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| Titel |
A new method for forming approximately neutral surfaces |
| VerfasserIn |
A. Klocker, T. J. McDougall, D. R. Jackett |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 5, no. 2 ; Nr. 5, no. 2 (2009-05-28), S.155-172 |
| Datensatznummer |
250002420
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| Publikation (Nr.) |
 copernicus.org/os-5-155-2009.pdf |
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| Zusammenfassung |
| We introduce a simple algorithm to improve existing density surfaces to
ensure that the resulting surfaces are as close to neutral as possible. This
means the slopes at any point on the surfaces are close to neutral tangent
planes – the directions along which layered stirring and mixing occurs –
minimizing the fictitious diapycnal diffusivity. Inverse techniques and
layered models have been used for decades to understand ocean circulation.
The most-used density surfaces are potential density or neutral density
surfaces. Both these density surfaces and all others produce a fictitious
diapycnal diffusivity to some degree due to the helical nature of neutral
trajectories – with the magnitude of this artificial diffusivity in some
cases being larger than the values measured in the ocean. Here we show how
this error can be reduced by up to four orders of magnitude and therefore
becomes insignificant compared to measured values, thus providing surfaces
which would produce more accurate results when used for inverse techniques. |
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