Sea-ice loss accelerates carbon cycling and enhances seasonal extremes of acidification in the Arctic Chukchi Sea

IF 5.1 2区 地球科学 Q1 LIMNOLOGY
Yixing Zhang, Yingxu Wu, Wei-Jun Cai, Xiangqi Yi, Xiang Gao, Haibo Bi, Yanpei Zhuang, Liqi Chen, Di Qi
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Abstract

The Chukchi Sea shelf (CSS) is a highly productive region in the Arctic Ocean and it is highly efficient for absorbing atmospheric carbon dioxide and exporting and retaining carbon in the deep sea. However, with global warming, the carbon retention time in CSS may decrease, leading to less efficient carbon export. Here, we investigate the seasonal variability of carbonate chemistry in CSS using three sets of late- vs. early-summer reoccupations of the same transect. Our findings demonstrate substantially increased and rapid degradation of biologically produced organic matter and therefore acidification over time in the southern CSS due to earlier sea-ice retreat, resulting in significantly shorter carbon retention time. In sharp contrast, no increased degradation has been observed in the northern CSS where photosynthesis has just commenced. In the future, climate change would further diminish the carbon export capacity and exacerbate seasonal acidification not only within CSS but also across other polar coastal oceans.

Abstract Image

海冰消失加速了碳循环并加剧了北极楚科奇海的季节性极端酸化现象
楚科奇海大陆架(CSS)是北冰洋的一个高产区域,它能高效吸收大气中的二氧化碳,并将碳输出和保留在深海中。然而,随着全球变暖,CSS 中的碳保留时间可能会缩短,导致碳输出效率降低。在此,我们利用三组同一断面的夏末与夏初重占情况,研究了 CSS 中碳酸盐化学的季节性变化。我们的研究结果表明,由于海冰消退较早,生物产生的有机物降解速度大大加快,因此南部 CSS 的酸化程度也随时间推移而增加,导致碳保留时间大大缩短。与此形成鲜明对比的是,在光合作用刚刚开始的 CSS 北部,没有观察到降解加剧的现象。未来,气候变化将进一步削弱碳输出能力,不仅会加剧南极海盆生态系统的季节性酸化,还会加剧其他极地沿岸海洋的季节性酸化。
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来源期刊
CiteScore
10.00
自引率
3.80%
发文量
63
审稿时长
25 weeks
期刊介绍: Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.
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