Analysis of the seasonal variation of ozone in the boundary layer in East Asia using the Community Multi-scale Air Quality model: What controls surface ozone levels over Japan?

作者：Yamaji K^*; Ohara T; Uno I; Tanimoto H; Kurokawa J; Akimoto H

来源：Atmospheric Environment, 2006, 40(10): 1856-1868.

DOI：10.1016/j.atmosenv.2005.10.067

• ozone
• seasonal variation
• East Asia
• regional emissions
• chemical transport model

Ozone (O-3) concentrations in East Asia were simulated using the Community Multi-scale Air Quality model and their reproducibility was confirmed by comparing with observation data at Japanese monitoring sites. The model can reproduce the seasonal variation of surface O-3 over Japan. In particular, for the southern parts of Japan, simulated surface O-3 concentrations are strongly correlated with observations. Surface O-3 distribution over East Asia varies dynamically from season to season according to the meteorological condition. In May and June, 2-month average O-3 concentrations in the boundary layer are highest, 55-70 ppbv over East China and Japan at 35-40 degrees N. We estimated the seasonal variation of the contribution of chemically produced O-3 by east Asian regional emissions. In the summertime, the contribution of the regional Asian emissions to O-3 concentrations is around 40-70% over most of China, and the highest is 60-70% ( < 35 ppbv) at the mouth area of Yantze River. This suggests that O-3 concentrations over East Asia are strongly influenced by the chemical production by regional emissions during summer season. However, the inflow from outside of this model domain also contributes substantial O-3 concentration over East Asia and its contribution is predominant in winter and early spring. The seasonal change of O-3 concentrations over Japan is characterized by two peaks in spring and autumn and summer minimum. The spring peak event in 2002 consists of split peaks: the first peak in Mar-Apr is mainly influenced by the inflow from outside of this model domain, the second spring peak between May and June is mainly influenced by chemically produced O-3 by regional emissions. During the summer season, O-3 concentrations are the lowest over year because of the weak Asian outflow and northward penetration of the marine air mass.

• 出版日期2006-3