Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer
[1] Measurements of OH and HO2 concentrations were made at the surface of the eastern coast of the Hudson Bay during the COBRA campaign from February 18th to March 8th 2008. Diurnally averaged OH and HO2 concentrations peaked at 1.16 (±1.02) × 106 molecule cm−3 and 1.42 (±0.64) × 108 molecule cm−3 r...
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ftleicesterunfig:oai:figshare.com:article/10108274 2023-05-15T16:35:28+02:00 Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer P. Edwards R. Commane T. Ingham D. Stone A. S. Mahajan H. Oetjen J. M. C. Plane D. E. Heard M. J. Evans J. R. Dorsey J. R. Hopkins J. D. Lee S. J. Moller L. J. Carpenter R. Leigh 2011-11-22T00:00:00Z https://figshare.com/articles/journal_contribution/Hydrogen_oxide_photochemistry_in_the_northern_Canadian_spring_time_boundary_layer/10108274 unknown 2381/11335 https://figshare.com/articles/journal_contribution/Hydrogen_oxide_photochemistry_in_the_northern_Canadian_spring_time_boundary_layer/10108274 All Rights Reserved Uncategorized IR content Text Journal contribution 2011 ftleicesterunfig 2021-11-11T20:06:39Z [1] Measurements of OH and HO2 concentrations were made at the surface of the eastern coast of the Hudson Bay during the COBRA campaign from February 18th to March 8th 2008. Diurnally averaged OH and HO2 concentrations peaked at 1.16 (±1.02) × 106 molecule cm−3 and 1.42 (±0.64) × 108 molecule cm−3 respectively. A box-model, constrained to supporting observations, is used to access the radical budget in this cold, northerly environment. Formaldehyde (HCHO) photolysis is found to be the dominant daytime radical source, providing 74% of the observed HOx. A considerable (>80% of the total source) surface HCHO source is required to reconcile the model and observed HCHO concentrations. Model simulations also suggest significant roles for the heterogeneous loss of HO2 and for halogen chemistry in the cycling of HO2 to OH. The formation of HO2NO2 is identified as an important radical reservoir, reducing HOx concentrations during the day and enhancing them at night. This impacts both local oxidizing capacity and reduces local ozone production by approximately 30%. The sensitivity of the local chemistry to uncertainties in these processes is explored. The majority of these processes are not currently represented in global chemistry models. Other Non-Article Part of Journal/Newspaper Hudson Bay University of Leicester: Figshare Hudson Bay Hudson |
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University of Leicester: Figshare |
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ftleicesterunfig |
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Uncategorized IR content |
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Uncategorized IR content P. Edwards R. Commane T. Ingham D. Stone A. S. Mahajan H. Oetjen J. M. C. Plane D. E. Heard M. J. Evans J. R. Dorsey J. R. Hopkins J. D. Lee S. J. Moller L. J. Carpenter R. Leigh Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer |
topic_facet |
Uncategorized IR content |
description |
[1] Measurements of OH and HO2 concentrations were made at the surface of the eastern coast of the Hudson Bay during the COBRA campaign from February 18th to March 8th 2008. Diurnally averaged OH and HO2 concentrations peaked at 1.16 (±1.02) × 106 molecule cm−3 and 1.42 (±0.64) × 108 molecule cm−3 respectively. A box-model, constrained to supporting observations, is used to access the radical budget in this cold, northerly environment. Formaldehyde (HCHO) photolysis is found to be the dominant daytime radical source, providing 74% of the observed HOx. A considerable (>80% of the total source) surface HCHO source is required to reconcile the model and observed HCHO concentrations. Model simulations also suggest significant roles for the heterogeneous loss of HO2 and for halogen chemistry in the cycling of HO2 to OH. The formation of HO2NO2 is identified as an important radical reservoir, reducing HOx concentrations during the day and enhancing them at night. This impacts both local oxidizing capacity and reduces local ozone production by approximately 30%. The sensitivity of the local chemistry to uncertainties in these processes is explored. The majority of these processes are not currently represented in global chemistry models. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
P. Edwards R. Commane T. Ingham D. Stone A. S. Mahajan H. Oetjen J. M. C. Plane D. E. Heard M. J. Evans J. R. Dorsey J. R. Hopkins J. D. Lee S. J. Moller L. J. Carpenter R. Leigh |
author_facet |
P. Edwards R. Commane T. Ingham D. Stone A. S. Mahajan H. Oetjen J. M. C. Plane D. E. Heard M. J. Evans J. R. Dorsey J. R. Hopkins J. D. Lee S. J. Moller L. J. Carpenter R. Leigh |
author_sort |
P. Edwards |
title |
Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer |
title_short |
Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer |
title_full |
Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer |
title_fullStr |
Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer |
title_full_unstemmed |
Hydrogen oxide photochemistry in the northern Canadian spring time boundary layer |
title_sort |
hydrogen oxide photochemistry in the northern canadian spring time boundary layer |
publishDate |
2011 |
url |
https://figshare.com/articles/journal_contribution/Hydrogen_oxide_photochemistry_in_the_northern_Canadian_spring_time_boundary_layer/10108274 |
geographic |
Hudson Bay Hudson |
geographic_facet |
Hudson Bay Hudson |
genre |
Hudson Bay |
genre_facet |
Hudson Bay |
op_relation |
2381/11335 https://figshare.com/articles/journal_contribution/Hydrogen_oxide_photochemistry_in_the_northern_Canadian_spring_time_boundary_layer/10108274 |
op_rights |
All Rights Reserved |
_version_ |
1766025684988198912 |