应用查表法模拟区域对流层O_3、NO_x分布和演化的研究

A Study of Using Look-up Table Method to Simulate Tropospheric Ozone and NO_x Evolution and Their Distributions

应用ＳＴＥＭ－Ⅱ气相光化学模式探讨了影响对流层Ｏ_３、ＮＯ_ｘ气相光化学转化率的各物理、化学因子。表明在我国多数地区光化学污染物特征（ＮＭＨＣ／ＮＯ_ｘ较高）下，光辐射强度、温度、初始Ｏ_３浓度和ＮＯ_ｘ浓度是影响Ｏ_３、ＮＯ_ｘ气相光化学转化率的主要因子。将以上因子分档组合，计算并建立了各种情况下Ｏ_３、ＮＯ_ｘ气相光化学转化率的查算表，并将之用于模拟区域Ｏ_３、ＮＯ_ｘ的演化和分布。结果表明，与光化学模式直接耦合计算法相比，该方法既能显著缩短计算时间，又能基本反映大气化学反应的非线性过程，并与直接耦合法符合得较好。

Using STEM-II gas phase photochemistry model, the main physical/ chemical factors which influence the photochemical transformation of tropospheric O3 and NOx have been discussed. The results show that strength of solar radiation flux, temperature, the concentration of NOx and the concentration of initial O3 are important factors considering the features of photochemistry contamination in China. Then, the look-up tables of O3 and NOx are respectively constructed by calculating the rate of photochemical transformation of O3 and NOx in various conditions according to these factors. These tables are coupled with the dynamic frame of the STEM-II model to simulate the evolution and distribution of the tropospheric O3 and NOx over East Asia. The results by this method are in pretty good agreement with those directly by using the original STEM-II gas phase photochemistry model, and this model can highly save computation time and keep the basic features of strong non-linear processes in atmospheric chemical reactions.