气候变化领域集成服务门户(CCPortal): Retrieving tropospheric NO2 vertical column densities around the city of Beijing and estimating NOx emissions based on car MAX-DOAS measurements

CCPortal

DOI	10.5194/acp-20-10757-2020
	Retrieving tropospheric NO2 vertical column densities around the city of Beijing and estimating NOx emissions based on car MAX-DOAS measurements
	Cheng X.; Ma J.; Jin J.; Guo J.; Liu Y.; Peng J.; Ma X.; Qian M.; Xia Q.; Yan P.
发表日期	2020
ISSN	1680-7316
起始页码	10757
结束页码	10774
卷号	20 期号:17
英文摘要	We carried out 19 city-circle-Around car multi-Axis differential optical absorption spectroscopy (MAX-DOAS) experiments on the 6th Ring Road of Beijing in January, September, and October 2014. The tropospheric vertical column densities (VCDs) of NO2 were retrieved from measured spectra by the MAX-DOAS technique and used to estimate the emissions of NOx (NOCNO2) from urban Beijing during the experimental periods. The offline LAPS-WRFCMAQ model system was used to simulate the wind fields by assimilation of observational data and calculate the NO2-To-NOx concentration ratios, both of which are also needed for the estimation of NOx emissions. The NOx emissions in urban Beijing for the different months derived from the car MAX-DOAS measurements in this study were compared to the multi-resolution emission inventory in China for 2012 (MEIC 2012). Our car MAX-DOAS measurements showed higher NO2 VCD in January than in the other two months. The wind field had obvious impacts on the spatial distribution of NO2 VCD, with the mean NO2 VCD along the 6th Ring Road typically being higher under the southerly wind than under the northerly wind. In addition to the seasonal difference, the journey-To-journey variations of estimated NOx emission rates (ENOx ) were large even within the same month, mainly due to uncertainties in the calculations of wind speed, the ratio of NO2 and NOx concentration, and the decay rate of NOx from the emission sources to the measured positions under different meteorological conditions. The ranges of ENOx during the heating and non-heating periods were 22:61025 to 31:31025 and 9:61025 to 12:01025 molec. s-1, respectively. The average ENOx values in the heating and non-heating periods were 26:96:11025 molec. s-1 and 11:01:21025 molec. s-1, respectively. The uncertainty range of ENOx was 20 %-52 %. The monthly emission rates from MEIC 2012 are found to be lower than the estimated ENOx , particularly in January. Our results provide important information and datasets for the validation of satellite products and also show how car MAX-DOAS measurements can be used effectively for dynamic monitoring and updating of the NOx emissions from megacities such as Beijing. © 2020 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	air quality; atmospheric chemistry; emission inventory; model validation; nitrogen dioxide; nitrogen oxides; pollution monitoring; troposphere; urban atmosphere; wind field; Beijing [Beijing (ADS)]; Beijing [China]; China
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247524
作者单位	State Key Lab of Severe Weather and Key Laboratory for Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing, 100081, China; Cma Meteorological Observation Centre, Beijing, 100081, China; College of Architecture and Environment, Sichuan University, Chengdu, 610065, China; Meteorological Institute of Fujian, Fuzhou, 350001, China; Nanjing University of Information Science and Technology, Nanjing, 210044, China; China National Huayun Technology Development Corporation, Beijing, 100081, China
推荐引用方式 GB/T 7714	Cheng X.,Ma J.,Jin J.,et al. Retrieving tropospheric NO2 vertical column densities around the city of Beijing and estimating NOx emissions based on car MAX-DOAS measurements[J],2020,20(17).
APA	Cheng X..,Ma J..,Jin J..,Guo J..,Liu Y..,...&Yan P..(2020).Retrieving tropospheric NO2 vertical column densities around the city of Beijing and estimating NOx emissions based on car MAX-DOAS measurements.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(17).
MLA	Cheng X.,et al."Retrieving tropospheric NO2 vertical column densities around the city of Beijing and estimating NOx emissions based on car MAX-DOAS measurements".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.17(2020).