Reflectivity(Z),radial velocity(Vr)and depolarization ratio(LDR)in weak precipitation in Guangdong were observed by vertical pointed Ka band cloud radar in 2013.The statistical characteristics of bright band (BB)are analyzed and the automatic algorithm to detect BB is developed based on the vertical profiles of Z,Vr and LDR.The sounding data are used to examine the detection algorithm.The results show that the sharp variations patterns of Z and LDR with height and positions with maximum Z and LDR are similar.The ranges with sharp variations of Z,Vr and LDR are corresponding well.The thickness of BB is obvious correlation with Z,variations of Vr and LDR within BB.The updrafts often exist in the top of cloud for bright band case.Vr and LDR are key factors for detection of BB,however sharp variations of Z often occur in the edge of cloud system.The detection algorithm could detect the typical BB and non-BB,the cloud edge and multi-layer cloud could affect the detection algorithm.This work provides the productions for cloud physical research.
LIU Liping
,
ZHOU Miao
. Characteristics of Bright Band and Automatic Detection Algorithm with Vertical Pointed Ka Band Cloud Radar[J]. Plateau Meteorology, 2016
, 35(3)
: 734
-744
.
DOI: 10.7522/j.issn.1000-0534.2014.00160
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