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Water-mass transformations in a neutral density framework and the key role of light penetration

Water-mass transformations in a neutral density framework and the key role of light penetration
Water-mass transformations in a neutral density framework and the key role of light penetration
A new formulation is proposed for the evaluation of the dianeutral transport in the ocean. The method represents an extension of the classical diagnostic approach for estimating the water-mass formation from the buoyancy balance. The inclusion of internal sources such as the penetrative solar shortwave radiation (i.e., depth-dependent heat transfer) in the estimate of surface buoyancy fluxes has a significant impact in several oceanic regions, and the former simplified formulation can lead to a 100% error in the estimate of water-mass formation due to surface buoyancy fluxes. Furthermore, internal mixing can also be overestimated in inversions of in situ data when the shortwave radiation is not allowed to be penetrative.
The method examines the evolution equation of neutral density via the tendencies of potential temperature and salinity. The neutral density framework does not require the choice of a reference pressure and thus, unlike previous approaches that consider potential density, it is well suited for examining the whole open-ocean water column.
The methodology is easy to implement, particularly for ocean numerical models. The authors present here its application to a long simulation made with an ice–ocean global model, which allowed the method to be validated.
0022-3670
1357-1376
Iudicone, Daniele
e126ed06-8bab-4971-abf1-98a0d5f9dc7f
Madec, Gurvan
ffb28deb-4bbd-4a4c-914f-492f813e4864
McDougall, Trevor J.
06a3853b-ba2c-4203-8a7d-34dd0e0a8836
Iudicone, Daniele
e126ed06-8bab-4971-abf1-98a0d5f9dc7f
Madec, Gurvan
ffb28deb-4bbd-4a4c-914f-492f813e4864
McDougall, Trevor J.
06a3853b-ba2c-4203-8a7d-34dd0e0a8836

Iudicone, Daniele, Madec, Gurvan and McDougall, Trevor J. (2008) Water-mass transformations in a neutral density framework and the key role of light penetration. Journal of Physical Oceanography, 38 (7), 1357-1376. (doi:10.1175/2007JPO3464.1).

Record type: Article

Abstract

A new formulation is proposed for the evaluation of the dianeutral transport in the ocean. The method represents an extension of the classical diagnostic approach for estimating the water-mass formation from the buoyancy balance. The inclusion of internal sources such as the penetrative solar shortwave radiation (i.e., depth-dependent heat transfer) in the estimate of surface buoyancy fluxes has a significant impact in several oceanic regions, and the former simplified formulation can lead to a 100% error in the estimate of water-mass formation due to surface buoyancy fluxes. Furthermore, internal mixing can also be overestimated in inversions of in situ data when the shortwave radiation is not allowed to be penetrative.
The method examines the evolution equation of neutral density via the tendencies of potential temperature and salinity. The neutral density framework does not require the choice of a reference pressure and thus, unlike previous approaches that consider potential density, it is well suited for examining the whole open-ocean water column.
The methodology is easy to implement, particularly for ocean numerical models. The authors present here its application to a long simulation made with an ice–ocean global model, which allowed the method to be validated.

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Published date: July 2008

Identifiers

Local EPrints ID: 59050
URI: http://eprints.soton.ac.uk/id/eprint/59050
ISSN: 0022-3670
PURE UUID: 653e5b4a-71cc-469c-b0e1-32f210356aa2

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Date deposited: 21 Aug 2008
Last modified: 15 Mar 2024 11:13

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Contributors

Author: Daniele Iudicone
Author: Gurvan Madec
Author: Trevor J. McDougall

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