title: Spatiotemporal Characteristics of Particulate Matter and Dry Deposition Flux in the Cuihu Wetland of Beijing.
abstract: In recent years, the rapid development of industrialization and urbanization has caused serious environmental pollution, especially particulate pollution. As the "Earth's kidneys," wetland plays a significant role in improving the environmental quality and adjusting the climate. To study how wetlands work in this aspect, from the early autumn of 2014 to 2015, we implemented a study to measure the PM concentration and chemical composition at three heights (1.5, 6, and 10 m) during different periods (dry, normal water, and wet periods) in the Cuihu wetland park in Beijing for analyzing the dry deposition flux and the effect of meteorological factors on the concentration. Results indicated that (1) the diurnal variations of the PM2.5 and PM10 concentrations at the three heights were similar in that the highest concentration occurred at night and the lowest occurred at noon, and the daytime concentration was lower than that at night; (2) the PM2.5 and PM10 concentrations also varied between different periods that wet period > normal water period > wet period, and the concentration at different heights during different periods varied. In general, the lowest concentration occurred at 10 m during the dry and normal water periods, and the highest concentration occurred at 1.5 m during the wet period. (3) SO42-, NO3-, and Cl- are the dominant constituents of PM2.5, accounting for 42.22, 12.6, and 21.56%, respectively; (4) the dry depositions of PM2.5 and PM10 at 10 m were higher than those at 6 m, and the deposition during the dry period was higher than those during the wet and normal water periods. In addition, the deposition during the night-time was higher than that during the daytime. Moreover, meteorological factors affected the deposition, the temperature and wind speed being negatively correlated with the deposition flux and the humidity being positively correlated. (5) The PM10 and PM2.5 concentrations were influenced by meteorological factors. The PM2.5 and PM10 concentrations were negatively correlated with temperature and wind speed but positively correlated with relative humidity.
authors.affiliation: College of Nature Conservation, Beijing Forestry University, Beijing, China.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Zhu
authors.affiliation: College of Nature Conservation, Beijing Forestry University, Beijing, China.
authors.forename: Jiakai
authors.initials: J
authors.lastname: Liu
authors.affiliation: College of Nature Conservation, Beijing Forestry University, Beijing, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Cong
authors.affiliation: College of Nature Conservation, Beijing Forestry University, Beijing, China.
authors.forename: Wenmei
authors.initials: W
authors.lastname: Ma
authors.affiliation: School of Natural resources, West Virginia University, Morgantown, West Virginia, United States of America.
authors.forename: Wu
authors.initials: W
authors.lastname: Ma
authors.affiliation: College of Nature Conservation, Beijing Forestry University, Beijing, China.
authors.forename: Zhenming
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000393:Air Pollutants; D000068476:Beijing; D002681:China; D004784:Environmental Monitoring; D004787:Environmental Pollution; D006801:Humans; D006813:Humidity; D008685:Meteorological Concepts; D052638:Particulate Matter; D013696:Temperature; D053833:Wetlands; D014919:Wind
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter