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Estimation of winter time NOx emissions in Hefei, a typical inland city of China, using mobile MAX-DOAS observations

Tan, Wei and Zhao, Shaohua and Liu, Cheng and Chan, Ka Lok and Xie, Zhouqing and Zhu, Yu and Su, Wenjing and Zhang, Chengxin and Liu, Haoran and Xing, Chengzhi and Liu, Jianguo (2018) Estimation of winter time NOx emissions in Hefei, a typical inland city of China, using mobile MAX-DOAS observations. Atmospheric Environment, 200, 228 - 242. Elsevier. ISSN 1352-2310

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Official URL: http://www.sciencedirect.com/science/article/pii/S1352231018308665

Abstract

In this paper, we present a quantitative determination of the NOx emission in Hefei using mobile Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements. The measurements were carried out during winter time from December 2016 to February 2017. The measured NO2 vertical column densities (VCDs) show a strong spatial gradient with higher values within the city center, indicating the majority of NOx emission sources are located at the city center. A significant “holiday effect” was found by comparing measurements taken during weekdays and weekend. The weekend reduction is more significant in the suburban (∼28) compared to the city center (∼13). Mobile measurements of NO2 vertical column densities (VCDs) were analyzed together with meteorological data to determine the NOx emission by applying the loop-integral method. Detailed error analysis of the NOx emission shows the variation of wind field and large measurement gap dominated the total error of NOx emission calculation. The result shows the NOx emission in Hefei during winter time varies in a wide range from 10 × 1024 to 40 × 1024molecs−1 with an average of 18.44 × 1024molecs−1. Our estimation is about 43 lower than the number reported in the previous emission inventory in 2012. The reduction of NOx emission reflects the successful implementation of emission control measures in recent years. Our result also shows about 73 of the total NOx in the city were transported from outside of the city during winter. The impacts of transported NOx are especially large when air masses originated from heavily polluted regions, i.e. North China Plain and Yangtze River Delta. The result presented provides a better understanding of the impacts of local emissions and transportation of pollutants on the local air quality of Hefei.

Item URL in elib:https://elib.dlr.de/129096/
Document Type:Article
Title:Estimation of winter time NOx emissions in Hefei, a typical inland city of China, using mobile MAX-DOAS observations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Tan, WeiUniversity of Science and Technology of ChinaUNSPECIFIED
Zhao, ShaohuaMinistry of Ecology and Environment of ChinaUNSPECIFIED
Liu, ChengUniversity of Science and Technology of ChinaUNSPECIFIED
Chan, Ka Lokka.chan (at) dlr.deUNSPECIFIED
Xie, ZhouqingUniversity of Science and Technology of ChinaUNSPECIFIED
Zhu, YuAnhui Environmental Monitoring CenterUNSPECIFIED
Su, WenjingUniversity of Science and Technology of ChinaUNSPECIFIED
Zhang, ChengxinUniversity of Science and Technology of ChinaUNSPECIFIED
Liu, HaoranUniversity of Science and Technology of ChinaUNSPECIFIED
Xing, ChengzhiUniversity of Science and Technology of ChinaUNSPECIFIED
Liu, JianguoAnhui Institute of Optics and Fine MechanicsUNSPECIFIED
Date:3 December 2018
Journal or Publication Title:Atmospheric Environment
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:200
Page Range:228 - 242
Publisher:Elsevier
ISSN:1352-2310
Status:Published
Keywords:NO emission, Mobile measurement, MAX-DOAS, Regional transport
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Chan, Ka Lok
Deposited On:23 Sep 2019 12:12
Last Modified:01 May 2020 03:00

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