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

Type Article
Acceptance Date 2022-08-24 IN PRESS
Language English
Author(s) Hayatte Akhoudas Camille1, 2, Sallée Jean-Baptiste3, Reverdin Gilles3, Haumann Alexander F.ORCID4, Pauthenet EtienneORCID5, Chapman ChristopherORCID6, Margirier Félix7, Lo Monaco Claire, Metzl Nicolas3, Meilland JulieORCID3, Stranne ChristianORCID1, 2, 8
Affiliation(s) 1 : Department of Geological Sciences, Stockholm University, Stockholm, Sweden
2 : Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
3 : CNRS/IRD/MNHN, LOCEAN, Sorbonne Universite´ , Paris, France
4 : Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, United States
5 : LOPS, IFREMER, Plouzane´ , France
6 : CSIRO, Hobart, Tasmania
7 : School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, United States
8 : MARUM, University of Bremen, Bremen, Germany
Source Under review Natureportfolio (Research Square Platform LLC) In Press
DOI 10.21203/rs.3.rs-1952513/v1
Note This is a preprint ; it has not been reviewed by a journal
Abstract

The hydrological cycle is expected to intensify in a warming climate. However, observational evidence of such changes in the Southern Ocean is difficult to obtain due to sparse measurements and a complex superposition of changes in precipitation, sea ice, and glacial meltwater. We here disentangle these signals using a unique dataset of salinity and seawater oxygen isotope observations collected in the Indian sector of the Southern Ocean. Our results show that the atmospheric water cycle has intensified in this region between 1993 and 2021, increasing the salinity in subtropical surface waters by 0.07 g kg-1 per decade, and decreasing it in subpolar surface waters by -0.028 g kg-1 per decade. In the subpolar region, this salinity decrease is countered by a salinity increase of 0.008 g kg-1 per decade from reduced sea ice melt, and enhanced by a salinity decrease of -0.005 g kg-1 per decade from increased glacial melt. These changes extend the growing evidence for an acceleration of the atmospheric water cycle and a melting cryosphere that can be expected from global warming.

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Hayatte Akhoudas Camille, Sallée Jean-Baptiste, Reverdin Gilles, Haumann Alexander F., Pauthenet Etienne, Chapman Christopher, Margirier Félix, Lo Monaco Claire, Metzl Nicolas, Meilland Julie, Stranne Christian Isotopic evidence for an intensified hydrological cycle in the Indian sector of the Southern Ocean. Under review Natureportfolio IN PRESS. Publisher's official version : https://doi.org/10.21203/rs.3.rs-1952513/v1 , Open Access version : https://archimer.ifremer.fr/doc/00789/90144/