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Title: Robust extraction of baseline signal of atmospheric trace species using local regression
Authors : Ruckstuhl, Andreas
Henne, Stephan
Reimann, Stefan
Steinbacher, Martin
Vollmer, Martin K.
O’Doherty, Simon
Buchmann, Brigitte
Hueglin, Christoph
Published in : Atmospheric Measurement Techniques
Volume(Issue) : 5
Issue : 11
Pages : 2613
Pages to: 2624
Publisher / Ed. Institution : Copernicus
Issue Date: 2-Nov-2012
License (according to publishing contract) : CC BY 3.0: Namensnennung 3.0 Unported
Type of review: Peer review (Publication)
Language : English
Subjects : Robust fitting; Air quality; Data analysis
Subject (DDC) : 500: Natural sciences and mathematics
Abstract: The identification of atmospheric trace species measurements that are representative of well-mixed background air masses is required for monitoring atmospheric composition change at background sites. We present a statistical method based on robust local regression that is well suited for the selection of background measurements and the estimation of associated baseline curves. The bootstrap technique is applied to calculate the uncertainty in the resulting baseline curve. The non-parametric nature of the proposed approach makes it more flexible than other commonly used statistical data filtering methods. Application to carbon monoxide (CO) measured from 1996 to 2009 at the high-alpine site Jungfraujoch (Switzerland, 3580m asl.), and to measurements of 1,1-difluoroethane (HFC-152a) from Jungfraujoch (2000 to 2009) and Mace Head (Ireland, 1995 to 2009) demonstrates the feasibility and usefulness of the proposed approach. The determined average annual change of CO at Jungfraujoch for the 1996 to 2009 period as estimated from filtered annual mean CO concentrations is -2.2 1.1 ppb/yr. For comparison, the linear trend of unfiltered CO measurements at Jungfraujoch for this time period is -2.9 1.3 ppb/yr.
Departement: School of Engineering
Publication type: Article in scientific Journal
DOI : 10.5194/amt-5-2613-2012
ISSN: 1867-1381
Appears in Collections:Publikationen School of Engineering

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