The role of ocean transport in the uptake of anthropogenic CO2
The role of ocean transport in the uptake of anthropogenic CO2
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DOI：
10.5194/bg-6-375-2009
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发表时间：
2009-01-01
期刊：
影响因子：
4.9
通讯作者：
Yool, A.
中科院分区：
文献类型：
--
作者：
Cao, L.;Eby, M.;Yool, A.
我们比较了模拟的海洋碳吸收响应脉冲二氧化碳排放使用一套全球海洋模型和地球系统模型。响应于590 Pg C的CO2脉冲发射（相当于大气CO2从278 ppm瞬间加倍到556 ppm），排放的CO2中被海洋吸收的部分是：发射脉冲后30年、100年和1000年分别为37 +/-8%、56 +/-10%和81 +/- 4%（模型平均值+/- 2 sigma）。从几十年到大约一个世纪的时间尺度上模拟的脉冲CO2的海洋吸收与所有模型中模拟的当今吸收的氯氟烃（CFCs）和CO2密切相关，而从一个世纪到一千年的海洋吸收的脉冲CO2的量与模拟的放射性碳在南部和太平洋深处密切相关。然而，如果将分析限制在能够在不确定性范围内重现观测结果的模型上，相关性通常要弱得多。从瞬时倍增CO2模拟确定了各个模型的表面到深海的传输速率，并将其用于计算海洋CO2吸收，以响应1000和5000 Pg C的不同大小脉冲的脉冲CO2排放。将这些结果与考虑气候-海洋碳循环耦合和不考虑气候-海洋碳循环耦合的若干模式模拟的海洋吸收CO2的结果进行了比较，结果表明，模式间不同的海洋输运速率对海洋吸收人为CO2的影响程度与单一模式中气候-碳循环反馈的影响程度相似，强调海洋运输在吸收人为CO2方面的重要作用。
We compare modeled oceanic carbon uptake in response to pulse CO2 emissions using a suite of global ocean models and Earth system models. In response to a CO2 pulse emission of 590 Pg C (corresponding to an instantaneous doubling of atmospheric CO2 from 278 to 556 ppm), the fraction of CO2 emitted that is absorbed by the ocean is: 37 +/- 8%, 56 +/- 10%, and 81 +/- 4% (model mean +/- 2 sigma) in year 30, 100, and 1000 after the emission pulse, respectively. Modeled oceanic uptake of pulse CO2 on timescales from decades to about a century is strongly correlated with simulated present-day uptake of chlorofluorocarbons (CFCs) and CO2 across all models, while the amount of pulse CO2 absorbed by the ocean from a century to a millennium is strongly correlated with modeled radiocarbon in the deep Southern and Pacific Ocean. However, restricting the analysis to models that are capable of reproducing observations within uncertainty, the correlation is generally much weaker. The rates of surface-to-deep ocean transport are determined for individual models from the instantaneous doubling CO2 simulations, and they are used to calculate oceanic CO2 uptake in response to pulse CO2 emissions of different sizes pulses of 1000 and 5000 Pg C. These results are compared with simulated oceanic uptake of CO2 by a number of models simulations with the coupling of climate-ocean carbon cycle and without it. This comparison demonstrates that the impact of different ocean transport rates across models on oceanic uptake of anthropogenic CO2 is of similar magnitude as that of climate-carbon cycle feed-backs in a single model, emphasizing the important role of ocean transport in the uptake of anthropogenic CO2.