Tracing the heat signature of Atlantic Water through the GIN seas and its impact on Arctic ice and climate

追踪大西洋水通过 GIN 海域的热特征及其对北极冰和气候的影响

• 批准号: 2737265
• 金额: --
• 依托单位: Bangor University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2737265
• 关键词: Tracing; heat; signature; Atlantic; Water

Extreme weather such as floods, heat waves, unusually cold harsh winters are increasingly prevalent across the Northern Hemisphere. For instance, the Thames barrier, designed to prevent flooding of the London floodplain from a combination of high tides and storm surges has been raised 199 times since 1982, well in excess of the originally anticipated 1-2 times yearly. The occurrence of extreme weather has been linked to instabilities in the mid-latitude atmospheric jet stream and low sea-ice concentrations in the Arctic Barents and Kara Seas. Observations and ocean circulation models also show that the oceanic heat transport from thenorthernNorthAtlanticOceanintotheBarentsSeaisacontrollingfactorontheseaiceexten there. It is likely then, that the warm currents that melt Barents and Kara sea ice lose heat on their journey north, and also lose heat to the atmosphere above have a role to play in the destabilization of the atmosphere jet stream and extreme weather. This project will seek to quantify the heat loss from the North Atlantic Current as it wends its way north through the Greenland, Irminger and Norwegian Sea, identify ocean atmosphere heat exchange hotspots and evaluate their impact on both Barents and Kara sea ice and the atmospheric jet stream. The analysis will be conducted using existing hydrological and reanalysis datasets, as well as output from numerical coupled ocean-ice models, and climate model experiments.The proposed research complements the aims of the multidisciplinary ArctiCONNECT project that draws together atmospheric, meteorologic, climate and oceanographic experts from Exeter, Reading, Oxford, Southampton, Bangor, the National Oceanography Centre and the UK Met Office. The student will benefit from engaging with the wider ArctiCONNECT network while collaborating closely with Bangor ArctiCONNECT scientists and their co-supervisors, James Screen (Exeter) and Camille Lique (IFREMER, France)

洪水、热浪、异常寒冷的严冬等极端天气在北半球越来越普遍。例如，自1982年以来，为防止伦敦洪泛区因涨潮和风暴潮而发生洪水而设计的泰晤士河堤防已经提高了199次，远远超过了最初预计的每年1-2次。极端天气的发生与中纬度大气急流的不稳定以及北极巴伦支海和喀拉海的低海冰浓度有关。观测和海洋环流模式也表明，从北大西洋北部到巴伦支海的海洋热输送是控制巴伦支海的因素。很有可能，融化巴伦支和喀拉海冰的暖流在北上的过程中失去了热量，同时也失去了热量到上面的大气中，这在大气急流和极端天气的不稳定中发挥了作用。该项目将试图量化北大西洋洋流向北流经格陵兰岛、伊明格尔海和挪威海时的热量损失，确定海洋大气热交换热点，并评估它们对巴伦支和喀拉海海冰和大气急流的影响。分析将使用现有的水文和再分析数据集，以及数值耦合海洋-冰模式和气候模式实验的输出。拟议的研究补充了多学科ArctiCONNECT项目的目标，该项目汇集了来自埃克塞特、雷丁、牛津、南安普顿、班戈、国家海洋学中心和英国气象局的大气、气象、气候和海洋学专家。该学生将受益于参与更广泛的ArctiCONNECT网络，同时与班戈ArctiCONNECT科学家及其共同导师James Screen（埃克塞特）和Camille Lique（法国IFREMER）密切合作。