Distribution characteristics of transparent exopolymer particles in the Pearl River estuary, China
Distribution characteristics of transparent exopolymer particles in the Pearl River estuary, China
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DOI：
10.1029/2012jg001951
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发表时间：
2012-12
影响因子：
--
通讯作者：
Cui-Ci Sun;You-Shao Wang;Qian P. Li;W. Yue;Yu-Tu Wang;F. Sun;Ya-lan Peng
中科院分区：
文献类型：
--
作者：
Cui-Ci Sun;You-Shao Wang;Qian P. Li;W. Yue;Yu-Tu Wang;F. Sun;Ya-lan Peng
在2009年8月和2010年1月的两个航次中，对珠江口透明外聚合物颗粒（TEP）的分布进行了调查。2009年8月和2010年1月的TEPcolor浓度分别为521.5 - 1727.4 mg Xeq. L-1（μ g黄原胶当量升（-1））和88.7 - 1586.9 μ g Xeq. L-1。在航行期间，TEP的大小一般沿纵向剖面向海增加，主要大小为2 - 40 μ m。实验结果表明，随着Ca~（2+）浓度的增加（从0.8 mmol L~（-1）到10 mmol L~（-1）），TEP的浓度和大小均增加。在盐度<16的表层，Ca2+浓度与TEP颜色浓度呈正相关。TEP浓度从中等盐度向海方向的降低部分是由于海水的稀释以及通过增加二价阳离子浓度增强了TEP的聚集和沉积。丰水期底层盐楔尖端TEP浓度与浊度最大值共存，冬季TEP与浊度呈正相关。TEP与浊度之间的关系表明，TEP的聚集对河口颗粒的絮凝沉降有重要贡献。两次航行期间TEP的不同模式可归因于物理过程（即，混合型）。这些结果表明，珠江口TEP的形成和分布在很大程度上受到物理和海洋地球化学过程的相互作用的影响。建立了珠江口TEP形成和分布的概念模型。引用：Sun，C. - C.的方法，Y. -- S.王，英-地P. Li，W. - z. Yue，Y. - t.王福，字-地L. Sun和Y. - L. Peng（2012），中国珠江口透明外聚合物颗粒的分布特征，J. Geophys.结果：117，G00N17，doi：10.1029/2012JG001951。
Distribution of Transparent Exopolymer Particles (TEP) in the Pearl River estuary, China, was investigated during two cruises in August 2009 and January 2010. TEPcolor concentrations were 521.5-1727.4 mg Xeq.L-1 (mu g Gum Xanthan equivalent liter(-1)) in August 2009 and 88.7-1586.9 mu g Xeq.L-1 in January 2010, respectively. The size of TEP generally increased in the seaward along the longitudinal section with the dominant size of 2-40 mu m during the cruises. Experimental work suggested that both concentration and size of TEP increased with Ca2+ concentration (from 0.8 mmol L-1 to 10 mmol L-1). In the field study, Ca2+ concentration had a positive correlation with TEPcolor concentration in the surface layer with salinity <16. Decrease of TEP concentration seaward from intermediary salinity was partly due to dilution of seawater as well as enhanced aggregation and sedimentation of TEP via increasing divalent cation concentration. TEP concentration and turbidity maximum coexisted at the tip of salt wedge in the bottom layer during the wet season, and positive correlation between TEP and turbidity was observed in the winter. Relationships between TEP and turbidity suggested the important contribution of TEP aggregation to flocculation and sedimentation of particles in estuaries. Different pattern of TEP during two cruises can be attributed to physical process (i.e., mixing type) in estuaries. These findings indicated that formation and distribution of TEP were largely influenced by interaction between physical and biogeochemical processes in the Pearl River estuary. A conceptual model for TEP formation and distribution in the Pearl River estuary was developed. Citation: Sun, C.-C., Y.-S. Wang, Q. P. Li, W.-Z. Yue, Y.-T. Wang, F.-L. Sun, and Y.-L. Peng (2012), Distribution characteristics of transparent exopolymer particles in the Pearl River estuary, China, J. Geophys. Res., 117, G00N17, doi: 10.1029/2012JG001951.