Wang Qin'geng, Han Zhiwei, Wang Tijian, Zhang Renjian
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China.
Sci Total Environ. 2008 May 20;395(1):41-9. doi: 10.1016/j.scitotenv.2008.01.059. Epub 2008 Mar 10.
This study is intended to understand and quantify the impacts of biogenic emissions of volatile organic compounds (VOC) and nitrogen oxides (NO(x)) on the formation of tropospheric ozone during summertime in eastern China. The model system consists of the non-hydrostatic mesoscale meteorological model (MM5) and a tropospheric chemical and transport model (TCTM) with the updated carbon-bond chemical reaction mechanism (CBM-IV). The spatial resolution of the system domain is 30 km x 30 km. The impacts of biogenic emissions are investigated by performing simulations (36 h) with and without biogenic emissions, while anthropogenic emissions are constant. The results indicate that biogenic emissions have remarkable impacts on surface ozone in eastern China. In big cities and their surrounding areas, surface ozone formation tends to be VOC-limited. The increase in ozone concentration by biogenic VOC is generally 5 ppbv or less, but could be more than 10 ppbv or even 30 ppbv in some local places. The impacts of biogenic NO(x) are different or even contrary in different regions, depending on the relative availability of NO(x) and VOC. The surface ozone concentrations reduced or increased by the biogenic NO(x) could be as much as 10 ppbv or 20 ppbv, respectively. The impacts of biogenic emissions on ozone aloft are generally restricted to the boundary layer and generally more obvious during the daytime than during the nighttime. This study is useful for understanding the role of biogenic emissions and for planning strategies for surface ozone abatement in eastern China. Due to limitations of the emission inventories used and the highly non-linear nature of zone formation, however, some uncertainties remain in the results.
本研究旨在了解并量化挥发性有机化合物（VOC）和氮氧化物（NO(x)）的生物源排放对中国东部夏季对流层臭氧形成的影响。该模型系统由非静力中尺度气象模型（MM5）和采用更新的碳键化学反应机制（CBM-IV）的对流层化学与传输模型（TCTM）组成。系统域的空间分辨率为30 km×30 km。通过在人为排放恒定的情况下进行有无生物源排放的模拟（36小时），研究生物源排放的影响。结果表明，生物源排放在中国东部对地表臭氧有显著影响。在大城市及其周边地区，地表臭氧形成往往受VOC限制。生物源VOC导致的臭氧浓度增加一般在5 ppbv或更低，但在某些局部地区可能超过10 ppbv甚至30 ppbv。生物源NO(x)的影响在不同地区有所不同甚至相反，这取决于NO(x)和VOC的相对可利用性。生物源NO(x)导致的地表臭氧浓度分别降低或增加可达10 ppbv或20 ppbv。生物源排放对高空臭氧的影响一般局限于边界层，且白天通常比夜间更明显。本研究有助于理解生物源排放的作用以及规划中国东部地表臭氧减排策略。然而，由于所用排放清单的局限性以及臭氧形成的高度非线性性质，结果仍存在一些不确定性。
