Temporal variation of particulate organic carbon flux at the mouth of Tokyo Bay.
Temporal variation of particulate organic carbon flux at the mouth of Tokyo Bay.
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DOI：
10.1007/s10872-022-00660-7
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发表时间：
2023
影响因子：
2.3
通讯作者：
Mino, Yoshihisa
中科院分区：
文献类型：
--
作者：
Sukigara, Chiho;Otosaka, Shigeyoshi;Horimoto-Miyazaki, Naho;Mino, Yoshihisa
关键词：
在东京湾入海口进行了750米深的沉积物捕集实验，以澄清颗粒从海湾到开阔海洋的数量和输送过程。较高的总质量通量(8.7 ± 4.5g·m-2·d-1)表明，这些颗粒不仅起源于圈闭上方的表层，而且集中在乌拉加海峡并排放到湾口。捕获颗粒的有机碳、氮同位素比值(δ13Corg、δ15N)与海湾表层沉积物的有机碳、氮同位素比值相似，即河流颗粒与海湾表层悬浮颗粒的混合物。与1995-2002年的实验结果相比，平均总质量通量降低了70%，有机碳含量降低了50%。被捕获颗粒物的δ13Corg值也低于上一次实验中观测到的值，这表明海湾δ13Corg值较高的表层悬浮颗粒物的贡献率较低。这些结果可能在一定程度上反映了海湾中悬浮颗粒碳的浓度在20年内下降了一半。导致湾口通量减少的另一个因素是，黑潮沿岸的水侵入湾内，将颗粒推到湾口，这是近年来没有发生的。
A sediment trap experiment was conducted at a depth of 750 m at the mouth of Tokyo Bay to clarify the quantity and transport process of particles from the bay to the open ocean. The high total mass flux (8.7 ± 4.5 g m–2 d–1) suggests that the particles not only originate in the surface layer right above the trap, but are also focused in Uraga Channel and discharged into the bay mouth. The organic carbon and nitrogen isotope ratios (δ13Corg, δ15N) of the trapped particles were like those of the surface sediment in the bay, that is, a mixture of particles in rivers and suspended particles in the surface layer of the bay. Compared with the results of the experiment conducted in 1995–2002, the average total mass flux was reduced by 70% and organic carbon content was reduced by 50%. The δ13Corg values of trapped particles were also lower than those observed in the previous experiment, indicating a lower contribution from surface-suspended particles with high δ13Corg values in the bay. These results could partly reflect a decrease of the concentration of the suspended particulate carbon in the bay by half over 20 years. Another factor contributing to the decrease of the flux at the bay mouth would be that the intrusion of Kuroshio coastal water into the bay, which pushes particles out to the bay mouth, has not occurred in recent years.
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影响因子：
5
作者：
Lehmann, MF;Bernasconi, SM;McKenzie, JA
通讯作者：
McKenzie, JA
影响因子：
2.3
作者：
Ando, Haruo;Maki, Hideaki;Ishii, Yuuichi
通讯作者：
Ishii, Yuuichi
影响因子：
3
作者：
Otosaka, S;Togawa, O;Noriki, S
通讯作者：
Noriki, S
DOI：
10.1016/j.dsr2.2008.04.011
发表时间：
2008-07-01
影响因子：
3
作者：
Lamborg, C. H.;Buesseler, K. O.;Wilson, S.
通讯作者：
Wilson, S.
DOI：
10.1016/s0967-0645(00)00014-x
发表时间：
2000-01-01
影响因子：
3
作者：
Giraudeau, J;Bailey, GW;Pujol, C
通讯作者：
Pujol, C