The Southern Ocean freezes to the surface but deepens

Scientist from the French Antarctic ship L’Astrolabe launches XBT probe to measure ocean temperature at a depth of 800 meters. Loan: © Sebastien Chastenet / OMP / IPEV

CNRS, CNES, IRD, Sorbonne Université, l’Université Toulouse III – Paul Sabatier և their Australian counterparts * Scientists with IPEV support have provided a comprehensive analysis of the evolution of the Southern Ocean temperature over the last 25 years. The research team concluded that the slight cooling on the surface hides the rapid, significant warming of the water to a depth of 800 m.

The study points to major changes around the polar ice cap, where temperatures rise by 0.04 ° C over a decade, which could have serious repercussions on Antarctic ice. Hot water is also rising rapidly to the surface at a rate of ten decades, three to ten times higher than previously estimated.

Published: Nature communications On January 21, 2021, these results were obtained through unique data obtained over the last 25 years on the French Antarctic refueling ship L’Astrolabe. This is the longest series of records in the South Ocean, covering from north to south.

* The laboratories and facilities involved in this study are oceanographic and climate laboratories. Experiments և Digital Approaches (CNRS / IRD / MNHN / Sorbonne Université), part of the Pierre-Simon Laplace Institute. Space Geophysics and Oceanography Research Laboratory (CNRS / CNES / IRD / Université Toulouse III – Paul Sabatier) ագործ Organization for Scientific and Industrial Research Cooperation (CSIRO; Australia). The SURVOSTRAL monitoring program was funded by IPEV և CNRS.

Reference. Authors: “Temperature Trends in the 25-Year Situation in the South Ocean from Intermediate Variability” by Matthias Oger, Rosemary Moro, Elodie Castenare, Baptiste Salle և Rebecca Cowliner, January 21, 2021 Nature communications,
DOI: 10.1038 / s41467-020-20781-1:

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