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首页> 外文期刊>Estuarine Coastal and Shelf Science >Biogeochemical alteration and fluxes of dissolved organic matter and nutrients in coastal bays
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Biogeochemical alteration and fluxes of dissolved organic matter and nutrients in coastal bays

机译：沿海海湾溶解有机质和营养素的生物地球化学改变及助源

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摘要

We measured dissolved organic carbon (DOC), delta C-13-DOC, fluorescent dissolved organic matter (FDOM), dissolved inorganic and organic nitrogen (DIN; DON), dissolved inorganic phosphate (DIP), and radium isotopes (Ra-223, Ra-224, and Ra-226) in three different bays: Gwangyang Bay (GB), Suyoung Bay (SB), and Ulsan Bay (UB), Korea. The water residence times based on Ra isotopes were approximately 15 (+/- 7) for GB and 1-3 days for SB and UB. UB and SB showed clear two (terrestrial and marine) endmember mixing trends for DOC, DIN, and DIP. In addition, significant "excess" DOC (10-50% of outer bay) was observed for SB under depleted nutrient conditions. GB, which had the longest water-residence time, showed depleted DIN and DIP, with large "excess" DOC (40-60% of the outer bay) and DON (10-40% of the outer bay) concentrations. The excess DOC observed in SB and GB was found to be marine in origin, although there was a slight influence of terrestrial DOC in the low-salinity waters of SB based on delta C-13-DOC values. Terrestrial humic-like FDOM was conservatively mixed in the three bays. The net fluxes of these components, estimated using the water residence times, suggest that GB is a significant source of DOM (DOC, DON, and humic FDOM) but a sink of DIN and DIP. SB and UB are the sources of inorganic nutrients as well as DOM to the open ocean. Therefore, our study reveals that the residence time of coastal embayment play an important role in the biogeochemical production and alteration of nutrients and DOM.
机译：我们测量溶解有机碳（DOC），Delta C-13-Doc，荧光溶解有机物（FDom），溶解无机和有机氮（DIN; DON），溶解无机磷酸盐（浸渍）和镭同位素（RA-223， RA-224和RA-226）在三个不同的海湾：Gwangyang Bay（GB），Suyoung Bay（SB）和Ulsan Bay（UB），韩国。基于RA同位素的水停留时间为GB的GB约为15（+/- 7），Sb和Ub的1-3天。 UB和SB表明，DOC，DIN和DIP的综合趋势明确两（陆地和海洋）的趋势。此外，在耗尽的营养条件下，对于Sb观察到显着的“过量”DOC（10-50％的外海湾）。 GB具有最长的水停留时间，显示出耗尽的DIN和DIP，具有大的“过量”DOC（40-60％的外部海湾），唐（10-40％的外部海湾）浓度。发现在SB和GB中观察到的过量医生是原产地的海洋，尽管陆地DOC在基于Delta C-13 Doc值的SB的低盐度水域中存在略有影响。陆地腐殖样的FDom保守地混合在三个海湾。这些组件的净助熔剂使用水停留时间估计，表明GB是DOM（DOC，DON和HUMIC FDOM）的重要来源，但是DIN和DIP的水槽。 SB和UB是无机营养素的来源以及开阔的海洋。因此，我们的研究表明，沿海压力机的停留时间在生物地球化学生产和营养和DOM的改变中发挥着重要作用。

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