基于CART方法计算的黄河淡水水龄在渤海的分布变化特征

发布时间：2018-05-17 13:49

  本文选题：渤海 + ROMS模式　； 参考：《海洋与湖沼》2017年03期

【摘要】：通过计算黄河淡水在渤海内部的水龄变化,能够进一步了解由黄河口排出的溶解性污染物在渤海中的输运时间和分布规律。利用ROMS(Regional Ocean Modeling System)数值模型,加入了基于CART(the constituent-oriented age and residence time theory)方法计算水龄的模块,用于计算黄河淡水水龄在渤海的分布以及长期变化规律。模式较好地再现了渤海物理场以及黄河淡水水龄在渤海中的分布。模拟结果显示水龄在空间分布上差异很大,莱州湾平均水龄为700天,而辽东湾则高达1760天。渤海中部与辽东湾水龄时空分布表现出季节变化,冬季辽东湾水龄西低东高,高龄水自辽东湾东侧入侵渤海中部;夏季辽东湾水龄西高东低,渤海中部低龄水占优。黄河淡水水龄在年际时间尺度上存在明显差异,1998—2003年黄河淡水水龄较高且存在上升趋势,而2003—2007年则迅速下降,此变化主要由黄河入海径流量的改变导致;径流量增大会使淡水水龄降低,反之则会使水龄升高。黄河径流量对黄河淡水水龄的影响主要是通过改变目标区域黄河淡水浓度和低龄淡水质点在水团中所占的比例来实现的。
[Abstract]:By calculating the changes in the water age of the Yellow River fresh water in Bohai, we can further understand the transport time and distribution of dissolved pollutants discharged from the Yellow River Estuary in Bohai. By using the ROMS (Regional Ocean Modeling System) numerical model, the method based on CART (the constituent-oriented age and residence time) method is added. The module of water age is used to calculate the distribution of the Yellow River fresh water age in Bohai and the law of long-term change. The model reproduces the distribution of Bohai physical field and the Yellow River fresh water age in Bohai. The simulation results show that the spatial distribution of water age is very different, the average water age of the Laizhou Bay is 700 days, while the eastern Liaodong Bay is up to 1760 days. The time and space distribution of water age in central and Liaodong Bay shows a seasonal variation. The water age of Liaodong Bay in winter is lower in the West and East in the east of the Liaodong Bay. The water age of the Liaodong Bay is in the middle of Bohai, the water age of Liaodong Bay is low in the West and the low age water in the middle of Bohai is dominant in the summer. The fresh water age of the Yellow River is obviously different on the interannual time scale, and the freshwater water of the Yellow River is higher in 1998 to 2003. And there is a rising trend, and the change from 2003 to 2007 is rapidly decreasing. This change is mainly caused by the change in the flow of the Yellow River into the sea. The increase of the runoff will reduce the age of fresh water, and on the contrary, it will increase the age of water. The influence of the Yellow River runoff on the freshwater age of the Yellow River is mainly by changing the fresh water concentration of the Yellow River and the fresh water quality of the low age in the target area. The proportion of the water masses is achieved.
【作者单位】： 中国海洋大学海洋与大气学院海洋学系;中国海洋大学物理海洋教育部重点实验室;
【基金】：国家自然科学基金项目,41276013号,41576004号,U1406401号 国家重点基础研究发展计划(973)项目,2014CB7450001号
【分类号】：P731
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本文编号：1901620