Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction
Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(3), (2020): 679-694, doi:10.1175/JPO-D-19-0218.1...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/25681 2023-05-15T13:48:31+02:00 Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction Han, Lei Huang, Rui Xin 2020-03-02 https://hdl.handle.net/1912/25681 unknown American Meteorological Society https://doi.org/10.1175/JPO-D-19-0218.1 Han, L., & Huang, R. X. (2020). Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction. Journal of Physical Oceanography, 50(3), 679-694. https://hdl.handle.net/1912/25681 doi:10.1175/JPO-D-19-0218.1 Han, L., & Huang, R. X. (2020). Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction. Journal of Physical Oceanography, 50(3), 679-694. doi:10.1175/JPO-D-19-0218.1 Meridional overturning circulation Ocean circulation Streamfunction Article 2020 ftwhoas https://doi.org/10.1175/JPO-D-19-0218.1 2022-05-28T23:03:39Z Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(3), (2020): 679-694, doi:10.1175/JPO-D-19-0218.1. The zonally integrated flow in a basin can be separated into the divergent/nondivergent parts, and a uniquely defined meridional overturning circulation (MOC) can be calculated. For a basin with significant volume exchange at zonal open boundaries, this method is competent in removing the components associated with the nonzero source terms due to zonal transports at open boundaries. This method was applied to the zonally integrated flow in the Indian Ocean basin extended all the way to the Antarctic by virtue of the ECCO dataset. The contributions due to two major zonal flow systems at open boundaries, the Indonesian Throughflow (ITF) and the Antarctic Circumpolar Current (ACC), were well separated from the rotational flow component, and a nondivergent overturning circulation pattern was identified. Comparisons with previous studies on the MOC of the Indian Ocean in different seasons showed overall consistency but with refinements in details to the south of the entry of the ITF, reflecting the influence of ITF on the MOC pattern in the domain. Other options of decomposition are also examined. LH was supported by the National Basic Research Program of China through Grant 2019YFA0606703 and “The Fundamental Research Funds of Shandong University” (2019GN051). The authors thank the anonymous reviewers and the editor for their constructive comments. Code availability: The Matlab code that performs the decomposition and produces some figures in this paper is available at https://github.com/lei-han-SDU/IMOC/. 2020-09-02 Article in Journal/Newspaper Antarc* Antarctic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Antarctic Indian The Antarctic Journal of Physical Oceanography 50 3 679 694 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Meridional overturning circulation Ocean circulation Streamfunction |
spellingShingle |
Meridional overturning circulation Ocean circulation Streamfunction Han, Lei Huang, Rui Xin Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction |
topic_facet |
Meridional overturning circulation Ocean circulation Streamfunction |
description |
Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(3), (2020): 679-694, doi:10.1175/JPO-D-19-0218.1. The zonally integrated flow in a basin can be separated into the divergent/nondivergent parts, and a uniquely defined meridional overturning circulation (MOC) can be calculated. For a basin with significant volume exchange at zonal open boundaries, this method is competent in removing the components associated with the nonzero source terms due to zonal transports at open boundaries. This method was applied to the zonally integrated flow in the Indian Ocean basin extended all the way to the Antarctic by virtue of the ECCO dataset. The contributions due to two major zonal flow systems at open boundaries, the Indonesian Throughflow (ITF) and the Antarctic Circumpolar Current (ACC), were well separated from the rotational flow component, and a nondivergent overturning circulation pattern was identified. Comparisons with previous studies on the MOC of the Indian Ocean in different seasons showed overall consistency but with refinements in details to the south of the entry of the ITF, reflecting the influence of ITF on the MOC pattern in the domain. Other options of decomposition are also examined. LH was supported by the National Basic Research Program of China through Grant 2019YFA0606703 and “The Fundamental Research Funds of Shandong University” (2019GN051). The authors thank the anonymous reviewers and the editor for their constructive comments. Code availability: The Matlab code that performs the decomposition and produces some figures in this paper is available at https://github.com/lei-han-SDU/IMOC/. 2020-09-02 |
format |
Article in Journal/Newspaper |
author |
Han, Lei Huang, Rui Xin |
author_facet |
Han, Lei Huang, Rui Xin |
author_sort |
Han, Lei |
title |
Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction |
title_short |
Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction |
title_full |
Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction |
title_fullStr |
Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction |
title_full_unstemmed |
Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction |
title_sort |
using the helmholtz decomposition to define the indian ocean meridional overturning streamfunction |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://hdl.handle.net/1912/25681 |
geographic |
Antarctic Indian The Antarctic |
geographic_facet |
Antarctic Indian The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Han, L., & Huang, R. X. (2020). Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction. Journal of Physical Oceanography, 50(3), 679-694. doi:10.1175/JPO-D-19-0218.1 |
op_relation |
https://doi.org/10.1175/JPO-D-19-0218.1 Han, L., & Huang, R. X. (2020). Using the Helmholtz decomposition to define the Indian Ocean meridional overturning streamfunction. Journal of Physical Oceanography, 50(3), 679-694. https://hdl.handle.net/1912/25681 doi:10.1175/JPO-D-19-0218.1 |
op_doi |
https://doi.org/10.1175/JPO-D-19-0218.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
50 |
container_issue |
3 |
container_start_page |
679 |
op_container_end_page |
694 |
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1766249367291822080 |