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| Titel |
CO2 profile retrievals from TCCON spectra |
| VerfasserIn |
Susanne Dohe, Frank Hase, Eliezer Sepúlveda, Omaira Garciá, Debra Wunch, Paul Wennberg, Angel Gómez-Peláez, James B. Abshire, Steven C. Wofsy, Matthias Schneider, Thomas Blumenstock |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250099197
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| Publikation (Nr.) |
 EGU/EGU2014-14952.pdf |
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| Zusammenfassung |
| The Total Carbon Column Observing Network (TCCON) is a global network of
ground-based Fourier Transform Spectrometers recording direct solar spectra in the
near-infrared spectral region. With stringent requirements on the instrumentation, data
processing and calibration, accurate and precise column-averaged abundances of CO2, CH4,
N2O, HF, CO, H2O, and HDO are retrieved being an essential contribution for the validation
of satellite data (e.g. GOSAT, OCO-2) and carbon cycle research (Olsen and Randerson,
2004).
However, the determined column-averaged dry air mole fraction (DMF) contains no
information about the vertical CO2 profile, due to the use of a simple scaling retrieval within
the common TCCON analysis, where the fitting algorithm GFIT (e.g. Yang et al., 2005) is
used.
In this presentation we will apply a different procedure for calculating trace gas
abundances from the measured spectra, the fitting algorithm PROFFIT (Hase et. al., 2004)
which has been shown to be in very good accordance with GFIT. PROFFIT additionally
offers the ability to perform profile retrievals in which the pressure broadening effect of
absorption lines is used to retrieve vertical gas profiles, being of great interest especially for
the CO2 modelling community. A new analyzing procedure will be shown and retrieved
vertical CO2 profiles of the TCCON sites Izaña (Tenerife, Canary Islands, Spain) and
Lamont (Oklahoma, USA) will be presented and compared with simultaneously
performed surface in-situ measurements and CO2 profiles from different aircraft
campaigns.
References: - Hase, F. et al., J.Q.S.R.T. 87, 25-52, 2004.
- Olsen, S.C. and Randerson, J.T., J.G.Res., 109, D023012, 2004.
- Yang, Z. et al., J.Q.S.R.T., 90, 309-321, 2005. |
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