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Spatio-temporal variations in NO2 and SO2 over Shanghai and Chongming Eco-Island measured by Ozone Monitoring Instrument (OMI) during 2008-2017

Xue, Ruibin and Wang, Shanshan and Li, Danran and Zou, Zhong and Chan, Ka Lok and Valks, Pieter and Saiz-Lopez, Alfonso and Zhou, Bin (2020) Spatio-temporal variations in NO2 and SO2 over Shanghai and Chongming Eco-Island measured by Ozone Monitoring Instrument (OMI) during 2008-2017. Journal of Cleaner Production, 258, 120563/1-120563/14. Elsevier. doi: 10.1016/j.jclepro.2020.120563. ISSN 0959-6526.

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Official URL: https://doi.org/10.1016/j.jclepro.2020.120563


High resolution satellite maps are useful for the identification of pollution hotspots. In this work, nitrogen dioxide (NO2) and sulfur dioxide (SO2) observations from the Ozone Monitoring Instrument (OMI) have been averaged and gridded for Shanghai and surrounding areas with a spatial resolution of 0.01x 0.01 degrees. The pollution maps have been used to investigate the spatio-temporal variations in NO2 and SO2 from 2008 to 2017. The averaged tropospheric NO2 and planetary boundary layer (PBL) SO2 columns in Shanghai are on average 1.40e16 molec/cm2 and 1.21e16 molec/cm2, respectively. As the government has put a lot of effort to improve the air quality, both the NO2 and SO2 columns reveal a significant decline in Shanghai during the past decade, with a reduction of ~24% and ~56%, respectively, which is also confirmed by the good agreement between satellite observations and ground-based in-situ measurements. The NO2 and SO2 time series also show distinct seasonal characteristics with higher pollution level during winter and lower in the summer. Due to the impact of ship and industrial emissions, the hotspots of NO2 and SO2 are concentrated in the northern part of Shanghai, while the pollution level is lower in the southern and eastern regions. Decreasing trends in NO2 and SO2 are found for most areas of Shanghai during the past decade, though the strongest decrease in the northern part of the city (1.4e15 molec/cm2/year for NO2 and 3.0e15 molec/cm2/year for SO2). Comparisons with the China Multi-Resolution Emissions Inventory (MEIC) indicate that the driving factors for the decline of NO2 and SO2 are mainly denitration and desulfurization in the power sector, and the reduction of emissions in the industry sector. We also use aerosol optical depth (AOD) measurements from MODerate-resolution Imaging Spectroradiometer (MODIS) to investigate the relationship between gas phase pollutants and formation of secondary aerosol. Compared to SO2, the contribution of NO2 to secondary aerosol formation increased in the central part of Shanghai. Although Chongming Eco-Island has developed rapidly in recent years, both the SO2 and NO2 levels decreased significantly. This is mainly related to the strict emission control policy and improved urban planning, and indicates that ecological development is achievable under the guidance of policies.

Item URL in elib:https://elib.dlr.de/134258/
Document Type:Article
Title:Spatio-temporal variations in NO2 and SO2 over Shanghai and Chongming Eco-Island measured by Ozone Monitoring Instrument (OMI) during 2008-2017
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Xue, RuibinFudan University, Shanghai, ChinaUNSPECIFIED
Wang, ShanshanFudan University, Shanghai, ChinaUNSPECIFIED
Li, DanranFudan University, Shanghai, ChinaUNSPECIFIED
Zou, ZhongFudan University, Shanghai, ChinaUNSPECIFIED
Chan, Ka LokKa.Chan (at) dlr.deUNSPECIFIED
Valks, PieterPieter.Valks (at) dlr.deUNSPECIFIED
Saiz-Lopez, AlfonsoCSIC, Madrid, SpanienUNSPECIFIED
Zhou, BinFudan University, Shanghai,ChinaUNSPECIFIED
Journal or Publication Title:Journal of Cleaner Production
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jclepro.2020.120563
Page Range:120563/1-120563/14
Keywords:NO2, SO2, air quality, Shanghai, Chongming, Eco-Island, OMI, satellite
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Valks, Dr. Pieter
Deposited On:09 Mar 2020 13:18
Last Modified:18 May 2020 17:45

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