黄海和东海表层悬沙浓度年际变化特征

发布时间：2019-06-17 13:50

【摘要】：运用547 nm反射率、海表温度和海表风场遥感数据,分析了黄、东海表层悬沙浓度的年际变化特征、影响因素和形成机理。研究区近岸海域表层悬沙浓度较高,远离陆地的海域悬沙浓度一般较低,且存在明显的季节变化,其季节变化的敏感区(变化较大的区域,其反射率差大于1%)为浑浊羽状流分布区域和近岸海域。该羽状流从江苏海岸向东偏南方向延伸至黄、东海陆架中部,其边界以4 mg/L表层悬沙浓度为标志,冬季最盛,夏季最弱,甚至消失。研究区表层悬沙浓度也存在明显的年际变化,其冬季敏感区为浑浊羽状流与朝鲜半岛之间的海域(即羽状流东北部)、台湾海峡、近岸海域、浑浊羽状流南部边缘;其夏季敏感区主要是近岸海域。悬沙浓度年际变化的幅度略小于季节变化。冬季黄海暖流和台湾暖流对浑浊羽状流的扩散起阻碍作用,二者基本框定了该季节浑浊羽状流的边界范围,其年际变化形成多年尺度上冬季表层悬沙浓度的敏感区。虽然风浪作用对悬沙浓度变化有影响,但不是影响年际变化的主要因素。研究区冬季浑浊羽状流的形成和扩展的变异是受陆架环流控制的,是表层悬沙向深海输运的重要因素。此外,对敏感区的平均海表温度与南方涛动指数(SO)I、太平洋十年涛动指数(PDO)I的相关分析结果表明,本区陆架环流的宏观格局受到了厄尔尼诺-南方涛动(ENSO)和太平洋十年涛动(PDO)的影响,而PDO的影响弱于ENSO。
[Abstract]:Based on the remote sensing data of 547 nm reflectivity, sea surface temperature and sea surface wind field, the interannual variation characteristics, influencing factors and formation mechanism of suspended sediment concentration in the surface of the Yellow Sea and the East China Sea are analyzed. The suspended sediment concentration in the coastal area of the study area is higher than that in the coastal area, and the suspended sediment concentration in the area far from land is generally low, and there is obvious seasonal variation. The sensitive area of seasonal variation (the reflectivity difference is more than 1%) is the turbid plume distribution area and the coastal sea area. The plume extends from the coast of Jiangsu to the east and south to the yellow and the middle of the East China Sea shelf. The boundary of the plume is marked by the suspended sediment concentration on the surface of 4 mg/L, the highest in winter, the weakest in summer, and even disappeared. There is also obvious interannual variation of suspended sediment concentration in the surface of the study area, and the sensitive area in winter is the sea area between turbid plume and Korean peninsula (that is, the northeast of plume), the Taiwan Strait, the coastal sea area and the southern edge of turbid plume, and the sensitive area in summer is mainly inshore sea area. The interannual variation of suspended sediment concentration is slightly smaller than that of seasonal variation. Huang Hai warm current and Taiwan warm current hinder the diffusion of turbid plume in winter. They basically frame the boundary range of turbid plume in this season, and their interannual variation forms a sensitive area of suspended sediment concentration in winter on a multi-year scale. Although wind and wave have an effect on the change of suspended sediment concentration, it is not the main factor affecting the interannual variation. The variation of the formation and expansion of turbid plume in winter in the study area is controlled by the shelf circulation and is an important factor for the transport of suspended sediment from the surface to the deep sea. In addition, the correlation analysis between the average sea surface temperature in the sensitive area and the Pacific ten year oscillatory index (PDO) I shows that the macro pattern of the shelf circulation in this area is affected by the El Nino Southern Oscillation (ENSO) and the Pacific Ten year Oscillation (PDO), while the influence of PDO is weaker than that of ENSO..
【作者单位】：南京大学地理与海洋科学学院;南京大学海岸与海岛开发教育部重点实验室;
【基金】：国家重大科学研究计划(2013CB956500) 江苏省自然科学基金重点研究专项(BK2011012) 南京大学大学生创新训练计划(XY1310284012)
【分类号】：P731.2;P736.2

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