Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003
The first measurements of peroxy (HO2+RO2) and hydroxyl (OH) radicals above the arctic snowpack were collected during the summer 2003 campaign at Summit, Greenland. The median measured number densities for peroxy and hydroxyl radicals were 2.2×108 mol cm-3 and 6.4×106 mol cm-3, respectively. The obs...
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2007
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ftcdlib:oai:escholarship.org/ark:/13030/qt2276g7qw 2023-05-15T15:07:50+02:00 Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003 Sjostedt, SJ Huey, LG Tanner, DJ Peischl, J Chen, G Dibb, JE Lefer, B Hutterli, MA Beyersdorf, AJ Blake, NJ Blake, DR Sueper, D Ryerson, T Burkhart, J Stohl, A 5122 - 5137 2007-08-01 application/pdf https://escholarship.org/uc/item/2276g7qw unknown eScholarship, University of California qt2276g7qw https://escholarship.org/uc/item/2276g7qw CC-BY CC-BY Atmospheric Environment, vol 41, iss 24 HOx Greenland polar photochemistry hydroxyl radical summit Meteorology & Atmospheric Sciences Environmental Engineering Atmospheric Sciences Statistics article 2007 ftcdlib 2021-06-20T14:23:05Z The first measurements of peroxy (HO2+RO2) and hydroxyl (OH) radicals above the arctic snowpack were collected during the summer 2003 campaign at Summit, Greenland. The median measured number densities for peroxy and hydroxyl radicals were 2.2×108 mol cm-3 and 6.4×106 mol cm-3, respectively. The observed peroxy radical values are in excellent agreement (R2 = 0.83, M / O = 1.06) with highly constrained model predictions. However, calculated hydroxyl number densities are consistently more than a factor of 2 lower than the observed values. These results indicate that our current understanding of radical sources and sinks is in accord with our observations in this environment but that there may be a mechanism that is perturbing the (HO2+RO2)/OH ratio. This observed ratio was also found to depend on meteorological conditions especially during periods of high winds accompanied by blowing snow. Backward transport model simulations indicate that these periods of high winds were characterized by rapid transport (1-2 days) of marine boundary layer air to Summit. These data suggest that the boundary layer photochemistry at Summit may be periodically impacted by halogens. © 2007. Article in Journal/Newspaper Arctic Greenland University of California: eScholarship Arctic Greenland |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
HOx Greenland polar photochemistry hydroxyl radical summit Meteorology & Atmospheric Sciences Environmental Engineering Atmospheric Sciences Statistics |
spellingShingle |
HOx Greenland polar photochemistry hydroxyl radical summit Meteorology & Atmospheric Sciences Environmental Engineering Atmospheric Sciences Statistics Sjostedt, SJ Huey, LG Tanner, DJ Peischl, J Chen, G Dibb, JE Lefer, B Hutterli, MA Beyersdorf, AJ Blake, NJ Blake, DR Sueper, D Ryerson, T Burkhart, J Stohl, A Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003 |
topic_facet |
HOx Greenland polar photochemistry hydroxyl radical summit Meteorology & Atmospheric Sciences Environmental Engineering Atmospheric Sciences Statistics |
description |
The first measurements of peroxy (HO2+RO2) and hydroxyl (OH) radicals above the arctic snowpack were collected during the summer 2003 campaign at Summit, Greenland. The median measured number densities for peroxy and hydroxyl radicals were 2.2×108 mol cm-3 and 6.4×106 mol cm-3, respectively. The observed peroxy radical values are in excellent agreement (R2 = 0.83, M / O = 1.06) with highly constrained model predictions. However, calculated hydroxyl number densities are consistently more than a factor of 2 lower than the observed values. These results indicate that our current understanding of radical sources and sinks is in accord with our observations in this environment but that there may be a mechanism that is perturbing the (HO2+RO2)/OH ratio. This observed ratio was also found to depend on meteorological conditions especially during periods of high winds accompanied by blowing snow. Backward transport model simulations indicate that these periods of high winds were characterized by rapid transport (1-2 days) of marine boundary layer air to Summit. These data suggest that the boundary layer photochemistry at Summit may be periodically impacted by halogens. © 2007. |
format |
Article in Journal/Newspaper |
author |
Sjostedt, SJ Huey, LG Tanner, DJ Peischl, J Chen, G Dibb, JE Lefer, B Hutterli, MA Beyersdorf, AJ Blake, NJ Blake, DR Sueper, D Ryerson, T Burkhart, J Stohl, A |
author_facet |
Sjostedt, SJ Huey, LG Tanner, DJ Peischl, J Chen, G Dibb, JE Lefer, B Hutterli, MA Beyersdorf, AJ Blake, NJ Blake, DR Sueper, D Ryerson, T Burkhart, J Stohl, A |
author_sort |
Sjostedt, SJ |
title |
Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003 |
title_short |
Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003 |
title_full |
Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003 |
title_fullStr |
Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003 |
title_full_unstemmed |
Observations of hydroxyl and the sum of peroxy radicals at Summit, Greenland during summer 2003 |
title_sort |
observations of hydroxyl and the sum of peroxy radicals at summit, greenland during summer 2003 |
publisher |
eScholarship, University of California |
publishDate |
2007 |
url |
https://escholarship.org/uc/item/2276g7qw |
op_coverage |
5122 - 5137 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland |
genre_facet |
Arctic Greenland |
op_source |
Atmospheric Environment, vol 41, iss 24 |
op_relation |
qt2276g7qw https://escholarship.org/uc/item/2276g7qw |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766339257722470400 |