Vegetation-related dry deposition of global PM2.5 from satellite observations

Vegetation plays an important role in the dry deposition of particles with significant spatial variability, but the magnitude remains unclear at the global scale. With the aid of satellite products, this study estimated the vegetation-related dry deposition of fine particulate matter (PM 2.5 ). Meth...

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Bibliographic Details
Published in:Journal of geographical sciences 2022-04, Vol.32 (4), p.589-604
Main Authors: Feng, Huihui, Ding, Ying, Zou, Bin, Cohen, Jason Blake, Ye, Shuchao, Yang, Zhuolin, Qin, Kai, Liu, Lei, Gu, Xiaodong
Format: Article
Language:English
Subjects:
Air pollution
Air quality
Dry deposition
Earth and Environmental Science
Geographical Information Systems/Cartography
Geography
Land management
Land pollution
Nature Conservation
Outdoor air quality
Particulate matter
Physical Geography
Pollution sources
Remote Sensing/Photogrammetry
Vegetation
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Summary:Vegetation plays an important role in the dry deposition of particles with significant spatial variability, but the magnitude remains unclear at the global scale. With the aid of satellite products, this study estimated the vegetation-related dry deposition of fine particulate matter (PM 2.5 ). Methodologically, dry deposition was first calculated using an empirical algorithm. Then, deposition on the leaf surface was estimated to evaluate the influence of vegetation. Our results showed that the mean deposition velocity ( V d ) of global PM 2.5 was 0.91×10 −3 µg·m −2 ·s −1 , with high velocities observed in sparsely vegetated regions because of the high friction velocity. Under the combined effect of the PM 2.5 mass concentration and deposition velocity, the global mean dry deposition reached 0.47 g·m −2 ·yr −1 . Global vegetation absorbed 0.26 g·m −2 ·yr −1 from PM 2.5 pollution sources, contributing 54.98% of the total dry deposition. Spatially, vegetation-related dry deposition was high in the Amazon, Central Africa and East China due to dense vegetation coverage or serious pollution. Temporally, the increasing trends were mainly in Central Africa and India because of worsening air pollution. The results of this study helped to clarify the impact of vegetation on air pollution, which supported related land management and planning for air quality improvement.
ISSN:1009-637X
1861-9568
DOI:10.1007/s11442-022-1962-0