摘要
灾害天气研究进展1灾害天气监测1.8 S波段双偏振雷达和X波段相控阵天气雷达中气旋识别结果对比为了比较S波段双偏振雷达资料和X波段相控阵天气雷达资料识别中气旋的差异,结合X波段相控阵天气雷达(XPAR)和S波段双偏振天气雷达(SPOL)及地面观测资料,对比分析了2019年4月19日发生在广州的一次中小尺度天气过程。结果显示:使用的识别算法可以正确识别出中气旋;XPAR的高时空分辨率数据可以弥补SPOL仰角层不足的缺陷,观测到更加完整的中气旋垂直结构,识别结果中的参数也比SPOL更加细致,更精准地揭示了中气旋的短时演变。研究结果表明XPAR对于强天气回波的观测识别性能相比SPOL具有持续时间更长、垂直结构更加精细、正负速度对差值更大、随整个天气过程演变更加细致等优势,有利于对中小尺度天气系统的快速发展、演变开展细致深入的研究。
Advances in Research on Severe Weather 1 Severe weather monitoring technology 1 Severe weather monitoring technology 1.1 A bayes-based approach against sample imbalance to improving the potential forecasts of gale Sample imbalance prevents the Bayesian model from making effective potential forecasts of gale.An approach is thus proposed to modify the Bayesian model to deal with sample imbalance and verified using the 2015−2019 of reanalysis and radar data.
