Parameterization of vertical mixing in the Weddell Sea
A series of vertical mixing schemes implemented in a circumpolar coupled ice-ocean model of the BRIOS family is validated against observations of hydrography and sea ice coverage in the Weddell Sea.Assessed parameterizations include the Richardson number-dependent Pacanowski-Philander scheme, the Me...
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ftawi:oai:epic.awi.de:5526 2023-09-05T13:23:05+02:00 Parameterization of vertical mixing in the Weddell Sea Timmermann, Ralph Beckmann, A. 2004 application/pdf https://epic.awi.de/id/eprint/5526/ https://epic.awi.de/id/eprint/5526/1/Tim2002a.pdf https://doi.org/10.1016/S1463-5003(02)0061-6 https://hdl.handle.net/10013/epic.16093 https://hdl.handle.net/10013/epic.16093.d001 unknown https://epic.awi.de/id/eprint/5526/1/Tim2002a.pdf https://hdl.handle.net/10013/epic.16093.d001 Timmermann, R. and Beckmann, A. (2004) Parameterization of vertical mixing in the Weddell Sea , Ocean modelling, 6 (1), pp. 83-100 . doi:10.1016/S1463-5003(02)0061-6 <https://doi.org/10.1016/S1463-5003%2802%290061-6> , hdl:10013/epic.16093 EPIC3Ocean modelling, 6(1), pp. 83-100, ISSN: 1463-5003 Article isiRev 2004 ftawi https://doi.org/10.1016/S1463-5003(02)0061-6 2023-08-22T19:45:30Z A series of vertical mixing schemes implemented in a circumpolar coupled ice-ocean model of the BRIOS family is validated against observations of hydrography and sea ice coverage in the Weddell Sea.Assessed parameterizations include the Richardson number-dependent Pacanowski-Philander scheme, the Mellor-Yamada turbulent closure scheme, the K-Profile Parameterization, a bulk mixed layer model and the Ocean Penetrative Plume Scheme.Combinations of the Pacanowski-Philander parameterization or the Ocean Penetrative Plume Scheme with a simple diagnostic model depending on the Monin-Obukhov length yield particularly good results.In contrast, experiments using a constant diffusivity and the traditional {\it convective adjustment} cannot reproduce the observations.An underestimation of wind-driven mixing in summer leads to an accumulation of salt in the winter water layer, inducing deep convection in the central Weddell Sea and a homogenization of the water column.Large upward heat fluxes in these simulations lead to the formation of unrealistic, large polynyas in the central Weddell Sea after only a few years of integration.We conclude that an adequate parameterization of both wind-induced mixing and bouyancy-driven convection is crucial for realistic simulations of processes in seasonally ice-covered seas. Article in Journal/Newspaper Sea ice Weddell Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Weddell Sea Weddell Mellor ENVELOPE(-114.944,-114.944,60.714,60.714) |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A series of vertical mixing schemes implemented in a circumpolar coupled ice-ocean model of the BRIOS family is validated against observations of hydrography and sea ice coverage in the Weddell Sea.Assessed parameterizations include the Richardson number-dependent Pacanowski-Philander scheme, the Mellor-Yamada turbulent closure scheme, the K-Profile Parameterization, a bulk mixed layer model and the Ocean Penetrative Plume Scheme.Combinations of the Pacanowski-Philander parameterization or the Ocean Penetrative Plume Scheme with a simple diagnostic model depending on the Monin-Obukhov length yield particularly good results.In contrast, experiments using a constant diffusivity and the traditional {\it convective adjustment} cannot reproduce the observations.An underestimation of wind-driven mixing in summer leads to an accumulation of salt in the winter water layer, inducing deep convection in the central Weddell Sea and a homogenization of the water column.Large upward heat fluxes in these simulations lead to the formation of unrealistic, large polynyas in the central Weddell Sea after only a few years of integration.We conclude that an adequate parameterization of both wind-induced mixing and bouyancy-driven convection is crucial for realistic simulations of processes in seasonally ice-covered seas. |
format |
Article in Journal/Newspaper |
author |
Timmermann, Ralph Beckmann, A. |
spellingShingle |
Timmermann, Ralph Beckmann, A. Parameterization of vertical mixing in the Weddell Sea |
author_facet |
Timmermann, Ralph Beckmann, A. |
author_sort |
Timmermann, Ralph |
title |
Parameterization of vertical mixing in the Weddell Sea |
title_short |
Parameterization of vertical mixing in the Weddell Sea |
title_full |
Parameterization of vertical mixing in the Weddell Sea |
title_fullStr |
Parameterization of vertical mixing in the Weddell Sea |
title_full_unstemmed |
Parameterization of vertical mixing in the Weddell Sea |
title_sort |
parameterization of vertical mixing in the weddell sea |
publishDate |
2004 |
url |
https://epic.awi.de/id/eprint/5526/ https://epic.awi.de/id/eprint/5526/1/Tim2002a.pdf https://doi.org/10.1016/S1463-5003(02)0061-6 https://hdl.handle.net/10013/epic.16093 https://hdl.handle.net/10013/epic.16093.d001 |
long_lat |
ENVELOPE(-114.944,-114.944,60.714,60.714) |
geographic |
Weddell Sea Weddell Mellor |
geographic_facet |
Weddell Sea Weddell Mellor |
genre |
Sea ice Weddell Sea |
genre_facet |
Sea ice Weddell Sea |
op_source |
EPIC3Ocean modelling, 6(1), pp. 83-100, ISSN: 1463-5003 |
op_relation |
https://epic.awi.de/id/eprint/5526/1/Tim2002a.pdf https://hdl.handle.net/10013/epic.16093.d001 Timmermann, R. and Beckmann, A. (2004) Parameterization of vertical mixing in the Weddell Sea , Ocean modelling, 6 (1), pp. 83-100 . doi:10.1016/S1463-5003(02)0061-6 <https://doi.org/10.1016/S1463-5003%2802%290061-6> , hdl:10013/epic.16093 |
op_doi |
https://doi.org/10.1016/S1463-5003(02)0061-6 |
_version_ |
1776203658572070912 |