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| Titel |
Variability of the vertical stable water isotope composition from airborne measurements in the western Mediterranean in October 2012 |
| VerfasserIn |
Harald Sodemann, Franziska Aemisegger, Stephan Pfahl, Ulrich Corsmeier, Andreas Wieser, Mark Bitter, Thomas Feuerle, Rudolf Hankers, Helmut Schulz, Gregor Hsiao, Heini Wernli |
| 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 |
250095035
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| Publikation (Nr.) |
 EGU/EGU2014-10475.pdf |
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| Zusammenfassung |
| Stable water isotopes are useful indicators of meteorological processes on a broad range of
scales, reflecting for example evaporation, precipitation and airmass mixing processes. Here
we present a detailed analysis of the first set of airborne spectroscopic stable water
isotopes measurements in the western Mediterranean. Measurements have been
acquired by a customised Picarro L2130i instrument with enhanced data acquisition
rate by a dual-laser system. The instrument was deployed in cooperation with the
Karlsruhe Institute of Technology (KIT) onboard the Dornier 128-6 research aircraft
D-IBUF of the Institute of Flight Guidance, TU Braunschweig together with a
meteorological flux measurement package during an international field campaign within the
framework of HYMEX (Hydrological Cycle in Mediterranean Experiment) in Corsica,
France.
Vertical profiles of δD and δ18O show strong variability between flights depending on the
prevailing meteorological situation, and in the vertical during individual flights.
The principal factors influencing the vertical variability are shown to be advection
and the temperature structure of the marine boundary layer. In particular, strong
inversions at the top of the marine boundary layer can at times lead to step-like
changes in δD exceeding 100 permil within 100 meters in the vertical. The isotopic
information of the sampled water vapour is generally consistent with indicators of
moisture source age and distance obtained from a Lagrangian method. Finally, the
significance of the observed temporal and vertical variability for the representation of the
atmospheric isotope composition in GCMs and remote-sensing retrievals are discussed. |
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