Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline
Lateral diffusivity is computed from a tracer release experiment in the northeastern tropical Atlantic thermocline. The uncertainties of the estimates are inferred from a synthetic particle release using a high-resolution ocean circulation model. The main method employed to compute zonal and meridio...
Published in: | Journal of Geophysical Research: Oceans |
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Language: | English |
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2013
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Online Access: | https://oceanrep.geomar.de/id/eprint/21365/ https://oceanrep.geomar.de/id/eprint/21365/1/jgrc20211.pdf https://doi.org/10.1002/jgrc.20211 |
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ftoceanrep:oai:oceanrep.geomar.de:21365 2023-05-15T17:33:57+02:00 Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline Banyte, Donata Visbeck, Martin Tanhua, Toste Fischer, Tim Krahmann, Gerd Karstensen, Johannes 2013-05-30 text https://oceanrep.geomar.de/id/eprint/21365/ https://oceanrep.geomar.de/id/eprint/21365/1/jgrc20211.pdf https://doi.org/10.1002/jgrc.20211 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/21365/1/jgrc20211.pdf Banyte, D., Visbeck, M. , Tanhua, T. , Fischer, T. , Krahmann, G. and Karstensen, J. (2013) Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline. Open Access Journal of Geophysical Research: Oceans, 118 (4). pp. 1-15. DOI 10.1002/jgrc.20211 <https://doi.org/10.1002/jgrc.20211>. doi:10.1002/jgrc.20211 info:eu-repo/semantics/openAccess Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1002/jgrc.20211 2023-04-07T15:09:25Z Lateral diffusivity is computed from a tracer release experiment in the northeastern tropical Atlantic thermocline. The uncertainties of the estimates are inferred from a synthetic particle release using a high-resolution ocean circulation model. The main method employed to compute zonal and meridional components of lateral diffusivity is the growth of the second moment of a cloud of tracer. The application of an areal comparison method for estimating tracer-based diffusivity in the field experiments is also discussed. The best estimate of meridional eddy diffusivity in the Guinea Upwelling region at about 300 m depth is estimated to be inline image m2 s−1. The zonal component of lateral diffusivity is estimated to be inline image m2 s−1, while areal comparison method yields areal equivalent zonal diffusivity component of inline image m2 s−1. In comparison to Ky, Kx is about twice larger, resulting from the tracer patch stretching by zonal jets. Employed conceptual jet model indicates that zonal jet velocities of about inline image m s−1 are required to explain the enhancement of the zonal eddy diffusivity component. Finally, different sampling strategies are tested on synthetic tracer release experiments. They indicate that the best sampling strategy is a sparse regular sampling grid covering most of the tracer patch. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Journal of Geophysical Research: Oceans 118 5 2719 2733 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Lateral diffusivity is computed from a tracer release experiment in the northeastern tropical Atlantic thermocline. The uncertainties of the estimates are inferred from a synthetic particle release using a high-resolution ocean circulation model. The main method employed to compute zonal and meridional components of lateral diffusivity is the growth of the second moment of a cloud of tracer. The application of an areal comparison method for estimating tracer-based diffusivity in the field experiments is also discussed. The best estimate of meridional eddy diffusivity in the Guinea Upwelling region at about 300 m depth is estimated to be inline image m2 s−1. The zonal component of lateral diffusivity is estimated to be inline image m2 s−1, while areal comparison method yields areal equivalent zonal diffusivity component of inline image m2 s−1. In comparison to Ky, Kx is about twice larger, resulting from the tracer patch stretching by zonal jets. Employed conceptual jet model indicates that zonal jet velocities of about inline image m s−1 are required to explain the enhancement of the zonal eddy diffusivity component. Finally, different sampling strategies are tested on synthetic tracer release experiments. They indicate that the best sampling strategy is a sparse regular sampling grid covering most of the tracer patch. |
format |
Article in Journal/Newspaper |
author |
Banyte, Donata Visbeck, Martin Tanhua, Toste Fischer, Tim Krahmann, Gerd Karstensen, Johannes |
spellingShingle |
Banyte, Donata Visbeck, Martin Tanhua, Toste Fischer, Tim Krahmann, Gerd Karstensen, Johannes Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline |
author_facet |
Banyte, Donata Visbeck, Martin Tanhua, Toste Fischer, Tim Krahmann, Gerd Karstensen, Johannes |
author_sort |
Banyte, Donata |
title |
Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline |
title_short |
Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline |
title_full |
Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline |
title_fullStr |
Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline |
title_full_unstemmed |
Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline |
title_sort |
lateral diffusivity from tracer release experiments in the tropical north atlantic thermocline |
publisher |
AGU (American Geophysical Union) |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/21365/ https://oceanrep.geomar.de/id/eprint/21365/1/jgrc20211.pdf https://doi.org/10.1002/jgrc.20211 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/21365/1/jgrc20211.pdf Banyte, D., Visbeck, M. , Tanhua, T. , Fischer, T. , Krahmann, G. and Karstensen, J. (2013) Lateral diffusivity from tracer release experiments in the tropical North Atlantic thermocline. Open Access Journal of Geophysical Research: Oceans, 118 (4). pp. 1-15. DOI 10.1002/jgrc.20211 <https://doi.org/10.1002/jgrc.20211>. doi:10.1002/jgrc.20211 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/jgrc.20211 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
5 |
container_start_page |
2719 |
op_container_end_page |
2733 |
_version_ |
1766132618650189824 |