Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008
The Greenland Summit Halogen-HOx (GSHOX) Campaign was performed in spring 2007 and summer 2008 to investigate the impact of halogens on HOx (= OH + HO2) cycling above the Greenland Ice Sheet. Chemical species including hydroxyl and peroxy radicals (OH and HO2+ RO2), ozone (O3), nitrogen oxide (NO),...
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ftuninhampshire:oai:scholars.unh.edu:earthsci_facpub-1159 2023-05-15T16:27:34+02:00 Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 Liao, J Huey, L Gregory Tanner, D Brough, N Brooks, Steve Dibb, Jack E. Stutz, J Thomas, J L Lefer, Barry Haman, C Gorham, K 2011-08-23T07:00:00Z application/pdf https://scholars.unh.edu/earthsci_facpub/160 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1159&context=earthsci_facpub unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/earthsci_facpub/160 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1159&context=earthsci_facpub © Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY Earth Sciences Scholarship Atmospheric Sciences text 2011 ftuninhampshire 2023-01-30T21:34:20Z The Greenland Summit Halogen-HOx (GSHOX) Campaign was performed in spring 2007 and summer 2008 to investigate the impact of halogens on HOx (= OH + HO2) cycling above the Greenland Ice Sheet. Chemical species including hydroxyl and peroxy radicals (OH and HO2+ RO2), ozone (O3), nitrogen oxide (NO), nitric acid (HNO3), nitrous acid (HONO), reactive gaseous mercury (RGM), and bromine oxide (BrO) were measured during the campaign. The median midday values of HO2 + RO2 and OH concentrations observed by chemical ionization mass spectrometry (CIMS) were 2.7 × 108 molec cm−3 and 3.0 × 106 molec cm−3 in spring 2007, and 4.2 × 108 molec cm−3 and 4.1 × 106 molec cm−3 in summer 2008. A basic photochemical 0-D box model highly constrained by observations of H2O, O3, CO, CH4, NO, and J values predicted HO2 + RO2 (R = 0.90, slope = 0.87 in 2007; R = 0.79, slope = 0.96 in 2008) reasonably well and under predicted OH (R = 0.83, slope = 0.72 in 2007; R = 0.76, slope = 0.54 in 2008). Constraining the model to HONO observations did not significantly improve the ratio of OH to HO2 + RO2 and the correlation between predictions and observations. Including bromine chemistry in the model constrained by observations of BrO improved the correlation between observed and predicted HO2 + RO2 and OH, and brought the average hourly OH and HO2 + RO2 predictions closer to the observations. These model comparisons confirmed our understanding of the dominant HOx sources and sinks in this environment and indicated that BrO impacted the OH levels at Summit. Although, significant discrepancies between observed and predicted OH could not be explained by the measured BrO. Finally, observations of enhanced RGM were found to be coincident with under prediction of OH. Text Greenland Ice Sheet University of New Hampshire: Scholars Repository Greenland |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
topic |
Atmospheric Sciences |
spellingShingle |
Atmospheric Sciences Liao, J Huey, L Gregory Tanner, D Brough, N Brooks, Steve Dibb, Jack E. Stutz, J Thomas, J L Lefer, Barry Haman, C Gorham, K Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
topic_facet |
Atmospheric Sciences |
description |
The Greenland Summit Halogen-HOx (GSHOX) Campaign was performed in spring 2007 and summer 2008 to investigate the impact of halogens on HOx (= OH + HO2) cycling above the Greenland Ice Sheet. Chemical species including hydroxyl and peroxy radicals (OH and HO2+ RO2), ozone (O3), nitrogen oxide (NO), nitric acid (HNO3), nitrous acid (HONO), reactive gaseous mercury (RGM), and bromine oxide (BrO) were measured during the campaign. The median midday values of HO2 + RO2 and OH concentrations observed by chemical ionization mass spectrometry (CIMS) were 2.7 × 108 molec cm−3 and 3.0 × 106 molec cm−3 in spring 2007, and 4.2 × 108 molec cm−3 and 4.1 × 106 molec cm−3 in summer 2008. A basic photochemical 0-D box model highly constrained by observations of H2O, O3, CO, CH4, NO, and J values predicted HO2 + RO2 (R = 0.90, slope = 0.87 in 2007; R = 0.79, slope = 0.96 in 2008) reasonably well and under predicted OH (R = 0.83, slope = 0.72 in 2007; R = 0.76, slope = 0.54 in 2008). Constraining the model to HONO observations did not significantly improve the ratio of OH to HO2 + RO2 and the correlation between predictions and observations. Including bromine chemistry in the model constrained by observations of BrO improved the correlation between observed and predicted HO2 + RO2 and OH, and brought the average hourly OH and HO2 + RO2 predictions closer to the observations. These model comparisons confirmed our understanding of the dominant HOx sources and sinks in this environment and indicated that BrO impacted the OH levels at Summit. Although, significant discrepancies between observed and predicted OH could not be explained by the measured BrO. Finally, observations of enhanced RGM were found to be coincident with under prediction of OH. |
format |
Text |
author |
Liao, J Huey, L Gregory Tanner, D Brough, N Brooks, Steve Dibb, Jack E. Stutz, J Thomas, J L Lefer, Barry Haman, C Gorham, K |
author_facet |
Liao, J Huey, L Gregory Tanner, D Brough, N Brooks, Steve Dibb, Jack E. Stutz, J Thomas, J L Lefer, Barry Haman, C Gorham, K |
author_sort |
Liao, J |
title |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_short |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_full |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_fullStr |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_full_unstemmed |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_sort |
observations of hydroxyl and peroxy radicals and the impact of bro at summit, greenland in 2007 and 2008 |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2011 |
url |
https://scholars.unh.edu/earthsci_facpub/160 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1159&context=earthsci_facpub |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Earth Sciences Scholarship |
op_relation |
https://scholars.unh.edu/earthsci_facpub/160 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1159&context=earthsci_facpub |
op_rights |
© Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
_version_ |
1766016965626822656 |