Sources of ambient volatile organic compounds and their contributions to photochemical ozone formation at a site in the Pearl River Delta, southern China

2011 ◽  
Vol 159 (10) ◽  
pp. 2310-2319 ◽  
Author(s):  
Z.H. Ling ◽  
H. Guo ◽  
H.R. Cheng ◽  
Y.F. Yu
Keyword(s):  
Organic Compounds ◽  
Pearl River Delta ◽  
Southern China ◽  
Pearl River ◽  
Ozone Formation ◽  
The Pearl River Delta ◽  
Volatile Organic ◽  
Photochemical Ozone ◽  
The Pearl River ◽  
A Site

scholarly journals Hotspot of Glyoxal Over the Pearl River Delta Seen from the OMI Satellite Instrument: Implications for Emissions of Aromatic Hydrocarbons

2016 ◽  
Author(s):  
Christopher Chan Miller ◽  
Daniel J. Jacob ◽  
Gonzalo González Abad ◽  
Kelly Chance
Keyword(s):  
Aromatic Hydrocarbons ◽  
Pearl River Delta ◽  
Transport Model ◽  
Southern China ◽  
River Delta ◽  
Pearl River ◽  
Emission Inventories ◽  
The Pearl River Delta ◽  
Volatile Organic ◽  
The Pearl River

Abstract. The Pearl River Delta (PRD) is a densely populated hub of industrial activity located in southern China. OMI satellite observations reveal a large hotspot of glyoxal (CHOCHO) over the PRD that is almost twice as large as any other in Asia. Formaldehyde (HCHO) and NO2 observed by OMI are also high in the PRD but no more than in other urban/industrial areas of China. The CHOCHO hotspot in the PRD can be explained by industrial paint and solvent emissions of aromatic volatile organic compounds (VOCs), with toluene being a dominant contributor. By contrast, HCHO in the PRD originates mostly from VOCs emitted by combustion (principally vehicles). By applying a plume transport model to wind-segregated OMI data, we show that the CHOCHO and HCHO enhancements over the PRD observed by OMI are consistent with current VOC emission inventories. Prior work using CHOCHO retrievals from the SCIAMACHY satellite instrument suggested that aromatic VOC emissions in the PRD were too low by a factor of 10-20; we attribute this result in part to bias in the SCIAMACHY data and in part to underestimated CHOCHO yields from oxidation of aromatics. Our work points to the importance of better understanding CHOCHO yields from the oxidation of aromatics in order to interpret CHOCHO observations from space.

scholarly journals Characteristics of Volatile Organic Compounds in the Pearl River Delta Region, China: Chemical Reactivity, Source, and Emission Regions

Atmosphere ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 9
Author(s):  
Weiqiang Yang ◽  
Qingqing Yu ◽  
Chenglei Pei ◽  
Chenghao Liao ◽  
Jianjun Liu ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Pearl River Delta ◽  
River Delta ◽  
Pearl River ◽  
Pearl River Delta Region ◽  
Delta Region ◽  
The Pearl River Delta ◽  
Volatile Organic ◽  
The Pearl River

Volatile organic compounds (VOCs) are important precursors of photochemical ozone and secondary organic aerosol (SOA). Here, hourly variations of ambient VOCs were monitored with an online system at an urban site (Panyu, PY) in the Pearl River Delta region during August–September of 2020 in order to identify reactive VOC species and major sources of VOCs, OH loss rate (LOH), SOA formation potential (SOAFP), and corresponding emission source regions. The average concentration of VOCs at PY was 31.80 ± 20.82 ppbv during the campaign. The C2–C5 alkanes, aromatics, and ≥C6 alkanes contributed for the majority of VOC, alkenes and aromatics showed the highest contribution to LOH and SOAFP. Further, m/p-xylene, propene, and toluene were found to be the top three most reactive anthropogenic VOC species, with respective contributions of 11.6%, 6.1%, and 5.8% to total LOH. Toluene, m/p-xylene, and o-xylene constituted a large fraction of calculated SOAFP. Seven major sources were identified by using positive matrix factorization model. Vehicle exhaust made the most significant contribution to VOCs, followed by liquefied petroleum gas and combustion sources. However, industrial-related sources (including industrial solvent use and industrial process emission) had the largest contribution to LOH and SOAFP. By combining source contribution with wind direction and wind speed, the regions of different sources were further identified. Based on high-resolution observation data during ozone pollution, this study clearly exhibits key reactive VOC species and the major emission regions of different VOC sources, and thus benefits the accurate emission control of VOCs in the near future.

