Impact of eddy parameterisations on the simulated response of Southern Ocean air-sea CO2 fluxes to wind stress changes in IPCC-type ocean models

拟议研究的主要目的是对最近开发的嵌入了海洋生物地球化学的粗分辨率海洋气候模式中的中尺度涡旋的新参数化进行系统评估。重点是模拟南大洋风和海-气碳通量之间的关系，作为基本的涡旋参数化的函数。到目前为止，有强有力的证据表明，由于对未解决的中尺度活动的参数化不足，耦合的气候生物地球化学模型高估了与南大洋增强的风有关的上升流。这反过来意味着，最先进的(基于模型的)海洋碳吸收预测是有重大缺陷的，因为预计上升流的增加会将太多溶解无机碳浓度较高的深水带到海气交换的表面。另一方面，海洋中尺度涡旋的参数化方面的最新进展尚未转移到耦合的海洋生物地球化学模式中。在这里，我们建议将最近发展的新的涡旋参数化应用到全球耦合的海洋生物地球化学模式中。在一系列模式实验中，我们争先恐后地探索南大洋海-气碳通量模式预测的不确定性与基本的中尺度涡旋参数化有关。

The main aim of the proposed research is a systematic assessment of recently developed new parameterisations for meso-scale eddies in coarse-resolution ocean-climate models with embedded marine biogeochemistry. The focus is on the simulated relation between Southern Ocean winds and air-sea carbon fluxes as a function of the underlying eddy parameterisation. There is strong evidence that, to date, coupled climate biogeochemical models overestimate the upwelling associated with strengthening winds in the Southern Ocean because of a deficient parameterisation of the unresolved mesoscale activity. This, in turn, implies that state-of-the-art (model based) projections of oceanic uptake of anthropogenic carbon are significantly flawed as the projected increase in upwelling brings too much deep water with high dissolved inorganic carbon concentrations to the surface where it is subject to air-sea exchange. On the other hand, recent advances in the parameterisation of meso-scale eddies in the ocean have not been transferred yet to coupled ocean biogeochemical models. Here, we propose to implement the recently developed new eddy parameterisations into a global coupled ocean biogeochemical model. In a suite of model experiments we strife to explore the uncertainty of model projections of air-sea carbon fluxes in the Southern Ocean associated with the underlying meso-scale eddy parameterisations.