| 滇西北高原机场一次暴雨过程的水汽输送特征分析 |
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| 引用本文： | 代冰冰,高云峰.滇西北高原机场一次暴雨过程的水汽输送特征分析[J].高原山地气象研究,2020,40(3):29-33. |
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| 作者姓名： | 代冰冰 高云峰 |
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| 作者单位： | 云南机场集团丽江机场气象台,丽江 674100;云南机场集团丽江机场气象台,丽江 674100 |
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| 基金项目： | 云南机场集团有限责任公司创新项目(2018J(336):山地机场雾、降水天气特征研究及预报产品研发应用) |
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| 摘 要： | 利用丽江机场自动观测站资料、NCEP再分析资料,引入HYSPLIT轨迹模式,对丽江机场2019年8月8~9日出现的暴雨过程水汽输送特征进行分析。结果表明,丽江机场此次暴雨天气过程是由孟湾低压和南海台风提供充沛的暖湿水汽,与青藏高压引导南下的冷平流形成不稳定层结,低层辐合、高层辐散和强烈的垂直上升运动是暴雨发生的动力因素。此次暴雨过程水汽输送通道主要有三条,其中两条是由孟湾低压及南海台风带来洋面上的西南水汽输送和东北水汽输送,第三条是来自云南中部的云南本地水汽输送。三支通道中,来自洋面上的两支通道对暴雨的水汽贡献最大,分别为46%和30%,本地通道水汽贡献率最小;在500hPa高度层上,3条通道的水汽贡献率基本相当,600hPa高度层上西南通道和东北通道水汽贡献率均比较大,而700hPa高度层上西南通道水汽贡献率占主导地位。
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| 关 键 词： | 高原机场 暴雨 水汽输送 HYSPLIT模式 水汽贡献率 |
| 收稿时间： | 2020-06-28 |
Analysis of Water Vapor Transport Characteristics during a Rainstorm at Northwestern Yunnan Plateau Airport |
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| Affiliation: | Lijiang Airport Meteorological Station of Yunnan Airport Group Co., Lijiang 674100, China |
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| Abstract: | Using the data from Lijiang Airport's automatic observation station and NCEP reanalysis data,the HYSPLIT trajectory model was introduced to analyze the characteristics of water vapor transport during the rainstorm process on 8-9 August 2019 at Lijiang Airport.The results show that during the rainstorm at Lijiang Airport,the Bay of Bengal storm and the South China Sea typhoon provided abundant warm and humid water vapor,which formed an unstable stratification with the cold advection guided by the Qinghai-Tibet High to the south. Convergence of the low-level,divergence of the high-level,and strong vertical upward movement are the driving factors for the occurrence of the rainstorm. There are three main water vapor transport channels during the rainstorm.Two of which are the southwest water vapor transport and the northeast water vapor transport brought by the low pressure of the Bay of Bengal storm and the South China Sea typhoon.And the third is the local water vapor transport from central Yunnan.Among the three channels,the two channels from the ocean surface contributed the most to the water vapor of the rainstorm,46% and 30% respectively. The local channel has the smallest water vapor contribution rate.On the 500 hPa level,the water vapor contribution rate of the three channels was basically the same. The water vapor contribution rate of the southwest channel and the northeast channel on the 600 hPa level is the largest. While the water vapor contribution rate of the southwest channel on the 700 hPa level is dominant. |
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