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机构地区:[1]解放军理工大学气象海洋学院,江苏南京211101
出 处:《成都信息工程学院学报》2013年第1期24-28,共5页Journal of Chengdu University of Information Technology
基 金:南京雷达气象与强天气开放实验室研究基金(BJG201209);武汉暴雨开放基金(IHR2009G02)资助
摘 要:针对风廓线雷达资料分辨率高但目前业务应用不广泛的问题,通过对2006年6月29日一次因飑线天气引发的强降水的观测,分析水平风场、垂直气流和大气虚温的变化,以及高低空急流出现的时机并结合地面观测实况,探讨风廓线雷达资料在此类天气过程中的应用。结果表明,水平风场可以清晰地显示高空急流和低空急流出现的时刻和高度,高空急流区和低空急流区不断发展并相互靠近可以预示阵风锋的到来;垂直速度正值突然增大(气流向上为正,向下为负)并迅速变成负值是判断阵风锋过境的一个依据,同时也预示降水即将开始;另外,高空温度递减率的突然加大对降雨的出现也有一定的预示作用。To the question that the data detected by profiler is not used widely in operation at present although its spa- tial and time resolution is high, a heavy rain caused by a squall on June 29, 2006 was observed, the horizontal wind, vertical flow, virtual temperature and the time of jet appeared at upper-level and low-level were analyzed combined the state of ground, performance of data detected by profiler in such a squall weathe is discussed. It shows that the time and height of jet can be displayed clearly in horizontal wind. It is the upper-level jet and low-level jet growing up and the areas of jets near each other that can indicate the front coming. That the plus vertical velocity increasing sharply (plus for updraft and minus for downdraft), and then becoming minus quickly can be a criterion to judge the squall passing, and also can be used to indicate the coming precipitation. At the other hand that the lapse rate in up- per air increases sharply can also denote the coming precipitation.
分 类 号:P458.121[天文地球—大气科学及气象学]
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