scholarly journals Hotspot of glyoxal over the Pearl River delta seen from the OMI satellite instrument: implications for emissions of aromatic hydrocarbons

2016 ◽  
Vol 16 (7) ◽  
pp. 4631-4639 ◽  
Author(s):  
Christopher Chan Miller ◽  
Daniel J. Jacob ◽  
Gonzalo González Abad ◽  
Kelly Chance
Keyword(s):  
Pearl River Delta ◽  
Transport Model ◽  
Southern China ◽  
River Delta ◽  
Pearl River ◽  
Emission Inventories ◽  
Ozone Monitoring Instrument ◽  
The Pearl River Delta ◽  
Volatile Organic ◽  
The Pearl River

Abstract. The Pearl River delta (PRD) is a densely populated hub of industrial activity located in southern China. OMI (Ozone Monitoring Instrument) satellite observations reveal a large hotspot of glyoxal (CHOCHO) over the PRD that is almost twice as large as any other in Asia. Formaldehyde (HCHO) and NO2 observed by OMI are also high in the PRD but no more than in other urban/industrial areas of China. The CHOCHO hotspot over the PRD can be explained by industrial paint and solvent emissions of aromatic volatile organic compounds (VOCs), with toluene being a dominant contributor. By contrast, HCHO in the PRD originates mostly from VOCs emitted by combustion (principally vehicles). By applying a plume transport model to wind-segregated OMI data, we show that the CHOCHO and HCHO enhancements over the PRD observed by OMI are consistent with current VOC emission inventories. Prior work using CHOCHO retrievals from the SCIAMACHY satellite instrument suggested that emission inventories for aromatic VOCs in the PRD were too low by a factor of 10–20; we attribute this result in part to bias in the SCIAMACHY data and in part to underestimated CHOCHO yields from oxidation of aromatics. Our work points to the importance of better understanding CHOCHO yields from the oxidation of aromatics in order to interpret space-based CHOCHO observations in polluted environments.

scholarly journals Assessing photochemical ozone formation in the Pearl River Delta with a photochemical trajectory model

2010 ◽  
Vol 44 (34) ◽  
pp. 4199-4208 ◽  
Author(s):  
H.R. Cheng ◽  
H. Guo ◽  
S.M. Saunders ◽  
S.H.M. Lam ◽  
F. Jiang ◽  
...  
Keyword(s):  
Pearl River Delta ◽  
River Delta ◽  
Pearl River ◽  
Ozone Formation ◽  
Trajectory Model ◽  
The Pearl River Delta ◽  
Photochemical Ozone ◽  
The Pearl River

scholarly journals Volatile Organic Compounds Monitored Online at Three Photochemical Assessment Monitoring Stations in the Pearl River Delta (PRD) Region during Summer 2016: Sources and Emission Areas

Atmosphere ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 327
Author(s):  
Tao Zhang ◽  
Shaoxuan Xiao ◽  
Xinming Wang ◽  
Yanli Zhang ◽  
Chenglei Pei ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Pearl River Delta ◽  
Industrial Processes ◽  
Pearl River ◽  
Emission Sources ◽  
Vehicle Exhaust ◽  
Source Regions ◽  
The Pearl River Delta ◽  
Volatile Organic ◽  
The Pearl River

Volatile organic compounds (VOCs) were monitored online at three photochemical assessment monitoring stations (MDS, WQS and HGS) in the Pearl River Delta region during the summer of 2016. Measured levels of VOCs at the MDS, WQS and HGS sites were 34.78, 8.54 and 8.47 ppbv, respectively, with aromatics and alkenes as major ozone precursors and aromatics as major precursors to secondary organic aerosol (SOA). The positive matrix factorization (PMF) model revealed that VOCs at the sites mainly came from vehicle exhaust, petrochemical industry, and solvent use. Vehicle exhaust and industrial processes losses contributed most to ozone formation potentials (OFP) of VOCs, while industrial processes losses contributed most to SOA formation potentials of VOCs. Potential source contribution function (PSCF) analysis revealed a north-south distribution for source regions of aromatics occurring at MDS with emission sources in Guangzhou mainly centered in the Guangzhou central districts, and source regions of aromatics at WQS showed an east-west distribution across Huizhou, Dongguan and east of Guangzhou, while that at HGS showed a south-north distribution across Guangzhou, Foshan, Zhaoqing and Yangjiang. This study demonstrates that multi-point high time resolution data can help resolve emission sources and locate emission areas of important ozone and SOA precursors.

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