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| Titel |
Continuous water isotope measurements during evaporation processes in the Atlantic realm |
| VerfasserIn |
Jean-Louis Bonne, Martin Werner, Hanno Meyer, Sepp Kipfstuhl, Benjamin Rabe, Melanie Behrens, Lutz Schönicke, Hans Christian Steen Larsen |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149253
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| Publikation (Nr.) |
 EGU/EGU2017-13586.pdf |
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| Zusammenfassung |
| Since July 2015, water stable isotopes (HDO and H218O) have been continuously measured
on board of the research vessel Polarstern, both in atmospheric vapour at 30 meters
height and on a daily basis in surface ocean water samples. Until now, the dataset
covers two Arctic seasons in summer 2015 and 2016 including measurements up to
the North Pole, one Antarctica season from December 2015 to April 2016 and
two Atlantic transits crossing the equator in November 2015 and April 2016. This
global coverage of observations allows us to evaluate the isotopic composition
of moisture evaporated from Atlantic surface waters in a broad range of climatic
regimes.
Combining liquid and vapour isotopic measurements allows testing the validity of the
often used closure assumption, which assumes the equality between the boundary layer
vapour isotopic composition and the isotopic composition of the evaporative flux, over a
broad latitudinal region.
Furthermore, our isotope measurements at the source of evaporation enable us to
investigate the influence of local meteorological parameters, such as relative humidity at the
sea surface, sea surface temperature and wind speed, on the deuterium excess signal of the
near-surface moisture. |
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