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