Climate change drives rapid decadal acidification in the Arctic Ocean from 1994 to 2020
Climate change drives rapid decadal acidification in the Arctic Ocean from 1994 to 2020
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DOI：
10.1126/science.abo0383
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发表时间：
2022-09
期刊：
影响因子：
56.9
通讯作者：
D. Qi;Z. Ouyang;Liqi Chen;Yingxu Wu;R. Lei;Baoshan Chen;R. Feely;L. Anderson;Wenli Zhong;Hongmei Lin;A. Polukhin;Yixing Zhang;Yongli Zhang;Haibo Bi;Xinyu Lin;Yiming Luo;Yanpei Zhuang;Jian-feng He;Jianfang Chen;W. Cai
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文献类型：
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作者：
D. Qi;Z. Ouyang;Liqi Chen;Yingxu Wu;R. Lei;Baoshan Chen;R. Feely;L. Anderson;Wenli Zhong;Hongmei Lin;A. Polukhin;Yixing Zhang;Yongli Zhang;Haibo Bi;Xinyu Lin;Yiming Luo;Yanpei Zhuang;Jian-feng He;Jianfang Chen;W. Cai
近几十年来，北冰洋经历了迅速变暖和海冰消失，成为第一个经历文石不饱和的开阔洋盆[文石饱和状态(Ωarg)<；1]。然而，它的长期海洋酸化趋势和潜在机制仍然没有记录在案。在这里，我们报告了那里的快速酸化，酸化速度是其他海洋盆地的三到四倍，并将其归因于十年时间尺度上海冰覆盖率的变化。海冰融化将海水暴露在大气中，促进大气中二氧化碳的快速吸收，降低其碱度和缓冲能力，从而导致pH和ΩArag急剧下降。我们预测PH值将进一步下降，特别是在海冰消退活跃的高纬度地区，而北极变暖可能会抵消未来Ωarg的下降。描述北极的加速北极变暖的速度比地球上任何可比的地区都快，因此那里的海冰迅速消失。qi等人研究发现，这种海冰流失导致地表水吸收更多大气二氧化碳，并促使北冰洋西部迅速酸化，酸化速度是其他洋盆的三到四倍。他们将这一发现归因于融化驱动的淡水添加以及由此导致的海水化学变化。-HJS由于海冰消失，北冰洋西部正在迅速酸化。
The Arctic Ocean has experienced rapid warming and sea ice loss in recent decades, becoming the first open-ocean basin to experience widespread aragonite undersaturation [saturation state of aragonite (Ωarag) < 1]. However, its trend toward long-term ocean acidification and the underlying mechanisms remain undocumented. Here, we report rapid acidification there, with rates three to four times higher than in other ocean basins, and attribute it to changing sea ice coverage on a decadal time scale. Sea ice melt exposes seawater to the atmosphere and promotes rapid uptake of atmospheric carbon dioxide, lowering its alkalinity and buffer capacity and thus leading to sharp declines in pH and Ωarag. We predict a further decrease in pH, particularly at higher latitudes where sea ice retreat is active, whereas Arctic warming may counteract decreases in Ωarag in the future. Description Acceleration in the Arctic The Arctic is warming at a rate faster than any comparable region on Earth, with a consequently rapid loss of sea ice there. Qi et al. found that this sea ice loss is causing more uptake of atmospheric carbon dioxide by surface water and driving rapid acidification of the western Arctic Ocean, at a rate three to four times higher than that of the other ocean basins. They attribute this finding to melt-driven addition of freshwater and the resulting changes in seawater chemistry. —HJS The western Arctic Ocean is rapidly acidifying due to sea ice loss.