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

在Abashiri Lake，Aso Sea，Uranouchi Bay进行此研究问题上进行了水质和底部调查。底部的水与地表水的表面水混合在一起Nakaumi Lake和Abashiri Lake的Richent的Mixtoum Water，E ... More Tc .. More Tc ..这款底层水流的驱动力，风能混合，潮汐动作等等，潮汐作用，潮汐动作等等。从最厚的氧化层中的沉积物中可以看出。在有机物质被堆积的环境中，TOC含量在以太之手上是铅的，在以太之手上是铅此外，对于TOC内容的差异和底部水质量halocline的侧面差