Deep current structure in the Toyama Deep-Sea Channel in the Japan Sea
Deep current structure in the Toyama Deep-Sea Channel in the Japan Sea
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日本海富山深海航道的深海流结构
DOI：
10.1007/s10872-021-00622-5
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发表时间：
2022
影响因子：
2.3
通讯作者：
Tomoharu Senjyu
中科院分区：
文献类型：
--
作者：
B. Holben et al. (involved I. Sano;S. Mukai;M. Nakata);Tomoharu Senjyu
利用系泊观测资料，研究了日本海富山深海航道（TDSC）内的流场。提出了一种不对称的海流系统，在东坡和西坡上分别伴有近海和陆上海流。在大和盆地海上站观测到底部强化的流动特征。富山湾TDSC水体特征的不对称分布也表明了通道内水流系统的不对称；河道西侧坡面为溶解氧（DO）高、透光率（Tr）高的冷致密水团，东侧坡面为溶解氧（DO）低、透光率（Tr）低的冷致密水团，表明有来自富山湾源头的浊流。右侧面向较浅深度的电流，以及TDSC中的密度分布，表明在地球自转的影响下存在密度电流系统。在相同温度范围内，TDSC中溶解氧浓度明显低于近海区域。这表明，由于狭窄通道内的近海和在岸水流之间存在强烈的切变，TDSC西侧坡上的水团是经过改造的近海水团，与TDSC东侧坡上的低DO水团发生了明显的混合。
The flow field in the Toyama Deep-Sea Channel (TDSC) in the Japan Sea was investigated based on mooring observations. An asymmetric current system accompanying offshore and onshore currents over the east- and west-side slopes in the channel, respectively, is suggested. A bottom intensified flow characteristic was observed at the offshore stations in the Yamato Basin. The asymmetric current system in the channel is also suggested by the asymmetric distribution of water characteristics across the TDSC in Toyama Bay; a cold dense water mass with higher dissolved oxygen (DO) and higher transmittance (Tr) was found over the west-side slope of the channel, whereas a water mass with lower DO and lower Tr was distributed over the east-side slope, suggesting a turbidity current from the head of Toyama Bay. The currents facing the shallower depth on their right-hand-side, along with the density distribution in the TDSC, suggest a density current system under the influence of the earth’s rotation. The dissolved oxygen concentration in the TDSC was significantly lower than that in the offshore region of the same temperature range. This suggests that the water mass over the west-side slope in the TDSC is a modified offshore water mass which experienced significant mixing with the low DO water mass over the east-side slope in the TDSC, probably due to strong shear between the offshore and onshore currents in the narrow channel.