2019年夏秋季温州近海海水透明胞外聚合颗粒物(TEP)的分布及影响因素分析

Distribution and influencing factors of transparent exopolymer particles(TEP)in coastal waters of Wenzhou in the summer and autumn of 2019

透明胞外聚合颗粒物(TEP)具有高黏性、低密度和高碳氮比等特性,在颗粒有机物的聚集以及食物网循环中发挥着重要作用。为了解近岸海域TEP的分布动力学规律与机制,本文对温州近海夏秋季节水体中透明胞外聚合颗粒物的分布进行调查,并结合多项环境要素的主成分分析与相关性分析,探究了浙江南部近岸海域TEP分布的影响因素。结果显示,温州近海TEP秋季平均含量明显高于夏季,夏季TEP分布变化主要受陆地径流(瓯江)作用影响,而秋季主要受闽浙沿岸流影响。受沿岸流影响,秋季TEP的主要来源可能是其他海域以及底层颗粒物再悬浮。此外,由浮游植物释放的TEP对夏季的POC贡献最大,而秋季外源性TEP对POC的贡献较夏季有所升高。

Transparent exopolymer particles(TEP)have the characteristics of high viscosity,low density and high carbon to nitrogen ratio,hence they are playing an important role in the aggregation of organic particles and even the circulation of marine food web.In order to understand the dynamics and mechanisms of TEP distribution,the TEP in summer and autumn in the coastal waters of Wenzhou was investigated.The influencing factors of TEP were explored using principal component analysis and correlation analysis.The results showed that the average TEP content in the coastal waters of Wenzhou in autumn was significantly higher than that in summer.The distribution of TEP in summer is mainly affected by the export of Oujiang River,while in autumn it is mainly affected by the coastal current of Fujian and Zhejiang Provinces.Affected by coastal currents,the main source of TEP in autumn may be brought from the adjacent areas and the resuspension from bottom.In addition,TEP released by phytoplankton contributes the most to POC in summer,while the portion of allochthonous TEP to POC in autumn is higher than that in summer.