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- Title
Lidar detection of high concentrations of ozone and aerosol transported from Northeast Asia over Saga, Japan.
- Authors
Osamu Uchino; Tetsu Sakai; Toshiharu Izumi; Tomohiro Nagai; Isamu Morino; Akihiro Yamazaki; Makoto Deushi; Keiya Yumimoto; Takashi Maki; Tanaka, Taichu Y.; Taiga Akaho; Hiroshi Okumura; Kohei Arai; Takahiro Nakatsuru; Tsuneo Matsunaga; Tatsuya Yokota
- Abstract
To validate products of the Greenhouse gases Observing SATellite (GOSAT), we observed vertical profiles of aerosols, thin cirrus clouds, and tropospheric ozone with a mobile lidar system that consisted of a two-wavelength (532 and 1064 nm) polarization lidar and a tropospheric ozone Differential Absorption Lidar (DIAL). We used these lidars to make continuous measurements over Saga (33.24° N, 130.29° E) during 20-31 March 2015. High ozone and high aerosol concentrations were observed almost simultaneously in the altitude range 0.5-1.5 km from 03:00 to 20:00 Japan Standard Time on 22 March 2015. The maximum ozone volume mixing ratio was ~ 110 ppbv. The maxima of the aerosol extinction coefficient and optical depth at 532 nm were 1.2 km-1 and 2.1, respectively. Backward trajectory analysis indicated that an air mass with high ozone and aerosol concentrations could have been transported from Northeast Asia. Based on the lidar data and the ground-based in-situ measurements at Saga, this air mass could have been transported to the surface by vertical mixing when the planetary boundary layer developed in the daytime. This plume, which contained high ozone and aerosol pollutant concentrations, impacted surface air quality substantially. After some modifications of its physical and chemical parameters, the Meteorological Research Institute Chemistry-Climate Model, version 2 (MRI-CCM2) approximately reproduced the high-ozone volume-mixing ratio. The Model of Aerosol Species IN the Global AtmospheRe (MASINGAR) mk-2 successfully predicted high aerosol concentrations, but the predicted peak aerosol optical thickness was about one-third of the observed value.
- Subjects
LIDAR; ATMOSPHERIC aerosols; GREENHOUSE gases &; the environment; METEOROLOGICAL observations; CIRRUS clouds; TROPOSPHERIC ozone
- Publication
Atmospheric Chemistry & Physics Discussions, 2016, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2016-520