风廓线雷达探测模式组合应用分析

Application analysis of wind profile radar detection mode combination

为了更好地发挥风廓线雷达在高空探测中的优势,本文利用2014—2017年中国科学院大气物理研究所淮南气候环境综合观测试验站(Huainan Climate and Environment Observatory,HCEO)的ST风廓线雷达探测资料,评估在不同探测模式组合下雷达的探测性能,探讨探测气象环境对其影响,研判实际应用中探测模式组合的适用性。结果表明:ST风廓线雷达选用高、低模式与转换高度进行模式组合,可实现不同探测目的,但不同组合的探测性能存在差异,主要呈现两种变化规律:一种是模式转换前探测性能逐渐降低,而转换后迅速升高,进入高模式后随高度逐渐降低;另一种是转换过程中探测性能未发生明显改变,到高模式某一高度后逐渐降低。另外,秋冬季临近转换高度探测性能的降低程度逐渐加大;降水使对流层中低层探测性能降低。因此,可以依据雷达对大气边界层、对流层以及平流层的探测性能,选择合适的探测模式组合。

In order to better exploit the detection advantages of wind profile radar in upper layer,the detection data of ST wind profile radar during 2014-2017 from Huainan Climate and Environment Observatory(HCEO),Institute of Atmospheric Physics,Chinese Acad⁃emy of Sciences,were used to evaluate the detection performance of ST wind profile radar under different detection mode combinations,and the influence of meteorological environment on detection performance was explored.On this basis,the applicability of detection mode combinations was discriminated in practical operations.The results show that ST wind profile radar can achieve different detec⁃tion purposes by combining high or low modes with switching altitude.However,there are differences in detection performance under different combinations of mode.On the one hand,the detection performance of radar gradually decreases before the mode conversion and rapidly increases after the mode conversion,while it gradually decreases with height under the high mode.On the other hand,the detection performance of radar doesn’t change significantly in process of the conversion,while it gradually decreases after the high mode to a certain height.In addition,the reducing degree of detection performance gradually increases as the transition altitude ap⁃proach in autumn and winter.The precipitation reduces the detection performance in lower and middle layers of troposphere.So,we se⁃lect suitable mode combination based on the detection performance of radar to atmospheric boundary layer,troposphere and stratosphere.