Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

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

[A-AS04] Atmospheric Chemistry

Thu. May 30, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Tomoki Nakayama(Graduate School of Fisheries and Environmental Sciences, Nagasaki University), Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Sakae Toyoda(Department of Chemical Science and Engineering, Tokyo Institute of Technology), Nawo Eguchi(Kyushu University)

[AAS04-P21] Spatiotemporal variations of nitrogen dioxide (NO2) over Fukuoka , observed by multiple MAX-DOAS instruments and 3-D coherent Doppler lidar

*Hironobu Ueki1, Hisahiro Takashima1, Martina M. Friedrich2 (1.Fukuoka university, 2.Belgian Institute for Space Aeronomy (BIRA-IASB), Belgium)


To understand spatiotemporal variations and transport/mixing processes in nitrogen dioxide (NO2) over Fukuoka, an urban area in Japan, continuous NO2 profile observations with a high temporal resolution of four minutes by MAX-DOAS (Multi Axis Differential Optical Absorption Spectroscopy) at three sites in Fukuoka have been conducted from October 2018 to January 2019. Two sites (Yakuin (33.580°N, 130.396°E) and Sohara (33.580°N, 130356°E)) are located near the city center and pointing towards the north(towards the sea), and one site (Fukuoka University (33.550°N, 130.364°E)) is located outside of the city center pointing towards the city center.

In the case of 29 November 2018, an air mass with a high NO2 concentration was observed near the ground in the morning (until 10:30 am) and later, around 10:30 to 11:30 am, an increased concentration of NO2 gradually appeared at a higher altitude over the city center. This increased NO2 concentration disappeared around 13:30-14:00 pm. From the simultaneous three-dimensional (3-D) wind observations by 3-D coherent Doppler lidar installed at Fukuoka University, it is suggested that the air mass with high NO2 concentration was transported upward from the ground by vertical convection, and after that, a clean air-mass was advected from sea by sea-breeze. In this presentation, we will show several results observed by the multipoint MAX-DOAS and 3-D wind observations, focusing on the 3-D transport over Fukuoka using the high NO2 air mass as a tracer.