Journal
JOURNAL OF HYDROMETEOROLOGY
Volume 18, Issue 3, Pages 753-760Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JHM-D-16-0127.1
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Funding
- Ministerio de Economia y Competitividad [CGL2013-48367-P, CGL2016-80609-R]
- Ministerio de Ciencia e Innovacion [UNCM08-1E-086]
- CYTEMA (UCLM)
- NASA Precipitation Science
- GPM programs
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Laser disdrometers measure the particle size distribution (PSD) of hydrometeors through a small cross-sectional (tens of square centimeters) surface. Such a limited area induces a sampling effect in the estimates of the PSD, which translates to error in the reflectivity-rain-rate (Z-R) relationship used for ground radar estimates of rainfall, estimates of kinetic energy of precipitation, and any other hydrometeorological application relying on particle size information. Here, the results of a dedicated experiment to estimate the extent of the effect of limited area sampling of rainfall are presented. Using 14 Parsivel, version 1 (Parsivel-1), disdrometers placed within 6 m(2), it was found that the combined area of at least seven disdrometers is required for the estimates to start converging to a stable value. The results can be used to quantify the degree of over-/underestimation of precipitation parameters for a single instrument due to the limited collecting area effect. It has been found that a single disdrometer may underestimate instantaneous rain rate by 70%.
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