Ocean and sea-ice dynamics in Nares Strait and the Canadian Arctic Archipelago

内雷斯海峡和加拿大北极群岛的海洋和海冰动态

基本信息

批准号：
NE/H01988X/1
负责人：
Helen Johnson
金额：
$ 50.04万
依托单位：
University of Oxford
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FH01988X%2F1
关键词：
Ocean sea ice dynamics Nares

项目摘要

The Canadian Arctic Archipelago (defined here to include Nares Strait which borders Greenland) is a key gateway that links the Arctic Ocean to the Atlantic. Changes in the flux of freshened seawater and ice through its channels have the potential to significantly affect the distribution of sea-ice in the Arctic and the strength of the Atlantic meridional overturning circulation, and hence influence both regional and global climate. Yet the ocean circulation in this region is poorly modelled, monitored and understood. This project will use a regional, high-resolution coupled ocean-sea-ice model to determine the dynamics that govern the flow through the archipelago. The processes by and timescales on which this flow adjusts to change in atmospheric forcing will also be identified. There will be a particular focus on Nares Strait, one of the three major channels, a key exporter of multi-year ice from the Arctic, and the subject of a recent intensive observational campaign. This project is timely in that it will provide fundamental physical understanding to aid in the interpretation and extrapolation of results from observational projects funded under the International Polar Year of 2007-2009. The results will allow us to make more confident estimates of the total freshwater flux currently exported through the Canadian Arctic Archipelago, and better founded predictions of future change. The inability of global climate models to represent the important dynamical processes that occur in the high-latitude ocean poses a serious problem for predictions of climate change. Determination of the underlying physical mechanisms and sensitivities is a crucial step towards understanding how these flows might be better represented.

加拿大北极群岛（此处定义为包含与格陵兰岛接壤的纳雷斯海峡）是将北极海与大西洋联系起来的关键门户。新鲜海水和冰通过其通道的通量变化有可能显着影响海冰在北极的分布以及大西洋子午的倾覆循环的强度，从而影响区域和全球气候。然而，该地区的海洋循环量很差，对其建模，监测和理解。该项目将使用区域高分辨率耦合的海洋冰模型来确定控制通过群岛流动的动力学。还将确定该流程适应大气强迫变化的时间尺度和时间尺度。将特别关注纳雷斯海峡，这是三个主要渠道之一，北极冰的主要出口国以及最近一次密集的观察运动的主题。该项目的及时是，它将提供基本的物理理解，以帮助解释和推断2007 - 2009年国际极地年度资助的观察项目结果。结果将使我们能够对当前通过加拿大北极群岛出口的淡水总通量进行更自信的估计，并更好地建立了对未来变化的预测。全球气候模型代表高纬度海洋中发生的重要动力学过程的无能为力，这给预测气候变化的预测带来了一个严重的问题。确定潜在的物理机制和敏感性是了解如何更好地代表这些流量的关键步骤。