【摘要】：運用547 nm反射率、海表溫度和海表風(fēng)場遙感數(shù)據(jù),分析了黃、東海表層懸沙濃度的年際變化特征、影響因素和形成機(jī)理。研究區(qū)近岸海域表層懸沙濃度較高,遠(yuǎn)離陸地的海域懸沙濃度一般較低,且存在明顯的季節(jié)變化,其季節(jié)變化的敏感區(qū)(變化較大的區(qū)域,其反射率差大于1%)為渾濁羽狀流分布區(qū)域和近岸海域。該羽狀流從江蘇海岸向東偏南方向延伸至黃、東海陸架中部,其邊界以4 mg/L表層懸沙濃度為標(biāo)志,冬季最盛,夏季最弱,甚至消失。研究區(qū)表層懸沙濃度也存在明顯的年際變化,其冬季敏感區(qū)為渾濁羽狀流與朝鮮半島之間的海域(即羽狀流東北部)、臺灣海峽、近岸海域、渾濁羽狀流南部邊緣;其夏季敏感區(qū)主要是近岸海域。懸沙濃度年際變化的幅度略小于季節(jié)變化。冬季黃海暖流和臺灣暖流對渾濁羽狀流的擴(kuò)散起阻礙作用,二者基本框定了該季節(jié)渾濁羽狀流的邊界范圍,其年際變化形成多年尺度上冬季表層懸沙濃度的敏感區(qū)。雖然風(fēng)浪作用對懸沙濃度變化有影響,但不是影響年際變化的主要因素。研究區(qū)冬季渾濁羽狀流的形成和擴(kuò)展的變異是受陸架環(huán)流控制的,是表層懸沙向深海輸運的重要因素。此外,對敏感區(qū)的平均海表溫度與南方濤動指數(shù)(SO)I、太平洋十年濤動指數(shù)(PDO)I的相關(guān)分析結(jié)果表明,本區(qū)陸架環(huán)流的宏觀格局受到了厄爾尼諾-南方濤動(ENSO)和太平洋十年濤動(PDO)的影響,而PDO的影響弱于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..
【作者單位】： 南京大學(xué)地理與海洋科學(xué)學(xué)院;南京大學(xué)海岸與海島開發(fā)教育部重點實驗室;
【基金】：國家重大科學(xué)研究計劃(2013CB956500) 江蘇省自然科學(xué)基金重點研究專項(BK2011012) 南京大學(xué)大學(xué)生創(chuàng)新訓(xùn)練計劃(XY1310284012)
【分類號】：P731.2;P736.2

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本文編號：2501033