Drop Size Distributions and Radar Observations of Convective and Stratiform Rain over the Equatorial Indian and West Pacific Oceans

摘要: AbstractTwo-dimensional video disdrometer (2DVD) data were analyzed from two equatorial Indian (Gan) and west Pacific Ocean (Manus) islands where precipitation is primarily organized by the intertropical convergence zone Madden–Julian oscillation (MJO). The 18 (3.5) months of 2DVD Manus Island show that 1) sites have similar drop size distribution (DSD) spectra liquid water content, median diameter, rain rate R, radar reflectivity z, normalized gamma number concentration Nw, other integral parameters; 2) there a robust Nw-based separation between convective (C) stratiform (S) DSDs at both produces consistent in parameter spaces.The indicate an equatorial, maritime average C/S rainfall accumulation fraction (frequency) 81/19 (41/59) these locations. It hypothesized frequency estimates are slightly higher than previous radar-based studies, because ubiquitous weak, shallow convec...