We derive and apply a methodology for the initialization of velocity and\r\ntransport fields in complex multiply-connected regions with multiscale\r\ndynamics. The result is initial fields that are consistent with observations,\r\ncomplex geometry and dynamics, and that can simulate the evolution of ocean\r\nprocesses without large spurious initial transients. A class of constrained\r\nweighted least squares optimizations is defined to best fit first-guess\r\nvelocities while satisfying the complex bathymetry, coastline and divergence\r\nstrong constraints. A weak constraint towards the minimum inter-island transports that\r\nare in accord with the first-guess velocities provides important velocity corrections\r\nin complex archipelagos. In the optimization weights, the minimum distance\r\nand vertical area between pairs of coasts are computed using a Fast Marching\r\nMethod. Additional information on velocity and transports are included as\r\nstrong or weak constraints. We apply our methodology around the Hawaiian\r\nislands of Kauai\/Niihau, in the Taiwan\/Kuroshio region and in the Philippines\r\nArchipelago. Comparisons with other common initialization strategies, among\r\nhindcasts from these initial conditions (ICs), and with independent in situ\r\nobservations show that our optimization corrects transports, satisfies boundary\r\nconditions and redirects currents. Differences between the hindcasts from\r\nthese different ICs are found to grow for at least 2-3 weeks. When compared\r\nto independent in situ observations, simulations from our optimized ICs are\r\nshown to have the smallest errors.<\/p>","protected":false},"excerpt":{"rendered":"
We derive and apply a methodology for the initialization of velocity and transport fields in complex multiply-connected regions with multiscale dynamics. The result is initial fields that are consistent with observations, complex geometry and dynamics, and that can simulate the evolution of ocean processes without large spurious initial transients. A class of constrained weighted least […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32,28,5,54],"tags":[163,129,130,95,92,97,100,93,162,99,96,98,161,94],"class_list":["post-2905","post","type-post","status-publish","format-standard","hentry","category-numerical-ocean-modeling","category-multiscale-ocean-modeling","category-publications","category-papers-in-refereed-journals-multiscale-ocean-modeling","tag-complex-domain","tag-downscaling","tag-euler-lagrange","tag-fast-marching-method","tag-field-mapping","tag-free-surface","tag-islands","tag-least-squares","tag-multiply-connected","tag-multiscale","tag-primitive-equation","tag-reduced-dynamics","tag-two-way-nesting","tag-weak-constraints"],"_links":{"self":[{"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/posts\/2905","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2905"}],"version-history":[{"count":25,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/posts\/2905\/revisions"}],"predecessor-version":[{"id":3582,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=\/wp\/v2\/posts\/2905\/revisions\/3582"}],"wp:attachment":[{"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2905"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2905"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mseas.mit.edu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}