Climate impacts of parameterized Nordic Sea overflows
A new overflow parameterization (OFP) of density-driven flows through ocean ridges via narrow, unresolved channels has been developed and implemented in the ocean component of the Community Climate System Model version 4. It represents exchanges from the Nordic Seas and the Antarctic shelves, associ...
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American Geophysical Union
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ftncar:oai:drupal-site.org:articles_10886 2023-09-05T13:14:59+02:00 Climate impacts of parameterized Nordic Sea overflows Danabasoglu, Gokhan (author) Large, William (author) Briegleb, Bruce (author) 2010-11-06 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-714 https://doi.org/10.1029/2010JC006243 en eng American Geophysical Union Journal of Geophysical Research-Oceans http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-714 doi:10.1029/2010JC006243 wos: 000283947400002 ark:/85065/d78k79pt Copyright 2010 American Geophysical Union. Text article 2010 ftncar https://doi.org/10.1029/2010JC006243 2023-08-14T18:38:06Z A new overflow parameterization (OFP) of density-driven flows through ocean ridges via narrow, unresolved channels has been developed and implemented in the ocean component of the Community Climate System Model version 4. It represents exchanges from the Nordic Seas and the Antarctic shelves, associated entrainment, and subsequent injection of overflow product waters into the abyssal basins. We investigate the effects of the parameterized Denmark Strait (DS) and Faroe Bank Channel (FBC) overflows on the ocean circulation, showing their impacts on the Atlantic Meridional Overturning Circulation and the North Atlantic climate. The OFP is based on the Marginal Sea Boundary Condition scheme of Price and Yang (1998), but there are significant differences that are described in detail. Two uncoupled (ocean-only) and two fully coupled simulations are analyzed. Each pair consists of one case with the OFP and a control case without this parameterization. In both uncoupled and coupled experiments, the parameterized DS and FBC source volume transports are within the range of observed estimates. The entrainment volume transports remain lower than observational estimates, leading to lower than observed product volume transports. Due to low entrainment, the product and source water properties are too similar. The DS and FBC overflow temperature and salinity properties are in better agreement with observations in the uncoupled case than in the coupled simulation, likely reflecting surface flux differences. The most significant impact of the OFP is the improved North Atlantic Deep Water penetration depth, leading to a much better comparison with the observational data and significantly reducing the chronic, shallow penetration depth bias in level coordinate models. This improvement is due to the deeper penetration of the southward flowing Deep Western Boundary Current. In comparison with control experiments without the OFP, the abyssal ventilation rates increase in the North Atlantic. In the uncoupled simulation with the OFP, ... Article in Journal/Newspaper Antarc* Antarctic Denmark Strait Nordic Sea Nordic Seas North Atlantic Deep Water North Atlantic OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic Faroe Bank ENVELOPE(-8.667,-8.667,60.917,60.917) The Antarctic Journal of Geophysical Research 115 C11 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
A new overflow parameterization (OFP) of density-driven flows through ocean ridges via narrow, unresolved channels has been developed and implemented in the ocean component of the Community Climate System Model version 4. It represents exchanges from the Nordic Seas and the Antarctic shelves, associated entrainment, and subsequent injection of overflow product waters into the abyssal basins. We investigate the effects of the parameterized Denmark Strait (DS) and Faroe Bank Channel (FBC) overflows on the ocean circulation, showing their impacts on the Atlantic Meridional Overturning Circulation and the North Atlantic climate. The OFP is based on the Marginal Sea Boundary Condition scheme of Price and Yang (1998), but there are significant differences that are described in detail. Two uncoupled (ocean-only) and two fully coupled simulations are analyzed. Each pair consists of one case with the OFP and a control case without this parameterization. In both uncoupled and coupled experiments, the parameterized DS and FBC source volume transports are within the range of observed estimates. The entrainment volume transports remain lower than observational estimates, leading to lower than observed product volume transports. Due to low entrainment, the product and source water properties are too similar. The DS and FBC overflow temperature and salinity properties are in better agreement with observations in the uncoupled case than in the coupled simulation, likely reflecting surface flux differences. The most significant impact of the OFP is the improved North Atlantic Deep Water penetration depth, leading to a much better comparison with the observational data and significantly reducing the chronic, shallow penetration depth bias in level coordinate models. This improvement is due to the deeper penetration of the southward flowing Deep Western Boundary Current. In comparison with control experiments without the OFP, the abyssal ventilation rates increase in the North Atlantic. In the uncoupled simulation with the OFP, ... |
author2 |
Danabasoglu, Gokhan (author) Large, William (author) Briegleb, Bruce (author) |
format |
Article in Journal/Newspaper |
title |
Climate impacts of parameterized Nordic Sea overflows |
spellingShingle |
Climate impacts of parameterized Nordic Sea overflows |
title_short |
Climate impacts of parameterized Nordic Sea overflows |
title_full |
Climate impacts of parameterized Nordic Sea overflows |
title_fullStr |
Climate impacts of parameterized Nordic Sea overflows |
title_full_unstemmed |
Climate impacts of parameterized Nordic Sea overflows |
title_sort |
climate impacts of parameterized nordic sea overflows |
publisher |
American Geophysical Union |
publishDate |
2010 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-714 https://doi.org/10.1029/2010JC006243 |
long_lat |
ENVELOPE(-8.667,-8.667,60.917,60.917) |
geographic |
Antarctic Faroe Bank The Antarctic |
geographic_facet |
Antarctic Faroe Bank The Antarctic |
genre |
Antarc* Antarctic Denmark Strait Nordic Sea Nordic Seas North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic Denmark Strait Nordic Sea Nordic Seas North Atlantic Deep Water North Atlantic |
op_relation |
Journal of Geophysical Research-Oceans http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-003-714 doi:10.1029/2010JC006243 wos: 000283947400002 ark:/85065/d78k79pt |
op_rights |
Copyright 2010 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2010JC006243 |
container_title |
Journal of Geophysical Research |
container_volume |
115 |
container_issue |
C11 |
_version_ |
1776196845694877696 |