Recent and Ongoing Changes in the High-latitude Atlantic (ROCHA)

高纬度大西洋近期和持续的变化 (ROCHA)

基本信息

批准号：
NE/J013137/1
负责人：
Simon Josey
金额：
$ 6.59万
依托单位：
NATIONAL OCEANOGRAPHY CENTRE
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2012
资助国家：
英国
起止时间：
2012 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FJ013137%2F1
关键词：
Recent Ongoing Changes latitude Atlantic

项目摘要

The high latitude seas of the North Atlantic are currently experiencing major changes (ocean warming, declining ice cover and major increases in heat loss to the atmosphere) associated with man-made climate change. These seas, specifically the Labrador, Irminger and Nordic (LIN) Seas are the key northern sites for the global ocean circulation. In recent research, we developed a temperature dataset spanning 2004-2008 for the Labrador and Irminger Seas from Argo float and Marine Mammal-Borne Sensor (MMBS) data. Our analysis of this dataset revealed that estimates of ocean boundary current temperatures in widely used international datasets are too warm by up to 2 deg Centigrade. Identification of such warm biases is critical to both observation and model-based studies of climate change impacts in this region. In our earlier study, we were restricted to a small spatial domain and a limited time period ending in 2008. However, as a result of expansion of the Argo float programme, new availability of additional MMBS data and the inclusion for the first time of glider and ship based measurements, we are now in position to develop a new much-enhanced dataset. Specifically, we are now able to extend the spatial domain to include the Nordic Seas (thereby including all North Atlantic dense water formation regions) and the time period to 2003-2012 (allowing a full examination of key changes in the past decade). In addition, it is now possible to include salinity as well as temperature, thereby enabling new insights into changing freshwater content and ocean density. We propose to develop a world-leading new T and S dataset covering the Labrador, Irminger and Nordic Seas, which will be the first to employ all available observations across this region. Furthermore, we will use the new dataset to a.) determine recent and ongoing changes in the LIN Seas, and b.) critically evaluate the NEMO ocean model (NERCs flagship computer model of the ocean) and thus identify the extent to which it can be relied upon to provide further insights in this area. The proposed research is a major advance on our previous study and is vital as the LIN Seas are widely recognised to be a key indicator region for the early detection of climate change impacts.

北大西洋高纬度海洋目前正在经历与人为气候变化相关的重大变化（海洋变暖、冰盖减少和大气热量损失大幅增加）。这些海洋，特别是拉布拉多海、伊尔明格海和北欧 (LIN) 海是全球海洋环流的主要北部地点。在最近的研究中，我们利用 Argo 浮标和海洋哺乳动物传感器 (MMBS) 数据开发了拉布拉多海和伊尔明格海 2004 年至 2008 年的温度数据集。我们对该数据集的分析表明，广泛使用的国际数据集中对海洋边界水流温度的估计值偏高高达 2 摄氏度。识别这种温暖偏差对于该地区气候变化影响的观测和基于模型的研究至关重要。在我们早期的研究中，我们仅限于一个小空间域和截至 2008 年的有限时间段。然而，由于 Argo 浮标计划的扩展、额外 MMBS 数据的新可用性以及滑翔机的首次纳入和基于船舶的测量，我们现在可以开发一个新的大大增强的数据集。具体来说，我们现在能够将空间域扩展到包括北欧海洋（从而包括所有北大西洋稠水形成区域）和时间段至 2003-2012 年（允许全面检查过去十年的关键变化）。此外，现在可以包括盐度和温度，从而能够对淡水含量和海洋密度的变化有新的见解。我们建议开发一个世界领先的新 T 和 S 数据集，涵盖拉布拉多海、伊尔明格海和北欧海，这将是第一个利用该地区所有可用观测数据的数据集。此外，我们将使用新数据集 a.) 确定 LIN 海洋最近和正在进行的变化，b.) 批判性地评估 NEMO 海洋模型（NERC 的海洋旗舰计算机模型），从而确定其可以在多大程度上发挥作用。可以信赖以提供该领域的进一步见解。拟议的研究是我们之前研究的重大进展，并且至关重要，因为林海被广泛认为是早期发现气候变化影响的关键指标区域。