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Biological product system around the halocline in the brackish water environment and the geological record.

咸水环境盐跃层生物产物系统及地质记录.

基本信息

批准号：
15540436
负责人：
SETO Koji
金额：
$ 2.3万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540436/
关键词：
red tide halocline POC water mass structure anoxic environment high density layer of chlorophyll-a

项目摘要

Water quality and bottom sediment survey were carried out on Abashiri Lake, Aso sea, Uranouchi Bay, Notoro Lake and Nakaumi Lake and Shinji Lake in order to do this study problem. Features of the brackish environment are to be the environment where the top and bottom mixing is difficult to happen by the halocline. Therefore, the advection of water mass of bottom is mainly horizontally generated of the fresh water of the inflow side from the seaward. The bottom water mixes with the surface water, and it is discharged by the flow of the surface water. Inflow direction of surface water and bottom layer water is reverse-directional. Therefore, the weak mixing happens in the boundary of two flow. In addition, in the end of the water mass, the upwelling is generated by the river direction pushing in the tide, and the mixing becomes frequent. Therefore, the high production is maintained with the surface water by the mixture of bottom water of rich nutrient in Nakaumi Lake and Abashiri Lake, e … More tc.. Driving force of this bottom layer water circulation is water current from the river, mixed action by the wind, tide actions and so on. It continuously changes to the sediment of which only the reduced layer is seen from the sediment with thick oxidized layer in order to almost continuously shift to the end which shows absence of oxygen from entrance side which shows the environment where the bottom water is oxidative for such bottom water circulation for surface sediments. When it is considered at organic composition of the surface sediments, in entrance side which piles up in the environment where the organic substance is easy to be decomposed, the TOC contents is low. On the other hand, in end side which piles up in the environment where the organic substance is difficult to be decomposed, the TOC contents is high. In addition, the difference will be extremely possible for the TOC contents in entrance and end side of bottom water mass, since there is some the enhanced production layer near the halocline. Less

为了进行本研究课题，对网走湖、阿索海、天之内湾、能投湖、中见湖和新寺湖进行了水质和底质调查。咸化环境的特征是盐跃层使顶部和底部混合难以发生。因此，底层水团的平流主要是流入侧的淡水从向海方向水平产生的。底层水与地表水混合，并通过地表水的流动排出。地表水和底层水的入流方向相反。因此，在两个流动的边界处发生弱混合。此外，在水团末端，由于河流方向在潮汐中的推动而产生上涌，混合变得频繁。因此，中海湖和网走湖富营养化的底层水的混合， ...更多信息 tc..该底层水循环的动力是来自河流的水流，风的混合作用，潮汐作用等。它不断地从氧化层较厚的沉积物变化到只看到还原层的沉积物，以便几乎连续地移动到末端，末端显示入口侧没有氧气，这表明底层水氧化的环境。表层沉积物的水循环。从表层沉积物的有机组成来看，堆积在有机物易分解环境中的入口侧，TOC含量较低。另一方面，在堆积在有机物难以分解的环境中的端侧，TOC含量高。此外，由于盐跃层附近存在一定的增产层，底层水团入口侧和末端侧的TOC含量极有可能出现差异。少