Tropospheric sources and sinks of gas-phase acids in the Colorado Front Range
<p>We measured organic and inorganic gas-phase acids in the Front Range of Colorado to better understand their tropospheric sources and sinks using a high-resolution time-of-flight chemical ionization mass spectrometer. Measurements were conducted from 4 to 13 August 2014 at the Boulder At...
| Published in: | Atmospheric Chemistry and Physics |
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| Main Authors: | , , , , , , , , , |
| Format: | Article |
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Copernicus Publications
2018-08-01
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| Online Access: | https://www.atmos-chem-phys.net/18/12315/2018/acp-18-12315-2018.pdf |
| _version_ | 1852750962338299904 |
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| author | J. M. Mattila P. Brophy J. Kirkland S. Hall K. Ullmann E. V. Fischer S. Brown S. Brown E. McDuffie E. McDuffie E. McDuffie A. Tevlin D. K. Farmer |
| author_facet | J. M. Mattila P. Brophy J. Kirkland S. Hall K. Ullmann E. V. Fischer S. Brown S. Brown E. McDuffie E. McDuffie E. McDuffie A. Tevlin D. K. Farmer |
| author_sort | J. M. Mattila |
| collection | DOAJ |
| container_title | Atmospheric Chemistry and Physics |
| description | <p>We measured organic and inorganic gas-phase acids in the
Front Range of Colorado to better understand their tropospheric sources and
sinks using a high-resolution time-of-flight chemical ionization mass
spectrometer. Measurements were conducted from 4 to 13 August 2014 at the
Boulder Atmospheric Observatory during the Front Range Air Pollution and
Photochemistry Éxperiment. Diurnal increases in mixing ratios are
consistent with photochemical sources of HNO<sub>3</sub>, HNCO, formic, propionic,
butyric, valeric, and pyruvic acid. Vertical profiles taken on the 300 m
tower demonstrate net surface-level emissions of alkanoic acids, but net
surface deposition of HNO<sub>3</sub> and pyruvic acid. The surface-level alkanoic
acid source persists through both day and night, and is thus not solely
photochemical. Reactions between O<sub>3</sub> and organic surfaces may contribute
to the surface-level alkanoic acid source. Nearby traffic emissions and
agricultural activity are a primary source of propionic, butyric, and
valeric acids, and likely contribute photochemical precursors to HNO<sub>3</sub>
and HNCO. The combined diel and vertical profiles of the alkanoic acids and
HNCO are inconsistent with dry deposition and photochemical losses being the
only sinks, suggesting additional loss mechanisms.</p> |
| format | Article |
| id | doaj-art-6d640583e79549bdb67445fdf2d64e7e |
| institution | Directory of Open Access Journals |
| issn | 1680-7316 1680-7324 |
| language | English |
| publishDate | 2018-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| spelling | doaj-art-6d640583e79549bdb67445fdf2d64e7e2025-08-19T21:00:11ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-08-0118123151232710.5194/acp-18-12315-2018Tropospheric sources and sinks of gas-phase acids in the Colorado Front RangeJ. M. Mattila0P. Brophy1J. Kirkland2S. Hall3K. Ullmann4E. V. Fischer5S. Brown6S. Brown7E. McDuffie8E. McDuffie9E. McDuffie10A. Tevlin11D. K. Farmer12Department of Chemistry, Colorado State University, Fort Collins, CO, USADepartment of Chemistry, Colorado State University, Fort Collins, CO, USADepartment of Chemistry, Colorado State University, Fort Collins, CO, USAAtmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, USAAtmospheric Chemistry Division, National Center for Atmospheric Research, Boulder, CO, USADepartment of Atmospheric Science, Colorado State University, Fort Collins, CO, USANOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, USADepartment of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, CO, USANOAA Earth System Research Laboratory, Chemical Sciences Division, Boulder, CO, USADepartment of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, CO, USACooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, USADepartment of Chemistry, University of Toronto, Toronto, ON, CanadaDepartment of Chemistry, Colorado State University, Fort Collins, CO, USA<p>We measured organic and inorganic gas-phase acids in the Front Range of Colorado to better understand their tropospheric sources and sinks using a high-resolution time-of-flight chemical ionization mass spectrometer. Measurements were conducted from 4 to 13 August 2014 at the Boulder Atmospheric Observatory during the Front Range Air Pollution and Photochemistry Éxperiment. Diurnal increases in mixing ratios are consistent with photochemical sources of HNO<sub>3</sub>, HNCO, formic, propionic, butyric, valeric, and pyruvic acid. Vertical profiles taken on the 300 m tower demonstrate net surface-level emissions of alkanoic acids, but net surface deposition of HNO<sub>3</sub> and pyruvic acid. The surface-level alkanoic acid source persists through both day and night, and is thus not solely photochemical. Reactions between O<sub>3</sub> and organic surfaces may contribute to the surface-level alkanoic acid source. Nearby traffic emissions and agricultural activity are a primary source of propionic, butyric, and valeric acids, and likely contribute photochemical precursors to HNO<sub>3</sub> and HNCO. The combined diel and vertical profiles of the alkanoic acids and HNCO are inconsistent with dry deposition and photochemical losses being the only sinks, suggesting additional loss mechanisms.</p>https://www.atmos-chem-phys.net/18/12315/2018/acp-18-12315-2018.pdf |
| spellingShingle | J. M. Mattila P. Brophy J. Kirkland S. Hall K. Ullmann E. V. Fischer S. Brown S. Brown E. McDuffie E. McDuffie E. McDuffie A. Tevlin D. K. Farmer Tropospheric sources and sinks of gas-phase acids in the Colorado Front Range |
| title | Tropospheric sources and sinks of gas-phase acids in the Colorado Front Range |
| title_full | Tropospheric sources and sinks of gas-phase acids in the Colorado Front Range |
| title_fullStr | Tropospheric sources and sinks of gas-phase acids in the Colorado Front Range |
| title_full_unstemmed | Tropospheric sources and sinks of gas-phase acids in the Colorado Front Range |
| title_short | Tropospheric sources and sinks of gas-phase acids in the Colorado Front Range |
| title_sort | tropospheric sources and sinks of gas phase acids in the colorado front range |
| url | https://www.atmos-chem-phys.net/18/12315/2018/acp-18-12315-2018.pdf |
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