Horizontal residual mean: Addressing the limited spatial resolution of ocean models
Horizontal fluxes of heat and other scalar quantities in the ocean are due to correlations between the horizontal velocity and tracer fields. However, the limited spatial resolution of ocean models means that these correlations are not fully resolved using the velocity and temperature evaluated on t...
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American Meteorological Society
2019
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Online Access: | http://hdl.handle.net/1959.4/unsworks_74892 https://unsworks.unsw.edu.au/bitstreams/2e1e3277-fca2-4769-9a15-011937c0dd7c/download https://doi.org/10.1175/jpo-d-19-0092.1 |
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_74892 2024-05-19T07:48:58+00:00 Horizontal residual mean: Addressing the limited spatial resolution of ocean models Li, Y McDougall, T Keating, S DE LAVERGNE, C Madec, G 2019-01-01 application/pdf http://hdl.handle.net/1959.4/unsworks_74892 https://unsworks.unsw.edu.au/bitstreams/2e1e3277-fca2-4769-9a15-011937c0dd7c/download https://doi.org/10.1175/jpo-d-19-0092.1 unknown American Meteorological Society http://hdl.handle.net/1959.4/unsworks_74892 https://unsworks.unsw.edu.au/bitstreams/2e1e3277-fca2-4769-9a15-011937c0dd7c/download https://doi.org/10.1175/jpo-d-19-0092.1 open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read urn:ISSN:0022-3670 urn:ISSN:1520-0485 Journal of Physical Oceanography, 49, 11, 2741-2759 14 Life Below Water anzsrc-for: 0405 Oceanography anzsrc-for: 0911 Maritime Engineering journal article http://purl.org/coar/resource_type/c_6501 2019 ftunswworks https://doi.org/10.1175/jpo-d-19-0092.1 2024-04-24T01:01:27Z Horizontal fluxes of heat and other scalar quantities in the ocean are due to correlations between the horizontal velocity and tracer fields. However, the limited spatial resolution of ocean models means that these correlations are not fully resolved using the velocity and temperature evaluated on the model grid, due to the limited spatial resolution and the boxcar-averaged nature of the velocity and the scalar field. In this article, a method of estimating the horizontal flux due to unresolved spatial correlations is proposed, based on the depth-integrated horizontal transport from the seafloor to the density surface whose spatially averaged height is the height of the calculation. This depth-integrated horizontal transport takes into account the subgrid velocity and density variations to compensate the standard estimate of horizontal transport based on staircase-like velocity and density. It is not a parameterization of unresolved eddies, since it utilizes data available in ocean models without relying on any presumed parameter such as diffusivity. The method is termed the horizontal residual mean (HRM). The method is capable of estimating the spatial-correlation-induced water transport in a 1/48 global ocean model, using model data smoothed to 3/48. The HRM extra overturning has a peak in the Southern Ocean of about 1.5 Sv (1 Sv = 106 m3 s-1 ). This indicates an extra heat transport of 0.015 PW on average in the same area. It is expected that implementing the scheme in a coarse-resolution ocean model will improve its representation of lateral heat fluxes. Article in Journal/Newspaper Southern Ocean UNSW Sydney (The University of New South Wales): UNSWorks Journal of Physical Oceanography 49 11 2741 2759 |
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UNSW Sydney (The University of New South Wales): UNSWorks |
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unknown |
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14 Life Below Water anzsrc-for: 0405 Oceanography anzsrc-for: 0911 Maritime Engineering |
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14 Life Below Water anzsrc-for: 0405 Oceanography anzsrc-for: 0911 Maritime Engineering Li, Y McDougall, T Keating, S DE LAVERGNE, C Madec, G Horizontal residual mean: Addressing the limited spatial resolution of ocean models |
topic_facet |
14 Life Below Water anzsrc-for: 0405 Oceanography anzsrc-for: 0911 Maritime Engineering |
description |
Horizontal fluxes of heat and other scalar quantities in the ocean are due to correlations between the horizontal velocity and tracer fields. However, the limited spatial resolution of ocean models means that these correlations are not fully resolved using the velocity and temperature evaluated on the model grid, due to the limited spatial resolution and the boxcar-averaged nature of the velocity and the scalar field. In this article, a method of estimating the horizontal flux due to unresolved spatial correlations is proposed, based on the depth-integrated horizontal transport from the seafloor to the density surface whose spatially averaged height is the height of the calculation. This depth-integrated horizontal transport takes into account the subgrid velocity and density variations to compensate the standard estimate of horizontal transport based on staircase-like velocity and density. It is not a parameterization of unresolved eddies, since it utilizes data available in ocean models without relying on any presumed parameter such as diffusivity. The method is termed the horizontal residual mean (HRM). The method is capable of estimating the spatial-correlation-induced water transport in a 1/48 global ocean model, using model data smoothed to 3/48. The HRM extra overturning has a peak in the Southern Ocean of about 1.5 Sv (1 Sv = 106 m3 s-1 ). This indicates an extra heat transport of 0.015 PW on average in the same area. It is expected that implementing the scheme in a coarse-resolution ocean model will improve its representation of lateral heat fluxes. |
format |
Article in Journal/Newspaper |
author |
Li, Y McDougall, T Keating, S DE LAVERGNE, C Madec, G |
author_facet |
Li, Y McDougall, T Keating, S DE LAVERGNE, C Madec, G |
author_sort |
Li, Y |
title |
Horizontal residual mean: Addressing the limited spatial resolution of ocean models |
title_short |
Horizontal residual mean: Addressing the limited spatial resolution of ocean models |
title_full |
Horizontal residual mean: Addressing the limited spatial resolution of ocean models |
title_fullStr |
Horizontal residual mean: Addressing the limited spatial resolution of ocean models |
title_full_unstemmed |
Horizontal residual mean: Addressing the limited spatial resolution of ocean models |
title_sort |
horizontal residual mean: addressing the limited spatial resolution of ocean models |
publisher |
American Meteorological Society |
publishDate |
2019 |
url |
http://hdl.handle.net/1959.4/unsworks_74892 https://unsworks.unsw.edu.au/bitstreams/2e1e3277-fca2-4769-9a15-011937c0dd7c/download https://doi.org/10.1175/jpo-d-19-0092.1 |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
urn:ISSN:0022-3670 urn:ISSN:1520-0485 Journal of Physical Oceanography, 49, 11, 2741-2759 |
op_relation |
http://hdl.handle.net/1959.4/unsworks_74892 https://unsworks.unsw.edu.au/bitstreams/2e1e3277-fca2-4769-9a15-011937c0dd7c/download https://doi.org/10.1175/jpo-d-19-0092.1 |
op_rights |
open access https://purl.org/coar/access_right/c_abf2 CC-BY-NC-ND https://creativecommons.org/licenses/by-nc-nd/4.0/ free_to_read |
op_doi |
https://doi.org/10.1175/jpo-d-19-0092.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
49 |
container_issue |
11 |
container_start_page |
2741 |
op_container_end_page |
2759 |
_version_ |
1799467373442367488 |