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Diurnal variability of gas phase and surface water ethanol in southeastern North Carolina, USA.

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Title: Diurnal variability of gas phase and surface water ethanol in southeastern North Carolina, USA.
Authors: Kieber, R.J.1 Kieberr@uncw.edu, Powell, J.P.1, Foley, L.1, Mead, R.N.1, Willey, J.D.1, Avery, G.B.1
Source: Atmospheric Environment. Nov2017, Vol. 168, p55-61. 7p.
Subject Terms: *Acetaldehyde, *Troposphere, *Biomass energy, *Biogeochemical cycles, Gas phase reactions
Geographic Terms: North Carolina
Abstract: Diurnal variations in gas phase and surface water concentrations of ethanol and acetaldehyde were investigated at five locations in southeastern North Carolina, USA. There were distinct diurnal oscillations observed in gas phase concentrations with maxima occurring in late afternoon suggesting that photochemical production is an important process in the cycling of these analytes in the troposphere. The rapid decrease in concentrations after the mid day maximum suggests that there is also an atmospheric photochemical sink for both analytes most likely involving photo produced hydroxyl radicals with a half-life on the order of hours rather than days at ground level. Ethanol concentrations in the surface microlayer taken at the same time as gas phase samples had a very similar diurnal profile suggesting photochemical processes, in addition to atmospheric deposition, play a role in the aqueous phase cycling of both analytes. The concentration of ethanol and acetaldehyde increased significantly in flasks containing freshwater collected from the Cape Fear River exposed to simulated sunlight for 6 h underscoring the importance of in situ photochemical production. Results of this study are significant because they represent the first simultaneous analyses of the temporal variability of ethanol and acetaldehyde concentrations in the gas and aqueous phases. These measurements are essential in order to better define the processes involved in the global biogeochemical cycling of ethanol both now and in the future as our use of the biofuel continues to grow. [ABSTRACT FROM AUTHOR]
Copyright of Atmospheric Environment is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Header DbId: 8gh
DbLabel: GreenFILE
An: 125285877
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Diurnal variability of gas phase and surface water ethanol in southeastern North Carolina, USA.
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  Data: <searchLink fieldCode="AR" term="%22Kieber%2C+R%2EJ%2E%22">Kieber, R.J.</searchLink><relatesTo>1</relatesTo><i> Kieberr@uncw.edu</i><br /><searchLink fieldCode="AR" term="%22Powell%2C+J%2EP%2E%22">Powell, J.P.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Foley%2C+L%2E%22">Foley, L.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mead%2C+R%2EN%2E%22">Mead, R.N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Willey%2C+J%2ED%2E%22">Willey, J.D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Avery%2C+G%2EB%2E%22">Avery, G.B.</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Atmospheric+Environment%22">Atmospheric Environment</searchLink>. Nov2017, Vol. 168, p55-61. 7p.
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  Data: *<searchLink fieldCode="DE" term="%22Acetaldehyde%22">Acetaldehyde</searchLink><br />*<searchLink fieldCode="DE" term="%22Troposphere%22">Troposphere</searchLink><br />*<searchLink fieldCode="DE" term="%22Biomass+energy%22">Biomass energy</searchLink><br />*<searchLink fieldCode="DE" term="%22Biogeochemical+cycles%22">Biogeochemical cycles</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+phase+reactions%22">Gas phase reactions</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22North+Carolina%22">North Carolina</searchLink>
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  Data: Diurnal variations in gas phase and surface water concentrations of ethanol and acetaldehyde were investigated at five locations in southeastern North Carolina, USA. There were distinct diurnal oscillations observed in gas phase concentrations with maxima occurring in late afternoon suggesting that photochemical production is an important process in the cycling of these analytes in the troposphere. The rapid decrease in concentrations after the mid day maximum suggests that there is also an atmospheric photochemical sink for both analytes most likely involving photo produced hydroxyl radicals with a half-life on the order of hours rather than days at ground level. Ethanol concentrations in the surface microlayer taken at the same time as gas phase samples had a very similar diurnal profile suggesting photochemical processes, in addition to atmospheric deposition, play a role in the aqueous phase cycling of both analytes. The concentration of ethanol and acetaldehyde increased significantly in flasks containing freshwater collected from the Cape Fear River exposed to simulated sunlight for 6 h underscoring the importance of in situ photochemical production. Results of this study are significant because they represent the first simultaneous analyses of the temporal variability of ethanol and acetaldehyde concentrations in the gas and aqueous phases. These measurements are essential in order to better define the processes involved in the global biogeochemical cycling of ethanol both now and in the future as our use of the biofuel continues to grow. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Atmospheric Environment is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.atmosenv.2017.09.001
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        Text: English
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      – SubjectFull: North Carolina
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              Text: Nov2017
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