夏季台湾海峡的悬浮颗粒通道：现场粒度端元分析的证据  

Summer pathways for suspended particles across the Taiwan Strait:Evidence from the end-member analysis of in-situ particle size

作　　者：阮美娜[1] 李炎[1] 陈一宁[2,3] 陈嘉伟[2] 

机构地区：[1]福建省海陆界面生态环境重点实验室厦门大学环境科学研究中心,厦门361005 [2]厦门大学近海海洋环境科学国家重点实验室,厦门361005 [3]国家海洋局第二海洋研究所,杭州310012

出　　处：《科学通报》2012年第36期3522-3532,共11页Chinese Science Bulletin

基　　金：国家自然科学基金(40810069004,40876031,40949901)资助

摘　　要：应用端元分析模型对2010年夏季在台湾海峡海域由现场激光粒度分析仪(LISST)获得的悬浮颗粒现场粒度数据进行了反演,分离出与河口羽流、细粒沉积区、粗粒沉积区颗粒物动力学过程关联的3个悬浮颗粒现场粒度端元类型.应用夏季西南季风盛期各端元含量空间分布结构的分析,可分辨出珠江河口羽流携带的悬浮颗粒穿越台湾海峡进入台湾西部近岸海域的输运路径,观测到河口悬浮颗粒跨陆架输运载体由上层水体到跃层水体的沿程调整,证明了台湾海峡中部细粒沉积区的上层水体为夏季台湾西部沿岸来源悬浮颗粒横跨海峡的输运通道,而中下层水体则为夏季台湾海峡南部粗粒沉积区悬浮颗粒通过台湾海峡进入东海陆架的主要通道.An end-member model was used in the analysis of in-situ suspended particle size data obtained by a LISST Particle Analyzer Device in the Taiwan Strait during the summer of 2010.Three suspended particle size end-members,associated with particular sediment dynamic processes,are identified：（1） end-member 1,associated with estuarine plumes,（2） end-member 2,associated with a fine sediment zone,and（3） end-member 3,associated with a coarse sediment zone.The spatial distribution structure of the end-members shows a transport pathway in which suspended particles driven by the Pearl River estuarine plumes cross the Taiwan Strait and enter the western coastal waters of the Taiwan.Meanwhile,the carrier for suspended particles driven by estuarine plumes is observed to adjust from the upper water layer to the halocline layer along this pathway.The distribution of end-members also prove that the upper water layer above the fine sediment zone in the central part of the Taiwan Strait is the pathway for transporting the fine particles sourced from the west coast of Taiwan.Further,the middle and the lower water layers are found to be the main channel for the suspended particles from coarse sediment zone in the southern Taiwan Strait to enter the East China Sea.

关 键 词：悬浮颗粒 粒度 端元分析 台湾海峡 河口羽流 

分 类 号：X131.2[环境科学与工程—环境科学]