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http://dx.doi.org/10.7780/kjrs.2020.36.6.3.4

The Washing Effect of Precipitation on PM10 in the Atmosphere and Rainwater Quality Based on Rainfall Intensity  

Park, Hyemin (Division of Earth Environmental System Sciences, Pukyong National University)
Byun, Myounghwa (Department of Environmental Atmospheric Sciences, Pukyong National University)
Kim, Taeyong (Division of Earth Environmental System Sciences, Pukyong National University)
Kim, Jae-Jin (Department of Environmental Atmospheric Sciences, Pukyong National University)
Ryu, Jong-Sik (Department of Earth and Environmental Sciences, Pukyong National University)
Yang, Minjune (Department of Earth and Environmental Sciences, Pukyong National University)
Choi, Wonsik (Department of Environmental Atmospheric Sciences, Pukyong National University)
Publication Information
Korean Journal of Remote Sensing / v.36, no.6_3, 2020 , pp. 1669-1679 More about this Journal
Abstract
This study examines the washing effect of precipitation on particulate matter (PM) and the rainwater quality (pH, electrical conductivity (EC), water-soluble ions concentration). Of six rain events in total, rainwater samples were continuously collected every 50 mL from the beginning of the precipitation using rainwater collecting devices at Pukyong National University, Busan, South Korea, from March 2020 to July 2020. The collected rainwater samples were analyzed for pH, EC, and water-soluble ions (cations: Na+, Mg2+, K+, Ca2+, NH4+, and anions: Cl-, NO3-, SO42-). The concentrations of particulate matter were continuously measured during precipitation events with a custom-built PM sensor node. For initial rainwater samples, the average pH and EC were approximately 4.3 and 81.9 μS/cm, and the major ionic components consisted of NO3- (5.4 mg/L), Ca2+ (4.2 mg/L), Cl- (4.1 mg/L). In all rainfall events, rainwater pH gradually increased with rainfall duration, whereas EC gradually decreased due to the washing effect. When the rainfall intensities were relatively weak (<5 mm/h), PM10 reduction efficiencies were less than 40%. When the rainfall intensities were enhanced to more than 7.5 mm/h, the reduction efficiencies reached more than 60%. For heavy rainfall events, the acidity and EC, as well as ions concentrations of initial rainwater samples, were higher than those in later samples. This appears to be related to the washing effect of precipitation on PM10 in the atmosphere.
Keywords
particulate matter; washing effect; rainwater quality; rainfall intensity; PM reduction efficiency;
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Times Cited By KSCI : 8  (Citation Analysis)
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