Question

what are retrieving winds? ​

Answer 1

The velocity–azimuth display (VAD) technique was designed to estimate the areal mean vertical profile of the horizontal wind above a ground-based Doppler radar. The method uses radial velocity observations under the assumption of a linear wind field, though it encounters difficulty when the observations are contaminated by velocity ambiguities, large noise, and when viable data exist only over a restricted azimuthal range. The method suggested in this paper uses gradients of radial velocity, rather than only the velocity itself, to derive wind profiles and thus is termed the gradient velocity–azimuth display (GVAD) technique.

Answer 2

Explanation:

• Fetch is a measurement of distance that indicates how far the wind has traveled over open water.
• For example, if a wind is blowing from east to west across a body of water and there are no obstacles, the fetch of the wind is equal to the east-west distance of the body of water.