Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen
Thesis (Sc. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), February 2000. Includes bibliographical references (p. 250-266). A new, global inversion is used to esti...
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ftmit:oai:dspace.mit.edu:1721.1/58541 2023-06-11T04:17:04+02:00 Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen Ganachaud, Alexandre Similien, 1970- Carl Wunsch. Woods Hole Oceanographic Institution. Joint Program in Physical Oceanography Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences 2000 266 p. application/pdf http://hdl.handle.net/1721.1/58541 eng eng Massachusetts Institute of Technology http://hdl.handle.net/1721.1/58541 45302218 M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Joint Program in Physical Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Thesis 2000 ftmit 2023-05-29T08:17:53Z Thesis (Sc. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), February 2000. Includes bibliographical references (p. 250-266). A new, global inversion is used to estimate the large scale oceanic circulation based on the World Ocean Circulation Experiment and Java Australia Dynamic Experiment hydrographic data. A linear inverse "box" model is used to combine consistently the transoceanic sections. The circulation is geostrophic with an Ekman layer at the surface and oceanic layers defined by neutral surfaces. Near-conservation of mass, salt and top-to-bottom silica is required and, in addition, heat and the phosphate-oxygen combination (170[PO 4]+[0 2]) are conserved in layers that are not in contact with the surface. A globally-consistent solution is obtained for a depth-independent adjustment to the thermal wind field, freshwater flux divergences, the Ekman transport, and the advective and diffusive dianeutral fluxes between layers. A detailed error budget permits calculation of statistical uncertainties, taking into account both the non-resolved part of the solution and the systematic errors due to the temporal oceanic variability. The estimated water mass transports during the WOCE period (1985-1996) are generally similar to previous published estimates. However, important differences are found. In particular, the inflow of bottom waters into the Pacific Ocean is smaller than in most previous estimates. Utilization of property anomaly conservation constraints allows the estimation of significant dianeutral diffusivities in deep layers, with a global average of 3 ± 1cm 2 s-1 north of 30'S. Dianeutral transfers indicate that about 20 Sv of bottom water is formed in the Southern Ocean. Significant oceanatmosphere heat fluxes are found, with a global heating of 2.3 ± 0.4 PW in the tropical band and a corresponding cooling at high latitudes. The signature of a large-scale ... Thesis Southern Ocean DSpace@MIT (Massachusetts Institute of Technology) Southern Ocean Pacific |
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Open Polar |
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DSpace@MIT (Massachusetts Institute of Technology) |
op_collection_id |
ftmit |
language |
English |
topic |
Joint Program in Physical Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution |
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Joint Program in Physical Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Ganachaud, Alexandre Similien, 1970- Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen |
topic_facet |
Joint Program in Physical Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution |
description |
Thesis (Sc. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), February 2000. Includes bibliographical references (p. 250-266). A new, global inversion is used to estimate the large scale oceanic circulation based on the World Ocean Circulation Experiment and Java Australia Dynamic Experiment hydrographic data. A linear inverse "box" model is used to combine consistently the transoceanic sections. The circulation is geostrophic with an Ekman layer at the surface and oceanic layers defined by neutral surfaces. Near-conservation of mass, salt and top-to-bottom silica is required and, in addition, heat and the phosphate-oxygen combination (170[PO 4]+[0 2]) are conserved in layers that are not in contact with the surface. A globally-consistent solution is obtained for a depth-independent adjustment to the thermal wind field, freshwater flux divergences, the Ekman transport, and the advective and diffusive dianeutral fluxes between layers. A detailed error budget permits calculation of statistical uncertainties, taking into account both the non-resolved part of the solution and the systematic errors due to the temporal oceanic variability. The estimated water mass transports during the WOCE period (1985-1996) are generally similar to previous published estimates. However, important differences are found. In particular, the inflow of bottom waters into the Pacific Ocean is smaller than in most previous estimates. Utilization of property anomaly conservation constraints allows the estimation of significant dianeutral diffusivities in deep layers, with a global average of 3 ± 1cm 2 s-1 north of 30'S. Dianeutral transfers indicate that about 20 Sv of bottom water is formed in the Southern Ocean. Significant oceanatmosphere heat fluxes are found, with a global heating of 2.3 ± 0.4 PW in the tropical band and a corresponding cooling at high latitudes. The signature of a large-scale ... |
author2 |
Carl Wunsch. Woods Hole Oceanographic Institution. Joint Program in Physical Oceanography Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
format |
Thesis |
author |
Ganachaud, Alexandre Similien, 1970- |
author_facet |
Ganachaud, Alexandre Similien, 1970- |
author_sort |
Ganachaud, Alexandre Similien, 1970- |
title |
Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen |
title_short |
Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen |
title_full |
Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen |
title_fullStr |
Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen |
title_full_unstemmed |
Large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen |
title_sort |
large scale oceanic circulation and fluxes of freshwater, heat, nutrients and oxygen |
publisher |
Massachusetts Institute of Technology |
publishDate |
2000 |
url |
http://hdl.handle.net/1721.1/58541 |
geographic |
Southern Ocean Pacific |
geographic_facet |
Southern Ocean Pacific |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
http://hdl.handle.net/1721.1/58541 45302218 |
op_rights |
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 |
_version_ |
1768375859914211328 |