| 姚静,王楠,康磊.副高异常偏西背景下西北一次漏报的雷暴大风中尺度分析*[J].沙漠与绿洲气象,2020,14(6):10~20 |
| 副高异常偏西背景下西北一次漏报的雷暴大风中尺度分析* |
| Mesoscale analysis of an unreported thunderstorm gale in northwest China under the background of subtropical high anomaly to the west |
| 投稿时间：2019-10-28 修订日期：2020-02-12 |
| DOI：10.12057/j.issn.1002-0799.2020.06.002 |
| 中文关键词: 阵风锋 下击暴流 后部入流 风暴参数 |
| 英文关键词:gust front undershoot burst posterior inflow the storm parameters |
| 基金项目:国家自然科学基金41875058，中国气象局项目CMAYBY2019—115 |
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| 中文摘要: |
| 摘要：利用西安多普勒天气雷达、L波段风廓线雷达和加密自动站探测资料，结合天气实况，对2018年7月26日发生在陕西一次副热带高压影响下的的强风暴过程进行了中尺度分析。结果表明：（1）本次强风暴伴随的阵风锋共维持了4h，其中有3h出现7级以上的大风，且最大风力10级。（2）在副热带高压影响下，陕西处于高温、高湿气团中，大气层结极不稳定。（3）此次强风暴在高的对流有效位能环境下（CAPE）下，抬升触发的关键因子是关中地区中尺度辐合线，当初生的对流云团下山后，中尺度辐合线触发的对流风暴形成小范围冷池出流与环境风场形成新的辐合线，加强对流风暴发展。（4）当阵风锋移动过程中遇到前方的对流云团时，将低层暖湿空气抬升，并随着上升气流输送到主体对流风暴中，迅速补充了主体风暴的能量，使得主体风暴再次强烈发展，延长了阵风锋的生命史。 |
| 英文摘要: |
| Abstract:Based on the observation data of xi"an doppler weather radar, l-band wind profiler radar and encrypted automatic station, combined with the weather situation, a mesoscale analysis was conducted on the process of a severe storm under the influence of a subtropical high in shaanxi province on July 26, 2018. The results showed that :(1) the gust fronts accompanied by this severe storm maintained for a total of 4h, among which 3h saw gale of more than 7, and the maximum wind force was 10. (2) under the influence of subtropical high pressure, shaanxi is in a hot and humid air mass, and the atmospheric structure is extremely unstable. (3) the strong storm under the environment of high convection and effective potential energy (CAPE), the rise is the key factor of the trigger the guanzhong area mesoscale convergence line, at the beginning of the convective cloud cluster after down the mountain, mesoscale convergence line triggers convective storms form small range of cold pool outflow and environmental wind field to form a new convergence line, strengthen the development of convective storm. (4) when the gust front meets the convective cloud ahead in the moving process, it lifts the lower warm and humid air and delivers it to the main convective storm along with the updraft, rapidly replenishing the energy of the main storm, making the main storm develop strongly again and extending the life history of the gust front. |
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