Discussion
Dual polarisation radar improves rainfall estimation chiefly by
Answer: D
Correct answer: revealing the shape and hence the size of the drops
A dual polarisation radar transmits and receives in both horizontal and vertical planes, and because a falling drop flattens in proportion to its size, the difference between the two returns reports the drop shape. That gives the size distribution the reflectivity alone cannot, so the rain rate can be estimated without assuming a single relationship, and hail, snow and melting particles can be told apart.
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