Journal
BOUNDARY-LAYER METEOROLOGY
Volume 136, Issue 3, Pages 365-376Publisher
SPRINGER
DOI: 10.1007/s10546-010-9505-0
Keywords
Air-sea interface; Drag coefficient; Hurricane; Kelvin-Helmholtz instability; Marginal stability
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Funding
- Nova Southeastern University
- National Science Foundation [OCE-0752606]
- Division Of Ocean Sciences
- Directorate For Geosciences [0752606] Funding Source: National Science Foundation
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The lower limit on the drag coefficient under hurricane force winds is determined by the break-up of the air-sea interface due to Kelvin-Helmholtz instability and formation of the two-phase transition layer consisting of sea spray and air bubbles. As a consequence, a regime of marginal stability develops. In this regime, the air-sea drag coefficient is determined by the turbulence characteristics of the two-phase transition layer. The upper limit on the drag coefficient is determined by the Charnock-type wave resistance. Most of the observational estimates of the drag coefficient obtained in hurricane conditions and in laboratory experiments appear to lie between the two extreme regimes: wave resistance and marginal stability.
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