Details

Autor(en) / Beteiligte

• Hedelius, Jacob K
• Parker, Harrison
• Wunch, Debra
• Roehl, Coleen M
• Viatte, Camille
• Newman, Sally
• Toon, Geoffrey C
• Podolske, James R
• Hillyard, Patrick W
• Iraci, Laura T
• Dubey, Manvendra K
• Wennberg, Paul O

Titel

Intercomparability of XCO2 and XCH4 from the United States TCCON sites

Ist Teil von

• Atmospheric measurement techniques, 2017-04, Vol.10 (4), p.1481-1493

Ort / Verlag

Katlenburg-Lindau: Copernicus GmbH

Erscheinungsjahr

2017

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The Total Carbon Column Observing Network (TCCON) has become the standard for long-term column-averaged measurements of CO2 and CH4. Here, we use a pair of portable spectrometers to test for intra-network bias among the four currently operating TCCON sites in the United States (US). A previous analytical error analysis has suggested that the maximum 2σ site-to-site relative (absolute) bias of TCCON should be less than 0.2 % (0.8 ppm) in XCO2 and 0.4 % (7 ppb) in XCH4. We find here experimentally that the 95 % confidence intervals for maximum pairwise site-to-site bias among the four US TCCON sites are 0.05–0.14 % for XCO2 and 0.08–0.24 % for XCH4. This is close to the limit of the bias we can detect using this methodology.