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Proceedings Paper

Cloud thermodynamic phase from POLDER/ADEOS: comparison with millimeter wave radar measurements and synoptic weather reports
Author(s): Jerome Riedi; Philippe Goloub; Roger Marchand; Helene Chepfer
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Paper Abstract

A method for cloud top thermodynamical phase determination has been developed, using polarimetric data from the spaceborne instrument POLDER. Eight months of data, corresponding to the POLDER/ADEOS operational period, have now been processed. In our present studies, two complementary approaches were developed to evaluate the accuracy of the cloud phase retrieval algorithm. At the global scale, the POLDER phase information is compared to ground based synoptic weather reports from the Extended Edited Synoptic Cloud Report. This database allows one to select observations of various cloudiness situations (cloud amount and types, multilayer clouds, thin cirrus), which are then compared with matching POLDER observations. The second approach consists in analyzing data from the Millimeter Wave Cloud Radar (Souther Great Plain -- ARM site) which are available for nearly the entire operational POLDER period. The sampling capabilities of the radar (data are acquired every 10 seconds) allows one to compare POLDER cloud top phase with cloud top pressure and temperature, derived from the MMCR data combined with radiosounding measurements. Both approaches show the consistency of the POLDER phase product but also lead to interesting results concerning the cloud phase problem.

Paper Details

Date Published: 8 December 1999
PDF: 10 pages
Proc. SPIE 3867, Satellite Remote Sensing of Clouds and the Atmosphere IV, (8 December 1999); doi: 10.1117/12.373048
Show Author Affiliations
Jerome Riedi, Univ. des Sciences et Technologies de Lille (France)
Philippe Goloub, Univ. des Sciences et Technologies de Lille (France)
Roger Marchand, The Pennsylvania State Univ. (United States)
Helene Chepfer, Institut Pierre Simon Laplace/Ecole Polytechnique (France)

Published in SPIE Proceedings Vol. 3867:
Satellite Remote Sensing of Clouds and the Atmosphere IV
Jaqueline E. Russell, Editor(s)

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