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| Titel |
Metrics of hurricane-ocean interaction: vertically-integrated or vertically-averaged ocean temperature? |
| VerfasserIn |
J. F. Price |
| 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. 3 ; Nr. 5, no. 3 (2009-09-18), S.351-368 |
| Datensatznummer |
250002583
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| Publikation (Nr.) |
 copernicus.org/os-5-351-2009.pdf |
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| Zusammenfassung |
| The ocean thermal field is often represented in hurricane-ocean interaction
by a metric termed upper Ocean Heat Content (OHC), the vertical integral of
ocean temperature in excess of 26°C. High values of OHC have proven useful
for identifying ocean regions that are especially favorable for hurricane
intensification. Nevertheless, it is argued here that a more direct and
robust metric of the ocean thermal field may be afforded by a vertical
average of temperature. In the simplest version, dubbed T100,
the averaging is from the surface to 100 m, a typical depth of vertical
mixing by a category 3 hurricane. OHC and T100 are well
correlated over the deep open ocean in the high range of OHC, ≥75 kJ cm−2.
They are poorly correlated in the low range of OHC, ≤50 kJ cm−2, in part because OHC is degenerate when evaluated on cool ocean
regions, ≤26°C. OHC and T100 can be qualitatively
different also over shallow continental shelves: OHC will generally indicate
comparatively low values regardless of the ocean temperature, while
T100 will take on high values over a shelf that is warm and
upwelling neutral or negative. In so far as the ocean thermal field alone is
concerned, these warm, shallow continental shelves would appear to be as
favorable for hurricane intensification as are warm, deep ocean regions. |
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