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A note on the influence of spatially varying diffusivities on the evolution of buoyancy with a nonlinear equation of state
Stockholm University, Faculty of Science, Department of Meteorology .
2014 (English)In: Journal of Physical Oceanography, ISSN 0022-3670, E-ISSN 1520-0485, Vol. 44, no 12, 3255-3261 p.Article in journal (Refereed) Published
Abstract [en]

The oceanic buoyancy sinks from thermobaricity and cabbeling are quantified using hydrography and parameterized diffusive fluxes of heat and salt. A novelty in this study is that the effect of spatially varying diffusivities is considered and quantified. The spatial distribution as well as averages from different ocean basins of the cabbeling and thermobaricity sinks are shown and discussed. The contributions from isoneutral and dianeutral diffusion to the cabbeling and thermobaricity sinks are calculated separately, and their relative importance is seen to vary in the different ocean basins.

Place, publisher, year, edition, pages
2014. Vol. 44, no 12, 3255-3261 p.
National Category
Oceanography, Hydrology, Water Resources
Research subject
Atmospheric Sciences and Oceanography
Identifiers
URN: urn:nbn:se:su:diva-103216DOI: 10.1175/JPO-D-13-0262.1ISI: 000345812300017OAI: oai:DiVA.org:su-103216DiVA: diva2:716398
Available from: 2014-05-09 Created: 2014-05-09 Last updated: 2017-12-05Bibliographically approved
In thesis
1. An investigation into ocean thermodynamics and water-mass transformation
Open this publication in new window or tab >>An investigation into ocean thermodynamics and water-mass transformation
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents oceanic budgets of potential temperature, salinity and buoyancy as well as a novel way of diagnosing water-mass transformation in salinity-temperature space. The buoyancy of seawater is given by a nonlinear function of temperature, salinity and pressure and much of the work in this thesis revolves around how fluxes of heat and salinity influence the buoyancy of seawater through these nonlinearities.

Another large part of the material in this thesis is aimed at quantifying the relative importance of different processes for the vertical transport of heat and salinity in the ocean. Careful analysis of those fluxes in an ocean model reveal the different effects of e.g. advection, diffusion and penetrative shortwave radiation. An interesting finding is that the diffusive fluxes due to isoneutral diffusion (diffusion along density surfaces) and dianeutral diffusion (diffusion across density surfaces) have opposing effects on the oceanic heat and salinity budgets.

The final major topic of this thesis is water-mass transformation. A quantitative framework for the study of water-mass transformation in salinity-temperature space is introduced. A continuity equation is also derived for salinity-temperature space, which can be used to calculate the time rate of change of volume in a small salinity-temperature interval. The water-mass transformation framework is applied in an ocean general circulation model, and it is shown how the volume distribution in salinity-temperature space is affected by the different tracer fluxes in the model. It is also shown how the transformation framework is related to earlier work on thermohaline streamfunctions.

Place, publisher, year, edition, pages
Stockhom: Department of Meteorology, Stockholm University, 2014. 43 p.
Keyword
Ocean thermodynamics, water-mass transformation, buoyancy
National Category
Oceanography, Hydrology, Water Resources
Research subject
Atmospheric Sciences and Oceanography
Identifiers
urn:nbn:se:su:diva-103040 (URN)978-91-7447-919-5 (ISBN)
Public defence
2014-06-03, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2014-05-12 Created: 2014-04-29 Last updated: 2014-05-13Bibliographically approved

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