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\begin{document}

\title{Drivers of the Mixed Layer Salinity Seasonal Variability in the Arctic
Ocean}



\author[1]{Alexandre Supply}%
\author[1]{Camille Lique}%
\author[2]{Nicolas Kolodziejczyk}%
\author[3]{Claude Talandier}%
\affil[1]{Laboratoire d'Océanographie Physique et Spatiale}%
\affil[2]{LOPS, University of Brest}%
\affil[3]{LPO, CNRS-IFREMER-IRD-UBO}%


\vspace{-1em}



  
  \date{June 07, 2024}


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\begin{abstract}
The processes driving the seasonal variability of the mixed layer
salinity in the Arctic Ocean are investigated using a simulation
performed with regional ocean -- sea ice model at high resolution. While
the seasonal variations of the mixed layer depth remain small, in
particular under the perennial sea ice (O(30m)), the mean salinity of
the mixed layer varies largely, with a seasonal cycle as high as 3 pss.
On the shelves, where the sea ice is seasonal, the mixed layer is much
fresher but exhibits a seasonal cycle with a similar amplitude. Overall,
the seasonal variability of the mixed layer salinity results largely
from a 1D vertical balance between the freshwater flux at the surface
arising from the sea ice melt and freezing processes, and vertical
mixing and entrainment occurring at the base of the mixed layer. The
largest variations are found in summer, when the mixed layer is the
thinnest. Over the shelves, this simple 1D balance is complexified due
to the role of advection and river runoff that can locally affect the
mixed layer depth and salinity. Interestingly, the largest variations
are found less than 100km on each side of the sea ice edge, where all
the processes affecting the mixed layer are amplified. This suggests the
need to better observed and understand the ocean-sea ice-atmosphere
exchanges in these regions.%
\end{abstract}%



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