Spatial distributions of vertical eddy diffusivity (Kz)，dry deposition velocity(V), and concentrations of O3and NOxover East Asia are simulated using the surfacelayer similarity and the whole PBL similarity in the turbulence parameterization, after coupling the widely applied LLA (Lurmann Lloyd Atkinson) chemical mechanism in East Asia into the Regional Air Quality Eulerian Model (RAQM) and considering the temporal heterogeneity in rainwater in longterm modeling studies of air pollutants over a large domain. Simulations indicate that Kzvalues are significantly underestimated by the whole PBL similarity, with above 20% at 50 m and around 70% at 750 m high above the ground, respectively. Dry deposition velocities of O3 and NOx are underestimated at least 10% in the sea area on the east and south of Japan, while in the sea area on the east and west of Korea Peninsula the values are generally higher. Large deviations in Kzand dry deposition velocity between the two schemes lead to different results of O3 and NOx. Underestimation oKz values leads to large changes in NOx concentrations, with a maximum increase of 30% at 50 m high above the ground and approximately 5%-20% increases in mean NOxlevels in the whole PBL except the sea area on the northeast of Taiwan. However, the concentrations of O3 are dependent significantly on the dry deposition process. The surfacelayer similarity and the whole PBL similarity well depict the timing of O3and NOx peaks while the surfacelayer similarity follows observations in amplitude better than the whole PBL similarity. The surfacelayer similarity is a better choice than the whole PBL similarity and the first vertical model layer should be set within the surface constant flux layer even in longterm regional simulations of air pollutants.
屈玉,安俊岭,周慧,叶小峰.2009.全边界层选用相似理论对O3、NOx浓度及沉降的影响[J].气候与环境研究,14(4):363-372. Qu Yu, An Junling, Zhou Hui, Ye Xiaofeng.2009. Impacts of the PBL Similarity on Concentrations and Dry Deposition Velocities of O3 and NOx[J]. Climatic and Environmental Research (in Chinese],14(4):363-372.Copy