Variation Characteristics and Estimation Method of NO2 Photolysis Rate in Xianghe during Winter
Author:
Affiliation:
1.School of Electronic Engineering, Chengdu University of Information Science and Technology, Chengdu610225;2.State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing100029;3.University of Chinese Academy of Sciences, Beijing100049;4.Shaanxi Provincial Meteorological Observatory, Xi'an710014;5.College of Atmospheric Science, Lanzhou University, Lanzhou730000;6.Key Laboratory of drought Climate Change and Disaster Reduction in Gansu Province, Lanzhou730000
Fund Project:
National Key Research and Development Program of China 2017YFC021003;the Strategic Priority Research Program of the Chinese Academy of Sciences XDA19020303Funded by National Key Research and Development Program of China (Grant 2017YFC021003), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDA19020303)
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.
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杜超杰,赵舒曼,刘慧,马翼宁,邹嘉南,邓小波,胡波.2020.香河地区冬季NO2光解速率的变化特征及其估算方法的建立[J].气候与环境研究,25(1):64-76. DU Chaojie, ZHAO Shuman, LIU Hui, MA Yining, ZOU Jianan, DENG Xiaobo, HU Bo.2020. Variation Characteristics and Estimation Method of NO2 Photolysis Rate in Xianghe during Winter[J]. Climatic and Environmental Research (in Chinese],25(1):64-76.