海底生物可利用的溶解氨基酸大量流入海洋:东海/日本海的研究结果

IF 5.1 2区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Letters Pub Date : 2023-10-26 DOI:10.1002/lol2.10363
Hyekyung Park, Guebuem Kim, Sung-Han Kim, Jae Seong Lee
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摘要

我们测量了东日本海郁陵盆地海水和沉积物孔隙水中的溶解有机碳(DOC)和溶解总氨基酸(TDAA)。与深海相比,极光带的 DOC 和 TDAA 浓度分别高出 1.1 倍和 1.4 倍,沉积物孔隙水的 DOC 和 TDAA 浓度分别高出 11 倍和 43 倍。因此,在深海,来自孔隙水的 TDAA 和 DOC 输入通量分别是来自透光层的 2 倍和 0.4 倍。底栖通量对 TDAA 的贡献较大,而 TDAA 在底栖边界层(BBL)的停留时间较短(1.3 ± 0.9 年),这似乎导致了 BBL 中 TDAA 的急剧增加,尽管 DOC 浓度在整个深海中保持相对一致。AA 衍生指数也表明,BBL 中溶解有机物的生物利用率提高了。底栖生物输入似乎为深海提供了大量生物可利用的 TDAA,促进了微生物活动。
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Significant benthic fluxes of bioavailable dissolved amino acids to the ocean: Results from the East/Japan Sea

We measured dissolved organic carbon (DOC) and total dissolved amino acid (TDAA) in seawater and sediment porewater of the Ulleung Basin in the East/Japan Sea. The DOC and TDAA concentrations were 1.1- and 1.4-fold higher in the euphotic zone, and 11- and 43-fold higher in sediment porewater, respectively, than those in the deep ocean. Consequently, in the deep ocean, TDAA and DOC input fluxes from porewater were 2- and 0.4-fold of those from the euphotic zone, respectively. This larger contribution of benthic flux for TDAA and its shorter residence time in the benthic boundary layer (BBL) (1.3 ± 0.9 yr) seem to result in steep TDAA increases in the BBL, although DOC concentrations remained relatively uniform throughout the entire deep ocean. AA-derived indices also show enhanced bioavailability of dissolved organic matter in the BBL. Benthic inputs seem to supply a significant amount of bioavailable TDAA to the deep ocean, fueling microbial activity.

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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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