Identification

Title

Polarimetric radar analysis of rain drop size variability in maritime and continental clouds

Abstract

During the Queensland Cloud Seeding Research Program the CP2 polarimetric radar parameter differential radar reflectivity (Zdr) was used to examine the rain drop size evolution in both maritime and continental clouds. The focus of this paper is to examine the natural variability of the drop size distribution. The primary finding is that there are two basic rain drop size evolutions, one associated with continental air masses characterized by relatively high aerosol concentrations and long air trajectories over land and the other with maritime air masses with lower aerosol concentrations. The size evolution difference is during the growth stage of the radar echoes. The differential radar reflectivity in the growing continental clouds is dominated by large rain drops, whereas in the maritime clouds differential reflectivity is dominated by small rain drops and drizzle. The drop size evolution in many of the maritime air masses was very similar to those observed in the maritime air of the Caribbean observed with the NCAR S-band polarimetric radar (S-Pol) during the Rain In Cumulus over the Ocean (RICO) experiment. Since the tops of the Queensland continental clouds ascended almost twice as fast as the maritime ones in their growth stage, both dynamical and aerosol factors may be important for the systematic difference in drop size evolution. Recommendations are advanced for future field programs to better understand the causes for the observed variability in drop size evolution. Also considering the natural variability in drop size evolution comments are provided on conducting and evaluating cloud seeding experiments.

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document

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http://n2t.net/ark:/85065/d76d5tg7

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eng

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geoscientificInformation

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publication

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2016-01-01T00:00:00Z

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publication

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2011-09-01T00:00:00Z

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Copyright 2011 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.

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OpenSky Support

organisation name

UCAR/NCAR - Library

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PO Box 3000

Boulder

80307-3000

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opensky@ucar.edu

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http://opensky.ucar.edu/

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