Collaborative research: Understanding the physics of the Bering Strait through paleoceanography and modeling

Nof 0902835佛罗里达州立大学提供的资金是为了支持这个项目的两个相关焦点？海洋环流的分析研究和运输变异性的古海洋学估计。这项提案的分析重点将是开发一个依赖于时间的版本的通过白令海峡的稳态水流模型，该模型以前由PI开发。在这项物理海洋学工作的同时，联合PI将分析漫反射光谱和X射线荧光(XRF)数据作为沉积物来源的替代物，并分析从白令海峡两岸采集的样品的粒度变化作为古洋流强度的替代物。然后，他们将一起比较具有弱或强大西洋子午线翻转环流(AMOC)的全球风场高、低的周期与BST强或弱气流的周期。他们已经有了这样一种方法成功的一个很好的例子。大约5000年前，南大洋风显著减弱，同时(从地质学上讲)通过BST的气流增加，而AMOC减弱，这与他们的初步分析在概念上是非常一致的。他们的跨学科合作将通过提供自然实验而使物理海洋学受益。通过为替代数据中观察到的过去的海洋学变化提供动力学解释，使古海洋学受益。

Nof 0902835Florida State UniversityFunds are provided to support two related foci of this project ? analytical studies of ocean circulation and paleo-oceanographic estimation of transport variability. The analytical focus in this proposal will be to develop a time-dependent version of the steady state models of flow through Bering Strait previously developed by the PI. In parallel with this physical oceanographic work, the co-PI will analyze diffuse spectral reflectance and X-Ray Fluorescence (XRF) data as proxies for sediment provenance, and grain size variation in samples taken from both sides of the Bering Strait (BST) as a proxy for paleo-current strength. Together, they will then compare periods of high and low global wind fields with weak or strong Atlantic Meridional Overturning Circulation (AMOC) to periods of strong or weak flows at the BST. They already have one excellent example for the success of such an approach. About 5000 years ago the Southern Ocean winds weakened significantly and, simultaneously (geologically speaking) the flow through the BST increased and the AMOC weakened, in an excellent conceptual agreement with their preliminary analytics. Their cross-discipline collaboration will benefit physical oceanography by providing ?natural experiments? that are otherwise unavailable, and benefit paleo-oceanography by providing dynamical explanations for the past oceanographic changes observed in proxy data.