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Improving Oceanic Overflow Representation in Climate Models: The Gravity Current Entrainment Climate Process Team

Sonya Legg
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Bruce Briegleb
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Yeon Chang
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Eric P. Chassignet
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Gokhan Danabasoglu
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Tal Ezer
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Arnold L. Gordon
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Stephen Griffies
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Robert Hallberg
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Laura Jackson
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William Large
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Tamay M. Özgökmen
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Hartmut Peters
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Jim Price
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Ulrike Riemenschneider
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Wanli Wu
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Xiaobiao Xu
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Jiayan Yang
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Oceanic overflows are bottom-trapped density currents originating in semienclosed basins, such as the Nordic seas, or on continental shelves, such as the Antarctic shelf. Overflows are the source of most of the abyssal waters, and therefore play an important role in the large-scale ocean circulation, forming a component of the sinking branch of the thermohaline circulation. As they descend the continental slope, overflows mix vigorously with the surrounding oceanic waters, changing their density and transport significantly. These mixing processes occur on spatial scales well below the resolution of ocean climate models, with the result that deep waters and deep western boundary currents are simulated poorly. The Gravity Current Entrainment Climate Process Team was established by the U.S. Climate Variability and Prediction (CLIVAR) Program to accelerate the development and implementation of improved representations of overflows within large-scale climate models, bringing together climate model developers with those conducting observational, numerical, and laboratory process studies of overflows. Here, the organization of the Climate Process Team is described, and a few of the successes and lessons learned during this collaboration are highlighted, with some emphasis on the well-observed Mediterranean overflow. The Climate Process Team has developed several different overflow parameterizations, which are examined in a hierarchy of ocean models, from comparatively well-resolved regional models to the largest-scale global climate models.

Princeton University, Princeton, New Jersey

National Center for Atmospheric Research, Boulder, Colorado

University of Miami, Miami, Florida

The Florida State University, Tallahassee Florida

Lamont-Doherty Earth Observatory, Columbia University, New York, New York

NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey

Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

*ADDITIONAL AFFILIATION: Old Dominion University, Norfolk, Virginia

CORRESPONDING AUTHOR: Sonya Legg, NOAA/GFDL, Princeton University Forrestal Campus, 201 Forrestal Drive, Princeton, NJ 08540, E-mail: sonya.legg@noaa.gov

Oceanic overflows are bottom-trapped density currents originating in semienclosed basins, such as the Nordic seas, or on continental shelves, such as the Antarctic shelf. Overflows are the source of most of the abyssal waters, and therefore play an important role in the large-scale ocean circulation, forming a component of the sinking branch of the thermohaline circulation. As they descend the continental slope, overflows mix vigorously with the surrounding oceanic waters, changing their density and transport significantly. These mixing processes occur on spatial scales well below the resolution of ocean climate models, with the result that deep waters and deep western boundary currents are simulated poorly. The Gravity Current Entrainment Climate Process Team was established by the U.S. Climate Variability and Prediction (CLIVAR) Program to accelerate the development and implementation of improved representations of overflows within large-scale climate models, bringing together climate model developers with those conducting observational, numerical, and laboratory process studies of overflows. Here, the organization of the Climate Process Team is described, and a few of the successes and lessons learned during this collaboration are highlighted, with some emphasis on the well-observed Mediterranean overflow. The Climate Process Team has developed several different overflow parameterizations, which are examined in a hierarchy of ocean models, from comparatively well-resolved regional models to the largest-scale global climate models.

Princeton University, Princeton, New Jersey

National Center for Atmospheric Research, Boulder, Colorado

University of Miami, Miami, Florida

The Florida State University, Tallahassee Florida

Lamont-Doherty Earth Observatory, Columbia University, New York, New York

NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, New Jersey

Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

*ADDITIONAL AFFILIATION: Old Dominion University, Norfolk, Virginia

CORRESPONDING AUTHOR: Sonya Legg, NOAA/GFDL, Princeton University Forrestal Campus, 201 Forrestal Drive, Princeton, NJ 08540, E-mail: sonya.legg@noaa.gov
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