Source partitioning of dissolved inorganic carbon addition to Pacific Winter Water in the western Arctic Ocean

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Zhangxian Ouyang, Amane Fujiwara, Shigeto Nishino, Akihiko Murata, Qian Li, Mariko Hatta, Yun Li, Najid Hussain, Wei‐Jun Cai
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Abstract

Pacific Winter Water (PWW) with high dissolved inorganic carbon (DIC) is the key water mass in which subsurface acidification occurs in the western Arctic Ocean. To investigate and partition carbon sources added to PWW across the Chukchi shelf to the adjacent Canada Basin, we investigated the distributions of DIC and its stable isotope (δ13C‐DIC) with other hydrographic and biogeochemical parameters during the Mirai cruise in the late summer of 2021. Using a four‐end‐member mixing model, we deciphered the water masses and separated DIC changes induced by biological processes from those induced by conservative mixing. We demonstrated that DIC dynamics in PWW were mainly controlled by the biological decomposition of organic carbon (OC). A mass balance model analysis of DIC and δ13C‐DIC suggested that the apparent δ13C signature of the respired organic carbon (δ13COCx) within PWW was −22.2‰ ± 1.1‰ on the shelf and −25.6‰ ± 1.6‰ in the basin. Therefore, we concluded that marine‐origin OC was the dominant carbon source that was decomposed in the Chukchi shelf bottom water, while respired terrestrial‐origin carbon made a major contribution to DIC pool in the basin PWW. We proposed that terrestrial OC from the Chukchi and Beaufort coastal seas could be an important carbon source, which was associated with winter water formation on the shelves and influenced by Beaufort Gyre state shift and circulation changes. This unconventional finding has important ramifications for the prediction of the future state of ocean acidification in the western Arctic Ocean.
北冰洋西部太平洋冬季水域溶解性无机碳增量的来源分区
具有高溶解无机碳(DIC)的太平洋冬季水(PWW)是北冰洋西部发生次表层酸化的关键水团。为了调查和划分太平洋冬季水从楚科奇大陆架到邻近加拿大海盆的碳源,我们在 2021 年夏末的未来号巡航中调查了 DIC 及其稳定同位素(δ13C-DIC)的分布以及其他水文和生物地球化学参数。利用四端混合模型,我们破译了水团,并将生物过程引起的 DIC 变化与保守混合引起的 DIC 变化区分开来。我们证明,压洼水域的 DIC 动态主要受有机碳(OC)生物分解的控制。对 DIC 和 δ13C-DIC 的质量平衡模型分析表明,在 PWW 中,陆架上呼吸有机碳的表观 δ13C 特征(δ13COCx)为-22.2‰±1.1‰,海盆中为-25.6‰±1.6‰。因此,我们得出结论:海洋源 OC 是楚科奇陆架底层水分解的主要碳源,而呼吸陆源碳则是海盆底层水 DIC 池的主要来源。我们提出,来自楚科奇和波弗特近海的陆源 OC 可能是一个重要的碳源,它与陆架冬季水的形成有关,并受波弗特环流状态变化和环流变化的影响。这一非常规发现对预测北冰洋西部海洋酸化的未来状态具有重要意义。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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