基于风廓线网的散度和涡度计算

Calculation of Horizontal Divergence and Vorticity Using Wind Profiler Network

近年来风廓线雷达在全国范围内的建设为预报员提供了更高时空分辨率的实时风场观测资料,介绍了从风廓线网计算水平散度和涡度的三点法的基本原理、算法及两种三点法的等价性。根据上海地区风廓线网中尺度特性,对梅雨期间一次过程进行计算,并与不同资料和差分方法进行了比较,以考察利用风廓线网分析中尺度系统结构的能力。结果表明,在边界层内存在明显正涡度区与负散度区,与此期间发生的降水相配合,误差小于差分方法。

According to the development of wind profiler throughout the country, which provides real time wind observation with higher spatial-temporal resolution for forecasters, we introduce two triangle methods and their equivalence for determining horizontal divergence and vorticity. Since Shanghai wind profiler network is in mesoscale observation network, the diagnosing ability of mesoscale system by using wind profiler network was investigated for a real weather case on Jun. 21, 2014, and the results from different methods were compared. It shows that the two methods obtain a better result that appears distinct areas of positive vorticity and negative divergence a companing with the heavy precipitation at that time.