Adiabatic reduction of circulation‐related CO2 air‐sea flux biases in a North Atlantic carbon‐cycle model
Adiabatic reduction of circulation‐related CO2 air‐sea flux biases in a North Atlantic carbon‐cycle model
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北大西洋碳循环模型中与循环相关的二氧化碳海气通量偏差的绝热减少
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Oschlies
中科院分区：
文献类型：
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作者：
C. Eden;A. Oschlies
碳、碱度、热量和营养物质的物理输运过程在很大程度上控制着海面CO2的分压，从而控制着海洋的碳吸收。使用一个最先进的北大西洋地球化学模型在涡流允许的分辨率，我们表明，模拟环流的偏差产生的误差在海气通量的CO2仍然大于那些与相当大的不确定性参数化的海气气体交换。一个semipregnancy校正方法，在保持水团性质和示踪剂的同时，对动量方程进行了修正，从而产生了一个更现实的描述，在北大西洋的碳通量，几乎没有额外的计算成本。由于更好地与观测的上层海洋流动模式，模拟的CO2吸收在校正的区域模型是由25%相比，未经校正的模型。
Physical transport processes of carbon, alkalinity, heat, and nutrients to a large extent control the partial pressure of CO2 at the sea surface and hence the oceanic carbon uptake. Using a state‐of‐the‐art biogeochemical model of the North Atlantic at eddy‐permitting resolution we show that biases in the simulated circulation generate errors in air‐sea fluxes of CO2 which are still larger than those associated with the considerable uncertainties in parameterizations of the air‐sea gas exchange. A semiprognostic correction method that adiabatically corrects the momentum equations while conserving water mass properties and tracers is shown to yield a more realistic description of the carbon fluxes into the North Atlantic at little additional computational cost. Owing to upper ocean flow patterns in better agreement with observations, simulated CO2 uptake in the corrected regional model is larger by 25% compared to the uncorrected model.