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中国沙漠 ›› 2023, Vol. 43 ›› Issue (4): 10-16.DOI: 10.7522/j.issn.1000-694X.2022.00164

• • 上一篇    

雅鲁藏布江中游沙尘天气频率及传输过程

拉珍1(), 唐叔乙2, 坚参扎西2, 次珍3, 马鹏飞1()   

  1. 1.西藏自治区气候中心,西藏 拉萨 850000
    2.西藏自治区气象台,西藏 拉萨 850000
    3.西藏自治区气象信息网络中心,西藏 拉萨 850000
  • 收稿日期:2022-11-02 修回日期:2022-12-15 出版日期:2023-07-20 发布日期:2023-08-14
  • 通讯作者: 马鹏飞
  • 作者简介:马鹏飞(E-mail: skyfei029@sina.com
    拉珍(1989—),女,西藏拉萨人,硕士研究生,高级工程师,主要从事生态环境研究。E-mail: lhakdron0920@163.com
  • 基金资助:
    国家自然科学基金项目(42065008);西藏自治区科学技术协会项目“雅江流域沙尘天气的空间联动及动态交互影响定量分析”;西藏自治区“十三五”重点规划项目“雅江北岸易地扶贫搬迁区沙尘监测与预报预警系统建设”

Dust weather diurnal variation and transmission process in the middle reaches of the Yarlung Zangbo River

Lazhen1(), Shuyi Tang2, Zhaxi Jiancan2, Cizhen3, Pengfei Ma1()   

  1. 1.Tibet Climate Center,Lhasa 850000,China
    2.Tibet Meteorological Observatory,Lhasa 850000,China
    3.Information Network Center of Tibet Meteorological Administration,Lhasa 850000,China
  • Received:2022-11-02 Revised:2022-12-15 Online:2023-07-20 Published:2023-08-14
  • Contact: Pengfei Ma

摘要:

利用2017—2020年冬春季(10月至翌年4月)雅鲁藏布江中游的15个气象站逐小时最低能见度数据,基于转移熵方法构建了沙尘传输矩阵,研究雅鲁藏布江中游沙尘天气的日变化特征和空间交互影响过程。结果表明:雅鲁藏布江中游沙尘天气主要出现在山南和日喀则两大宽谷沙源区,具有3~4 h持续性,并具有雅鲁藏布江中游南部白天单峰型、北部上半夜和上午双峰型结构的空间差异性。沙尘在空间上既有跨行政区传输,又在区内相互影响,形成复杂的空间交互过程。区域传输的空间差异主要受地理位置、沙尘源分布和风向风速的影响。两大宽谷和高海拔区作为沙源区不仅显著影响本区的自身和区内传输贡献,而且在西风带作用下对区外的传输贡献也很强,是沙尘传输空间网中重要节点,也是沙尘治理关键区。

关键词: 沙尘, 雅鲁藏布江, 日变化, 转移熵, 空间传输

Abstract:

The middle reaches of Yarlung Zangbo River are the most serious area of dust disaster on the Tibetan Plateau. Using the hourly minimum visibility data of 15 meteorological stations in the middle reaches of the Yarlung Zangbo River from October to April in 2017-2020, a dust transmission matrix was constructed based on the transfer entropy method to study the diurnal variation characteristics and spatial interaction effects of dust weather. The results show that the dust weather mainly occurs in the two wide valley sand source areas of Shannan and Shigaze, with 3-4 h duration and a spatial difference between the single-peak structure with the peak during the day in the south of the Yarlung Zangbo River and the double-peak structure with the peak in the first half of the night in the north. The transfer entropy method can objectively and quantitatively describe the spatial structure of dust weather transmission in the region. Dust has cross-administrative region transmission in space, also influences each other in the region, forming complex spatial interaction influence. The spatial difference of regional transmission is mainly affected by site geography, dust source layout, wind direction and wind speed, the two wide valley and north high altitude area not only significantly affects the site's own and intra-regional transmission contributions, but also contributed very strong outside dust transmission under the action of westerlies. The two wide valleys and high altitude area are not only important nodes in the dust transmission space network, but also key areas of dust control.

Key words: dust, Yarlung Zangbo River, diurnal variation, transfer entropy, spatial transmission

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