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| Titel |
Validation of GOSAT methane by ground-based MIR- and NIR FTS at the Ground-Truthing Facility Garmisch/Zugspitze |
| VerfasserIn |
Ralf Sussmann, Markus Rettinger, Frank Forster, Tobias Borsdorff |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035418
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| Zusammenfassung |
| Continuous ground-based measurements are performed correlative to GOSAT overpasses in the near infrared (NIR) and mid-infrared (MIR) with the TCCON FTS at Garmisch (47.48 °N, 11.06 °E, 745 m a.s.l., NIR and MIR) and the nearby NDACC FTS at Zugspitze (47.4 °N, 11.0 °E, 2964 m a.s.l., MIR).
These data are used in this study to quantify potential biases and temporal drifts of GOSAT level-2 data on column-averaged methane. A focus is on investigation of time dependent biases which arise from airmass-dependent artifacts and impact XCH4 annual cycles on the 1 % level - which is comparable to the amplitude of the seasonal cycle for clean air sites. Therefore, the coincident ground-based MIR and NIR FTS operation is a key to assess residual airmass-dependent artifacts on the way to reach error levels significantly below 1 %. The ground-based FTS set up is described and first preliminary results are shown.
Acknowledgment
This work is a contribution to the JAXA-NIES GOSAT-RA-Project “Validation of GOSAT methane, carbon dioxide, and water vapor at the Ground-Truthing Facility Garmisch/Zugspitze”. Travel funding by JAXA and NIES is gratefully acknowledged. |
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