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Can the ocean’s heat engine control horizontal circulation? Insights from the Caspian Sea.

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Title: Can the ocean’s heat engine control horizontal circulation? Insights from the Caspian Sea.
Authors: Bruneau, N
Zika, J
Toumi, R
Item Type: Journal Article
Abstract: We investigate the role of the ocean's heat engine in setting horizontal circulation using a numerical model of the Caspian Sea. The Caspian Sea can be seen as a virtual laboratory - a compromise between realistic global models which are hampered by long equilibration times and idealized basin geometry models which are not constrained by observations. We find that increases in vertical mixing drive stronger thermally direct overturning and consequent conversion of available potential to kinetic energy. Numerical solutions with water mass structures closest to observations overturn 0.02 − 0.04 x 106m3/s(Sv) representing the first estimate of Caspian Sea overturning. Our results also suggest that the overturning is thermally-forced increasing in intensity with increasing vertical diffusivity. Finally, stronger thermally direct overturning is associated with a stronger horizontal circulation in the Caspian Sea. This suggests the ocean's heat engine can strongly impact broader horizontal circulations in the ocean.
Issue Date: 21-Sep-2017
Date of Acceptance: 15-Sep-2017
URI: http://hdl.handle.net/10044/1/51030
DOI: https://dx.doi.org/10.1002/2017GL075182
ISSN: 0094-8276
Publisher: American Geophysical Union
Start Page: 9893
End Page: 9900
Journal / Book Title: Geophysical Research Letters
Volume: 44
Issue: 19
Copyright Statement: ©2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
SOUTHERN-OCEAN
THERMOHALINE STRUCTURE
SEASONAL VARIABILITY
GENERAL-CIRCULATION
MODEL
CLIMATE
FLUXES
WATER
TRANSPORT
CLOSURE
MD Multidisciplinary
Meteorology & Atmospheric Sciences
Publication Status: Published online
Appears in Collections:Space and Atmospheric Physics
Physics
Faculty of Natural Sciences



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