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The abiotic formation of TEP under different ocean acidification scenarios

机译：不同海洋酸化情况下TEP的非生物形成

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In view of rising atmospheric CO_2 concentrations, the question if the marine biological carbon pump will increase or decrease in efficiency as ocean acidification progresses becomes central for predictions of future atmosphericp　pCO_2. Aggregation and sinking of aggregates contributes significantly to the flux of carbon to depths and changes in aggregation behavior will have far reaching consequences for the biological pump. The abundance and characteristics of transparent exopolymer particles, TEP, are central in regulating aggregation. We investigated the impact of ocean acidification on the abiotic formation of TEP from their precursors. Our results demonstrate that, contrary to earlier suggestions, ocean acidification as expected in the future ocean has no impact on the equilibrium conditions between TEP and their precursors. However, if the carbonate system is altered by adding acid, which does not simulate the future ocean carbonate system correctly, TEP concentration increases with decreasing pH, presumably due to changes in total alkalinity (TA). This implies that abiotic TEP formation is sensitive to changes in TA, but not pH. The discrepancy in results caused by different experimental approaches emphasizes the fact that acidification experiments do not mimic future conditions adequately and may even be misleading.
机译：鉴于大气中CO_2浓度的升高，随着海洋酸化进程的发展，海洋生物碳泵的效率会提高还是下降，这一问题成为预测未来大气p pCO_2的关键。聚集体的聚集和下沉极大地促进了碳向深度的通量，聚集行为的变化将对生物泵产生深远的影响。透明外聚合物颗粒TEP的丰度和特性在调节聚集方面至关重要。我们调查了海洋酸化对其前体TEP非生物形成的影响。我们的结果表明，与早期的建议相反，未来海洋中预期的海洋酸化对TEP及其前体之间的平衡条件没有影响。但是，如果通过添加酸改变了碳酸盐体系，而这不能正确模拟未来的海洋碳酸盐体系，则TEP浓度会随着pH值的降低而增加，这可能是由于总碱度（TA）的变化所致。这意味着非生物TEP的形成对TA的变化敏感，但对pH的变化不敏感。不同实验方法导致的结果差异强调了一个事实，即酸化实验无法充分模拟未来条件，甚至可能会产生误导。

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