High gas-phase mixing ratios of formic and acetic acid in the High Arctic
Formic and acetic acid are ubiquitous and abundant in the Earth's atmosphere and are important contributors to cloud water acidity, especially in remote regions. Their global sources are not well understood, as evidenced by the inability of models to reproduce the magnitude of measured mixing r...
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ftunicolboulder:oai:scholar.colorado.edu:cires_facpapers-1107 2023-05-15T14:54:15+02:00 High gas-phase mixing ratios of formic and acetic acid in the High Arctic Mungall, Emma L. Abbatt, Jonathan P.D. Wentzell, Jeremy Wentworth, Gregory R. Murphy, Jennifer G. Kunkel, Daniel Gute, Ellen Tarasick, David W. Sharma, Sangeeta Cox, Christopher J. Uttal, Taneil Liggio, John 2018-07-01T07:00:00Z application/pdf https://scholar.colorado.edu/cires_facpapers/110 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1107&context=cires_facpapers unknown CU Scholar https://scholar.colorado.edu/cires_facpapers/110 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1107&context=cires_facpapers http://creativecommons.org/licenses/by/4.0/ CC-BY Cooperative Institute for Research in Environmental Sciences Faculty Contributions text 2018 ftunicolboulder 2019-05-31T23:29:20Z Formic and acetic acid are ubiquitous and abundant in the Earth's atmosphere and are important contributors to cloud water acidity, especially in remote regions. Their global sources are not well understood, as evidenced by the inability of models to reproduce the magnitude of measured mixing ratios, particularly at high northern latitudes. The scarcity of measurements at those latitudes is also a hindrance to understanding these acids and their sources. Here, we present ground-based gas-phase measurements of formic acid (FA) and acetic acid (AA) in the Canadian Arctic collected at 0.5 Hz with a high-resolution chemical ionization time-of-flight mass spectrometer using the iodide reagent ion (iodide HR-ToF-CIMS, Aerodyne). This study was conducted at Alert, Nunavut, in the early summer of 2016. FA and AA mixing ratios for this period show high temporal variability and occasional excursions to very high values (up to 11 and 40 ppbv respectively). High levels of FA and AA were observed under two very different conditions: under overcast, cold conditions during which physical equilibrium partitioning should not favor their emission, and during warm and sunny periods. During the latter, sunny periods, the FA and AA mixing ratios also displayed diurnal cycles in keeping with a photochemical source near the ground. These observations highlight the complexity of the sources of FA and AA, and suggest that current chemical transport model implementations of the sources of FA and AA in the Arctic may be incomplete. Text Arctic Nunavut University of Colorado, Boulder: CU Scholar Arctic Nunavut |
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University of Colorado, Boulder: CU Scholar |
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ftunicolboulder |
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description |
Formic and acetic acid are ubiquitous and abundant in the Earth's atmosphere and are important contributors to cloud water acidity, especially in remote regions. Their global sources are not well understood, as evidenced by the inability of models to reproduce the magnitude of measured mixing ratios, particularly at high northern latitudes. The scarcity of measurements at those latitudes is also a hindrance to understanding these acids and their sources. Here, we present ground-based gas-phase measurements of formic acid (FA) and acetic acid (AA) in the Canadian Arctic collected at 0.5 Hz with a high-resolution chemical ionization time-of-flight mass spectrometer using the iodide reagent ion (iodide HR-ToF-CIMS, Aerodyne). This study was conducted at Alert, Nunavut, in the early summer of 2016. FA and AA mixing ratios for this period show high temporal variability and occasional excursions to very high values (up to 11 and 40 ppbv respectively). High levels of FA and AA were observed under two very different conditions: under overcast, cold conditions during which physical equilibrium partitioning should not favor their emission, and during warm and sunny periods. During the latter, sunny periods, the FA and AA mixing ratios also displayed diurnal cycles in keeping with a photochemical source near the ground. These observations highlight the complexity of the sources of FA and AA, and suggest that current chemical transport model implementations of the sources of FA and AA in the Arctic may be incomplete. |
format |
Text |
author |
Mungall, Emma L. Abbatt, Jonathan P.D. Wentzell, Jeremy Wentworth, Gregory R. Murphy, Jennifer G. Kunkel, Daniel Gute, Ellen Tarasick, David W. Sharma, Sangeeta Cox, Christopher J. Uttal, Taneil Liggio, John |
spellingShingle |
Mungall, Emma L. Abbatt, Jonathan P.D. Wentzell, Jeremy Wentworth, Gregory R. Murphy, Jennifer G. Kunkel, Daniel Gute, Ellen Tarasick, David W. Sharma, Sangeeta Cox, Christopher J. Uttal, Taneil Liggio, John High gas-phase mixing ratios of formic and acetic acid in the High Arctic |
author_facet |
Mungall, Emma L. Abbatt, Jonathan P.D. Wentzell, Jeremy Wentworth, Gregory R. Murphy, Jennifer G. Kunkel, Daniel Gute, Ellen Tarasick, David W. Sharma, Sangeeta Cox, Christopher J. Uttal, Taneil Liggio, John |
author_sort |
Mungall, Emma L. |
title |
High gas-phase mixing ratios of formic and acetic acid in the High Arctic |
title_short |
High gas-phase mixing ratios of formic and acetic acid in the High Arctic |
title_full |
High gas-phase mixing ratios of formic and acetic acid in the High Arctic |
title_fullStr |
High gas-phase mixing ratios of formic and acetic acid in the High Arctic |
title_full_unstemmed |
High gas-phase mixing ratios of formic and acetic acid in the High Arctic |
title_sort |
high gas-phase mixing ratios of formic and acetic acid in the high arctic |
publisher |
CU Scholar |
publishDate |
2018 |
url |
https://scholar.colorado.edu/cires_facpapers/110 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1107&context=cires_facpapers |
geographic |
Arctic Nunavut |
geographic_facet |
Arctic Nunavut |
genre |
Arctic Nunavut |
genre_facet |
Arctic Nunavut |
op_source |
Cooperative Institute for Research in Environmental Sciences Faculty Contributions |
op_relation |
https://scholar.colorado.edu/cires_facpapers/110 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1107&context=cires_facpapers |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766325982235459584 |