干旱区研究

Arid Zone Research >

2023 , Vol. 40 >Issue 9: 1391 - 1403

DOI: https://doi.org/10.13866/j.azr.2023.09.03

Weather and Climate

Objective weather classification of persistent floating dust weather in the Tarim Basin

  • Congzhen ZHU ,
  • Tianliang ZHAO ,
  • Lu MENG ,
  • Xinghua YANG ,
  • Qing HE ,
  • MAMTIMIN Ali
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  • 1. Institute of Desert Meteorology, China Meteorological Administration, National Observation and Research Station of Desert Meteorology, Taklimakan Desert of Xinjiang, Taklimakan Desert Meteorology Field Experiment Station of CMA, Xinjiang Key Laboratory of Desert Meteorology and Sandstorm, Urumqi 830002, Xinjiang, China
    2. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China
    3. School of Geography Science, Shanxi Normal University, Taiyuan 030032, Shanxi, China

Received date: 2023-02-17

  Revised date: 2023-05-16

  Online published: 2023-09-28

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Abstract

This study utilized observational data on floating dust days from multiple stations across the Tarim Basin spanning 2011 to 2020. In total, 396 days characterized by persistent floating dust were selected. Employing ERA5 meteorological reanalysis data, the PCT algorithm was used to objectively classify near-surface and upper-layer circulation patterns associated with persistent floating dust in the Tarim Basin. Furthermore, typical synoptic processes accompanying persistent floating dust were selected for analysis. The aim was to elucidate the relationship between persistent floating dust and synoptic circulation at different altitudes. The findings revealed three distinct near-surface weather patterns during persistent floating dust days: high-pressure front, high-pressure bottom, and uniform pressure field. Variations in meteorological conditions and pollutant concentrations were evident among these surface weather patterns. The near-surface weather system evolved from the high-pressure front to high-pressure bottom, culminating in the uniform pressure field. The upper-layer weather system alternated between the westerly trough type and the high-pressure ridge-zonal latitudinal type. As the Siberian cold high-pressure system moved eastward and southward, upper-layer circulations were influenced by the westerly trough and the Iranian high-pressure system. Persistent floating dust events occurred and developed alongside elevated near-surface PM10 concentrations. These events concluded when a near-surface uniform pressure field prevailed, marked by limited air pressure system activity and an upper-layer circulation characterized by the zonal latitudinal pattern.

Key words： persistent floating dust; objective weather classification; principal component analysis in T-mode; Tarim Basin

Cite this article

Congzhen ZHU , Tianliang ZHAO , Lu MENG , Xinghua YANG , Qing HE , MAMTIMIN Ali . Objective weather classification of persistent floating dust weather in the Tarim Basin[J]. Arid Zone Research, 2023 , 40(9) : 1391 -1403 . DOI: 10.13866/j.azr.2023.09.03

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