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

Authors

Lauwers,  Thomas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fourré,  Elise
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jacob,  Roxanne
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ollivier,  Inès
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jossoud,  Olivier
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Prié,  Frédéric
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Romanini,  Daniele
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Casado,  Mathieu
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Masson-Delmotte,  Valérie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Landais,  Amaëlle
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Lauwers, T., Fourré, E., Jacob, R., Ollivier, I., Jossoud, O., Prié, F., Romanini, D., Casado, M., Masson-Delmotte, V., Landais, A. (2023): New developments in laser spectroscopy for water vapor isotopic measurement along the Dumont-d’Urville – Dome C transect, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3865


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020680
Abstract
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 enhanced absorption spectroscopy (OF-CEAS) technique offers an interesting alternative for low humidity detection. During the austral summer 2022 – 2023, two OF-CEAS spectrometers were respectively installed at Dumont-d’Urville, situated along the coast, and Dome C, situated on the plateau, at 3230 m above sea level. We present here results obtained with this OF-CEAS technique, which shows an improved limit of detection, while keeping a low humidity dependence.This work is part of the AWACA ERC project, in which we intend to install several OF-CEAS instruments, in three remote sites situated along the Dumont-d’Urville – Dome C transect, in addition to the two permanent polar stations.