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Direct estimate of water, heat, and salt transport through the Strait of Otranto

Direct estimate of water, heat, and salt transport through the Strait of Otranto
Direct estimate of water, heat, and salt transport through the Strait of Otranto
The transport of water volume, salt and heat was calculated using continuous measurements of currents in the Otranto Strait for a one-year period in 1994–95. Temperature and salinity data sets, available from five hydrographic surveys, were used to obtain the seasonal temperature and salinity distributions at the Otranto transect. The Variational Inverse Method (VIM) was applied to reconstruct spatial distributions of the de-tided low-pass inflowing current component, salinity and temperature. Errors associated with estimates of transports are influenced by the data coverage: the higher the spatial resolution, the smaller the error and vice versa. Volume transport reaches a maximum in winter and spring and attains its minimum in summer. The obtained volume transport [?1 Sv (106 m3s?1)] should be considered a lower limit value since in that period the Adriatic was producing relatively small quantities of deep water due to the inflow of low-salinity (high buoyancy) waters and relatively mild winters. Comparing the mean advective heat input and the air-sea heat loss, the same order of magnitude between the two has been obtained which is satisfactory considering the possible errors of the two approaches. The relative importance of the eddy heat transport to the total transport is estimated to be only about 5% and thus it can be neglected in a first approximation. The salt transport estimates show a net input, suggesting a salinity increase during the period of study; this was confirmed from the long-term salinity data in the Southern Adriatic.
0148-0227
C09009
Yari, Sadegh
d0c88dfe-8e2c-4816-a1ce-0565c5109092
Kovačević, Vedrana
95d6a03b-8423-4b48-94d4-3f9c818698bd
Cardin, Vanessa
53852e8c-5352-4bc7-94d1-cfdb39ce4312
Gačić, Miroslav
7531db12-4026-48e1-a057-24fc1b3a00a6
Bryden, Harry L.
7f823946-34e8-48a3-8bd4-a72d2d749184
Yari, Sadegh
d0c88dfe-8e2c-4816-a1ce-0565c5109092
Kovačević, Vedrana
95d6a03b-8423-4b48-94d4-3f9c818698bd
Cardin, Vanessa
53852e8c-5352-4bc7-94d1-cfdb39ce4312
Gačić, Miroslav
7531db12-4026-48e1-a057-24fc1b3a00a6
Bryden, Harry L.
7f823946-34e8-48a3-8bd4-a72d2d749184

Yari, Sadegh, Kovačević, Vedrana, Cardin, Vanessa, Gačić, Miroslav and Bryden, Harry L. (2012) Direct estimate of water, heat, and salt transport through the Strait of Otranto. Journal of Geophysical Research, 117 (C9), C09009. (doi:10.1029/2012JC007936).

Record type: Article

Abstract

The transport of water volume, salt and heat was calculated using continuous measurements of currents in the Otranto Strait for a one-year period in 1994–95. Temperature and salinity data sets, available from five hydrographic surveys, were used to obtain the seasonal temperature and salinity distributions at the Otranto transect. The Variational Inverse Method (VIM) was applied to reconstruct spatial distributions of the de-tided low-pass inflowing current component, salinity and temperature. Errors associated with estimates of transports are influenced by the data coverage: the higher the spatial resolution, the smaller the error and vice versa. Volume transport reaches a maximum in winter and spring and attains its minimum in summer. The obtained volume transport [?1 Sv (106 m3s?1)] should be considered a lower limit value since in that period the Adriatic was producing relatively small quantities of deep water due to the inflow of low-salinity (high buoyancy) waters and relatively mild winters. Comparing the mean advective heat input and the air-sea heat loss, the same order of magnitude between the two has been obtained which is satisfactory considering the possible errors of the two approaches. The relative importance of the eddy heat transport to the total transport is estimated to be only about 5% and thus it can be neglected in a first approximation. The salt transport estimates show a net input, suggesting a salinity increase during the period of study; this was confirmed from the long-term salinity data in the Southern Adriatic.

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More information

Published date: 2012
Organisations: Physical Oceanography

Identifiers

Local EPrints ID: 344366
URI: https://eprints.soton.ac.uk/id/eprint/344366
ISSN: 0148-0227
PURE UUID: f43fa629-c2b5-4cbc-b0f4-e6d6966f2f73
ORCID for Harry L. Bryden: ORCID iD orcid.org/0000-0002-8216-6359

Catalogue record

Date deposited: 19 Oct 2012 10:49
Last modified: 31 Jul 2019 00:50

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