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- Title
Calibration of TCCON column-averaged CO<sub>2</sub>: the first aircraft campaign over European TCCON sites.
- Authors
Messerschmidt, J.; Geibel, M. C.; Blumenstock, T.; Chen, H.; Deutscher, N. M.; Engel, A.; Feist, D. G.; Gerbig, C.; Gisi, M.; Hase, F.; Katrynski, K.; Kolle, O.; Lavrič, J. V.; Notholt, J.; Palm, M.; Ramonet, M.; Rettinger, M.; Schmidt, M.; Sussmann, R.; Toon, G. C.
- Abstract
The Total Carbon Column Observing Network (TCCON) is a ground-based network of Fourier Transform Spectrometer (FTS) sites around the globe, where the column abundances of CO2, CH4, N2O, CO and O2 are measured. CO2 is constrained with a precision better than 0.25% (1-σ). To achieve a similarly high accuracy, calibration to World Meteorological Organization (WMO) standards is required. This paper introduces the first aircraft calibration campaign of five European TCCON sites and a mobile FTS instrument. A series of WMO standards in-situ profiles were obtained over European TCCON sites via aircraft and compared with retrievals of CO2 column amounts from the TCCON instruments. The results of the campaign show that the FTS measurements are consistently biased 1.1%±0.2% low with respect to WMO standards, in agreement with previous TCCON calibration campaigns. The standard a priori profile for the TCCON FTS retrievals is shown to not add a bias. The same calibration factor is generated using aircraft pro- files as a priori and with the TCCON standard a priori. With a calibration to WMO standards, the highly precise TCCON CO2 measurements of total column concentrations provide a suitable database for the calibration and validation of nadir-viewing satellites.
- Subjects
ATMOSPHERIC carbon dioxide; AIRPLANES; SCIENTIFIC observation; COMPARATIVE studies; WORLD Meteorological Organization; FOURIER transform spectroscopy; ARTIFICIAL satellites
- Publication
Atmospheric Chemistry & Physics, 2011, Vol 11, Issue 21, p10765
- ISSN
1680-7316
- Publication type
Article
- DOI
10.5194/acp-11-10765-2011