Formulation of a new ocean salinity boundary condition and impact on the simulated climate of an oceanic general circulation model

The salinity boundary condition at the ocean surface plays an important role in the stability of long-term integrations of an oceanic general circulation model （OGCM） and in determining its equilibrium solutions. This study presents a new formulation of the salt flux calculation at the ocean surface...

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Bibliographic Details
Published inScience China. Earth sciences Vol. 60; no. 3; pp. 491 - 500
Main Authors Jin, JiangBo, Zeng, QingCun, Wu, Lin, Liu, HaiLong, Zhang, MingHua
Format Journal Article
LanguageEnglish
Published Beijing Science China Press 01.03.2017
Springer Nature B.V
Subjects
Atmospheric physics
Atmospheric sciences
Boundary conditions
Earth and Environmental Science
Earth Sciences
Fluctuations
Fluid dynamics
Heat transport
Hydrodynamics
Marine
Ocean circulation
Oceans
Research Paper
Salinity
Salts
Surface water
A, Atlantic
Surface salinity boundary condition
Virtual salinity flux
OGCM
Upward salt flux from oceanic surface
AMOC
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Summary:The salinity boundary condition at the ocean surface plays an important role in the stability of long-term integrations of an oceanic general circulation model （OGCM） and in determining its equilibrium solutions. This study presents a new formulation of the salt flux calculation at the ocean surface based on physical processes of salt exchange at the air-sea interface. The formulation improves the commonly used virtual salt flux with constant reference salinity by allowing for spatial correlations between surface freshwater flux and sea-surface salinity while preserving the conservation of global salinity. The new boundary condition is implemented in the latest version of the National Key Laboratory of NumericaI Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics/Institute of Atmospheric Physics Climate Ocean Model version 2 （LICOM2.0）. The impact of the new boundary condition on the equilibrium simulations of the model is presented. It is shown that the new formulation leads to a stronger Atlantic meridional overturning circulation （AMOC） that is closer to observational estimates. It also slightly improves poleward heat transport by the oceans in both the Atlantic and the global oceans.
Bibliography:The salinity boundary condition at the ocean surface plays an important role in the stability of long-term integrations of an oceanic general circulation model （OGCM） and in determining its equilibrium solutions. This study presents a new formulation of the salt flux calculation at the ocean surface based on physical processes of salt exchange at the air-sea interface. The formulation improves the commonly used virtual salt flux with constant reference salinity by allowing for spatial correlations between surface freshwater flux and sea-surface salinity while preserving the conservation of global salinity. The new boundary condition is implemented in the latest version of the National Key Laboratory of NumericaI Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics/Institute of Atmospheric Physics Climate Ocean Model version 2 （LICOM2.0）. The impact of the new boundary condition on the equilibrium simulations of the model is presented. It is shown that the new formulation leads to a stronger Atlantic meridional overturning circulation （AMOC） that is closer to observational estimates. It also slightly improves poleward heat transport by the oceans in both the Atlantic and the global oceans.
11-5843/P
OGCM, Surface salinity boundary condition, Virtual salinity flux, Upward salt flux from oceanic surface, AMOC
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-016-9004-4