2010年安丘一次大暴雨过程的TBB亮温和垂直螺旋度分析

The Analysis of TBB Bright Temperature and Vertical Helicity in the Heavy Rain at Anqiu in 2010

为了深入了解鲁中山区等地夏季暴雨发生机制,进一步提高预报准确率,利用FY-2E卫星TBB资料和NCEP/NCAR1°×1°的6 h再分析资料,对潍坊安丘市2010年7月18日一次大暴雨过程进行天气动力学诊断和TBB云图分析。结果表明,此次安丘大暴雨是由副热带高压、高空槽和地面气旋等系统共同影响产生;TBB低值强云团随云带沿低空急流方向移动,且与水汽及能量输送带密切关联,暴雨发生在TBB亮温低值区的北侧,不稳定能量在安丘地区上空得到释放;垂直螺旋度正值中心的变化对地面气旋中心的变化有很好的指示意义。

In order to insight into the mechanism of summer rainstorm occurred in central Shandong Province and improve the prediction accuracy further, the author used FY-2E satellite TBB data and NCEP/NCAR reanalysis 1°×1°6 h, the Anqiu City on July 18, 2010 diagnosis and TBB to weather dynamics process of a heavy storm cloud image analysis. The results showed that： the Anqiu torrential rain was by the subtropical high and upper trough and ground cyclone system produced by the common effect; TBB strong low clouds with cloud band along the low level jet direction, and closely associated with water vapor and energy belt, heavy rain occurred in the north of TBB light in low temperature zone, the release of unstable energy in Anqiu area above; vertical spiral degrees when the center position and intensity of cyclone with the ground movement and strength changes had very good corresponding relationship.