Comparing the results of a 4D-variational assimilation of satellite and in situ data with WOCE CITHER hydrographic measurements in the tropical Atlantic
Identifieur interne : 001900 ( Main/Exploration ); précédent : 001899; suivant : 001901Comparing the results of a 4D-variational assimilation of satellite and in situ data with WOCE CITHER hydrographic measurements in the tropical Atlantic
Auteurs : Eric Greiner [France] ; Sabine Arnault [France]Source :
- Progress in Oceanography [ 0079-6611 ] ; 2000.
Abstract
TOPEX/POSEÏDON and ERS1 sea level anomalies, expendable bathythermograph temperature profiles, sea surface salinities and satellite sea surface temperatures have been assimilated from November 1992 to October 1994 into a non-linear primitive equation model of the tropical Atlantic Ocean using a 4D-variational method. The model is forced monthly by ship winds and climatologies of heat and fresh water fluxes. The comparison between the model run both with and without assimilation is first analyzed in terms of empirical orthogonal functions, and along particular sections in the basin. The results are then compared with independent hydrological measurements obtained during the World Ocean Circulation Experiment cruise CITHER 1, in the tropical Atlantic Ocean in early 1993. The comparison is improved globally with assimilation. The largest impact of the assimilation appears in the North Equatorial Counter Current and the North Equatorial Current (5°N–15°N). Sub-surface thermocline motions were not reproduced by the model alone, but, are clearly depicted in the assimilation results along 7°30′N and are in good agreement with the CITHER 1 data. Considerations about the assimilation technique, the model and the forcing data sets are also discussed via this independent validation.
Url:
DOI: 10.1016/S0079-6611(00)00031-8
Affiliations:
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Edouard Belin, 31401 Toulouse cedex</wicri:regionArea><placeName><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation><affiliation></affiliation></author><author><name sortKey="Arnault, Sabine" sort="Arnault, Sabine" uniqKey="Arnault S" first="Sabine" last="Arnault">Sabine Arnault</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>LODYC, UMR 7617 CNRS/UPMC/IRD, Tour 14, 2eme, case 100, 4 place Jussieu, 75252 Paris cedex 05</wicri:regionArea><placeName><region type="region" nuts="2">Île-de-France</region><settlement type="city">Paris</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Progress in Oceanography</title><title level="j" type="abbrev">PROOCE</title><idno type="ISSN">0079-6611</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2000">2000</date><biblScope unit="volume">47</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="1">1</biblScope><biblScope unit="page" to="68">68</biblScope></imprint><idno type="ISSN">0079-6611</idno></series><idno type="istex">A9293E5E4FEE41BD7D736335ABA0E6A117D3149D</idno><idno type="DOI">10.1016/S0079-6611(00)00031-8</idno><idno type="PII">S0079-6611(00)00031-8</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0079-6611</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">TOPEX/POSEÏDON and ERS1 sea level anomalies, expendable bathythermograph temperature profiles, sea surface salinities and satellite sea surface temperatures have been assimilated from November 1992 to October 1994 into a non-linear primitive equation model of the tropical Atlantic Ocean using a 4D-variational method. The model is forced monthly by ship winds and climatologies of heat and fresh water fluxes. The comparison between the model run both with and without assimilation is first analyzed in terms of empirical orthogonal functions, and along particular sections in the basin. The results are then compared with independent hydrological measurements obtained during the World Ocean Circulation Experiment cruise CITHER 1, in the tropical Atlantic Ocean in early 1993. The comparison is improved globally with assimilation. The largest impact of the assimilation appears in the North Equatorial Counter Current and the North Equatorial Current (5°N–15°N). Sub-surface thermocline motions were not reproduced by the model alone, but, are clearly depicted in the assimilation results along 7°30′N and are in good agreement with the CITHER 1 data. Considerations about the assimilation technique, the model and the forcing data sets are also discussed via this independent validation.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li><li>Île-de-France</li></region><settlement><li>Paris</li><li>Toulouse</li></settlement></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Greiner, Eric" sort="Greiner, Eric" uniqKey="Greiner E" first="Eric" last="Greiner">Eric Greiner</name></region><name sortKey="Arnault, Sabine" sort="Arnault, Sabine" uniqKey="Arnault S" first="Sabine" last="Arnault">Sabine Arnault</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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