Improved electromagnetic bias theory

Type Article
Date 2000
Language English
Author(s) Elfouhaily T, Thompson Dr, Chapron Bertrand, Vandemark D
Affiliation(s) Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA.
IFREMER, Ctr Brest, Dept Oceanog Spatiale, F-29280 Plouzane, France.
NASA, Goddard Space Flight Ctr, Lab Hydrospher Proc, Wallops Island, VA 23337 USA.
Source Journal Of Geophysical Research Oceans (0148-0227) (Amer Geophysical Union), 2000 , Vol. 105 , N. C1 , P. 1299-1310
WOS© Times Cited 34
Abstract In this paper we describe modifications to a previous theory for the altimeter electromagnetic bias (EM bias) of Srokosz [1986]. A major correction introduces a scaling of Srokosz's model by nonnegligible dimensionless ratios that depend on the slope variance of both long and short waves. With these modifications the EM bias is no longer simply a function of the cross skewness between surface elevation and slope but now depends on the variance ratios that represent the modulation between short and long waves, Inclusion of these ratios can reduce previous EM bias estimates by as much as 50%. Different directions for the longwave and shortwave field are also accounted for in the two-dimensional development of our approach. A radar frequency dependence consistent with observation is also predicted by the new model. Derivation extending our development to the next higher order in wave statistics is also presented and discussed.
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Elfouhaily T, Thompson Dr, Chapron Bertrand, Vandemark D (2000). Improved electromagnetic bias theory. Journal Of Geophysical Research Oceans, 105(C1), 1299-1310. Open Access version :