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| Titel |
Four Fourier transform spectrometers and the Arctic polar vortex: instrument intercomparison and ACE-FTS validation at Eureka during the IPY springs of 2007 and 2008 |
| VerfasserIn |
R. L. Batchelor, F. Kolonjari, R. Lindenmaier, R. L. Mittermeier, W. Daffer, H. Fast, G. Manney, K. Strong, K. A. Walker |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 1 ; Nr. 3, no. 1 (2010-01-22), S.51-66 |
| Datensatznummer |
250000813
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| Publikation (Nr.) |
 copernicus.org/amt-3-51-2010.pdf |
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| Zusammenfassung |
| The Canadian Arctic Atmospheric Chemistry Experiment Validation Campaigns
have been carried out at Eureka, Nunavut (80.05° N, 86.42° W) during
the polar sunrise period since 2004. During the International Polar Year
(IPY) springs of 2007 and 2008, three ground-based Fourier transform
infrared (FTIR) spectrometers were operated simultaneously. This paper
presents a comparison of trace gas measurements of stratospherically
important species involved in ozone depletion, namely O3, HCl,
ClONO2, HNO3 and HF, recorded with these three spectrometers.
Total column densities of the gases measured with the new Canadian Network
for the Detection of Atmospheric Change (CANDAC) Bruker 125HR are shown to
agree to within 3.5% with the existing Environment Canada Bomem DA8
measurements. After smoothing both of these sets of measurements to account
for the lower spectral resolution of the University of Waterloo Portable
Atmospheric Research Interferometric Spectrometer for the Infrared
(PARIS-IR), the measurements were likewise shown to agree with PARIS-IR to
within 7%. Concurrent measurements of these gases were also made with the
satellite-based Atmospheric Chemistry Experiment Fourier Transform
Spectrometer (ACE-FTS) during overpasses of Eureka during these time
periods. While one of the mandates of the ACE satellite mission is to study
ozone depletion in the polar spring, previous validation exercises have
identified the highly variable polar vortex conditions of the spring period
to be a challenge for validation efforts. In this work, comparisons between
the CANDAC Bruker 125HR and ACE-FTS have been used to develop strict
criteria that allow the ground- and satellite-based instruments to be
confidently compared. When these criteria are taken into consideration, the
observed biases between the ACE-FTS and ground-based FTIR spectrometer are
not persistent for both years and are generally insignificant, though small
positive biases of ~5%, comparable in magnitude to those seen in
previous validation exercises, are observed for HCl and HF in 2007, and
negative biases of −15.3%, −4.8% and −1.5% are seen for
ClONO2, HNO3 and O3 in 2008. |
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