Validation of Two-Dimensional Variational Ambiguity Removal on SeaWinds Scatterometer Data

Two-dimensional variational ambiguity removal in wind scatterometry

Wind scatterometry is an important technique for retrieving high-resolution nearsurface wind information in ocean areas where other techniques provide sparse coverage. Scatterometer winds are principally ambiguous in wind direction. In this paper a variational method for ambiguity removal, named 2DVAR, is presented. 2DVAR performs an incremental analysis based on the ambiguous scatterometer win...

Ocean & Sea Ice SAF VARIATIONAL AMBIGUITY REMOVAL FOR THE SCATTEROMETER ON-LINE PROCESSING (VARSCAT) WP24310

An Assessment of the Nasa Scatterometer Ambiguity Removal Technique

The NASA Scatterometer (NSCAT) estimates the wind speed and direction of near-surface ocean wind. Several possible wind vectors are estimated for each resolution element known as a wind vector cell (wvc). Typically, the speeds of the possible wind vectors are nearly the same, but the directions are very di erent. The correct wind must be distinguished in a step called ambiguity removal. Unfortu...

Correcting SeaWinds Scatterometer Measurements for Atmospheric Attenuation

An attenuation-correction algorithm for the SeaWinds instrument uses the AMSR brightness temperature to find the attenuation experienced by the scatterometer signal. The algorithm uses the concept of excess temperature TeXto evaluate the attenuation. The excess temperature TeXis the difference between the measured brightness temperature and the temperature of the emitting surface. ~e algorithm ...

A Quality Assurance Algorithm for NASA Scatterometer Ambiguity Removal

The recently launched NASA Scatterometer (NSCAT) estimates the wind speed and direction of nearsurface ocean wind. This is done by directing microwaves toward the earth's surface and measuring the backscattered radiation. From this, several possible wind vectors are identified for each point over the swath. The correct wind must be distinguished from these in a step called ambiguity removal. Un...