Night-time radical chemistry during the NAMBLEX campaign.
Night-time chemistry in the Marine Boundary Layer has been modelled using a number of observationally constrained zero-dimensional box-models. The models were based upon the Master Chemical Mechanism (MCM) and the measurements were taken during the North Atlantic Marine Boundary Layer Experiment (NA...
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Online Access: | http://hdl.handle.net/2381/313 http://www.atmos-chem-phys.net/7/587/2007 https://doi.org/10.5194/acp-7-587-2007 |
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ftleicester:oai:lra.le.ac.uk:2381/313 2023-05-15T17:34:53+02:00 Night-time radical chemistry during the NAMBLEX campaign. Sommariva, R. Pilling, Michael J. Bloss, William J. Heard, Dwayne E. Lee, James D. Fleming, Zoe L. Monks, Paul S. Plane, J. M. C. Saiz-Lopez, A. Ball, S. M. Bitter, M. Jones, R. L. Brough, N. Penkett, Stuart A. Hopkins, James R. Lewis, Alastair C. Read, K. A. 2007-02-15T11:45:17Z 778721 bytes application/pdf http://hdl.handle.net/2381/313 http://www.atmos-chem-phys.net/7/587/2007 https://doi.org/10.5194/acp-7-587-2007 en eng Copernicus GmbH Atmospheric Chemistry and Physics, 2007, 7, pp. 587-598. http://hdl.handle.net/2381/313 http://www.atmos-chem-phys.net/7/587/2007 doi:10.5194/acp-7-587-2007 © Author(s) 2007. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. CC-BY-NC-SA Article 2007 ftleicester https://doi.org/10.5194/acp-7-587-2007 2019-03-22T20:13:00Z Night-time chemistry in the Marine Boundary Layer has been modelled using a number of observationally constrained zero-dimensional box-models. The models were based upon the Master Chemical Mechanism (MCM) and the measurements were taken during the North Atlantic Marine Boundary Layer Experiment (NAMBLEX) campaign at Mace Head, Ireland in July–September 2002. The model could reproduce, within the combined uncertainties, the measured concentration of HO2 (within 30–40%) during the night 31 August–1 September and of HO2+RO2 (within 15–30%) during several nights of the campaign. The model always overestimated the NO3 measurements made by Differential Optical Absorption Spectroscopy (DOAS) by up to an order of magnitude or more, but agreed with the NO3 Cavity Ring-Down Spectroscopy (CRDS) measurements to within 30–50%. The most likely explanation of the discrepancy between the two instruments and the model is the reaction of the nitrate radical with inhomogeneously distributed NO, which was measured at concentrations of up to 10 ppt, even though this is not enough to fully explain the difference between the DOAS measurements and the model. A rate of production and destruction analysis showed that radicals were generated during the night mainly by the re- action of ozone with light alkenes. The cycling between HO2/RO2 and OH was maintained during the night by the low concentrations of NO and the overall radical concentration was limited by slow loss of peroxy radicals to form peroxides. A strong peak in [NO2] during the night 31 August–1 September allowed an insight into the radical fluxes and the connections between the HOx and the NO3 cycles. Article in Journal/Newspaper North Atlantic University of Leicester: Leicester Research Archive (LRA) Mace ENVELOPE(155.883,155.883,-81.417,-81.417) Strong Peak ENVELOPE(-82.300,-82.300,-79.933,-79.933) Atmospheric Chemistry and Physics 7 3 587 598 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
description |
Night-time chemistry in the Marine Boundary Layer has been modelled using a number of observationally constrained zero-dimensional box-models. The models were based upon the Master Chemical Mechanism (MCM) and the measurements were taken during the North Atlantic Marine Boundary Layer Experiment (NAMBLEX) campaign at Mace Head, Ireland in July–September 2002. The model could reproduce, within the combined uncertainties, the measured concentration of HO2 (within 30–40%) during the night 31 August–1 September and of HO2+RO2 (within 15–30%) during several nights of the campaign. The model always overestimated the NO3 measurements made by Differential Optical Absorption Spectroscopy (DOAS) by up to an order of magnitude or more, but agreed with the NO3 Cavity Ring-Down Spectroscopy (CRDS) measurements to within 30–50%. The most likely explanation of the discrepancy between the two instruments and the model is the reaction of the nitrate radical with inhomogeneously distributed NO, which was measured at concentrations of up to 10 ppt, even though this is not enough to fully explain the difference between the DOAS measurements and the model. A rate of production and destruction analysis showed that radicals were generated during the night mainly by the re- action of ozone with light alkenes. The cycling between HO2/RO2 and OH was maintained during the night by the low concentrations of NO and the overall radical concentration was limited by slow loss of peroxy radicals to form peroxides. A strong peak in [NO2] during the night 31 August–1 September allowed an insight into the radical fluxes and the connections between the HOx and the NO3 cycles. |
format |
Article in Journal/Newspaper |
author |
Sommariva, R. Pilling, Michael J. Bloss, William J. Heard, Dwayne E. Lee, James D. Fleming, Zoe L. Monks, Paul S. Plane, J. M. C. Saiz-Lopez, A. Ball, S. M. Bitter, M. Jones, R. L. Brough, N. Penkett, Stuart A. Hopkins, James R. Lewis, Alastair C. Read, K. A. |
spellingShingle |
Sommariva, R. Pilling, Michael J. Bloss, William J. Heard, Dwayne E. Lee, James D. Fleming, Zoe L. Monks, Paul S. Plane, J. M. C. Saiz-Lopez, A. Ball, S. M. Bitter, M. Jones, R. L. Brough, N. Penkett, Stuart A. Hopkins, James R. Lewis, Alastair C. Read, K. A. Night-time radical chemistry during the NAMBLEX campaign. |
author_facet |
Sommariva, R. Pilling, Michael J. Bloss, William J. Heard, Dwayne E. Lee, James D. Fleming, Zoe L. Monks, Paul S. Plane, J. M. C. Saiz-Lopez, A. Ball, S. M. Bitter, M. Jones, R. L. Brough, N. Penkett, Stuart A. Hopkins, James R. Lewis, Alastair C. Read, K. A. |
author_sort |
Sommariva, R. |
title |
Night-time radical chemistry during the NAMBLEX campaign. |
title_short |
Night-time radical chemistry during the NAMBLEX campaign. |
title_full |
Night-time radical chemistry during the NAMBLEX campaign. |
title_fullStr |
Night-time radical chemistry during the NAMBLEX campaign. |
title_full_unstemmed |
Night-time radical chemistry during the NAMBLEX campaign. |
title_sort |
night-time radical chemistry during the namblex campaign. |
publisher |
Copernicus GmbH |
publishDate |
2007 |
url |
http://hdl.handle.net/2381/313 http://www.atmos-chem-phys.net/7/587/2007 https://doi.org/10.5194/acp-7-587-2007 |
long_lat |
ENVELOPE(155.883,155.883,-81.417,-81.417) ENVELOPE(-82.300,-82.300,-79.933,-79.933) |
geographic |
Mace Strong Peak |
geographic_facet |
Mace Strong Peak |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Atmospheric Chemistry and Physics, 2007, 7, pp. 587-598. http://hdl.handle.net/2381/313 http://www.atmos-chem-phys.net/7/587/2007 doi:10.5194/acp-7-587-2007 |
op_rights |
© Author(s) 2007. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License. |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/10.5194/acp-7-587-2007 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
7 |
container_issue |
3 |
container_start_page |
587 |
op_container_end_page |
598 |
_version_ |
1766133847434461184 |