| 乌鲁木齐暴雪天气的环流配置及中尺度系统特征* |
| |
| 引用本文： | 张俊兰,施俊杰,李伟,罗婧文,魏娟娟.乌鲁木齐暴雪天气的环流配置及中尺度系统特征*[J].新疆气象,2021,15(1):1-8. |
| |
| 作者姓名： | 张俊兰 施俊杰 李伟 罗婧文 魏娟娟 |
| |
| 作者单位： | 汉中市气象局,汉中市气象局,陕西省气象台 |
| |
| 基金项目： | 2020年中国气象局预报员专项（CMAYBY2020-133）；陕西省山洪地质灾害气象保障工程2019年建设项目 |
| |
| 摘 要： | 利用1980-2018年ERA-5全球再分析资料，对汉江流域汉中地区典型暴雨发生前纬向风场变化及天气尺度瞬变波活动(Eliassen-Palm通量特征)进行分析。结果表明：瞬变波EP通量特征分析为汉江流域暴雨潜势预报提供一个有利的参考指标；暴雨发生前，33°N附近200hPa附近有纬向风减速中心，对应200hPa为EP通量辐散区，这种垂直分布模型是暴雨前期有利形势，随着纬向风减速趋势加强，EP通量辐散区扩展并加强，有利于暴雨的发生；7月较之8月，暴雨强度更强、暴雨范围更广、纬向风变化更明显、200hPa以上EP通量辐散更强。若简单地将盛夏暴雨整体进行研究，会影响对不同月份瞬变波活动及大气环流变化趋势的诊断，造成诊断偏差且难以准确反映瞬变波与暴雨的联系。因此在讨论盛夏季天气尺度瞬变波与对流层环流的相互作用时，应针对不同月份分开进行讨论。
|
| 关 键 词： | 汉江流域 暴雨 瞬变波 EP通量 |
| 收稿时间： | 2019/11/12 0:00:00 |
| 修稿时间： | 2020/1/13 0:00:00 |
Atmospheric circulation and Meso-scale System Characteristics of Urumqi Blizzard |
| |
| Zhang Junlan,and.Atmospheric circulation and Meso-scale System Characteristics of Urumqi Blizzard[J].Bimonthly of Xinjiang Meteorology,2021,15(1):1-8. |
| |
| Authors: | Zhang Junlan and |
| |
| Institution: | Xinjiang Meteorological Observatory,,,, |
| |
| Abstract: | Based on the ERA-5 global reanalysis data from 1980 to 2018, the zonal wind field changes and weather scale transient wave activity (Eliassen-Palm flux characteristics) before the typical heavy rain occurred in the Hanzhong area of the Hanjiang River Basin were analyzed. The results show that the transient flux Eliassen-Palm flux (EP flux) characteristics analysis provides a favorable reference index for the rainstorm potential forecast in the Hanjiang River Basin. Before the rainstorm occurs, there is a zonal wind deceleration center near 200hPa near 33°N, corresponding to 200hPa for EP flux divergence. District, this vertical distribution model is a favorable situation in the early rainstorm period. As the zonal wind deceleration trend is strengthened, the EP flux divergence zone expands and strengthens, which is conducive to the occurrence of heavy rain. in July, the intensity of rainstorm is stronger than that in August. The range of heavy rain is wider, the zonal wind changes more obviously, and the weather scale transient wave EP flux divergence above 200hPa is stronger. If we simply study the summer rainstorm as a whole, it will affect the diagnosis of weather scale transient wave activity and atmospheric circulation trends in different months, which will cause diagnostic bias and it is difficult to accurately reflect the relationship between transient waves and heavy rain. Therefore, when discussing the interaction between the transient summer weather scale transient wave and the tropospheric circulation, it should be discussed separately for different months. |
| |
| Keywords: | Hanjiang River Basin rainstorm transient wave EP flux |
|
| 点击此处可从《新疆气象》浏览原始摘要信息 |
| 点击此处可从《新疆气象》下载免费的PDF全文 |
|
