一次短时强降水的相控阵阵列天气雷达探测分析
打开文本图片集
Analysis on phased array weather radar detection of a short-term heavy precipitation
WANG Xuejing1， ZOU Chao'， WANG Yurun²， YANG Min1， ZHANG Yongxuan³（1.Jiangsu Meteorological Observation Center，Nanjing 210o19，China；2.Pujiang Meteorological Service，Pujiang322200，China；3.Xiang'an Meteorological Serviceof Xiamen，Xiamen ，China）
AbstractShort-term heavy precipitation is a leading disastrous weather occurring during the warm season in China. This study examines the meso- and small-scale characteristics of short-term heavy precipitation and the configuration of three-dimensional wind field in depth，using the heavy precipitation event of weak synoptic disturbance that occurrd in Shanghai on 29 June 2O22 as a case study. Utilizing observations of X-band phased array weather radar（XAWR），S-band dual-polarization Doppler weather radar，and surface and sounding data，the mechanisms behind this heavy rainfall and its developmental evolution are explored.The findings are as follows.（1）The event is a rainstorm that forms in the warm sector before thecold front，where the shalow cold air from the surface interacts with the warm and humid airflow，creating a mesoscale convergence line that triggers the convection.（2） During this heavy precipitation，the radar echoes experience three merging and intensifications.The first merging increases the echo intensity.In the second merging，multiple cels move towards southeast，and the diffusion of the sinkingairflow from these cells in the lower layer intensifies the near-surface northerlyairflow， continuously generating new cells at the southern edge of the thunderstorm.The multiple cells formed after the third merging move towards northeast，the outflow from the thunderstorm sustains the near-surface northerly airflow，and new cells are generated on the southern side of the echo.（3）The strengthening of southwesterly windsand the weakening of northerly airflow lead toa rapid decline in the radar echo intensity，signaling the end of this short-term heavy precipitation event.
Keywordsshort-term heavy precipitation； X-band phased arry weather radar （XAWR）； weaksynoptic disturbance；meso- and small-scale structure； three-dimensional wind field
0 引言
短时强降水是引发局地灾害的关键因素[1]目前在弱天气强迫形势下，中小尺度对流天气的局地性和突发性为预报的准确度带来挑战[2-3]。（剩余9444字）
