春季境外生物质燃烧对东亚臭氧污染的影响

目的定量研究境外生物质燃烧对春季东亚地表臭氧浓度的影响。方法利用敏感性分析法与线性加权法,使用全球化学传输模式GEOS-Chem模拟春季全球不同地区生物质燃烧排放对东亚地表臭氧的贡献。结果春季全球生物质燃烧对东亚地表臭氧贡献在1×10~(-9)～5×10~(-9)(按体积计算)之间,其中75%是境外生物质燃烧的贡献。境外生物质燃烧对中国南部的影响比东亚其他区域更大,可达3×10~(-9)。在所有境外源区中,生物质燃烧对东亚地表臭氧影响最大的源区是非洲与东南亚。前者是中国东北部、中国北部、朝韩及日本地区的主要境外贡献区域。后者对中国南部的相对贡献最大。结论春季境外生物质燃烧对东亚地表臭氧的贡献具有一定的空间差异。境外生物质燃烧对东亚空气质量有重要影响。东亚地表臭氧污染治理需要世界各国及区域之间的良好合作。

Influences of Biomass Burning Emissions in Foreign Regions on Springtime Surface Ozone over East Asia

Objective To study the impact of biomass burning emissions from foreign regions on surface ozone over East Asia in the spring. Methods Combining a sensitivity test and the linear weighting method, we simulated the individual contribution of biomass burning from different foreign regions in the world to surface ozone in East Asia with a global chemical transport model, GEOS-Chem. Results Biomass burning in the Spring of the world contributed 1×10-9~5×10-9 to surface ozone in East Asia, in which, fire-induced ozone from foreign regions accounted for 75%. Fire-induced ozone from foreign regions contributed more to South China than to other regions in East Asia, reaching approximately 3×10-9. Among all the foreign regions, Southeast Asia and Africa were the largest contributors. Fire-induced ozone from Southeast Asia mainly influenced surface ozone in South China, while Africa imposed the largest foreign influences over Northeast China, North China, Korea, and Japan. The later had relatively large influences on South China. Conclusion The influence of biomass burning in foreign regions to springtime surface ozone in East Asia varies largely in space. Biomass burning in foreign regions can impact air quality in East Asia. Regional and international collaborations are needed for ozone pollution control in East Asia.