Characteristics of dissolved organic matter in Baltic coastal sea ice: allochthonous or autochthonous origins?
Characteristics of dissolved organic matter in Baltic coastal sea ice: allochthonous or autochthonous origins?
复制标题
DOI：
10.1021/es071210f
复制
发表时间：
2007-11
影响因子：
11.4
通讯作者：
C. Stedmon;D. Thomas;M. Granskog;H. Kaartokallio;S. Papadimitriou;H. Kuosa
中科院分区：
文献类型：
--
作者：
C. Stedmon;D. Thomas;M. Granskog;H. Kaartokallio;S. Papadimitriou;H. Kuosa
采用平行因子分析法（PARAFAC）对波罗的海沿岸沃茨海冰中溶解有机物（DOM）荧光进行了分析。海冰DOM的荧光特征与富腐殖酸沃茨有明显的不同，主要是蛋白质类荧光信号。PARAFAC分析确定了五种荧光成分，所有这些成分都存在于海冰和水中。三个腐殖酸组分与盐度呈负相关，并得出结论，陆源物质。波罗的海冰DOM被发现是一个混合物的腐殖物质从下面的水柱在冰形成和本地的材料由冰内的生物体产生。溶解有机碳（DOC）和氮（DON）浓度与腐殖酸荧光相关，表明波罗的海冰中的大部分有机碳和氮都结合在冰内捕获的陆地腐殖物质中。这对我们理解受河流输入影响的地区的海冰碳循环有影响（例如，波罗的海和北极沿海沃茨），因为DOM对降解和矿化的敏感性在很大程度上取决于其来源。
The origin of dissolved organic matter (DOM) within sea ice in coastal waters of the Baltic Sea was investigated using parallel factor (PARAFAC) analysis of DOM fluorescence. Sea ice DOM had distinctly different fluorescence characteristics than that of the underlying humic-rich waters and was dominated by protein-like fluorescence signals. PARAFAC analysis identified five fluorescent components, all of which were present in both sea ice and water. Three humic components were negatively correlated to salinity and concluded to be terrestrially derived material. Baltic Sea ice DOM was found to be a mixture of humic material from the underlying water column incorporated during ice formation and autochthonous material produced by organisms within the ice. Dissolved organic carbon (DOC) and nitrogen (DON) concentrations were correlated to the humic fluorescence, indicating that the majority of the organic carbon and nitrogen in Baltic Sea ice is bound in terrestrial humic material trapped within the ice. This has implications for our understanding of sea ice carbon cycling in regions influenced by riverine input (e.g., Baltic and Arctic coastal waters), as the susceptibility of DOM to degradation and remineralization is largely determined by its source.