<h2>Improvement of the Arctic Ocean Modeling with Appropriate Representation
      of Mesoscale Processes</h2>
<p > <strong>Researcher:</strong> Eiji Watanabe<br />
        <strong>Funding Source:</strong> JAMSTEC JFY2008<br />
        <strong>Collaborators:</strong> Igor Polyakov (IARC/UAF), Vladimir Alexeev (IARC/UAF), Hiroyasu
      Hasumi (Univ. of Tokyo), Greg Holloway (IOS/Canada)</p>
      <p > We will proceed to the model improvement on the Pacific water pathway and ocean stratification
        in the Arctic Ocean by using a sophisticated parameterization for the shelf-to-basin transport
        associated with mesoscale eddy activities. </p>
      <p > In order to represent the eddy-induced shelf-to-basin transport of the Pacific water across
        the Beaufort shelfbreak indirectly, a modified Gent and McWilliams diffusion scheme is incorporated
        into a coupled sea ice-ocean model whose resolution is coarser than an eddy-resolving one. In
        this scheme, a coefficient of isopycnal layer thickness diffusion temporarily and spatially varies
        depending on local baroclinicity, so that the warm and fresh Pacific water is properly involved
        into the Canadian Basin. Then, the simulated major properties (e.g., circulation, temperature,
        and salinity) are compared with observational estimates (e.g., produced by Greg Holloway at IOS)
        and various results of other Arctic Ocean models (including AOMIP models).</p>
      <p > The parameterized eddy-induced transport of the Pacific water into the Canadian Basin is locally
        promoted by reflecting strong baroclinicity along the Beaufort shelfbreak. This improvement will
        remarkably reduce a significant salinity bias in the upper Canadian Basin shown in most previous
        Arctic Ocean models.</p>
      <p > This study will propose that an appropriate representation of mesoscale activities, such as
        the eddy-induced shelf-to-basin transport, is essentially important for further progress in the
        Arctic Ocean modeling. The comparison of simulated and observed circulation fields assists to
        choose mooring location of current meters.</p>