Calibration of non‐catching precipitation measurement instruments: A review

Non-catching type gauges are the emerging class of in situ precipitation measurement instruments. For these instruments, rigorous testing and calibration more challenging than for traditional gauges. Hydrometeors characteristics like particle size, shape, fall velocity density must be reproduced a controlled environment to provide reference precipitation, instead equivalent water flow used catching-type They generally calibrated by manufacturers using internal procedures developed specific technology employed. No agreed methodology exists, adopted rarely traceable internationally recognized standards. The EURAMET project 18NRM03 ‘INCIPIT’ on ‘Calibration accuracy non-catching instruments measure liquid/solid atmospheric precipitation’, funded European Metrology Programme Innovation Research (EMPIR), was initiated 2019 investigate issues measuring measurement. A survey existing models initially performed this paper provides an overview description their working principles procedures. Both literature works technical manuals disclosed summarized discussed, while current limitations metrological requirements identified.