Saturation of Ocean Surface Wave Slopes Observed During Hurricanes

Davis, Jacob R.; Thomson, Jim; Houghton, Isabel A.; Doyle, James D.; Komaromi, William A.; Fairall, Chris W.; Thompson, Elizabeth J.; Moskaitis, Jonathan R.

doi:10.1029/2023gl104139

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Saturation of Ocean Surface Wave Slopes Observed During Hurricanes

2023
By Davis, Jacob R. ; Thomson, Jim ; Houghton, Isabel A. ; ...
Source: Geophysical Research Letters, 50(16)

[PDF-2.26 MB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Davis, Jacob R. ; Thomson, Jim ; Houghton, Isabel A. ; Doyle, James D. ; Komaromi, William A. ; ... More +

Davis, Jacob R. ; Thomson, Jim ; Houghton, Isabel A. ; Doyle, James D. ; Komaromi, William A. ; Fairall, Chris W. ; Thompson, Elizabeth J. ; Moskaitis, Jonathan R. Less -
NOAA Program & Office:

NWS (National Weather Service) ; OAR (Oceanic and Atmospheric Research) ; OSTI (Office of Science and Technology Integration) ; PSL (Physical Sciences Laboratory)

NWS (National Weather Service) ; OAR (Oceanic and Atmospheric Research) ; OSTI (Office of Science and Technology Integration) ; PSL (Physical Sciences Laboratory) Less -
Description:

Drifting buoy observations of ocean surface waves in hurricanes are combined with modeled surface wind speeds. The observations include targeted aerial deployments into Hurricane Ian (2022) and opportunistic measurements from the Sofar Ocean Spotter global network in Hurricane Fiona (2022). Analysis focuses on the slope of the waves, as quantified by the spectral mean square slope. At low‐to‐moderate wind speeds (15 m s−1), slopes continue to increase, but at a reduced rate. At extreme winds (>30 m s−1), slopes asymptote. The mean square slopes are directly related to the wave spectral shapes, which over the resolved frequency range (0.03–0.5 Hz) are characterized by an equilibrium tail () at moderate winds and a saturation tail () at higher winds. The asymptotic behavior of wave slope as a function of wind speed could contribute to the reduction of surface drag at high wind speeds.
Keywords:

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General Earth And Planetary Sciences Geophysics
Source:

Geophysical Research Letters, 50(16)
DOI:

https://doi.org/10.1029/2023gl104139
ISSN:

0094-8276;1944-8007;
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by-nc/4.0/
Rights Information:

CC BY-NC
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Main Document Checksum:

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urn:sha256:db9663e2a5c2a35a3abea51dabcc7c6f79c7713b14538a757cbc3a2ebd77545c
Download URL:

https://repository.library.noaa.gov/view/noaa/59196/noaa_59196_DS1.pdf
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