Validation of ACE and OSIRIS ozone and NO.sub.2 measurements using ground-based instruments at 80° N

The Optical Spectrograph and Infra-Red Imager System (OSIRIS) and the Atmospheric Chemistry Experiment (ACE) have been taking measurements from space since 2001 and 2003, respectively. This paper presents intercomparisons between ozone and NO.sub.2 measured by the ACE and OSIRIS satellite instrument...

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Published in:Atmospheric measurement techniques 2012-05, Vol.5 (5), p.927
Main Authors: Adams, C, Strong, K, Batchelor, R. L, Bernath, P. F, Brohede, S, Boone, C, Degenstein, D, Daffer, W. H, Drummond, J. R, Fogal, P. F, Farahani, E, Fayt, C, Fraser, A, Goutail, F, Hendrick, F, Kolonjari, F, Lindenmaier, R, Manney, G, McElroy, C. T, McLinden, C. A, Mendonca, J, Park, J.-H, Pavlovic, B, Pazmino, A, Roth, C, Savastiouk, V, Walker, K. A, Weaver, D, Zhao, X
Format: Article
Language:English
Subjects:
Air pollution
Analysis
Atmospheric chemistry
Atmospheric composition
Environmental aspects
Measurement
Measuring instruments
Middle atmosphere
Troposphere
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Summary:The Optical Spectrograph and Infra-Red Imager System (OSIRIS) and the Atmospheric Chemistry Experiment (ACE) have been taking measurements from space since 2001 and 2003, respectively. This paper presents intercomparisons between ozone and NO.sub.2 measured by the ACE and OSIRIS satellite instruments and by ground-based instruments at the Polar Environment Atmospheric Research Laboratory (PEARL), which is located at Eureka, Canada (80° N, 86° W) and is operated by the Canadian Network for the Detection of Atmospheric Change (CANDAC). The ground-based instruments included in this study are four zenith-sky differential optical absorption spectroscopy (DOAS) instruments, one Bruker Fourier transform infrared spectrometer (FTIR) and four Brewer spectrophotometers. Ozone total columns measured by the DOAS instruments were retrieved using new Network for the Detection of Atmospheric Composition Change (NDACC) guidelines and agree to within 3.2%. The DOAS ozone columns agree with the Brewer spectrophotometers with mean relative differences that are smaller than 1.5%. This suggests that for these instruments the new NDACC data guidelines were successful in producing a homogenous and accurate ozone dataset at 80° N. Satellite 14-52 km ozone and 17-40 km NO.sub.2 partial columns within 500 km of PEARL were calculated for ACE-FTS Version 2.2 (v2.2) plus updates, ACE-FTS v3.0, ACE-MAESTRO (Measurements of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation) v1.2 and OSIRIS SaskMART v5.0x ozone and Optimal Estimation v3.0 NO.sub.2 data products. The new ACE-FTS v3.0 and the validated ACE-FTS v2.2 partial columns are nearly identical, with mean relative differences of 0.0 ± 0.2% and -0.2 ± 0.1% for v2.2 minus v3.0 ozone and NO.sub.2, respectively. Ozone columns were constructed from 14-52 km satellite and 0-14 km ozonesonde partial columns and compared with the ground-based total column measurements. The satellite-plus-sonde measurements agree with the ground-based ozone total columns with mean relative differences of 0.1-7.3%. For NO.sub.2, partial columns from 17 km upward were scaled to noon using a photochemical model. Mean relative differences between OSIRIS, ACE-FTS and ground-based NO.sub.2 measurements do not exceed 20%. ACE-MAESTRO measures more NO.sub.2 than the other instruments, with mean relative differences of 25-52%. Seasonal variation in the differences between NO.sub.2 partial columns is observed, suggesting that there are
ISSN:1867-1381
1867-8548