| 摘要: |
| 分析了 2006 年 6 月和 2007 年 1 月用 LISST-100 对黄、东海悬浮物的观测数据, 研究了黄、东海的悬浮物粒径和体积浓度分布情况, 并从动力学角度对其进行解释。总体而言, 黄、东海悬浮细颗粒物的体积浓度分布为近岸高、远岸低; 上层悬浮物的沉降和底层沉积物的再悬浮, 使近底层的悬浮物浓度比上层高。冬季由于大风的影响, 悬浮物浓度比夏季高。粒径分布则为表层近岸细, 远岸粗; 台湾暖流、东海黑潮流经区域的底层粒径比近岸粗。由于悬浮物物源的影响, 夏季上层粒径比下层大, 并且比冬季大。受强台风“艾云尼”的影响, 长江口至济州岛连线, 以及 35°N 断面的悬浮物浓度夏季大于冬季。位于济州岛西南泥质区的 124.0°E, 32.1°N 处, 底层悬浮物浓度很高。35°N 断面位于海州湾及其外围, 夏季粒径比冬季细, 悬浮物浓度比冬季高。 |
| 关键词: 黄、东海, 悬浮物, 粒径分布, 体积浓度分布, LISST-100 |
| DOI：10.11693/hyhz201104002002 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973)项目:“中国东部陆架边缘海海洋物理环境演变及其环境效应”, 2005CB422300 号; 教育部新世纪优秀人才项目, NCET-05-059 2 号 |
附件 |
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| SEASONAL VARIATIONS IN THE DISTRIBUTIONS OF SUSPENDED FINE PARTICULATE MATTER IN THE YELLOW SEA AND THE EAST CHINA SEA |
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YU Lan-Lan, JIANG Wen-Sheng
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Key Laboratory of Physical Oceanography, Ocean University of China
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| Abstract: |
| In order to understand seasonal variations in the distributions of suspended particulate matter (SPM), laser in-situ scattering and transmissometry was used in two cruises in the Yellow Sea and The East China Sea in July, 2006 and January 2007, respectively. Distributions of volume concentration and particle size were investigated, based on this information we present explanations according to hydrodynamic conditions.
The inshore volume concentration of SPM was larger than the offshore, and they were also larger in winter (January) than in summer (July), due to strong wind during the winter time. Settling and tidally-induced resuspension of SPM accounted for the high turbidity above the seabed. The volume concentrations near the seabed were larger than in the water column. In addition, variation in the inshore particle distribution was smaller than that in the offshore for the surface layer; while at the bottom layer it was smaller in the inshore areas than the offshore, where the Taiwan Warm Current and Ku-roshio moved through. The particle size was smaller in winter than in summer. This was caused by the high concentration of the plankton in summer, as the size of biogenic detritus material was relatively large compared to the abiotic SPM.
Therefore, during the summer, as there was more plankton in the shallow waters than in the deep water, the particles were larger in the upper layer than lower layer, while they were also larger in the upper layer in summer than in winter. Because of the strong typhoon “Ewiniar”, the volume concentration of Section 04 and 35°N was higher in July 2006. The concentration of the 0404 site was very high above the seabed, and the 0404 site was in a mud area based on the bottom sediment graph. The particle size of Section 35°N, which was located near the Haizhou Bay, was larger in winter than in summer, whereas the volume concentration was lower in winter than in summer. |
| Key words: Yellow Sea and East Sea, Suspended particulate matter, Grain size distribution, Volume concentration distribution, Lisst-100 instrument |
