Document Type

Article

Publication Date

10-1-2012

Abstract

Orographic precipitation influences water resources, flooding and landslides, regional climates, and global water budgets. Progress has also been made on thermally driven island convection in the tropics. In contrast, the Dominica Experiment (DOMEX) was designed to study orographic precipitation in the tropics with cumulus triggering by forced ascent in unblocked flow. While many larger tropical islands experience a diurnal cycle in precipitation driven by solar heating, this type of modulation is very small on Dominica. On normal to strong tradewind days, it seems that mechanically forced ascent rather than solar heating triggers the convection and precipitation. The King Air flight pattern consisted of an upstream sounding and six horizontal legs. In the weak wind case, warm thermal boundary layer flow is pushed westward to the vicinity of leg 4 by the prevailing winds. Judging from the latent heat fluxes, the weak wind convection is at least as strong as the strong wind convection.

DOI

10.1175/BAMS-D-11-00194.1

Comments

© Copyright 2012 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 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyrights@ametsoc.org.

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