摘要:NO2的光解速率j(NO2)是对流层化学研究中的一个重要的参数，它是对流层臭氧（O3）和OH自由基的形成关键影响因子之一。本文利用香河站2017年11月至2018年1月的观测资料对NO2的光解速率j(NO2)、太阳辐射的变化特征，及光解速率与分波段辐射相关性进行分析，在此基础上建立了一套适合于构建香河地区j(NO2)的参数化方案。结果表明，香河地区的j(NO2)与太阳辐射的变化趋势基本一致，日变化均呈正午高、早晚低的单峰型。香河地区冬季j(NO2)的变化范围是0.00046～0.0044 s-1，平均值为0.0029 s-1。j(NO2)与晴空指数（KS）和定义的紫外辐射晴空指数（KUV）存在很好的相关性，因此，利用j(NO2)与大气质量数和晴空指数的相互依赖关系，基于KUV构建了适合于香河地区j(NO2) 的估算方程。由于总辐射是气象站的常规观测要素，晴空指数KS更容易获取，继而建立了通过KS参数化计算j(NO2)的估算方程。利用KUV和KS建立的j(NO2)估算方程的瞬时估算值与观测值的平均相对误差分别为6.5%和13.9%，均方根误差分别为0.00029和0.00051。
关键词:光解速率/
辐照度/
香河/
估算公式
Abstract:The NO2 photolysis frequency j(NO2) is an important parameter in tropospheric chemistry. It is one of the key factors affecting the formation of ozone and OH radicals in the troposphere. The variations of j(NO2) and solar radiation and the correlation between photolysis rate and sub-band solar radiation were analyzed using the observational data in Xianghe from November 2017 to January 2018. On this basis, a parameterized scheme suitable for reconstructing j(NO2) in the Xianghe area was constructed. The results indicate that the variation trends of j(NO2) and solar radiation in Xianghe are basically the same, and the diurnal variations are all unimodal with high noon and small morning and evening. The variation range of j(NO2) in winter is 0.00046-0.0044 s-1, with a mean of 0.0029 s-1. Since j(NO2) correlates well with the clear sky index (KS) and transmittance of ultraviolet radiation (KUV), an experimental estimating equation based on KUV was established using the correlation between j(NO2), air mass number, and clear air index. Considering the clear sky index KS is more easily obtained and global radiation is a conventional observation of meteorological stations, an experimental estimating equation was established based on KS. The instantaneous value of j(NO2) can be estimated by the equations established using KUV and Ks, and the mean absolute percentage errors between the instantaneous values obtained by the two equations and the observed value are 6.5% and 13.9%, and the root mean square errors are 0.00029 and 0.00051, respectively.
Key words:Photolysis frequency/
Irradiance/
Xianghe/
Estimation formula
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