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A Statistical Approach to Quantify Uncertainty in Carbon Monoxide Measurements at the Izaña Global Gaw Station: 2008–2011 : Volume 6, Issue 3 (20/03/2013)

By Gomez-pelaez, A. J.

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Book Id: WPLBN0003999301
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: A Statistical Approach to Quantify Uncertainty in Carbon Monoxide Measurements at the Izaña Global Gaw Station: 2008–2011 : Volume 6, Issue 3 (20/03/2013)  
Author: Gomez-pelaez, A. J.
Volume: Vol. 6, Issue 3
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2013
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Gomez-Pelaez, A. J., Novelli, P. C., Campo-Hernandez, R., Ramos, R., & Gomez-Trueba, V. (2013). A Statistical Approach to Quantify Uncertainty in Carbon Monoxide Measurements at the Izaña Global Gaw Station: 2008–2011 : Volume 6, Issue 3 (20/03/2013). Retrieved from http://hawaiilibrary.net/


Description
Description: Izaña Atmospheric Research Center (IARC), Meteorological State Agency of Spain (AEMET), Izaña, 38311, Spain. 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 differences are significant, and 68% of the differences are between −2.39 and 2.5 nmol mol−1. Total and annual mean differences are computed using conventional expressions but also expressions with weights based on the minimum variance method. The annual mean differences for 2009–2011 are well within the ±2 nmol mol−1 compatibility goal of GAW.


Summary
A statistical approach to quantify uncertainty in carbon monoxide measurements at the Izaña global GAW station: 2008–2011

Excerpt
Armerding, W., Comes, F. J., Crawack, H. J., Forberich, O., Gold, G., Ruger, C., Spiekermann, M., Walter, J., Cuevas, E., Redondas, A., Schmitt, R., and Matuska, P.: Testing the daytime oxidizing capacity of the troposphere: 1994 OH field campaign at the Iza{ñ}a observatory, Tenerife, J. Geophys. Res., 102, 10603–10611, doi:10.1029/96JD03714, 1997.; Conway, T. J., Tans, P., Waterman, L. S., Thoning, K. W., Masarie, K. A., and Gammon, R. H.: Atmospheric carbon dioxide measurements in the remote global troposphere, 1981–1984, Tellus B, 40, 81–115, doi:10.1111/j.1600-0889.1988.tb00214.x, 1988.; Ehhalt, D., Prather, M., Dentener, F., Derwent, R., Dlugokencky, E., Holland, E., Isaksen, I., Katima, J., Kirchhoff, V., Matson, P., Midgley, P., and Wang, M.: Atmospheric chemistry and greenhouse gases, Chapter 4, in: Climate Change 2001: The Scientific Basis, edited by: Houghton, J. T., Ding, Y., Griggs, D. J., Noguer, M., van der Linden, P. J., Dai, X., Maskell, K., and Johnson, C. A., Cambridge University Press, Cambridge, UK, 239–287, 2001.; Fischer, H., Nikitas, C., Parchatka, U., Zenker, T., Harris, G. W., Matuska, P., Schmitt, R., Mihelcic, D., Muesgen, P., Paetz, H.-W., Schultz, M., and Volz-Thomas, A.: Trace gas measurements during the oxidizing Capacity of the Tropospheric Atmosphere campaign 1993 at Iza{ñ}a, J. Geophys. Res., 103, 13505–13518, doi:10.1029/97JD01497, 1998.; JCGM: JCGM 100:2008, GUM 1995 with Minor Corrections, Evaluation of Measurement Data – guide to the Expression of Uncertainty in Measurement, Joint Committee for Guides in Metrology, Member organizations: BIPM, IEC, IFCC, ILAC, ISO, IUPAC, IUPAP, and OIML, 2008.; Kitzis, D.: Preparation and stability of standard reference air mixtures, Tech. rep., NOAA Earth System Research Laboratory, Boulder, USA, available at: http://www.esrl.noaa.gov/gmd/ccl/airstandard.html (last access: 14 September 2012), 2009.; Komhyr, W. D., Gammon, R. H., Harris, T. B., Waterman, L. S., Conway, T. J., Taylor, W. R., and Thoning, K. W.: Global atmospheric CO2 distribution and variations from 1968–1982 NOAA/GMCC CO2 flask sample data, J. Geophys. Res., 90, 5567–5596, doi:10.1029/JD090iD03p05567, 1985.; Lang, P. M.: Guidelines for standard gas cylinder and pressure regulator use, Tech. rep., NOAA Earth System Research Laboratory, Boulder, USA, available at: http://www.esrl.noaa.gov/gmd/ccl/reg.guide.html (last access: 14 September 2012), 1998.; Logan, J. A., Prather, M. J., Wofsy, S. C., and McElroy, M. B.: Tropospheric chemistry – a global perspective, J. Geophys. Res., 86, 7210–7254, doi:10.1029/JC086iC08p07210, 1981.; Martin, B. R.: Statistics for Physicists, Academic Press, London, UK, 1971.; Navascues, B. and Rus, C.: Carbon dioxide observations at Izana baseline station, Tenerife (Canary Islands) – 1984–1988, Tellus&nb

 

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