Wind retrieval and ERS-1 scatterometer radar backscatter measurements

Computer Science

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Scientific paper

Calibration and validation activities for the ERS-1 scatterometer have been carried out at ECMWF, complementary to the ``Haltenbanken'' field campaign. At a Numerical Weather Prediction (NWP) centre a wealth of verifying data is available both in time and space. By using the data and resources available at a NWP centre, it is possible to contribute extensively to a satellite instrument calibration and validation exercise. We estimated noise, and characterised the scatterometer measurements in relation to wind speed and direction. The antennae configuration of the ERS-1 scatterometer proved to be crucial for this work. It is shown that measurement noise is low and that a solution surface is generally well-defined in 3D measurement space except at low wind speed at the inner edge of the swath. We reformulated ESA's pre-launch transfer model CMOD2, and also propose revision of existing wind retrieval schemes. The changes implemented so far at ECMWF clearly improve the accuracy of wind retrieval from the scatterometer.

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