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Conference Paper

Towards an understanding of the controls on δO2/N2 variability in ice core records

Authors

Harris Stuart,  Romilly
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;

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

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

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

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

Grisart,  Antoine
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;

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

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

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Citation

Harris Stuart, R., Landais, A., Martinerie, P., Dumont, M., Libois, Q., Orsi, A., Grisart, A., Prié, F., Buizert, C., Severinghaus, J. (2023): Towards an understanding of the controls on δO2/N2 variability in ice core records, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4430


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021860
Abstract
Processes controlling pore closure are broadly understood yet defining the physical mechanisms driving elemental fractionation remains ambiguous. It has indeed been shown that the pore closure processes lead to a decrease of concentration of small size molecules (e.g. O2, Ar, Ne) in the bubbles. Moreover, ice core δO2/N2 records shows a clear link with local summer solstice insolation and hence makes it a powerful dating tool. However, investigations towards a mechanistic understanding of δO2/N2 and summer solstice insolation suggests local climatic conditions may also be important. We compiled δO2/N2records from several polar ice cores and found a link between δO2/N2 and temperature and/or accumulation rate, in addition to the influence of the summer solstice insolation intensity. Using the Crocus snowpack model, we carry out sensitivity tests to identify the response of near-surface snow properties to changes in insolation, accumulation rate and air temperature.