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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ftdoajarticles:oai:doaj.org/article:d55a266ab61d4ae3a03d1ef08b255c3b 2023-05-15T17:35:36+02:00 Night-time radical chemistry during the NAMBLEX campaign R. Sommariva M. J. Pilling W. J. Bloss D. E. Heard J. D. Lee Z. L. Fleming P. S. Monks J. M. C. Plane A. Saiz-Lopez S. M. Ball M. Bitter R. L. Jones N. Brough S. A. Penkett J. R. Hopkins A. C. Lewis K. A. Read 2007-01-01T00:00:00Z https://doaj.org/article/d55a266ab61d4ae3a03d1ef08b255c3b EN eng Copernicus Publications http://www.atmos-chem-phys.net/7/587/2007/acp-7-587-2007.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/d55a266ab61d4ae3a03d1ef08b255c3b Atmospheric Chemistry and Physics, Vol 7, Iss 3, Pp 587-598 (2007) Physics QC1-999 Chemistry QD1-999 article 2007 ftdoajarticles 2022-12-31T03:42:42Z 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 HO 2 (within 30–40%) during the night 31 August–1 September and of HO 2 +RO 2 (within 15–30%) during several nights of the campaign. The model always overestimated the NO 3 measurements made by Differential Optical Absorption Spectroscopy (DOAS) by up to an order of magnitude or more, but agreed with the NO 3 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 reaction of ozone with light alkenes. The cycling between HO 2 /RO 2 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 [NO 2 ] during the night 31 August–1 September allowed an insight into the radical fluxes and the connections between the HO x and the NO 3 cycles. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Mace ENVELOPE(155.883,155.883,-81.417,-81.417) Strong Peak ENVELOPE(-82.300,-82.300,-79.933,-79.933) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 R. Sommariva M. J. Pilling W. J. Bloss D. E. Heard J. D. Lee Z. L. Fleming P. S. Monks J. M. C. Plane A. Saiz-Lopez S. M. Ball M. Bitter R. L. Jones N. Brough S. A. Penkett J. R. Hopkins A. C. Lewis K. A. Read Night-time radical chemistry during the NAMBLEX campaign |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
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 HO 2 (within 30–40%) during the night 31 August–1 September and of HO 2 +RO 2 (within 15–30%) during several nights of the campaign. The model always overestimated the NO 3 measurements made by Differential Optical Absorption Spectroscopy (DOAS) by up to an order of magnitude or more, but agreed with the NO 3 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 reaction of ozone with light alkenes. The cycling between HO 2 /RO 2 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 [NO 2 ] during the night 31 August–1 September allowed an insight into the radical fluxes and the connections between the HO x and the NO 3 cycles. |
format |
Article in Journal/Newspaper |
author |
R. Sommariva M. J. Pilling W. J. Bloss D. E. Heard J. D. Lee Z. L. Fleming P. S. Monks J. M. C. Plane A. Saiz-Lopez S. M. Ball M. Bitter R. L. Jones N. Brough S. A. Penkett J. R. Hopkins A. C. Lewis K. A. Read |
author_facet |
R. Sommariva M. J. Pilling W. J. Bloss D. E. Heard J. D. Lee Z. L. Fleming P. S. Monks J. M. C. Plane A. Saiz-Lopez S. M. Ball M. Bitter R. L. Jones N. Brough S. A. Penkett J. R. Hopkins A. C. Lewis K. A. Read |
author_sort |
R. Sommariva |
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 Publications |
publishDate |
2007 |
url |
https://doaj.org/article/d55a266ab61d4ae3a03d1ef08b255c3b |
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_source |
Atmospheric Chemistry and Physics, Vol 7, Iss 3, Pp 587-598 (2007) |
op_relation |
http://www.atmos-chem-phys.net/7/587/2007/acp-7-587-2007.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/d55a266ab61d4ae3a03d1ef08b255c3b |
_version_ |
1766134798735114240 |