A meta-analysis of microcosm experiments shows that dimethyl sulfide (DMS) production in polar waters is insensitive to ocean acidification
A meta-analysis of microcosm experiments shows that dimethyl sulfide (DMS) production in polar waters is insensitive to ocean acidification
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DOI：
10.5194/bg-17-163-2020
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发表时间：
2020-01
期刊：
影响因子：
4.9
通讯作者：
Frances E. Hopkins;P. Nightingale;John A. Stephens;C. M. Moore;S. Richier;G. Cripps;Stephen D. Archer
中科院分区：
文献类型：
--
作者：
Frances E. Hopkins;P. Nightingale;John A. Stephens;C. M. Moore;S. Richier;G. Cripps;Stephen D. Archer
抽象。来自极地海洋的二甲基硫（DMS）排放在大气过程和气候中起着关键作用。因此，我们必须进一步了解这些区域的二甲硫醚生产如何应对气候变化。极地海洋特别容易受到海洋酸化的影响。然而，我们对极地二甲基硫醚反应的理解仅限于在北极沃茨进行的两项研究，在这两种情况下，二甲基硫醚浓度都随着酸度的增加而下降。在这里，我们报告了我们在北冰洋和南大洋不同地点进行的七个夏季船上微观实验的发现。这些实验表明，短期OA的DMS的净生产量的反硝化社区没有显着的影响。这与欧洲西北部温带大陆架沃茨的类似实验相反，在这些水域，表层海洋群落对有机酸的反应是溶解的二甲基硫浓度显著增加。对温带和极地沃茨（n=18次实验）的研究结果进行的荟萃分析显示，DMS对OA的反应存在明显的区域差异。根据我们的研究结果，我们假设，DMS的反应之间的差异，温带和极地沃茨反映了碳酸盐化学的自然变化，每个地区的各自的社区可能已经适应。如果是这样的话，未来的温带海洋可能对有机酸更加敏感，导致向大气排放的二甲硫醚增加，而令人惊讶的是，极地海洋的二甲硫醚排放可能保持相对不变。通过证明地理上不同地区的DMS排放可能会对OA产生不同的反应，我们的研究结果可能有助于更好地了解地球未来的气候。我们的研究表明，产生二甲基硫的过程对有机酸的反应方式可能因区域而异，在预测未来二甲基硫排放及其对地球气候的影响时应考虑到这一点。
Abstract. Emissions of dimethylsulfide (DMS) from the polar oceans play a key role in atmospheric processes and climate. Therefore, it is important to increase our understanding of how DMS production in these regions may respond to climate change. The polar oceans are particularly vulnerable to ocean acidification (OA). However, our understanding of the polar DMS response is limited to two studies conducted in Arctic waters, where in both cases DMS concentrations decreased with increasing acidity. Here, we report on our findings from seven summertime shipboard microcosm experiments undertaken in a variety of locations in the Arctic Ocean and Southern Ocean. These experiments reveal no significant effects of short-term OA on the net production of DMS by planktonic communities. This is in contrast to similar experiments from temperate north-western European shelf waters where surface ocean communities responded to OA with significant increases in dissolved DMS concentrations. A meta-analysis of the findings from both temperate and polar waters ( n=18 experiments) reveals clear regional differences in the DMS response to OA. Based on our findings, we hypothesize that the differences in DMS response between temperate and polar waters reflect the natural variability in carbonate chemistry to which the respective communities of each region may already be adapted. If so, future temperate oceans could be more sensitive to OA, resulting in an increase in DMS emissions to the atmosphere, whilst perhaps surprisingly DMS emissions from the polar oceans may remain relatively unchanged. By demonstrating that DMS emissions from geographically distinct regions may vary in their response to OA, our results may facilitate a better understanding of Earth's future climate. Our study suggests that the way in which processes that generate DMS respond to OA may be regionally distinct, and this should be taken into account in predicting future DMS emissions and their influence on Earth's climate.