AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Spatial and Temporal Trends of Aerosol and Precipitation Chemistry at Four Sites in South Korea, 1997-2015
BEOMCHEOL SHIN, Jo Wan Cha, Sang-bum Ryoo, NIMS, KMA
Abstract Number: 262 Working Group: Carbonaceous Aerosols in the Atmosphere
Abstract Comparison between rainwater and aerosol components reveals some information about common sources of these components. Na$^+ and Mg$^(2+) are sea salt elements in both rain and aerosol. Mg$^(2+), Ca$^(2+), and Na$^+ are associated with crustal origin. Similarly the anthropogenic constituents SO$_(4)$^(2−), NH$_(4)$^+ and K$^+ indicate similar source of origin, namely, they were incorporated into cloud droplet and transported to other location. In this work, we investigate the annual profiles of rain/snow water accumulation, precipitation pH, and composition of precipitation and aerosol particles. Precipitation accumulation occurs mostly during the monsoon season (July-September). Rain and snow pH levels are usually between 4-6, with crustal-derived species playing a major role in acid neutralization. These species (Ca$^(2+), Mg$^(2+), K$^(+), Na$^(+)) exhibit their lowest concentrations during summer and their highest concentrations in the other seasons in both PM$_(2.5) and precipitation due mostly to dust. And how these species are best correlated with each other in rain and snow will also be discussed.
And the trends of sulfate, nitrate, and ammonium in precipitation can indicate changes in the mixture of gases and particles scavenged by precipitation, possibly reflecting changes in emissions, atmospheric chemical transformations, and weather patterns. We characterizes the spatial and temporal patterns of aerosol and precipitation composition at four sites across South Korea between 1997 and 2015 by Mann-Kendall statistical test. Analyses were performed on concentrations of ammonium, sulfate, nitrate, dissolved inorganic nitrogen (DIN, sum of nitrogen from nitrate and ammonium), and earth crustal cations (ECC, sum of calcium, magnesium, and potassium). And the most influential species towards rain and snow water pH will be presented.