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| Titel |
Validation of XCO2 derived from SWIR spectra of GOSAT TANSO-FTS with aircraft measurement data |
| VerfasserIn |
M. Inoue, I. Morino, O. Uchino, Y. Miyamoto, Y. Yoshida, T. Yokota, T. Machida, Y. Sawa, H. Matsueda, C. Sweeney, P. P. Tans, A. E. Andrews, S. C. Biraud, T. Tanaka, S. Kawakami, P. K. Patra |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 19 ; Nr. 13, no. 19 (2013-10-02), S.9771-9788 |
| Datensatznummer |
250085730
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| Publikation (Nr.) |
 copernicus.org/acp-13-9771-2013.pdf |
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| Zusammenfassung |
Column-averaged dry air mole fractions of carbon dioxide (XCO2)
retrieved from Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength
InfraRed (SWIR) observations were validated with aircraft measurements by
the Comprehensive Observation Network for TRace gases by AIrLiner (CONTRAIL)
project, the National Oceanic and Atmospheric Administration (NOAA), the US
Department of Energy (DOE), the National Institute for Environmental Studies
(NIES), the HIAPER Pole-to-Pole Observations (HIPPO) program, and the
GOSAT validation aircraft observation campaign over Japan. To calculate
XCO2 based on aircraft measurements (aircraft-based XCO2), tower
measurements and model outputs were used for additional information near the
surface and above the tropopause, respectively. Before validation, we
investigated the impacts of GOSAT SWIR column averaging kernels (CAKs) and
the shape of a priori profiles on the aircraft-based XCO2 calculation.
The differences between aircraft-based XCO2 with and without the
application of GOSAT CAK were evaluated to be less than ±0.4 ppm at
most, and less than ±0.1 ppm on average. Therefore, we concluded that
the GOSAT CAK produces only a minor effect on the aircraft-based XCO2
calculation in terms of the overall uncertainty of GOSAT XCO2.
We compared GOSAT data retrieved within ±2 or ±5°
latitude/longitude boxes centered at each aircraft measurement site to
aircraft-based data measured on a GOSAT overpass day. The results indicated
that GOSAT XCO2 over land regions agreed with aircraft-based XCO2,
except that the former is biased by −0.68 ppm (−0.99 ppm) with a standard
deviation of 2.56 ppm (2.51 ppm), whereas the averages of the differences
between the GOSAT XCO2 over ocean and the aircraft-based XCO2 were
−1.82 ppm (−2.27 ppm) with a standard deviation of 1.04 ppm (1.79 ppm) for
±2° (±5°) boxes. |
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