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首页> 外文期刊>Climate dynamics >Factors influencing anthropogenic carbon dioxide uptake in the North Atlantic in models of the ocean carbon cycle
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Factors influencing anthropogenic carbon dioxide uptake in the North Atlantic in models of the ocean carbon cycle

机译：海洋碳循环模型中影响北大西洋人为二氧化碳吸收的因素

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The uptake and storage of anthropogenic carbon in the North Atlantic is investigated using different configurations of ocean general circulation/carbon cycle models. We investigate how different representations of the ocean physics in the models, which represent the range of models currently in use, affect the evolution of CO_2 uptake in the North Atlantic. The buffer effect of the ocean carbon system would be expected to reduce ocean CO_2 uptake as the ocean absorbs increasing amounts of CO_2. We find that the strength of the buffer effect is very dependent on the model ocean state, as it affects both the magnitude and timing of the changes in uptake. The timescale over which uptake of CO_2 in the North Atlantic drops to below pre-industrial levels is particularly sensitive to the ocean state which sets the degree of buffering; it is less sensitive to the choice of atmospheric CO_2 forcing scenario. Neglecting physical climate change effects, North Atlantic CO_2 uptake drops below preindustrial levels between 50 and 300 years after stabilisation of atmospheric CO_2 in different model configurations. Storage of anthropogenic carbon in the North Atlantic varies much less among the different model configurations, as differences in ocean transport of dissolved inorganic carbon and uptake of CO_2 compensate each other. This supports the idea that measured inventories of anthropogenic carbon in the real ocean cannot be used to constrain the surface uptake. Including physical climate change effects reduces anthropogenic CO_2 uptake and storage in the North Atlantic further, due to the combined effects of surface warming, increased freshwater input, and a slowdown of the meridional overturning circulation. The timescale over which North Atlantic CO_2 uptake drops to below preindustrial levels is reduced by about one-third, leading to an estimate of this timescale for the real world of about 50 years after the stabilisation of atmospheric CO_2. In the climate change experiment, a shallowing of the mixed layer depths in the North Atlantic results in a significant reduction in primary production, reducing the potential role for biology in drawing down anthropogenic CO_2.
机译：使用海洋总循环/碳循环模型的不同配置，研究了北大西洋人为碳的吸收和储存。我们调查了模型中代表当前使用模型范围的海洋物理学中的不同表示如何影响北大西洋对CO_2吸收的演变。随着海洋吸收越来越多的CO_2，海洋碳系统的缓冲效应有望减少海洋对CO_2的吸收。我们发现缓冲效应的强度在很大程度上取决于模型海洋状态，因为它会影响吸收变化的幅度和时间。在北大西洋，CO 2吸收量下降到工业化前水平以下的时间范围对海洋状态特别敏感，海洋状态决定了缓冲的程度。它对大气CO_2强迫情景的选择不太敏感。忽略物理气候变化影响，在不同模型配置下，大气CO_2稳定后50到300年之间，北大西洋的CO_2吸收量降至工业化前水平以下。在不同的模型配置中，北大西洋的人为碳储存量相差无几，因为溶解的无机碳在海洋中的运输差异与CO_2的吸收相互抵消。这支持了这样一种观点，即在真实海洋中测得的人为碳清单不能用来限制地表吸收。由于地表变暖，增加的淡水输入和子午向上翻转循环的综合影响，包括物理气候变化的影响进一步减少了北大西洋人为的CO_2吸收和存储。将北大西洋的CO_2吸收量降至工业化前水平以下的时间范围减少了大约三分之一，从而导致在大气层CO_2稳定后大约50年的现实世界中该时间范围的估计。在气候变化实验中，北大西洋混合层深度的变浅导致初级生产的显着减少，从而降低了生物学在降低人为CO_2方面的潜在作用。

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