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| Titel |
Remote sensing of XCO2 and XCH4 above the Atlantic from aboard the research vessel Polarstern |
| VerfasserIn |
Friedrich Klappenbach, Julian Kostinek, Marco Bertleff, Frank Hase, André Butz |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250111658
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| Publikation (Nr.) |
 EGU/EGU2015-11798.pdf |
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| Zusammenfassung |
| Global measurements of the column average dry air mole fractions of carbon dioxide (XCO2)
and methane (XCH4) are of great interest for inferring information on sources and sinks of
these two major anthropogenic greenhouse gases. Satellite remote sensing of XCO2 and
XCH4 is an emerging tool which promises to supplement the traditional ground-based in-situ
sampling approach by vast data coverage. The usefulness of XCO2 and XCH4 measured by
satellites such as GOSAT and OCO-2, however, crucially depends on precision and accuracy.
Therefore, validation by ground-based remote sensing observations is of major
importance.
The Total Carbon Column Observing Network (TCCON) has been designed to meet these
validation needs. It covers a few tens of ground-based Fourier Transform Spectrometers
operating at very high spectral resolution. Most of these instruments are located on
continental regions especially in the northern hemisphere. However, oceanic regions are
sparsely validated.
In the framework of the development of a robust, small and versatile spectrometer for
harsh environments and mobile applications, we operated two instruments, a Fourier
Transform Spectrometer (EM27/SUN by Bruker) and a custom-built grating spectrometer
aboard the German research vessel Polarstern. Both instruments are modified such, that the
solar tracking system can compensate for the ships movement.
Here, we will present and discuss instrument performance of the EM27/SUN instrument
and the solar tracking device. The retrieved north to south gradient of XCO2 and XCH4
mixing ratios along the ship track from Capetown (SA) to Bremerhaven (GER) during the
5-week cruise in March 2014 will be presented and discussed. We assess the usefulness of the
dataset for validating GOSAT ocean glint observations as well as an comparison with the
global CO2 and CH4 model data. |
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