| 影响攀西地区南部的MCC活动特征及发生环境条件 |
| |
| 引用本文： | 李永军,余谙迪,肖昀何,肖微.影响攀西地区南部的MCC活动特征及发生环境条件[J].高原山地气象研究,2021,41(2):32-41. |
| |
| 作者姓名： | 李永军 余谙迪 肖昀何 肖微 |
| |
| 作者单位： | 1.高原与盆地暴雨旱涝灾害四川省重点实验室，成都 610072 |
| |
| 基金项目： | 高原与盆地暴雨旱涝灾害四川省重点实验室科技发展基金项目（SCQXKJQN2020014） |
| |
| 摘 要： | 选取2010~2019年FY-2E静止气象卫星相当黑体亮温（TBB）资料、攀西地区南部24个自动气象站降水观测资料、欧洲中心ERA5再分析资料，对影响攀西地区南部的MCC活动特征及发生环境条件进行研究，结果表明:影响攀西地区南部的MCC出现在6~9月，6月出现频次最高，具有生消迅速、生命史短和空间尺度较小的特点；这类MCC主要初生于川西高原南部和攀西西北部，消亡于攀西南部和云南北部，其移动路径以西北东南向为主，时间上初生于午后，形成于傍晚至前半夜，消亡于次日凌晨至上午；MCC发展形成于高温高湿高能环境中，能产生较强降水的MCC的TBB值较低，在垂直结构上具有低层辐合、高层辐散和上升运动显著的特点，高层的南亚高压脊线和中低层的切变辐合是其主要影响系统；根据攀西地区南部24h最大降雨量，可将影响攀西地区南部的MCC分为大暴雨型、暴雨型、大雨型和小雨型，大暴雨型、暴雨型和大雨型的影响形势相似，高层位于南亚高压东部脊线附近，中层位于低槽尾部区域，低层存在切变辐合；大暴雨型的南亚高压强于暴雨型和大雨型，中层的低值系统较暴雨型和大雨型南压明显，而小雨型在高层位于南亚高压东部脊线南侧的东北气流内，中低层的低值系统位置偏北。
|
| 关 键 词： | 攀西南部 MCC 南亚高压 活动特征 环境条件 |
| 收稿时间： | 2021-04-08 |
Activity Characteristics and Environmental Conditions of MCC Affecting the Southern Part of Panxi Region |
| |
| Institution: | 1.Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China2.Panzhihua Meteorological Observatory, Panzhihua 617000, China |
| |
| Abstract: | Based on the blackbody brightness temperature (TBB) data of FE-2E geostationary meteorological satellite from 2010 to 2019, the precipitation observation data of 24 automatic weather stations in the south of Panxi area, and the reanalysis data of ERA5 from ECMWF, it analyzes the characteristics and environmental conditions of the MCC affecting the southern part of Panxi Region, and the results show that the MCC affecting the southern part of Panxi Region appears from June to September, with the highest frequency in June. It has the characteristics of rapid generation and disappearance, short life history and small spatial scale. MCC affecting southern Panxi Region is mainly born in the southern part of the Western Sichuan Plateau and the northwestern part of Panxi Region, and dies out in the southern part of the Panxi Region and the northern part of Yunnan Province. Its moving paths are mainly from northwest to southeast, born in the afternoon and formed in the evening to the first half of the night, and dies out in the early morning to the morning of the next day. MCC develops and forms in an environment of high temperature, humidity and energy. MCC requires a low TBB value to produce strong precipitation. The high-level South Asian High ridgeline and the shear convergence of the middle and low levels are its main influence system. The vertical structure of the system is characterized by low-level convergence, high-level divergence and significant ascending movement. According to the maximum 24-hour rainfall in the southern of Panxi area, MCC affecting the southern part of Panxi Region can be divided into heavy rain type, rainstorm type, heavy rain type and small rain type. The impact situation of heavy rain type, rainstorm type and heavy rain type is similar. The high-rise is located near the east ridge line of South Asia High, and the middle layer is located in the tail area of low trough, and the lower layer has shear convergence. The South Asia High of heavy rain type is stronger than that of rainstorm type and heavy rain type, and the low value system in middle layer is more obvious than that of rainstorm type and heavy rain type, while the small rain type is located in the upper northeast air flow on the south of the ridge line of the eastern of South Asia High, and the low value system of the middle and low layers is north. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《高原山地气象研究》浏览原始摘要信息 |
| 点击此处可从《高原山地气象研究》下载免费的PDF全文 |
|
