New developments in laser spectroscopy for water vapor isotopic measurement along the Dumont-d’Urville – Dome C transect ...

• Main Authors: Lauwers, Thomas, Fourré, Elise, Jacob, Roxanne, Ollivier, Inès, Jossoud, Olivier, Prié, Frédéric, Romanini, Daniele, Casado, Mathieu, Masson-Delmotte, Valérie, Landais, Amaëlle
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Antarctic; Dumont d’Urville; East Antarctica; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.57757/iugg23-3865; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020680

<!--!introduction!--> Water isotopes measurements in polar ice cores are key to reconstruct past climatic variations. However, the relationship between surface temperature and water isotopic composition is not straightforward because snow isotopic composition is influenced by many factors in addition to local temperature of condensation (evaporation origin, trajectory of moist air, post deposition effects). In order to refine this interpretation, parallel observation of water vapor and surface snow isotopic composition in polar regions is essential. Measuring atmospheric water isotopic composition is however an important challenge, especially in dry places like the East Antarctic plateau, where water mixing ratio can be as low as 10 ppmv. Laser spectrometers based on the cavity ring-down spectroscopy (CRDS), commonly used for field measurement, fail to precisely measure water vapor isotopic composition for the lower range of water mixing ratios recorded in East Antarctica. The optical feedback cavity ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...