonal changes. The EKE map presents a very detailed description, presumably never before achieved at a global scale. Pronounced seasonal changes of the EKE are found in many regions, notably the northeastern Pacific, the northeastern and northwestern Atlantic, the tropical oceans, and the zonally extended bands centered near 20°S in the Indian and western Pacific Oceans and at 20°N in the northwestern Pacific. Article in Journal/Newspaper North Atlantic HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) Indian Pacific Journal of Geophysical Research: Oceans 105 C8 19477 19498 |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
English |
topic |
Oceanography: General Oceanography: Physical [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Oceanography: General Oceanography: Physical [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Ducet, N. Le Traon, Pierre-Yves Reverdin, Gilles Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2 |
topic_facet |
Oceanography: General Oceanography: Physical [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience This study focuses on the improved estimation of mesoscale surface ocean circulation obtained by merging TOPEX/Poseidon (T/P) and ERS-1 and -2 altimeter measurements between October 1992 and May 1998. Once carefully intercalibrated and homogenized, these data are merged through an advanced global objective analysis method that allows us to correct for residual long wavelength errors and uses realistic correlation scales of ocean dynamics. The high-resolution (0.25°×0.25°) merged T/P+ERS-1 and -2 sea level anomaly maps provide more homogeneous and reduced mapping errors than either individual data set and more realistic sea level and geostrophic velocity statistics than T/P data alone. Furthermore, the merged T/P+ERS-1 and -2 maps yield eddy kinetic energy (EKE) levels 30% higher than maps of T/P alone. They also permit realistic global estimates of east and north components of EKE and their seasonal variations, to study EKE sources better. A comparison of velocity statistics with World Ocean Circulation Experiment surface drifters in the North Atlantic shows very good agreement. Comparison with contemporary current meter data in various oceanic regimes also produces comparable levels of energy and similar ratios of northward and eastward energy, showing that the maps are suitable to studying anisotropy. The T/P+ERS zonal and meridional components of the mapped currents usually present comparable rms variability, even though the variability in the Atlantic is more isotropic than that in the Pacific, which exhibits strong zonal changes. The EKE map presents a very detailed description, presumably never before achieved at a global scale. Pronounced seasonal changes of the EKE are found in many regions, notably the northeastern Pacific, the northeastern and northwestern Atlantic, the tropical oceans, and the zonally extended bands centered near 20°S in the Indian and western Pacific Oceans and at 20°N in the northwestern Pacific. |
author2 |
Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Ducet, N. Le Traon, Pierre-Yves Reverdin, Gilles |
author_facet |
Ducet, N. Le Traon, Pierre-Yves Reverdin, Gilles |
author_sort |
Ducet, N. |
title |
Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2 |
title_short |
Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2 |
title_full |
Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2 |
title_fullStr |
Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2 |
title_full_unstemmed |
Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2 |
title_sort |
global high-resolution mapping of ocean circulation from topex/poseidon and ers-1 and -2 |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00772161 https://hal.science/hal-00772161/document https://hal.science/hal-00772161/file/2000JC900063.pdf https://doi.org/10.1029/2000JC900063 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00772161 Journal of Geophysical Research, 2000, 105, pp.19477-19498. ⟨10.1029/2000JC900063⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2000JC900063 hal-00772161 https://hal.science/hal-00772161 https://hal.science/hal-00772161/document https://hal.science/hal-00772161/file/2000JC900063.pdf BIBCODE: 2000JGR.10519477D doi:10.1029/2000JC900063 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2000JC900063 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
105 |
container_issue |
C8 |
container_start_page |
19477 |
op_container_end_page |
19498 |
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1766136541297508352 |