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: 0902835
• 负责人: Doron Nof
• 金额: $ 23.48万
• 依托单位: Florida 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=0902835&HistoricalAwards=false
• 关键词: Collaborative; research; Understanding; physics; Bering

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.

no . 0902835佛罗里达州立大学提供资金支持该项目的两个相关重点？海洋环流分析研究和古海洋输运变率估算。本提案的分析重点将是开发白令海峡流动稳态模型的时间依赖版本，该模型先前由PI开发。在进行物理海洋学研究的同时，co-PI将分析漫反射光谱和x射线荧光（XRF）数据，作为沉积物来源的代表，并分析白令海峡（BST）两岸样本的粒度变化，作为古洋流强度的代表。然后，他们将一起比较大西洋经向翻转环流（AMOC）弱或强的全球风场高和低的时期与英国夏令时强或弱气流的时期。他们已经有了一个很好的例子来证明这种方法的成功。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的气流增加，AMOC减弱，这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通过提供？自然实验?这些数据在其他情况下是无法获得的，并且通过为代用数据中观测到的过去海洋学变化提供动力解释而有益于古海洋学。