Dynamics and production of dissolved organic carbon in a large continental shelf system under the influence of both river plume and coastal upwelling
Dynamics and production of dissolved organic carbon in a large continental shelf system under the influence of both river plume and coastal upwelling
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河流羽流和沿海上升流影响下大型大陆架系统溶解有机碳的动态和产生
DOI：
10.1002/lno.10479
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发表时间：
2017-05
影响因子：
4.5
通讯作者：
Lin Jianrong
中科院分区：
文献类型：
--
作者：
Wu Kai;Dai Minhan;Li Xiaolin;Meng Feifei;Chen Junhui;Lin Jianrong
我们研究了溶解有机碳（DOC）的动态和生产在南海北方，这在很大程度上是由河流羽流和沿海上升流，在2008年夏季巡航的基础上形成的大型大陆架。羽流水从珠江口口延伸至陆架中部，DOC浓度较高，而近岸上升流水DOC浓度较低。DOC的生物生产被观察到在河流羽流和沿海上升流区与不同的行为之间的区域。在整个烟羽中，DOC的代谢表现为自养型，而在上升流中，DOC的代谢表现为混合营养型。然而，上升流区的DOC净生产率为11.5 ± 6.9 mmol C m−2 d−1，与羽流区的DOC净生产率（7.1 ± 7.0 mmol C m−2 d−1）相当。DOC的净生产与溶解无机碳（DIC）和无机营养盐的净消耗密切相关，表明DOC的净生产高度耦合到净群落生产（NCP）在羽流区和上升流区。这两个制度有类似的DOC/NCP分配，19-27%的NCP在羽流和24-26%的NCP在上升流区转化为DOC。颗粒有机碳（POC）和净DIC消费量之间也存在正相关关系，在大型浮游植物盛行的上升流区POC产量较高。NCP的去除主要是通过POC的沉降和DOC的扩散和水平输运进行的。
We examined the dynamics and production of dissolved organic carbon (DOC) on a large continental shelf in the northern South China Sea, which is largely shaped by a river plume and coastal upwelling, based on a cruise in summer 2008. The plume water extended from the mouth of the Pearl River estuary to the middle shelf and was characterized by high DOC concentrations, while the upwelled water occupying the nearshore area featured low DOC concentrations. Biological production of DOC was observed in both the river plume and the coastal upwelling zones with different behavior between regions. The system appeared to be autotrophic in terms of DOC throughout the plume, while in the upwelling circulation, the metabolism of DOC was mixed trophic. Nevertheless, the integrated net DOC production rate of 11.5 ± 6.9 mmol C m−2 d−1 in the upwelling zone was comparable to that in the plume (7.1 ± 7.0 mmol C m−2 d−1). The net DOC production correlated strongly with net consumption of dissolved inorganic carbon (DIC) and inorganic nutrients, suggesting that the net DOC production was highly coupled to net community production (NCP) in both the plume and upwelling zones. Both regimes had similar DOC/NCP partitioning, with 19–27% of NCP in the plume and 24–26% of NCP in the upwelling zones converted to DOC. A positive correlation was also found between particulate organic carbon (POC) and net DIC consumption, with higher POC production in the upwelling zones where large phytoplankton prevailed. Most NCP removal occurred through POC sinking and/or the diffusion and horizontal transport of DOC.
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