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The Effects of Local Pollution and Transport Dust on Aerosol Properties in Typical Arid Regions of Central Asia during DAO-K Measurement

1
State Environmental Protection Key Laboratory of Satellite Remote Sensing, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China
2
Laboratoire d’Optique Atmosphérique (LOA), UMR8518 CNRS, Université de Lille, 59655 Villeneuve D’ASCQ, France
*
Authors to whom correspondence should be addressed.
Academic Editors: Thomas Gill, Tania Martellini and Kei Sato
Atmosphere 2022, 13(5), 729; https://doi.org/10.3390/atmos13050729
Received: 26 February 2022 / Revised: 23 April 2022 / Accepted: 28 April 2022 / Published: 2 May 2022
(This article belongs to the Special Issue Frontiers in Atmospheric Remote Sensing and Modelling)
Dust aerosol has an impact on both the regional radiation balance and the global radiative forcing estimation. The Taklimakan Desert is the focus of the present research on the optical and micro-physical characteristics of the dust aerosol characteristics in Central Asia. However, our knowledge is still limited regarding this typical arid region. The DAO-K (Dust Aerosol Observation-Kashgar) campaign in April 2019 presented a great opportunity to understand further the effects of local pollution and transported dust on the optical and physical characteristics of the background aerosol in Kashgar. In the present study, the consistency of the simultaneous observations is tested, based on the optical closure method. Three periods dominated by the regional background dust (RBD), local polluted dust (LPD), and Taklimakan transported dust (TTD), are identified through the backward trajectories, combined with the dust scores from AIRS (Atmospheric Infrared Sounder). The variations of the optical and micro-physical properties of dust aerosols are then studied, while a direct comparison of the total column and near surface is conducted. Generally, the mineral dust is supposed to be primarily composed of silicate minerals, which are mostly very weakly absorbing in the visible spectrum. Although there is very clean air (with PM2.5 of 21 μg/m3), a strong absorption (with an SSA of 0.77, AAE of 1.62) is still observed during the period dominated by the regional background dust aerosol. The near-surface observations show that there is PM2.5 pollution of ~98 μg/m3, with strong absorption in the Kashgar site during the whole observation. Local pollution can obviously enhance the absorption (with an SSA of 0.72, AAE of 1.58) of dust aerosol at the visible spectrum. This is caused by the increase in submicron fine particles (such as soot) with effective radii of 0.14 μm, 0.17 μm, and 0.34 μm. The transported Taklimakan dust aerosol has a relatively stable composition and strong scattering characteristics (with an SSA of 0.86, AAE of ~2.0). In comparison to the total column aerosol, the near-surface aerosol has the smaller size and the stronger absorption. Moreover, there is a very strong scattering of the total column aerosol. Even the local emission with the strong absorption has a fairly minor effect on the total column SSA. The comparison also shows that the peak radii of the total column PVSD is nearly twice as high as that of the near-surface PVSD. This work contributes to building a relationship between the remote sensing (total column) observations and the near-surface aerosol properties, and has the potential to improve the accuracy of the radiative forcing estimation in Kashgar. View Full-Text
Keywords: local polluted dust; Taklimakan transported dust; SSA; particle volume size distribution; AAE; complex refractive index local polluted dust; Taklimakan transported dust; SSA; particle volume size distribution; AAE; complex refractive index
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MDPI and ACS Style

Wei, Y.; Li, Z.; Zhang, Y.; Li, K.; Chen, J.; Peng, Z.; Hu, Q.; Goloub, P.; Ou, Y. The Effects of Local Pollution and Transport Dust on Aerosol Properties in Typical Arid Regions of Central Asia during DAO-K Measurement. Atmosphere 2022, 13, 729. https://doi.org/10.3390/atmos13050729

AMA Style

Wei Y, Li Z, Zhang Y, Li K, Chen J, Peng Z, Hu Q, Goloub P, Ou Y. The Effects of Local Pollution and Transport Dust on Aerosol Properties in Typical Arid Regions of Central Asia during DAO-K Measurement. Atmosphere. 2022; 13(5):729. https://doi.org/10.3390/atmos13050729

Chicago/Turabian Style

Wei, Yuanyuan, Zhengqiang Li, Ying Zhang, Kaitao Li, Jie Chen, Zongren Peng, Qiaoyun Hu, Philippe Goloub, and Yang Ou. 2022. "The Effects of Local Pollution and Transport Dust on Aerosol Properties in Typical Arid Regions of Central Asia during DAO-K Measurement" Atmosphere 13, no. 5: 729. https://doi.org/10.3390/atmos13050729

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