Comparison of the Applicability of Two Provincial Precipitation Analysis Products and ART_1km in Guangdong

WANG Peidong; ZHOU Qinqiang; ZHANG Chunyan; ZHENG Yanping; CHEN Yizhi; HOU Ling; HUANG Guiye

doi:10.16032/j.issn.1004-4965.2025.068

Abstract：Based on precipitation observations from 5 634 meteorological and hydrological stations in Guangdong Province,this study integrated radar quantitative precipitation estimation products using probability density function matching and optimal interpolation.The ART_1km precipitation fusion product was corrected using the space-time multiscale analysis system.Comparison with the domestic similar product ART_1km showed that both methods can effectively enhance product quality through integrating more site observations.The improvement included a reduced false alarm rate for precipitation below 2 mm·h-1 and smaller errors for precipitation over 20 mm·h-1,as well as decreased errors during the main flood season in site observations or topographically complex regions such as the western Leizhou Peninsula,coastal areas of western Guangdong,and mountainous areas of northern Guangdong.According to independent verification of a precipitation process,the fusion of station observations and radar information ere achieved through probability density function matching and optimal interpolation.This approach enhanced overall quality,especially in situations with poor spatial representation of stations,such as sparse sites,extreme and local precipitation.These showed relatively high false alarm rates.The space-time multiscale analysis could well capture the short-wave information of station observations,and had good effects in spatial representation of stations(e.g.,dense sites,continuous and stable precipitation structures,precipitation with low extreme intensity),but with a relatively high missing rate.Both methods exhibited measurable accuracy degradation in complex terrain regions.