NDLI: Breaking waves effects on scatterometer and radiometer signatures of the ocean

Content Provider	IEEE Xplore Digital Library
Author	Plant, W.J. Irisov, V.
Copyright Year	2013
Description	Author affiliation: Appl. Phys. Lab., Univ. of Washington, Seattle, WA, USA (Plant, W.J.) \|\| ZelTech/NOAA, Boulder, CO, USA (Irisov, V.)
Abstract	Active and passive microwave signatures of the ocean depend on the ocean wave spectrum alone if bound and breaking waves are neglected. History has not been kind to attempts to explain both radiometer brightness temperatures $(T_{b})$ and the normalized radar cross section $(σ_{o})$ of the sea using the same ocean wave spectrum. In this paper, we show that bound and breaking waves can be included in previous models of radiometer and scatterometer microwave signatures of the ocean to allow a single wave spectrum to explain both $T_{b}$ and $σ_{o}.$ Bound waves are the roughness produced by gently breaking, or crumpling, waves that travel near the speed of the parent wave while breaking waves are more violent. Breaking wave and foam modeling both build on the function $Λ(c_{b})$ introduced by Phillips, which describes the average length of breaking wave fronts on the ocean per unit area as a function of breaker velocity, $c_{b}.$ We model a form for $Λ(c_{b}),$ particularly around its peak, based on experimental shapes, the speed of the interference pattern produced by the wave spectrum, and the balance between wind input and dissipation described by the spectrum and $Λ(c_{b}).$ Thus the wave spectrum completely determines $Λ(c_{b}).$ We show that the result of including bound and breaking waves in radiometer and scatterometer models of oceanic signatures is a much closer fit to data using a single spectrum.
Sponsorship	IEEE Oceanic Eng. Soc.
Starting Page	1
Ending Page	5
File Size	732929
Page Count	5
File Format	PDF
ISBN	9780933957404
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Microwave radiometry Sea surface Surface waves Ocean temperature Brightness temperature Radar cross-sections microwave emission and scattering from the sea surface wave breaking
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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