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

提出的研究的主要目的是系统评估最近在嵌入海洋生物地球化学的粗分辨率海洋气候模式中开发的中尺度漩涡的新参数化。重点是模拟南大洋风和海气碳通量之间的关系，作为潜在涡参数化的函数。有强有力的证据表明，迄今为止，耦合气候生物地球化学模式高估了与南大洋强风相关的上升流，因为对尚未解决的中尺度活动缺乏参数化。这反过来意味着，海洋吸收人为碳的最新（基于模型的）预估存在明显缺陷，因为预估上升流的增加将太多具有高溶解无机碳浓度的深水带到海面，在那里它受到海气交换的影响。另一方面，海洋中尺度涡旋参数化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流参数化应用到全球耦合的海洋生物地球化学模型中。在一套模式实验中，我们努力探索与潜在中尺度涡旋参数化相关的南大洋海气碳通量模式预估的不确定性。

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.