Subjects: Geosciences >> Geography submitted time 2024-03-01 Cooperative journals: 《干旱区研究》
Abstract： This study utilized observational data on floating dust days from multiple stations across the TarimBasin 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-surfaceand 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 toelucidate the relationship between persistent floating dust and synoptic circulation at different altitudes. Thefindings revealed three distinct near-surface weather patterns during persistent floating dust days: high-pressurefront, high- pressure bottom, and uniform pressure field. Variations in meteorological conditions and pollutantconcentrations were evident among these surface weather patterns. The near- surface weather system evolvedfrom the high-pressure front to high-pressure bottom, culminating in the uniform pressure field. The upper-layerweather system alternated between the westerly trough type and the high-pressure ridge-zonal latitudinal type. Asthe Siberian cold high-pressure system moved eastward and southward, upper-layer circulations were influencedby the westerly trough and the Iranian high- pressure system. Persistent floating dust events occurred anddeveloped alongside elevated near- surface PM10 concentrations. These events concluded when a near- surfaceuniform pressure field prevailed, marked by limited air pressure system activity and an upper- layer circulationcharacterized by the zonal latitudinal pattern.
Hits
Hits
Downloads
Comment