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1207 / 2024-09-20 16:40:17
Spatiotemporal Evolution of Dust over Tarim Basin Under Continuous Clear-Sky
Dust,Tarim Basin,Continuous clear-sky
Session 25 - IGAC-SOLAS: Chemistry and physics at surface ocean and lower atmosphere
摘要录用
Xiaokai Song / Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
Tian Zhou / Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
Yufei Wang / Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
Xingran Li / Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
Dongsheng Wu / Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
Yonghong Gu / Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
Zikai Lin / Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
The unique terrain and complex atmospheric boundary layer (ABL) processes result in a distinctive spatiotemporal distribution of dust in the Tarim Basin (TB); however, this distribution remains unclear under continuous clear-sky conditions. In this study, 382 cases were selected to investigate the spatiotemporal evolution of dust and its potential mechanisms based on MERRA-2 and ERA5 reanalysis datasets combined with MODIS satellite observations during the warm seasons from 2000 to 2023. The dust aerosol optical depth (DAOD) at the margin of the TB increased with time on July 24–27, 2016. The climatological characteristics showed a high DAOD in the northern, western, and southwestern regions and a relatively low DAOD in the central area. Nocturnal low-level jets dominated by northeasterly winds enhance the low-level westward airflow in weak anticyclonic systems, causing dust accumulation in the west and north of the basin. Vertical mixing within the ABL during the daytime increases dust loading in the residual layer, and these dust particles can ascend to high altitudes after breaking through the ABL by the vertical circulation. The dust loading at the lower level during the daytime was higher than that at night, whereas the opposite was true for the upper level. The downward airflow in the northwest slope of the Tibetan plateau weakens at night, leading to dust being uplifted to higher altitudes and transported outside the TB by the westerlies. These results enhance our understanding of dust distribution and related mechanisms in TB and support the development and utilization of climatic resources in this region.
重要日期

  • 会议日期

    01月14日

    2025

    至

    01月17日

    2025

  • 09月27日 2024

    初稿截稿日期

  • 12月14日 2024

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
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