北部湾夏冬季海表温度、叶绿素和浊度的分布特征及调控因素  

Seasonal Variations of Sea Surface Temperature,Chlorophyll-a and Turbidity in Beibu Gulf,MODIS Imagery Study

作　　者：黄以琛[1] 李炎[1] 邵浩[1] 李永虹[1] 

机构地区：[1]近海海洋环境科学国家重点实验室(厦门大学),福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2008年第6期856-863,共8页Journal of Xiamen University：Natural Science

基　　金：国家908专项(908-01-ST09);国家自然科学基金项目(40476023)资助

摘　　要：基于2006年6～8月和2006年12月～2007年2月的MODIS数据,分析北部湾夏季和冬季的海表温度、叶绿素及浊度的时空分布特征,并引入叶绿素与浊度的比值探讨浊度的控制因素,揭示径流、环流、风场和地形对北部湾上层水体环境要素的调控机制.夏季北部湾海表温度分布较为均匀,叶绿素浓度和浊度值沿岸带较高,外海较低.沿岸流海域浊度的主要影响因子是陆源输出物质和再悬浮沉积物,上升流海域则是浮游植物影响为主.冬季湾北沿岸流海域SST明显较低,海南岛西侧及中央海域存在一暖水舌,强化的混合作用导致叶绿素和浊度均明显高于夏季,再悬浮沉积物的影响也高于夏季.夏季发育跨中央海域的东向物质输送通道,冬季则发育西向物质输送通道.This study described temporal and spatial variations of sea surface temperature （SST）,chlorophyll-a （Chl-a） and turbidity （Turb） distributions in the Beibu Gulf using MODIS derived images from June 2006 to August 2006 （summer） and from December 2006 to February 2007 （winter）. The ratio of the chlorophyll-a and turbidity was introduced to trace the routes of suspended particulate matter. The results reveal significant seasonal features. In summer, warm surface water distributes evenly in the whole gulf while Chl-a and Turb concentrations are relatively lower and uniformity. The turbid coastal waters fringed the gulf are strongly related to river-output and re-suspended sediments, and the phytoplankton dominated waters are linked with upwelling area. In winter,the cold surface water is keeping on the northwest part while the tongue shape warm water is coming from southwestern gulf. Chl-a and Turb concentrations are higher than in summer because of intensified vertical mixing,as well as heavy input of suspended sediments and others from the Qiongzhou Strait. The distributions of ratio of the chlorophyll-a and turbidity also indicate two eastward particulate transporting routes across the gulf in summer and two westward routes in winter.

关 键 词：北部湾 海表温度 叶绿素 浊度 分布特征 MODIS 

分 类 号：X145[环境科学与工程—环境科学]