A23A-0260
Ozone Enhancement in the Lower Troposphere over Central and Eastern China as Observed from the space

Tuesday, 15 December 2015
Poster Hall (Moscone South)
Sachiko Hayashida1, Akiko Ono2, Satoko Kayaba2, Mizuo Kajino3, Makoto Deushi3, Takashi Maki3, Tsuyoshi Thomas Sekiyama4, Kazuyo Yamaji5 and Xiong Liu6, (1)Nara Women's University, Nara, Japan, (2)Faculty Science, Faculty of Science, Nara Women's University, Nara, Japan, (3)Meteorological Research Institute, Ibaraki, Japan, (4)Meteorological Res Inst, Tsukuba Ibaraki, Japan, (5)KOBE UNIVERSITY, Graduate School of Maritime Sciences, Kobe, Japan, (6)Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States
Abstract:
The recent roducts of the Ozone Monitoring Instrument (OMI) retrieved by Liu et al. (2010) revealed spatial and temporal variations in ozone distributions in multiple tropospheric layers. We compared the OMI-derived ozone over Beijing with the airborne measurements conducted by the Measurement of Ozone and Water Vapor by Airbus In-Service Aircraft (MOZAIC) program. The reliability of the OMI ozone retrievals was verified at the lower troposphere under enhanced ozone conditions (Hayashida et al. 2015).

Ozone enhancement was clearly observed over Central and Eastern China (CEC), with Shandong Province as its center and most notably in June in any given year. The seasonality of the ozone enhancement was similar throughout the nine-year OMI measurement period of 2005 to 2013.

As introduced by Hayashida et al. (2015), we have defined ΔO3 as the difference between the retrieved ozone and a priori value. To identify the area of significant ozone enhancement in further detail, the areas whose ΔO3 show similar seasonal variation were grouped into a cluster using the statistical tool R. As a result, the area covering the provinces of Shandong, Hebei, and Shanxi presents a clear seasonal variation, with the maximum in June.

The time series of ΔO3 at around 115–125°E along 36°N indicate clear seasonal variation with significant enhancement in June or July every year. At the western locations (<110°E), there is only a slight ozone enhancement in summer. In the east of the CEC, the amplitude of ozone enhancement in summer diminishes toward the east, as observed at 130°E, suggesting an outflow of ozone plumes from China.

The lower tropospheric ozone distribution maps retrieved using OMI products are generally consistent with the results from the model simulations by MRI-CCM2 of the Meteorological Research Institute Japan as far as emissions due to industrial activities and automobile exhaust are concerned, although there are still a few differences in the ozone mixing ratios and their distribution. We have also carried out a comparison among the model simulations, including the emission inventory data developed by Yamaji et al. (2010) and other anthropogenic emissions, in order to investigate the effect of Open Crop Residue Burning (OCRB) as pointed out by Kanaya et al. (2013).

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