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Aircraft measurements of carbon dioxide and methane for the calibration of ground-based high-resolution Fourier Transform Spectrometers and a comparison to GOSAT data measured over Tsukuba and Moshiri
[摘要] Aircraft measurements of carbon dioxide and methane over Tsukuba(36.05° N, 140.12° E) (February 2010) and Moshiri(44.36° N, 142.26° E) (August 2009) were made to calibrateground-based high-resolution Fourier Transform Spectrometers (g-b FTSs) andto compare with the Greenhouse gases Observing SATellite (GOSAT). Theaircraft measurements over Tsukuba in February 2010 were successful insynchronizing with both the g-b FTS and GOSAT for the first time. Airborne in situ and flask-sampling instruments were mounted on the aircraft, andmeasurements were carried out between altitudes of 0.5 and 7 km to obtainvertical profiles of carbon dioxide (CO2), methane (CH4), and othergaseous species.

By comparing the g-b FTS measurements with the airborne measurements, thecolumn-averaged dry air mole fractions of CO2 (XCO2)and CH4 (XCH4) retrieved from the g-b FTS measurementsat Tsukuba were biased low by 0.33 ± 0.11% for XCO2 and 0.69 ± 0.29% for XCH4.

The g-b FTS values at Moshiri were biased low by 1.24% forXCO2 and 2.11% for XCH4. The GOSAT datashow biases that are 3.1% ± 1.7% lower for XCO2 and 2.5% ± 0.8% lower for XCH4 than the aircraftmeasurements obtained over Tsukuba.
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