Application of QPE Products of an X-band Phased Array Radar in Severe Rainfall
LI Chan-zhu
MO Wei-qiang
XIAN Xing-he
ZHAO Yang-jie
RAO Xiao-qiang
Abstract：The applicability of quantitative precipitation estimation(QPE)product in two different types of rainfall in Dongguan was assessed.The results are shown as follows.The QPE product was able to depict the spatial distribution characteristics of the rainfall of interest though with generally higher-than-ob-served amounts.The radar estimation bias differed with different rain rates,showing moist bias for relatively weak rainfall but dry bias for relatively strong rainfall.Furthermore,the moist bias with weak typhoon rain-fall was smaller than that of monsoon rainfall while the dry bias with strong rainfall was larger that of monsoon rainfall.The specific rain rates at which a moist bias transformed to a dry bias differed with the type of rain-fall,which was mainly due to the difference in 5 min rainfall amounts estimated by the radar QPE when the rainfall was 1 to 2 mm with all types of rainfall.For the two study processes,the radar QPE had higher esti-mation accuracy for rain rates above 10 mm/h.As compared with the R(ZH)relationship,the radar QPE did a better job in reflecting the strengthening and weakening of rainfall,particularly better for relatively strong rainfall.It should have a reference value better than it is now in intense rainfall pre-warning.
Keywords：X-band phased array radarquantitative precipitation estimationdual-polarizationin-tense rainfall
Publication Date：2023-12-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 43-48 )