ZHU Zhipeng¹, ZHOU Limin^1,2, ZHENG Xiangmin¹

(1. Key Laboratory of Geographic Information Science, Ministry of Education, School of Geographical Sciences, East China Normal University, Shanghai, 200241, China;
2. Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, CAS, Beijing, 100029, China)

Abstract: The stratospheric ozone concentration at high latitudes has a great influence on biogeochemical processes at the polar surface. In recent years, the influence of energetic electron precipitation on atmospheric ozone and reactive nitrogen has become a new focus. Based on the coupled chemistry-climate model SOCOL3.0 and the parameterization schemes of low energy electron (LEE) and middle energy electron (MEE) recommended by the sixth Coupled Model Intercomparison Project (CMIP6), the SOCOL-EPP-ECNU model was established. Using this model, the sensitivity test and the evaluation of the effect of energetic electron precipitation on reactive nitrogen (NOx) and ozone in the middle-upper atmosphere were performed. The results showed that the model is highly sensitive to the upper boundary condition of the NOx flux produced by the LEE effect, which is of decisively significance to the simulation effect of the model. The model simulations for NOx concentrations and temperature in the middle and lower stratosphere of the Northern Hemispheric are improved after adding limits of LEE and MEE fluxes. The simulation results indicated that the model description of energetic particle precipitation can be further improved by considering LEE and MEE, and such is helpful to improve the accuracy of the model in simulating atmospheric chemical compositions and climatic elements.

Key words: energetic electron precipitation; reactive nitrogen (NOx); ozone; numerical simulation; coupled chemistry-climate model

EARTH AND ENVIRONMENT Vol.48, No.5, Tot No.337, 2020, Page 537-543