Analysis of the carbon dioxide mole fraction variation and its transmission characteristics in Taiyuan

• Published in: Atmospheric and oceanic science letters = Daqi-he-haiyang-kexue-kuaibao Vol. 13; no. 4; pp. 363 - 370
• Main Authors: ZHANG, Fengsheng, ZHU, Lingyun, YAN, Shiming, GAO, Xing'ai, PEI, Kunning
• Format: Journal Article
• Language: English
• Published: Beijing Taylor & Francis 03-07-2020; KeAi Publishing Communications Ltd; KeAi Communications Co., Ltd
• Subjects: Air masses; Atmospheric carbon dioxide; Carbon dioxide; Diffusion; Diurnal variations; Greenhouse gases; Haze; mole fraction variation; Particulate matter; Taiyuan; transmission characteristics; Wind; Wind data; Wind direction; 传输特征; 大气二氧化碳; 浓度变化
• ISSN: 1674-2834; 2376-6123
• DOI: 10.1080/16742834.2020.1737501

Based on the concentrations of CO
2
, PM
2.5
and PM
1.0
, and conventional meteorological observation data from 2016 to 2018 at Taiyuan station, which belongs to the Shanxi greenhouse gas observation network, the CO2 concentration monthly and daily distribution characteristics, the weekend effect, and the variation characteristics on haze days and non-haze days, are analyzed. By using the Hybrid Single-Particle Lagrangian Integrated Trajectory model (backward trajectory model) and surface wind data, the transmission characteristics of atmospheric CO
2
in Taiyuan are studied in various seasons. The results show that, in Taiyuan, the CO
2
mole fraction in autumn and winter is higher than that in spring and summer, and on haze days is higher than that on non-haze days. The diurnal variation characteristic of CO
2
mole fraction in each season is 'single peak and single valley' with the peak value around 0700 (hereafter refers to Beijing Time) and the valley value around 1600. The CO
2
mole fraction on workdays is slightly higher than that on non-workdays and obviously different around 0800 of the early peak. Horizontal diffusion can reduce the CO
2
mole fraction, while breezy weather is not beneficial to CO
2
diffusion. The wind direction and speed in the upper levels are different from those near the surface, and the close air masses in the southwest-west-northwest sector raise the CO
2
concentration in Taiyuan obviously. This indicates that the CO
2
in Taiyuan is mainly contributed by local sources.