Lithogenic flux in the Japan Sea measured with sediment traps
Lithogenic flux in the Japan Sea measured with sediment traps
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DOI：
10.1016/j.marchem.2004.06.006
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发表时间：
2004-11-15
期刊：
影响因子：
3
通讯作者：
Noriki, S
中科院分区：
文献类型：
--
作者：
Otosaka, S;Togawa, O;Noriki, S
1999-2002年期间，通过沉积物捕集实验在日本海三个地点（日本海盆地西部、日本盆地东部和大和盆地）观测到颗粒物通量的时空变化。日本西部盆地 I km 深度的年平均质量通量为 455 mg/m(2)/天，日本东部盆地为 252 mg/m(2)/天，大和盆地为 147 mg/m(2)/天。在日本海，质量通量的区域差异远大于各区域不同深度质量通量的变化。在日本海 1 公里深处，超过 60% 的沉降颗粒由成岩铝硅酸盐和生物蛋白石组成。为了确定硅铝酸盐来源的指标，对日本海六个区域的表层沉积物中 28 种元素的浓度进行了比较。锰 (Mn)、钴 (Co) 和稀土元素 (REE) 的浓度存在区域差异。 La/Yb 和 Mn/Al 比率分别用作硅铝酸盐来源和颗粒“新鲜度”的指标。这些指标表明日本海的成岩物质有三个来源：（1）“新鲜”亚洲黄土（即科萨）的大气输入，（2）对马暖流（TWC）从东海横向输送“老”亚洲黄土，以及（3）来自萨哈林岛弧和日本群岛的横向输送。在日本西部盆地，冬季和春季观察到来自亚洲大陆的颗粒，占到了84%。日本盆地西部1公里深度的年度成岩通量。这些颗粒被认为是由KOSA的输入直接供应到日本海表面的，因为这些颗粒显示出“新鲜”颗粒的特征。另一方面，在大和盆地发现了“古老的”亚洲黄土，表明TWC将亚洲黄土从东海输送到了日本海南缘。日本海南部的零星洋流被认为在将黄土颗粒带到大和盆地内部方面发挥了作用。在日本东部盆地，据计算，每年87%的成岩通量来自岛弧。这些颗粒很可能是通过水柱从日本列岛横向输送的。 (C) 2004 Elsevier B.V. 保留所有权利。
Spatial and temporal variations of particulate flux were observed by sediment trap experiments at three locations in the Japan Sea (western Japan Basin, eastern Japan Basin and Yamato Basin) during the period 1999-2002. Annual mean mass flux at I km depth was 455 mg/m(2)/day in the western Japan Basin, 252 mg/m(2)/day in the eastern Japan Basin and 147 mg/m(2)/day in the Yamato Basin. In the Japan Sea, the regional differences in mass flux were much larger than the change of mass flux at different depths in each area. At 1 km depth in the Japan Sea, more than 60% of settling particles consisted of lithogenic aluminosilicates and biogenic opal. In order to determine indicators of the origin of aluminosilicates, concentrations of 28 elements in surface sediment at six areas of the Japan Sea were compared. Regional differences in concentration were seen in manganese (Mn), cobalt (Co) and rare earth elements (REEs). The La/Yb and Mn/Al ratios were used as indicators of the origin of aluminosilicates and the "freshness" of particles, respectively. These indicators suggested three sources of lithogenic material for the Japan Sea, (1) atmospheric input of "fresh" Asian loess (i.e. Kosa), (2) lateral transport of "old' Asian loess from the East China Sea by the Tsushima Warm Current (TWC), and (3) lateral transport from the Island arc of the Sakhalin and the Japan Islands. In the western Japan Basin, particles originating from the Asian Continent were observed during winter and spring, and it comprised 84% of annual lithogenic fluxes at 1 km depth in the western Japan Basin. These particles are considered to have been supplied directly to the surface of the Japan Sea by the input of KOSA, because these particles showed the signature of "fresh" particles. On the other hand, "old' Asian loess were found in the Yamato Basin, suggesting that the TWC transported Asian loess from the East China Sea to the southern margin of the Japan Sea. A sporadic current in the southern Japan Sea is considered to play a role in bringing loess particles to the interior of the Yamato Basin. In the eastern Japan Basin, it was calculated that 87% of annual lithogenic flux originated from the Island-arc. These particles likely were transported laterally from the Japanese Islands through the water column. (C) 2004 Elsevier B.V. All rights reserved.