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冰川冻土 ›› 2023, Vol. 45 ›› Issue (1): 94-107.doi: 10.7522/j.issn.1000-0240.2023.0006

• 冰冻圈与全球变化 • 上一篇    下一篇

天山北坡暴雪过程水汽特征分析

张林梅1(), 苏亚乔1, 庄晓翠2()   

  1. 1.新疆维吾尔自治区气象台,新疆 乌鲁木齐 830002
    2.新疆阿勒泰地区气象局,新疆 阿勒泰 836500
  • 收稿日期:2022-07-11 修回日期:2022-10-20 出版日期:2023-02-28 发布日期:2023-02-25
  • 通讯作者: 庄晓翠 E-mail:1372419282@qq.com;zxcxjalt@163.com
  • 作者简介:张林梅,高级工程师,主要从事灾害性天气机理研究. E-mail: 1372419282@qq.com
  • 基金资助:
    新疆维吾尔自治区自然科学基金项目(2021D01A01)

Analysis of water vapor characteristics in snowstorm process on the northern slope of Tianshan Mountains

Linmei ZHANG1(), Yaqiao SU1, Xiaocui ZHUANG2()   

  1. 1.Meteorological Observatory of Xinjiang Uygur Autonomous Region, Urumqi 830002, China
    2.Xinjiang of Aletai Meteorological Bureau, Altay 836500, Xinjiang, China
  • Received:2022-07-11 Revised:2022-10-20 Online:2023-02-28 Published:2023-02-25
  • Contact: Xiaocui ZHUANG E-mail:1372419282@qq.com;zxcxjalt@163.com

摘要:

利用2000—2020年(9月—次年4月)天山北坡16个国家级气象观测站逐日降水量资料筛选出28次暴雪天气过程,再运用NCEP/NCAR再分析资料以及HYSPLIT模式模拟暴雪过程水汽的后向追踪运动轨迹,分析天山北坡暴雪过程环流背景及主要水汽来源、输送及其对暴雪的贡献。研究表明:天山北坡暴雪区位于300 hPa高空西南急流轴右侧、500 hPa西西伯利亚低槽前西南气流、700 hPa低空西南急流出口区前部辐合区、水汽通量散度辐合区及地面冷锋附近的重叠区域。影响天山北坡暴雪的水汽源地主要为地中海和黑海及其附近、西南亚、中亚、大西洋及其沿岸,850 hPa还有欧洲和北疆的水汽,对暴雪的贡献相对较大,来自北美洲等地的水汽对暴雪的贡献相对较小。各源地水汽随西风气流到达关键区后,在环流适合的条件下,主要沿偏西(西南)、西北路径输入暴雪区,但各层存在一些差异。基于上述特征,建立了天山北坡暴雪过程水汽来源及输送的高低空配置结构,揭示了各高度水汽输送的特征。

关键词: 天山北坡, 暴雪, 水汽特征, HYSPLIT模式

Abstract:

Based on the daily precipitation data of 16 national meteorological observation stations on the northern slope of Tianshan Mountains from 2000 to 2020 (September to April the following year), 28 blizzard weather processes were screened out. Then NCEP/NCAR reanalysis data and HYSPLIT model were used to simulate backward tracking of the water vapor during the snowstorm, analysis of the circulation background of the snowstorm process on the northern slope of the Tianshan Mountains, as well as the main sources and transport of water vapor and its contribution to the snowstorm. The research showed that the snowstorm area in the northern slope of the Tianshan Mountains was located on the right side of the axis of the southwest jet at 300 hPa high, the southwest airflow in front of the West Siberia trough at 500 hPa, the front convergence of the exit area of ?the southwest jet at low level at 700 hPa, and the convergence area of water vapor flux divergence and the overlap near the ground cold front area. The water vapor affecting the blizzard on the northern slope of the Tianshan Mountains mainly came from the Mediterranean Sea, the Black Sea and its vicinity, Southwest Asia, Central Asia, the Atlantic Ocean and its coasts, as well as the 850 hPa water vapor in Europe and northern Xinjiang. The water vapor from North America and other places had a relatively small contribution to the blizzard; after each water vapor source reaches the key area with the westerly airflow, under suitable circulation conditions. It mainly entered the blizzard area along the westward (southwest) and the northwest paths. But there were some differences between the layers. Based on the above characteristics,the structure of the source and transport of water vapor in the snowstorm process on the northern slope of the Tianshan Mountains was established and the characteristics of vapor transport at various heights were revealed.

Key words: northern slope of Tianshan Mountains, snowstorm, characteristic of water vapor, HYSPLIT model

中图分类号: 

  • P534.63