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

佛罗里达州立大学提供资金支持本项目的两个相关重点？海洋环流分析研究和运输变异的古海洋学估算。 本提案的分析重点将是为先前由PI开发的白令海峡流量稳态模型开发一个随时间变化的版本。与此物理海洋学工作平行，co-PI将分析漫光谱反射率和X射线荧光（XRF）数据作为沉积物来源的代理，以及从白令海峡（BST）两侧采集的样品中的粒度变化作为古水流强度的代理。然后，他们将一起比较具有弱或强大西洋经向翻转环流（AMOC）的高和低全球风场时期与BST的强或弱气流时期。他们已经有了一个成功的范例。大约5000年前，南大洋的风明显减弱，同时（从地质学上讲）通过BST的流量增加，AMOC减弱，与他们的初步分析在概念上非常一致。他们的跨学科合作将有利于物理海洋学提供？自然实验？这些数据是其他方法无法获得的，并通过为代用数据中观察到的过去海洋学变化提供动力学解释而有益于古海洋学。

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.