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| Titel |
Physical response of the coastal ocean to Hurricane Isabel near landfall |
| VerfasserIn |
F. M. Bingham |
| 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 ; 3, no. 1 ; Nr. 3, no. 1 (2007-03-26), S.159-171 |
| Datensatznummer |
250000774
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| Publikation (Nr.) |
 copernicus.org/os-3-159-2007.pdf |
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| Zusammenfassung |
| Hurricane Isabel made landfall near Drum Inlet, North Carolina on 18 September
2003. In nearby Onslow Bay an array of 5 moorings captured the response
of the coastal ocean to the passage of the storm by measuring currents,
surface waves, bottom pressure, temperature and salinity. Temperatures
across the continental shelf decreased by 1–3°C, consistent with a
surface heat flux estimate of 750 W/m2. Salinity decreased at most
mooring locations. A calculation at one of the moorings estimates rainfall
of 11 cm and a net addition of fresh water at the surface of 8 cm. The
low-pass current field shows a shelf-wide movement of water, first to the
southwest, with an abrupt reversal to the northeast along the shelf after
landfall. Close analysis of this reversal shows it to be a disturbance
propagating offshore at a speed somewhat less than the local shallow water
wave speed. The high-pass current field at one of the moorings shows a
significant increase in kinetic energy at periods between 10 min and 2 h
during the approach of the storm. This high-pass flow is isotropic and
has a short (<5 m) vertical decorrelation scale. It appears to be closely
associated with the winds, Finally we examined the surface wave field at one
of the moorings. It shows the swell energy peaking well before the wind
waves. At the height of the storm, as the winds rotated rapidly in the
cyclonic sense, the wind wave direction rotated as well, with a lag of
45–90°. |
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