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Evaluation of MOPITT Version 7 joint TIR-NIR XCO retrievals with TCCON

Hedelius, J. K.; He, T.-L.; Jones, D. B. A.; Baier, B. C.; Buchholz, R. R.; De Mazière, M.; Deutscher, N. M.; Dubey, M. K.; Feist, D. G.; Griffith, D. W. T.; Hase, F.; Iraci, L. T.; Jeseck, P.; Kiel, M.; Kivi, R.; Liu, C.; Morino, I.; Notholt, J.; Oh, Y.-S.; Ohyama, H.; ... mehr

Abstract (englisch):
Observations of carbon monoxide (CO) from the Measurements Of Pollution In The Troposphere (MOPITT) instrument aboard the Terra spacecraft were expected to have an accuracy of 10 % prior to the launch in 1999. Here we evaluate MOPITT Version 7 joint (V7J) thermal-infrared and near-infrared (TIR–NIR) retrieval accuracy and precision and suggest ways to further improve the accuracy of the observations. We take five steps involving filtering or bias corrections to reduce scatter and bias in the data relative to other MOPITT soundings and ground-based measurements. (1) We apply a preliminary filtering scheme in which measurements over snow and ice are removed. (2) We find a systematic pairwise bias among the four MOPITT along-track detectors (pixels) on the order of 3–4 ppb with a small temporal trend, which we remove on a global scale using a temporally trended bias correction. (3) Using a small-region approximation (SRA), a new filtering scheme is developed and applied based on additional quality indicators such as the signal-to-noise ratio (SNR). After applying these new filters, the root-mean-squared error computed using the local median from the SRA over 16 years of global observations decreases from 3.84 to 2.55 ppb. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000099612
Veröffentlicht am 06.11.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1867-1381, 1867-8548
KITopen-ID: 1000099612
Erschienen in Atmospheric measurement techniques
Band 12
Heft 10
Seiten 5547-5572
Vorab online veröffentlicht am 21.10.2019
Nachgewiesen in Web of Science
Scopus
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