Earth Sciences

Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean

C. H. Akhoudas, J. Sallée, et al.

Discover the intriguing dynamics of the atmospheric water cycle intensifying in the Southern Ocean, as revealed by a comprehensive study from 1993 to 2021. This research, conducted by Camille Hayatte Akhoudas and colleagues, uncovers significant changes in salinity driven by global warming, including a dramatic increase in net precipitation and altered sea ice dynamics.

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Abstract

This study investigates the intensification of the atmospheric water cycle in the Indian sector of the Southern Ocean between 1993 and 2021 using salinity and seawater oxygen isotope observations. Results show an increase in salinity in subtropical surface waters (0.06 ± 0.07 g kg⁻¹ per decade) and a decrease in salinity in subpolar surface waters (-0.02 ± 0.01 g kg⁻¹ per decade). Oxygen isotope data reveals that subpolar freshening is primarily driven by increased net precipitation (doubling), while decreased sea ice melt is balanced by glacial meltwater. These findings support the growing evidence for an accelerated hydrological cycle and melting cryosphere due to global warming.

Publisher

Nature Communications

Published On

May 13, 2023

Authors

Camille Hayatte Akhoudas, Jean-Baptiste Sallée, Gilles Reverdin, F. Alexander Haumann, Etienne Pauthenet, Christopher C. Chapman, Félix Margirier, Claire Lo Monaco, Nicolas Metzl, Julie Meilland, Christian Stranne

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