两种垂直风廓线的对比及应用Ⅰ:一致性分析  

Comparison and Application of Two Kinds Vertical Wind Profile Data PartⅠ: Consistency Analysis

作　　者：董新宁[1] 方德贤 周国兵[3] 吴钲 张勇 黄安宁[5] 

机构地区：[1]重庆市气候中心,重庆401147 [2]重庆市气象科学研究所,重庆401147 [3]重庆市气象局,重庆401147 [4]重庆市气象台,重庆401147 [5]南京大学大气科学学院,南京210023

出　　处：《高原气象》2017年第3期788-800,共13页Plateau Meteorology

基　　金：公益性行业(气象)科研专项(GYHY201206028);重庆市科委基础与前沿研究计划项目(cstc2015jcyj A00039);重庆市气象局科技计划项目(2008E13SF188)

摘　　要：利用2013年1—9月重庆多普勒天气雷达(CINRAD/SA)和风廓线雷达(TWP8-L)观测到的垂直风廓线数据,就不同高度、不同时间及不同降水条件下二者的一致性进行了分析。研究结果表明:(1)多普勒雷达探测的风廓线资料与同期的风廓线雷达资料在垂直分布和时间变化上表现出较一致的变化趋势,两者探测的风向和风速的相关系数分别为0.90和0.75;(2)风廓线雷达和多普勒雷达探测的风向相关性(标准误差)随高度增加(降低)而逐渐增加(降低),两者间的一致性随高度不断增强。风速间的相关性也随高度增加而增加,但标准误差变化不大,稳定在2~4 m·s-1之间。在不同月份表现出类似的特征,特别是在汛期(6—9月)风切变从底层到高空具有很好的一致性,呈顺时针旋转;(3)两种探测资料间的一致性受降水影响明显,相对于降水偏少的冬季(1月和2月),在以小到中雨为主的春季(3—4月)以及中到大雨的主汛期(6—9月),多普勒天气雷达和风廓线雷达探测风廓线间的一致性得到明显增强,特别是在主汛期两者间的一致性是最高的;(4)多普勒雷达和风廓线雷达各高度层平均风向随高度的变化一致性较好,在低层(<4 km)和高层(>5 km)风向均随高度顺时针旋转。Based on the wind vertical profile data observed by Doppler radar（ SA） and wind profile radar（TWP8-L） over Chongqing,China during 2013,the characteristics and evolution of wind profiles under four different weather conditions（i.e.,clear sky,light rainfall,moderate rainfall and heavy rainfall） have been studied.The main results show that：（1） Under the weather condition of clear sky or light rainfall,the moisture condition is so weak that the wind vertical profiles observed by Doppler radar are mostly identified as＂ND＂（No Data） and wind speeds（directions） observed by wind profile radar are weak（ill-organized）. Meanwhile,the observed vertical wind shears are weak and ill-organized as well,unfavorable for the development and maintenance of convection systems;（2） As for moderate rainfall,precipitation property is dispersed with weak hourly accumulated precipitation amount. The wind directions in lower levels are ill-organized,while consistent southwesterlies prevail over the middle-upper levels with unified directions of vertical wind shears. All the above conditions are favorable for the development and persistence of convection systems;（3） As for heavy rainfall,the wind vertical profiles observed by Doppler radar present good consistency with those observed by those by the wind profile radar. During the period preceding the heavy rainfall events,the easterlies at the lower level gradually change to westerlies at the higher level. Such change favors to trigger convection activity. During the precipitation period,the vertical wind shears with consistent directions and the low-level jets prevailing at the lower-middle levels favor the maintenance of convection systems. At the end of precipitation events,the decreased wind speeds and northerlies at the lower-middle levels lead to disperse of the convection systems.

关 键 词：垂直风廓线 相关性 线性回归 

分 类 号：P412.25[天文地球—大气科学及气象学]