GSTDTAP  > 地球科学
DOI10.5194/acp-19-459-2019
Estimation of atmospheric total organic carbon (TOC) - paving the path towards carbon budget closure
Yang, Mingxi1; Fleming, Zoe L.2,3
2019-01-14
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2019
卷号19期号:1页码:459-471
文章类型Article
语种英语
国家England; Chile
英文摘要

The atmosphere contains a rich variety of reactive organic compounds, including gaseous volatile organic carbon (VOCs), carbonaceous aerosols, and other organic compounds at varying volatility. Here we present a novel and simple approach to measure atmospheric non-methane total organic carbon (TOC) based on catalytic oxidation of organics in bulk air to carbon dioxide. This method shows little sensitivity towards humidity and near 100% oxidation efficiencies for all VOCs tested. We estimate a best-case hourly precision of 8 ppbC during times of low ambient variability in carbon dioxide, methane, and carbon monoxide (CO). As proof of concept of this approach, we show measurements of TOC + CO during August-September 2016 from a coastal city in the southwest United Kingdom. TOC + CO was substantially elevated during the day on weekdays (occasionally over 2 ppm C) as a result of local anthropogenic activity. On weekends and holidays, with a mean (standard error) of 102 (8) ppb C, TOC + CO was lower and showed much less diurnal variability. TOC + CO was significantly lower when winds were coming off the Atlantic Ocean than when winds were coming off land if we exclude the weekday daytime. By subtracting the estimated CO from TOC + CO, we constrain the mean (uncertainty) TOC in Atlantic-dominated air masses to be around 23 (+/- >= 8) ppbC during this period. A proton-transfer-reaction mass spectrometer (PTR-MS) was deployed at the same time, detecting a large range of organic compounds (oxygenated VOCs, biogenic VOCs, aromatics, dimethyl sulfide). The total speciated VOCs from the PTR-MS, denoted here as Sum(VOC), amounted to a mean (uncertainty) of 12 (+/- <= 3) ppbC in marine air. Possible contributions from a number of known organic compounds present in marine air that were not detected by the PTR-MS are assessed within the context of the TOC budget. Finally, we note that the use of a short, heated sample tube can improve the transmission of organics to the analyzer, while operating our system alternately with and without a particle filter should enable a better separation of semi-volatile and particulate organics from the VOCs within the TOC budget. Future concurrent measurements of TOC, CO, and a more comprehensive range of speciated VOCs would enable a better characterization and understanding of the atmospheric organic carbon budget.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000455904800001
WOS关键词VOLATILE ; EXCHANGE ; CO2 ; ACETALDEHYDE ; GENERATION ; EVOLUTION ; AEROSOLS ; NITROGEN ; METHANOL ; DIOXIDE
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/28363
专题地球科学
作者单位1.Plymouth Marine Lab, Plymouth, Devon, England;
2.Univ Leicester, Dept Chem, NCAS, Leicester, Leics, England;
3.Univ Chile, Dept Geofis, Ctr Climate & Resilience Res CR2, Santiago, Chile
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GB/T 7714
Yang, Mingxi,Fleming, Zoe L.. Estimation of atmospheric total organic carbon (TOC) - paving the path towards carbon budget closure[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2019,19(1):459-471.
APA Yang, Mingxi,&Fleming, Zoe L..(2019).Estimation of atmospheric total organic carbon (TOC) - paving the path towards carbon budget closure.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(1),459-471.
MLA Yang, Mingxi,et al."Estimation of atmospheric total organic carbon (TOC) - paving the path towards carbon budget closure".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.1(2019):459-471.
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