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| Comparison of Methods for Dry Deposition Velocity and Flux Estimation of Atmospheric Pollutants—A Case Study in Xianlin District, Nanjing |
| Received:December 08, 2018 Revised:June 25, 2019 |
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| DOI：10.7643/ issn.1672-9242.2019.06.020 |
| KeyWord:dry deposition flux dry deposition velocity inferential method gradient method |
| Author | Institution |
| ZHAO Xiong-fei |
School of Atmospheric Sciences, Nanjing University, Nanjing , China |
| WANG Ti-jian |
School of Atmospheric Sciences, Nanjing University, Nanjing , China |
| HUANG Man-tang |
School of Atmospheric Sciences, Nanjing University, Nanjing , China |
| YANG-Fan |
School of Atmospheric Sciences, Nanjing University, Nanjing , China |
| YANG Dan-dan |
School of Atmospheric Sciences, Nanjing University, Nanjing , China |
| JIN Long-shan |
School of Atmospheric Sciences, Nanjing University, Nanjing , China |
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| Abstract: |
| Objective To compare the difference of dry deposition velocity and flux of atmospheric pollutants estimated with different methods. Methods Based on the 75 m observation tower, six pollutants concentration in the atmosphere, such as sulfur dioxide (SO2), nitrogen monoxide (NO), nitrogen dioxide (NO2), ozone (O3), carbon monoxide (CO), and fine particulate matter (PM2.5) and meteorological elements were observed at the Xianlin Campus of Nanjing University during 13 months (September 2016 to September 2017). The dry deposition velocities of atmospheric pollutants were calculated by the three-layer resistance model and the dry deposition fluxes ware calculated by the inferential method and the gradient method; and then the two methods were compared. Results The average dry deposition velocities of SO2, NO, NO2, O3, CO and PM2.5 were 0.270, 0.019, 0.089, 0.449, 0.038 and 0.147 cm/s respectively. The dry deposition velocity had obvious daily variation characteristics. Generally, the variation in the daytime was greater than that in the nighttime, and the maximum value appeared in the afternoon. During the whole observation period, the dry deposition fluxes of SO2, NO, NO2, O3, CO and PM2.5 calculated by the inferential method were 0.034 0.008, 0.037, 0.263, 0.354, 0.049 μg/(m2•s) respectively, and the dry deposition fluxes obtained by the gradient method were 0.04, 0.00193, 0.035, 0.278, 0.192, 63 μg/(m2•s) respectively. Conclusions For NO, O3, PM2.5, the dry deposition flux calculated by inferential method and gradient method has good consistency. Estimation of the dry deposition flux by the gradient method largely depends on the accuracy of the concentration gradient measurement. Estimation of the dry deposition by the concentration method more depends on the calculation accuracy of the dry deposition rate. |
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