A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases
International audience This paper describes a broadband cavity ringdown spectrometer and its deployment during the 2002 North Atlantic Marine Boundary Layer Experiment (NAMBLEX) to measure ambient concentrations of NO 3 , N 2 O 5 , I 2 and OIO at the Mace Head Atmospheric Research Station, Co. Galwa...
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ftccsdartic:oai:HAL:hal-00295745v1 2023-11-12T04:22:47+01:00 A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases Bitter, M. Ball, S. M. Povey, I. M. Jones, R. L. Centre for Atmospheric Science Cambridge, UK University of Cambridge UK (CAM) 2005-09-23 https://hal.science/hal-00295745 https://hal.science/hal-00295745/document https://hal.science/hal-00295745/file/acp-5-2547-2005.pdf en eng HAL CCSD European Geosciences Union hal-00295745 https://hal.science/hal-00295745 https://hal.science/hal-00295745/document https://hal.science/hal-00295745/file/acp-5-2547-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00295745 Atmospheric Chemistry and Physics, 2005, 5 (9), pp.2547-2560 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftccsdartic 2023-10-21T23:17:37Z International audience This paper describes a broadband cavity ringdown spectrometer and its deployment during the 2002 North Atlantic Marine Boundary Layer Experiment (NAMBLEX) to measure ambient concentrations of NO 3 , N 2 O 5 , I 2 and OIO at the Mace Head Atmospheric Research Station, Co. Galway, Ireland. The effective absorption path lengths accessible with the spectrometer generally exceeded 10 km, enabling sensitive localised ``point" measurements of atmospheric absorbers to be made adjacent to the other instruments monitoring chemically related species at the same site. For the majority of observations, the spectrometer was used in an open path configuration thereby avoiding surface losses of reactive species. A subset of observations targeted the N 2 O 5 molecule by detecting the additional NO 3 formed by the thermal dissociation of N 2 O 5 . In all cases the concentrations of the atmospheric absorbers were retrieved by fitting the differential structure in the broadband cavity ringdown spectra using a methodology adapted from long path differential optical absorption spectroscopy. The uncertainty of the retrieval depends crucially on the correct treatment and fitting of the absorption bands due to water vapour, a topic that is discussed in the context of analysing broadband cavity ringdown spectra. The quality of the measurements and the retrieval method are illustrated with representative spectra acquired during NAMBLEX in spectral regions around 660 nm (NO 3 and N 2 O 5 ) and 570 nm (I 2 and OIO). Typical detection limits were 1 pptv for NO 3 in an integration time of 100 s, 4 pptv for OIO and 20 pptv for I 2 in an integration time of 10 min. Additionally, the concentrations of atmospheric water vapour and the aerosol optical extinction were retrieved in both spectral regions. A companion paper in this issue presents the time series of the measurements and discusses their significance for understanding the variability of short lived nitrogen and iodine compounds in the marine boundary layer. Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Mace ENVELOPE(155.883,155.883,-81.417,-81.417) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Bitter, M. Ball, S. M. Povey, I. M. Jones, R. L. A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience This paper describes a broadband cavity ringdown spectrometer and its deployment during the 2002 North Atlantic Marine Boundary Layer Experiment (NAMBLEX) to measure ambient concentrations of NO 3 , N 2 O 5 , I 2 and OIO at the Mace Head Atmospheric Research Station, Co. Galway, Ireland. The effective absorption path lengths accessible with the spectrometer generally exceeded 10 km, enabling sensitive localised ``point" measurements of atmospheric absorbers to be made adjacent to the other instruments monitoring chemically related species at the same site. For the majority of observations, the spectrometer was used in an open path configuration thereby avoiding surface losses of reactive species. A subset of observations targeted the N 2 O 5 molecule by detecting the additional NO 3 formed by the thermal dissociation of N 2 O 5 . In all cases the concentrations of the atmospheric absorbers were retrieved by fitting the differential structure in the broadband cavity ringdown spectra using a methodology adapted from long path differential optical absorption spectroscopy. The uncertainty of the retrieval depends crucially on the correct treatment and fitting of the absorption bands due to water vapour, a topic that is discussed in the context of analysing broadband cavity ringdown spectra. The quality of the measurements and the retrieval method are illustrated with representative spectra acquired during NAMBLEX in spectral regions around 660 nm (NO 3 and N 2 O 5 ) and 570 nm (I 2 and OIO). Typical detection limits were 1 pptv for NO 3 in an integration time of 100 s, 4 pptv for OIO and 20 pptv for I 2 in an integration time of 10 min. Additionally, the concentrations of atmospheric water vapour and the aerosol optical extinction were retrieved in both spectral regions. A companion paper in this issue presents the time series of the measurements and discusses their significance for understanding the variability of short lived nitrogen and iodine compounds in the marine boundary layer. |
author2 |
Centre for Atmospheric Science Cambridge, UK University of Cambridge UK (CAM) |
format |
Article in Journal/Newspaper |
author |
Bitter, M. Ball, S. M. Povey, I. M. Jones, R. L. |
author_facet |
Bitter, M. Ball, S. M. Povey, I. M. Jones, R. L. |
author_sort |
Bitter, M. |
title |
A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases |
title_short |
A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases |
title_full |
A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases |
title_fullStr |
A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases |
title_full_unstemmed |
A broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases |
title_sort |
broadband cavity ringdown spectrometer for in-situ measurements of atmospheric trace gases |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00295745 https://hal.science/hal-00295745/document https://hal.science/hal-00295745/file/acp-5-2547-2005.pdf |
long_lat |
ENVELOPE(155.883,155.883,-81.417,-81.417) |
geographic |
Mace |
geographic_facet |
Mace |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-00295745 Atmospheric Chemistry and Physics, 2005, 5 (9), pp.2547-2560 |
op_relation |
hal-00295745 https://hal.science/hal-00295745 https://hal.science/hal-00295745/document https://hal.science/hal-00295745/file/acp-5-2547-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782337719076126720 |