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乌鲁木齐和成都两地机场雷暴降水水汽条件的分析研究
许皓琳, 郑佳锋, 张杰, 朱克云, 黎倩
(成都信息工程大学)
Analysis and Research on Water Vapor Conditions of Thunderstorm Precipitation in Urumqi and Chengdu Airports
xuhaolin, zhengjiafeng, zhangjie, zhukeyun, liqian
(Chengdu University of Information Technology)
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投稿时间:2019-10-15    修订日期:2020-09-27
中文摘要: 地基微波辐射计高时间分辨率的水汽密度、积分水汽含量(water vapor content,V)和液态水路径(liquid water path,L)等资料在强对流降水预警预报和研究中具有重要应用潜力和价值。本文利用这些资料研究了乌鲁木齐和成都两地机场的两次雷暴降水前后不同阶段的水汽分布、水汽演变和汽-液转化等:乌鲁木齐7.4雷暴过程中,在水汽输送和垂直运动的作用下,低层水汽密度在降水前显著升高,于降水后迅速恢复。成都7.15雷暴降水前,整层水汽经历了先增加后减小的演变过程,水汽积累过程中,最大增量达4.99 g·m-3;水汽转化过程中,整层水汽迅速减小,其中水汽密度在云层高度上减小量更大。云中水汽含量(cloud water vapor content,IWVc)对降水起止的指示效果优于V和L。乌鲁木齐7.4降水前,IWVc分别增大1.8倍和2.2倍,降水结束后,IWVc迅速减小;成都7.15降水前,IWVc分别增大1.3倍和1.5倍,强降水期间,云中水汽增长的速度低于水汽转化速度。此外,IWVc的增减对两地降水强度也有较好指示。乌鲁木齐7.4稳定性降水中:IWVc增加时,地面降水强度随之增大,且云中水汽的增量越大,地面降水强度越大;IWVc减小时段,降水量均低于0.01 mm。成都7.15阵性降水中:IWVc的积累提前于地面降水的发生,IWVc累积的越多,之后地面降水越强。后期逐渐转为稳定性降水时,IWVc和地面降水又恢复到同增减的关系,IWVc增减量的减小也预示了降水的减弱和结束。
Abstract:The high-resolution water vapor density, integral water vapor content(V)and liquid water path(L)measured by ground-based microwave radiometer have important application potential and value in the prediction and research of strong convective precipitation. The paper uses these data to study the water vapor distribution, evolution and vapor-liquid conversion in different stages before and after the two thunderstorms that happened in Urumqi and Chengdu airports: during the 7.4 thunderstorm in Urumqi, under the action of water vapor transport and vertical motion, the low-level water vapor density significantly increased before precipitation and recovered rapidly after precipitation. Before the 7.15 thunderstorm precipitation in Chengdu, the whole layer of water vapor experienced the evolution process of increasing first and then decreasing. During the process of water vapor accumulation, the maximum increment was 4.99 g·m-3. During the process of water vapor conversion, the whole layer of water vapor decreased rapidly. The water vapor density decreases more at the height of the cloud. The cloud water vapor content (IWVc) inversion in the text is better than V and L in indicating the start and end of precipitation. Before Urumqi 7.4 precipitation, IWVc increased by 1.8 times and 2.2 times, respectively. After the precipitation ended, IWVc decreased rapidly. Before the precipitation in Chengdu 7.15, IWVc increased by 1.3 times and 1.5 times, respectively. During strong precipitation, the growth rate of water vapor in the cloud was lower than that of water vapor. In addition, the increase or decrease of IWVc can also be good indicators for the precipitation intensity of two thunderstorm processes. For the stable precipitation of Urumqi 7.4 thunderstorm, when the IWVc increases, the ground precipitation intensity also increases, and the greater increase of water vapor in the cloud, the greater ground precipitation intensity observed; when the IWVc decreases, the precipitation is less than 0.01 mm. For the convective precipitation of Chengdu 7.15 thunderstorm, the accumulation of IWVc is ahead of the occurrence of surface precipitation. The more IWVc accumulates, the stronger the ground precipitation happens. After turning into stable precipitation, the relationship between IWVc and ground precipitation returned to the same increase and decrease, and the decline of IWVc increment or decrement also predicted the decrease and end of the precipitation.
文章编号:201910150375     中图分类号:    文献标志码:
基金项目:国家自然科学基金(41705008)、江苏省气象科学研究所北极阁基金(BJG201901)和成都信息工程大学人才引进项目(KYTZ201724)
引用文本:
许皓琳,郑佳锋,张杰,朱克云,黎倩,0.[en_title][J].Meteor Mon,():-.
xuhaolin,zhengjiafeng,zhangjie,zhukeyun,liqian,0.Analysis and Research on Water Vapor Conditions of Thunderstorm Precipitation in Urumqi and Chengdu Airports[J].Meteor Mon,():-.