A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011
Atmospheric CO in situ measurements are carried out at the Izaña (Tenerife) global GAW (Global Atmosphere Watch Programme of the World Meteorological Organization – WMO) mountain station using a Reduction Gas Analyser (RGA). In situ measurements at Izaña are representative of the subtropical Northea...
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ftdoajarticles:oai:doaj.org/article:4311af2241dd4af785670f45e6e913f9 2023-05-15T17:41:42+02:00 A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011 A. J. Gomez-Pelaez R. Ramos V. Gomez-Trueba P. C. Novelli R. Campo-Hernandez 2013-03-01T00:00:00Z https://doi.org/10.5194/amt-6-787-2013 https://doaj.org/article/4311af2241dd4af785670f45e6e913f9 EN eng Copernicus Publications http://www.atmos-meas-tech.net/6/787/2013/amt-6-787-2013.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-6-787-2013 1867-1381 1867-8548 https://doaj.org/article/4311af2241dd4af785670f45e6e913f9 Atmospheric Measurement Techniques, Vol 6, Iss 3, Pp 787-799 (2013) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2013 ftdoajarticles https://doi.org/10.5194/amt-6-787-2013 2022-12-30T21:24:48Z Atmospheric CO in situ measurements are carried out at the Izaña (Tenerife) global GAW (Global Atmosphere Watch Programme of the World Meteorological Organization – WMO) mountain station using a Reduction Gas Analyser (RGA). In situ measurements at Izaña are representative of the subtropical Northeast Atlantic free troposphere, especially during nighttime. We present the measurement system configuration, the response function, the calibration scheme, the data processing, the Izaña 2008–2011 CO nocturnal time series, and the mean diurnal cycle by months. We have developed a rigorous uncertainty analysis for carbon monoxide measurements carried out at the Izaña station, which could be applied to other GAW stations. We determine the combined standard measurement uncertainty taking into consideration four contributing components: uncertainty of the WMO standard gases interpolated over the range of measurement, the uncertainty that takes into account the agreement between the standard gases and the response function used, the uncertainty due to the repeatability of the injections, and the propagated uncertainty related to the temporal consistency of the response function parameters (which also takes into account the covariance between the parameters). The mean value of the combined standard uncertainty decreased significantly after March 2009, from 2.37 nmol mol −1 to 1.66 nmol mol −1 , due to improvements in the measurement system. A fifth type of uncertainty we call representation uncertainty is considered when some of the data necessary to compute the temporal mean are absent. Any computed mean has also a propagated uncertainty arising from the uncertainties of the data used to compute the mean. The law of propagation depends on the type of uncertainty component (random or systematic). In situ hourly means are compared with simultaneous and collocated NOAA flask samples. The uncertainty of the differences is computed and used to determine whether the differences are significant. For 2009–2011, only 24.5% of the ... Article in Journal/Newspaper Northeast Atlantic Directory of Open Access Journals: DOAJ Articles Atmospheric Measurement Techniques 6 3 787 799 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
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Environmental engineering TA170-171 Earthwork. Foundations TA715-787 A. J. Gomez-Pelaez R. Ramos V. Gomez-Trueba P. C. Novelli R. Campo-Hernandez A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011 |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
Atmospheric CO in situ measurements are carried out at the Izaña (Tenerife) global GAW (Global Atmosphere Watch Programme of the World Meteorological Organization – WMO) mountain station using a Reduction Gas Analyser (RGA). In situ measurements at Izaña are representative of the subtropical Northeast Atlantic free troposphere, especially during nighttime. We present the measurement system configuration, the response function, the calibration scheme, the data processing, the Izaña 2008–2011 CO nocturnal time series, and the mean diurnal cycle by months. We have developed a rigorous uncertainty analysis for carbon monoxide measurements carried out at the Izaña station, which could be applied to other GAW stations. We determine the combined standard measurement uncertainty taking into consideration four contributing components: uncertainty of the WMO standard gases interpolated over the range of measurement, the uncertainty that takes into account the agreement between the standard gases and the response function used, the uncertainty due to the repeatability of the injections, and the propagated uncertainty related to the temporal consistency of the response function parameters (which also takes into account the covariance between the parameters). The mean value of the combined standard uncertainty decreased significantly after March 2009, from 2.37 nmol mol −1 to 1.66 nmol mol −1 , due to improvements in the measurement system. A fifth type of uncertainty we call representation uncertainty is considered when some of the data necessary to compute the temporal mean are absent. Any computed mean has also a propagated uncertainty arising from the uncertainties of the data used to compute the mean. The law of propagation depends on the type of uncertainty component (random or systematic). In situ hourly means are compared with simultaneous and collocated NOAA flask samples. The uncertainty of the differences is computed and used to determine whether the differences are significant. For 2009–2011, only 24.5% of the ... |
format |
Article in Journal/Newspaper |
author |
A. J. Gomez-Pelaez R. Ramos V. Gomez-Trueba P. C. Novelli R. Campo-Hernandez |
author_facet |
A. J. Gomez-Pelaez R. Ramos V. Gomez-Trueba P. C. Novelli R. Campo-Hernandez |
author_sort |
A. J. Gomez-Pelaez |
title |
A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011 |
title_short |
A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011 |
title_full |
A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011 |
title_fullStr |
A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011 |
title_full_unstemmed |
A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011 |
title_sort |
statistical approach to quantify uncertainty in carbon monoxide measurements at the izaña global gaw station: 2008–2011 |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/amt-6-787-2013 https://doaj.org/article/4311af2241dd4af785670f45e6e913f9 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Atmospheric Measurement Techniques, Vol 6, Iss 3, Pp 787-799 (2013) |
op_relation |
http://www.atmos-meas-tech.net/6/787/2013/amt-6-787-2013.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-6-787-2013 1867-1381 1867-8548 https://doaj.org/article/4311af2241dd4af785670f45e6e913f9 |
op_doi |
https://doi.org/10.5194/amt-6-787-2013 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
6 |
container_issue |
3 |
container_start_page |
787 |
op_container_end_page |
799 |
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1766143398291439616 |