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Article Dans Une Revue Physics and chemistry of the earth. Part B: Hydrology, oceans and atmosphere Année : 2000

Microphysical observations during FASTEX from airborne doppler radar and in-situ measurements

Résumé

A major objective of FASTEX is to document the three-dimensional dynamic and microphysical structure of the North-Atlantic frontal cyclones in their mature stage at different scales of motion. In this paper, we combine the airborne Doppler radar and microphysical 2D-C and 2D-P probes data to recover the 3D microphysical and radiative properties of the IOP16 and IOP12 frontal cyclones (terminal fall velocity, cloud and precipitation water contents, precipitation fall rate, effective radius). The first step is to derive statistical relationships between the microphysical quantities and reflectivity from the 2D-P and 2D-C probes. Then, the Doppler-derived 3D reflectivity field is combined with these statistical relationships to access the 3D microphysical fields. However, before completing these steps, it is mandatory (i) to get an absolute calibration of the radar, and (ii) to determine the type of ice particles. For this purpose, we developed a new statistical method to retrieve statistical relationships between terminal fall speed and reflectivity from Doppler radar data. It is shown that the comparison between the radar-derived and in-situ reflectivities and statistical relationships in liquid and ice phases permit to overcome those two problems.

Dates et versions

hal-01660290 , version 1 (10-12-2017)

Identifiants

Citer

Alain Protat, Yvon Lemaître, Dominique Bouniol, R. Black. Microphysical observations during FASTEX from airborne doppler radar and in-situ measurements. Physics and chemistry of the earth. Part B: Hydrology, oceans and atmosphere, 2000, 25 (10-12), pp.1097 - 1102. ⟨10.1016/S1464-1909(00)00159-3⟩. ⟨hal-01660290⟩
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