| 摘要: |
| 该文基于华北地区太行山东部2008—2018年6—9月的逐小时降水数据，利用K-means客观聚类法对太行山东部降水数据进行客观分类，得到3类不同降水强度类别的降水簇。对这3类降水簇分别从对流层低层到对流层高层的环流形势场进行分析对比，得出最有利于短时强降水发生的环流形势特征场：对流层高层200 hPa西风急流风速大且急流中心向东扩展，急流附近有位势高度槽发展，槽有较强的辐散场；中层500 hPa有强的位势高度槽脊和温度槽脊发展；低层700 hPa有强盛的西南低空急流和闭合的低压气旋性环流，850 hPa层上大部水汽达到饱和，925 hPa层上短时强降水区风向风速变化剧烈，具有明显的风向风速辐合中心、强的低压气旋性环流中心和大范围的暖区。这种由对流层低层向高层的环流配置最有利于短时强降水的发生发展。同时对3类降水簇的地理特征进行对比可以发现，短时强降水易发生于山前。研究结果不仅有助于短时强降水的预报,而且对防灾减灾、水资源利用和社会经济发展具有重要的科学意义和应用价值。 |
| 关键词: 太行山东部；K-means客观聚类；短时强降水；地形作用 |
| DOI： |
| 投稿时间：2022-11-10 |
| 基金项目: |
|
| Analysis of the Characteristic Field of the Circulation Situation of Short-term Heavy Precipitation in the Eastern Part of Taihang |
| JIANG Lan |
| (Zheng'an County Meteorological Bureau of Guizhou Province,Zheng'an 563400 ,China) |
| Abstract: |
| Based on the hourly precipitation data from June to October in the eastern part of Taihang Mountain in North China from 2008 to 2018, this paper uses the K-means objective clustering method to objectively classify the precipitation data in the east of Taihang Mountain, and obtains three types of precipitation intensity categories. Three types of precipitation clusters are respectively from the lower layer of the troposphere to analysis and comparison of the circulation situation field of the upper stratosphere, and the characteristic field of circulation situation that is most conducive to the occurrence of short-term heavy precipitation are obtained: 200 hPa west wind speed of the high-level rapids and the eastward expansion of the center of the rapids, and the development of potential height trough near the rapids which has a strong divergence field； and strong radiation field of the middle 500 hPa have strong potential height trough and temperature trough development; the low-level 700 hPa has strong southwest low-altitude rapids and closed low-pressure cyclonic circulation, the 850 hPa layer has saturated most of the water vapor, and the short-term strong precipitation area on the 925 hPa layer changes dramatically, with obvious wind direction and wind speed convergence center, strong low-pressure cyclonic circulation center and a wide range of warm areas. This circulation configuration from the lower troposphere to the upper level is most conducive to the occurrence and development of short-term heavy precipitation. At the same time, by comparing the geographical characteristics of three types of precipitation clusters, it can be found that short-term heavy precipitation is easy to occur in front of the mountain. This study is not only conducive to the prediction of short-term heavy precipitation, but also has important scientific significance and application value for disaster prevention and mitigation, water resource utilization and social economic development. |
| Key words: eastern Taihang Mountain； K-means objective clustering； short-term heavy precipitation； terrain effect |
