Modeling tropospheric ozone formation over East China in springtime

Modeling tropospheric ozone formation over East China in springtime
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模拟中国东部春季对流层臭氧的形成

DOI:
10.1007/s10874-012-9244-3
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发表时间:
2012-12
影响因子:
2
通讯作者:
Wang, Xiaoyuan
Wang, Xiaoyuan
中科院分区:
地球科学4区
文献类型:
--
作者:
Liu, Qian;Wang, Tijian;Zhuang, Bingliang;Wang, Xiaoyuan

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利用WRF/Chem模式对2008年4月华东地区春季O3的形成进行了研究。在WRF/Chem中增加了一个简单的过程分析方案,可以计算光化学和物理过程对O3形成的贡献。WRF/Chem计算了两个嵌套区域系统的逐时三维O3混合比、光化学O3产生率(CPR)和物理过程贡献率(PCR),内区域以中国东部为中心。模型评价结果表明,模拟结果与观测值吻合较好。在地面上,高O3混合比(> 45 ppbv)位于福建和江西省。长江三角洲和北方苏北地区O3浓度较低(<30 ppbv)。CPR和PCR在华东地区的分布格局表明,江西和福建地区的高O3混合比是由本地光化学生成和区域输送共同作用的结果,而长江三角洲地区的O3浓度则是由周边地区的输送和扩散共同作用的结果。此外,生物和人为排放的贡献,以及从域的上游地区的区域运输进行了讨论。平均而言,生物和人为排放占白天平均O3混合比在华东地区分别为2.6和4.5 ppbv。
In this study, we investigate the springtime O3formation over East China (April 2008) using the Weather Research and Forecasting Model with Chemistry (WRF/Chem). A simple process analysis scheme is added to WRF/Chem, which could calculate the contributions of photochemical and physical processes to O3formation. WRF/Chem calculates the hourly 3-D O3mixing ratios, photochemical O3production rates (CPR) and physical processes contribution rates (PCR) on a two nested domain system, with inner domain focusing on East China. Model evaluation shows that the modeled results agree relatively well with the observations. On the ground level, the high O3mixing ratios (>45 ppbv) are located over Fujian and Jiangxi provinces. The O3levels over the Yangtze River Delta (YRD) and northern Jiangsu are low (<30 ppbv). The distribution patterns of CPR and PCR over East China reveal that the high O3mixing ratios over Jiangxi and Fujian are caused by both local photochemical generation and regional transport, while the O3concentrations over the YRD region are transported and diffused from surrounding areas. In addition, the contributions of biogenic and anthropogenic emissions as well as the regional transport from domain’s upstream regions are discussed. On average, the biogenic and anthropogenic emissions account for 2.6 and 4.5 ppbv of daytime mean O3mixing ratios in East China, respectively.
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