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

合作研究：通过古海洋学和建模了解白令海峡的物理原理

• 批准号: 0902818
• 负责人: Joseph Ortiz
• 金额: $ 18.8万
• 依托单位: Kent State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0902818&HistoricalAwards=false
• 关键词: Collaborative; research; Understanding; physics; Bering

Ortiz 0902818Kent 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 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. In parallel, the analytical focus of the co-PI will be to develop a time-dependent version of the steady state models of flow through BST that he has previously developed. 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.

奥提兹0902818肯特州立大学提供资金，以支持两个相关的重点，这个项目？海洋环流分析研究和运输变异的古海洋学估算。 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）两岸采集的样品中的粒度变化作为古水流强度的代理。与此同时，共同PI的分析重点将是开发一个依赖于时间的版本的稳态模型，通过BST，他以前开发的流量。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。