Japan Geoscience Union Meeting 2023

Presentation information

[J] Online Poster

A (Atmospheric and Hydrospheric Sciences ) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS07] Atmospheric Chemistry

Tue. May 23, 2023 9:00 AM - 10:30 AM Online Poster Zoom Room (3) (Online Poster)

convener:Yosuke Sakamoto(Kyoto University Graduate School of Global Environmental Studies), Risa Uchida(Japan Automobile Research Institute), Shigeyuki Ishidoya(Advanced Industrial Science and Technology), Yoko Iwamoto(Graduate School of Integrated Sciences for Life, Hiroshima University)

On-site poster schedule(2023/5/22 17:15-18:45)

9:00 AM - 10:30 AM

[AAS07-P12] Temporal variations in tropospheric NO2 vertical column densities from Pandora instrument at Yokosuka, Japan

*Giyeol Lee1, Yongjoo Choi1, Yugo Kanaya2, Yoshiaki Endo2 (1.Department of Environmental Science, Hankuk University of Foreign Studies, 17035, South Korea, 2.Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, 236-0001, Japan)

Keywords:Pandora, NO2 TropoVCD , Diurnal variation, Monthly variation

Nitrogen dioxide (NO2) is a gaseous air pollutant that plays a role in the formation reaction of tropospheric ozone. Though orbital satellites are useful to monitor and identify major emission sources of NO2, its low temporal resolution makes it difficult to capture the temporal variation of NO2. Therefore, the ground-based Pandora can be an alternative to investigate the high temporal variability of NO2 at the fixed location by compensating for the satellite observation. In this study, we investigated NO2 tropospheric vertical column density (TropoVCD) from Pandora (146). Pandora is installed at Yokosuka (35.32°N, 139.65°E), Japan, which can represent the characteristic of an urban area since June 2021. The monthly mean variation of NO2 TropoVCD showed the highest in winter and lowest in summer due to the reduced solar irradiance in winter (increased lifetime of NO2). The seasonally-averaged diurnal variation generally showed an increasing pattern in the morning and a decreasing trend in the afternoon likely due to the viewing direction with less pollution. However, the peak times and magnitude of diurnal variations in NO2 TropoVCD varied depending on the season (early peak with small variability in the warm season and late peak with large variability in the cold season). A more detailed investigation will be conducted including backward trajectory analysis to identify the main source of NO2 TropoVCD in Tokyo Metropolitan Area.