夏季东海东北部营养盐的分布变化特征

发布时间：2018-01-16 18:32

本文关键词：夏季东海东北部营养盐的分布变化特征　出处：《海洋与湖沼》2017年04期 　论文类型：期刊论文

【摘要】：分别于2010年7月和2011年7月,在沿长江冲淡水扩散方向的东海东北部海域进行了典型站点CTD参数的测定和营养盐样品的采集,旨在了解长江不同径流量条件下该区域对长江冲淡水的响应过程及其中营养盐的分布变化特点。结果显示:在长江径流量较大的2010年7月,长江冲淡水(盐度31)在研究区域表层自西向东的扩散范围明显大于径流量较小的2011年7月。而含有高浓度NO_3-N(如15μmol/L)海水扩散范围在两个航次的变化却相反。由于海水层化以及表层浮游植物的吸收,各站表层NO_3-N、SiO_3-Si、PO_4-P等浓度一般较低,温盐跃层和次表层叶绿素最大值层以下其浓度升高并逐渐趋于稳定。2010年7月NH_4-N在研究区域各站贯穿整个深度的浓度明显大于2011年7月。与长江冲淡水和长江口相比,东海东北部水体表层SiO_3-Si/NO_3-N和PO_4-P/NO_3-N等营养盐摩尔比值明显降低。黑潮次表层水和黑潮中层水等水团含有较高的营养盐浓度(NO_3-N,SiO_3-Si及PO_4-P),与长江冲淡水相比,可能构成了东海东北部另一个重要的营养盐来源。
[Abstract]:In July 2010 and July 2011, the typical CTD parameters and nutrient samples were measured in the northeast waters of the East China Sea along the direction of Yangtze River flooding and fresh water diffusion. The purpose of this paper is to understand the response process of the region to the diluted water of the Yangtze River under different runoff conditions and the distribution and variation characteristics of the nutrients in the Yangtze River. The results show that in July 2010 the runoff of the Yangtze River is large. The diffusion range of Yangtze River diluted water (salinity 31) from west to east is obviously larger than that of July 2011, where the runoff is small, and contains high concentration of no _ 3-N (for example, 15 渭 mol / L). The range of sea water diffusion is opposite in two voyages, due to the stratification of seawater and the absorption of surface phytoplankton. The concentration of no _ 3-N _ 2O _ 3-SiO _ (4-P) in the surface layer of each station is generally low. The concentrations of NH_4-N in the thermohalocline layer and below the maximum chlorophyll layer in the subsurface layer increased and gradually stabilized. In July 2010, the concentration of NH_4-N in the whole depth of the stations in the study area was significantly higher than that in July 2011. Compared with the Yangtze River diluted water and the Changjiang Estuary. The molar ratios of nutrients such as SiO_3-Si/NO_3-N and PO_4-P/NO_3-N in the surface waters of the northeast East China Sea decreased obviously. The water masses such as the Kuroshio subsurface water and the Kuroshio middle water contained higher concentrations. Concentration of nutrients (. NO_3-N. Compared with the fresh water flushed by the Yangtze River, SiO_3-Si and PO4-PX may constitute another important source of nutrients in the northeast of the East China Sea.
【作者单位】：河口海岸学国家重点实验室华东师范大学;
【基金】：国家自然科学基金,41676066号科技部重点研发计划,2016YFA0600902号国家重点基础研究发展计划,2010CB951203号
【分类号】：P734
【正文快照】： 东海是西太平洋中半封闭的陆架边缘海,是世界最大的陆架海之一,其北部与黄海以长江口-济州岛连线为界,东北部通过对马海峡与日本海相连,南部通过台湾海峡与南海相连,东部和东南部与太平洋以冲绳海槽为界(图1)。该区域水动力环境复杂,受到长江冲淡水、东海陆架水、台湾暖流、黑

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