AbstractInstrumentation limitations on measured raindrop size distributions (DSDs) and their derived relations and physical parameters are studied through comparison of the DSD measurements during Meiyu season in East China by four collocated instruments, i.e. a two-dimensional video disdrometer (2DVD), a vertically pointing micro rain radar (MRR), and two laser-optical OTT Particle Size Velocity (PARSIVEL) disdrometers (first-generation OTT-1 and second-generation OTT-2). Among the four instruments, the 2DVD provides the most accurate DSD and drop velocity measurements, so its measured rainfall amount has the best agreement with the reference rain gauge. Other instruments tend to miss more small drops (D < 1mm), leading to inaccurate DSDs and a lower rainfall amount. The low rainfall estimation becomes significant during heavy rainfall. The impacts of instrument limitations on the microphysical processes (e.g., evaporation and accretion rates) and convective storm morphology are evaluated. This is important especially for Meiyu precipitation, which is dominated by a high concentration of small drops. Hence, the instrument limitations need to be taken into account in both QPE and microphysics parameterization.
Journal of Atmospheric and Oceanic Technology – American Meteorological Society
Published: Mar 21, 2017
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