Table of Contents
ISRN Meteorology
Volume 2012 (2012), Article ID 296575, 10 pages
Research Article

Analysis of Measured Drop Size Spectra over Land and Sea

1GEOMAR|Helmholtz-Zentrum für Ozeanforschung Kiel, Maritime Meteorologie, Düsternbrooker Weg 20, 24105 Kiel, Germany
2Deutscher Wetterdienst, Albin-Schwaiger-Weg 10, 82383 Hohenpeißenberg, Germany

Received 17 August 2011; Accepted 20 September 2011

Academic Editors: U. Kulshrestha, F. Tao, and D.-Y. Wang

Copyright © 2012 Karl Bumke and Jörg Seltmann. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Drop size spectra were measured by using an optical disdrometer of type ODM 470 at different locations. They were subdivided in to four data sets: measurements over land, in coastal areas, over semienclosed seas, and over the open sea. Based on 1-minute measurement intervals, no differences were found in drop size spectra between continental and maritime areas. An exponential model with a rain rate depending on interception number and prefactor in the exponent fits well the spectra, and maximum drop sizes depend strongly on estimated rain rates. In contrast to other investigations, there are no significant differences between spectra of convective and stratiform rain based on 1-minute measurement intervals. However, spectra integrated over 10 minutes show the expected differences.