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| Titel |
Design and airborne application of a tunable diode laser spectrometer for in-situ measurements of isotope ratios (δ¹⁸O, δD) in water |
| VerfasserIn |
Christoph Dyroff, Andreas Zahn, Daniel Fütterer |
| 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 |
250037331
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| Zusammenfassung |
| The measurement of isotope ratios in water vapor (H2O) can significantly enhance our
understanding of many crucial processes in which atmospheric water is involved. The
H2O-isotope ratios collect and conserve the H2O evaporation and condensation history prior
to sampling. They thus contain supplementary information on the hydrological
atmospheric cycle which H2O-concentration measurements cannot provide. Furthermore,
due to the considerable temperature-dependent isotope fractionation, H2O-isotope
ratios of cloud particles are a measure of the supersaturation present during cloud
formation.
While a number of satellite measurements have recently been realized [1–4], they only
provide a global picture. Airborne in-situ measurements — which can provide the often
necessary high spatial resolution — have very scarcely been performed, and only about four
instruments exist worldwide, one of which is the tunable diode-laser spectrometer ISOWAT
[5].
In this presentation we discuss the design and performance characteristics of our compact
and fully automated airborne spectrometer. ISOWAT will regularly (once per month) be
deployed aboard the CARIBIC passenger aircraft (Lufthansa A340-600) [6] as of spring
2010, and we examine the importance and potential of our measurements based on the first
in-flight data. Finally we give an outlook to further developments, which will even improve
the performance of this instrument.
Keywords: Water; Isotope Ratio; Laser Spectroscopy; Airborne Instrumentation
References
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2007.
[2] J. Steinwagner, M. Milz, T. von Clarmann, N. Glatthor, U. Grabowski, M. Höpfner,
G. P. Stiller, and T. Röckmann, Atmos. Chem. Phys. 7, 2601–2615, 2007.
[3] V. H. Payne, D. Noone, A. Dudhia, C. Piccolo, and R. G. Grainger, Q. J. R. Meteorol.
Soc. 133, 1459–1471, 2007.
[4] D. Brown, J. Worden, and D. Noone, J. Geophys. Res. 113, D15124, 2008.
[5] C. Dyroff, D. Fütterer, and A. Zahn, Appl. Phys. B 98, 537–548, 2010.
[6] C. A. M. Brenninkmeijer, P. Crutzen, et al., Atmos. Chem. Phys. 7, 4953–4976, 2007. |
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