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Dissolved organic carbon and nitrogen cycling along the west Antarctic Peninsula during summer
Progress in Oceanography ( IF 4.1 ) Pub Date : 2022-07-09 , DOI: 10.1016/j.pocean.2022.102854
Ribanna Dittrich , Sian F. Henley , Hugh W. Ducklow , Michael P. Meredith

The cycling of dissolved organic matter in the productive west Antarctic Peninsula (WAP) region is not well understood. For this study, dissolved organic carbon (DOC) and nitrogen (DON) concentrations and other biogeochemical measurements were collected along the WAP shelf during austral summer 2017. Concentrations of both DOC and DON in the upper ocean were lower than in lower latitudes (38.13–48.00 μmol C L−1, 2.90–10.52 μmol N L−1). DOC is produced along with particulate organic carbon during primary production, and is subsequently consumed by bacteria. DON shows high variability and is more likely the product of bacterial activity only in the surface waters. The N-isotopic composition of nitrate and particulate nitrogen showed intense nitrification, especially along the coast, and supports the findings of intense upper ocean cycling of organic matter of both particulate and dissolved forms. Export of DOM from the productive surface layer was negligible in the shelf waters of the WAP. Samples from glacial melt areas showed increased DON concentrations (7.88–10.52 μmol N L−1) so we conclude that increasing warming and continuing melting of Antarctic glaciers may lead to higher concentrations of dissolved organic matter but also higher bacterial activity with more intense upper-ocean carbon and nitrogen cycling.



中文翻译:

夏季南极半岛西部溶解有机碳和氮循环

生产性的南极西部半岛(WAP)地区溶解有机物的循环尚不清楚。在这项研究中,2017 年南方夏季沿 WAP 大陆架收集了溶解有机碳 (DOC) 和氮 (DON) 浓度以及其他生物地球化学测量值。上层海洋中的 DOC 和 DON 浓度低于低纬度地区 (38.13– 48.00 μmol CL -1 , 2.90–10.52 μmol NL -1)。DOC 在初级生产过程中与颗粒有机碳一起产生,随后被细菌消耗。DON 表现出高变异性,更有可能是仅在地表水中的细菌活动的产物。硝酸盐和颗粒状氮的 N 同位素组成显示出强烈的硝化作用,尤其是在沿海地区,并支持了颗粒状和溶解形式的有机物在海洋上层强烈循环的发现。在 WAP 的陆架水域中,从生产性表层排出的 DOM 可以忽略不计。来自冰川融化区的样品显示 DON 浓度增加(7.88–10.52 μmol NL -1) 因此我们得出结论,南极冰川变暖和持续融化可能会导致溶解有机物浓度升高,但也会导致更高的细菌活动以及更强烈的上层海洋碳和氮循环。

更新日期:2022-07-09
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