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Role of Mesoscale Ocean Dynamics in Air-Sea Coupling over the Southern Ocean

中尺度海洋动力学在南大洋海气耦合中的作用

基本信息

批准号：
1559151
负责人：
Igor Kamenkovich
金额：
$ 82.95万
依托单位：
University of Miami
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-06-01 至 2021-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1559151&HistoricalAwards=false
关键词：
Role Mesoscale Ocean Dynamics Air

项目摘要

The atmosphere and ocean interact on a wide range of spatial and temporal scales, and these interactions modulate weather and climate variability, as well as oceanic uptake of anomalous heat and carbon. At the oceanic mesoscale (about 10 to 100 km scales), advection is sufficiently strong to create strong gradients in sea surface temperature. As air blows across these very sharp fronts, the atmosphere cannot fully adjust, which leads to significant effects such as atmospheric cooling (warming) of warm (cold) sea surface temperatures. These effects are well pronounced in the Southern Ocean, where powerful mesoscale variability abounds. The main goal of this project is to explore mesoscale atmosphere-ocean interactions in the Southern Ocean and to understand how the ocean mesoscale creates sharp sea surface temperature fronts that modulate these interactions. This study will serve to inform global climate modeling efforts in terms of the identifying the key processes and required ocean resolution needed to correctly capture air-sea interactions. The project will advance a career of a female investigator and will train two graduate students in the fields of Physical Oceanography and Climate Science.Atmosphere-ocean coupling at mesoscale plays an important, but poorly understood role in climate variability, atmosphere and ocean dynamics, uptake of atmospheric gases and biogeochemistry. Understanding of this coupling has large practical importance for climate modeling, because a vast majority of climate models cannot fully resolve the mesoscale, which leads to biases in the simulations. The main hypothesis of this project is that a significant part of the sea surface temperature anomaly variability at the oceanic mesoscale is driven by mesoscale oceanic advection. The analysis will be carried out in a fully coupled model system in which mesoscale sea surface temperature anomalies both affect and are affected by the atmosphere, and the study will employ a blend of advanced theoretical considerations, comprehensive coupled simulations and targeted idealized studies, all with high resolution in the ocean. The particular focus of this study is on the Southern Ocean, both because of its large role in climate and because mesoscale variability is ubiquitous there, but our conclusions are expected to be relevant to the other parts of the World Ocean. One particular strength of this research is the merging of comprehensive climate simulations with a combination of idealized modeling and theory, in a fully coupled regime and with dynamically consistent mesoscale ocean circulation.

大气和海洋在广泛的空间和时间尺度上相互作用，这些相互作用调节天气和气候的变化，以及海洋对异常热量和碳的吸收。在海洋中尺度（约10至100公里尺度），平流作用很强，足以造成海洋表面温度的强烈梯度。当空气吹过这些非常尖锐的锋面时，大气无法完全调整，这导致了诸如大气冷却（变暖）温暖（寒冷）的海洋表面温度的显着影响。这些影响在南大洋非常明显，那里有大量强大的中尺度变率。该项目的主要目标是探索南大洋中尺度大气-海洋相互作用，并了解海洋中尺度如何产生调制这些相互作用的尖锐海面温度锋。这项研究将为全球气候建模工作提供信息，以确定正确捕获海气相互作用所需的关键过程和所需的海洋分辨率。该项目将促进一名女研究员的职业发展，并将培训两名物理海洋学和气候科学领域的研究生，中尺度大气-海洋耦合在气候变异、大气和海洋动力学、大气气体吸收和地球化学方面发挥重要作用，但人们对此知之甚少。了解这种耦合对气候模拟有很大的实际意义，因为绝大多数气候模式不能完全解决中尺度问题，这导致模拟中的偏差。该项目的主要假设是，海洋中尺度的海表温度异常变率的一个重要部分是由中尺度海洋平流驱动的。分析将在一个完全耦合的模型系统中进行，在该系统中，中尺度海表温度异常既影响大气，又受大气影响，研究将采用先进的理论考虑、全面的耦合模拟和有针对性的理想化研究，所有这些都在海洋中具有高分辨率。这项研究的特别重点是南大洋，因为它在气候中的重要作用，因为中尺度变率无处不在，但我们的结论预计将与世界海洋的其他部分。这项研究的一个特殊优势是将综合气候模拟与理想化建模和理论相结合，在一个完全耦合的制度和动态一致的中尺度海洋环流。