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Sensitivity of Arctic Ocean Change to Background Mixing

北冰洋变化对背景混合的敏感性

基本信息

批准号：
0909408
负责人：
James Morison
金额：
$ 63.71万
依托单位：
University of Washington
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：
2009-09-15 至 2014-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0909408&HistoricalAwards=false
关键词：
Sensitivity Arctic Ocean Change Background

项目摘要

Morison 0909408University of WashingtonDirect measurements of oceanic mixing are difficult, but decades of research suggest that deep background mixing is a consequence of dissipation of internal wave energy. The exact nature of this relationship is an open question, but it makes it possible to infer mixing from relatively simple observations of internal wave energy. The anticipated increase of summer ice-free waters in the Arctic should result in an increase in internal wave energy in the ocean and potentially unanticipated consequences for ocean processes and climate. The PI will analyze existing ocean data for internal waves and mixing using new methods, which in many cases have not been applied to the Arctic environment. The techniques will be tested against direct measurements of mixing done in an experiment by a collaborating Norwegian scientist. He will use existing data to examine the relation of mixing and internal waves and the relation of internal wave energy to the ice cover. He will also perform a simple study of the energetics of internal waves that combines existing ideas about the forcing of internal waves with new ice model results. Sensitivity studies with a large-scale ice ocean model will explore the Arctic Ocean model behavior under specified temporally and spatially varying background mixing and the potential for a positive ice-mixing feedback on climate.

华盛顿大学莫里森0909408直接测量海洋混合是困难的，但数十年的研究表明，深层背景混合是内波能量耗散的结果。这种关系的确切性质是一个悬而未决的问题，但它使得从相对简单的内波能量观测中推断混合成为可能。北极夏季无冰水域的预期增加应导致海洋内波能的增加，并可能对海洋进程和气候造成意想不到的后果。PI将使用新方法分析现有海洋数据的内波和混合，这些方法在许多情况下尚未应用于北极环境。这些技术将与一位合作的挪威科学家在一项实验中对混合的直接测量进行测试。他将利用现有的数据来研究混合和内波的关系，以及内波能量与冰盖的关系。他还将对内波的能量学进行简单的研究，将现有的关于内波强迫的想法与新的冰模型结果结合起来。使用大规模冰海模式进行的敏感性研究将探索北冰洋模式在特定的时间和空间变化的背景混合下的行为，以及对气候的正向冰混合反馈的可能性。