Abstract View
Stationary and Mobile Measurements of NO2 Vertical Column Density at an Agricultural Site
TAEWOONG GONG, Joonwoo Kim, Haebum Lee, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 640
Working Group: Remote and Regional Atmospheric Aerosol
Abstract
Nitrogen dioxide (NO2) plays a role in generating catalytic ozone through a photochemical reaction in the atmosphere. High concentration of NO2 can cause problems in the human respiratory system and vegetation. The NO2 is known to be mainly emitted from automobiles, and can also be generated through agricultural and livestock activities (Melynda et al., 2016). At an agricultural site near swine and chicken farms, the NO2 slant column densities (SCDs) and the vertical column densities (VCDs) were determined by using the Multi Axis Differential Optical Absorption Spectroscopy (MAX-DOAS). The stationary measurement was performed near the swine and chicken farms, and mobile measurement was conducted to determine the spatial variation of NO2 VCD along the route near the site in Gimje, South Korea (35.83°N, 126.98°E) during June-July of 2020 (summer) and January-February of 2021 (winter). For determination of the VCDs of NO2, the NO2 air mass factor was retrieved by a geometric approximation. The NO2 VCDs from 2°, 4°, 8°, 15° and 30° elevation angles were retrieved from stationary measurement in summer, 20° and 45° elevation angles were retrieved from mobile measurement in summer, and 0°, 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 10°, 15°, 20° and 30° elevation angles were retrieved from stationary measurement in winter. Seasonal and spatial variations of NO2 VCD around swine and chicken farms will be presented. Also, the relations of the NO2 VCD to NO2 concentration at ground level and chemical characteristics of fine particles will be discussed.