The biological carbon pump in CMIP6 models: 21st century trends and uncertainties.

The biological carbon pump in CMIP6 models: 21st century trends and uncertainties.
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DOI:
10.1073/pnas.2204369119
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发表时间:
2022-07-19
影响因子:
11.1
通讯作者:
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中科院分区:
综合性期刊1区
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生物碳泵(BCP)在海洋内部储存了来自大气的101,700 Pg C,但BCP未来碳封存变化的幅度和方向尚不确定。我们在最新的耦合模型相互比较项目第6阶段(CMIP 6)未来预测中量化了出口生产,下沉有机碳通量和固碳的全球趋势,发现在21世纪,SSP 3 -7.0情景下的固碳量持续增加19至48 Pg C,相当于2100年海洋碳总量增加的5%至17%。这与全球出口产量下降-0.15至-1.44Pg C y-1形成鲜明对比。然而,有很大的不确定性,在模拟未来的有机碳通量到深海与一系列不同的过程解决了跨模型。我们证明,在1,000米的有机碳通量是一个很好的预测长期固碳,并建议这是一个重要的衡量BCP,应优先在未来的模型研究。
The biological carbon pump (BCP) stores ∼1,700 Pg C from the atmosphere in the ocean interior, but the magnitude and direction of future changes in carbon sequestration by the BCP are uncertain. We quantify global trends in export production, sinking organic carbon fluxes, and sequestered carbon in the latest Coupled Model Intercomparison Project Phase 6 (CMIP6) future projections, finding a consistent 19 to 48 Pg C increase in carbon sequestration over the 21st century for the SSP3-7.0 scenario, equivalent to 5 to 17% of the total increase of carbon in the ocean by 2100. This is in contrast to a global decrease in export production of –0.15 to –1.44 Pg C y–1. However, there is significant uncertainty in the modeled future fluxes of organic carbon to the deep ocean associated with a range of different processes resolved across models. We demonstrate that organic carbon fluxes at 1,000 m are a good predictor of long-term carbon sequestration and suggest this is an important metric of the BCP that should be prioritized in future model studies.
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