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首页> 外文期刊>Marine Chemistry >Distribution of PARAFAC modeled CDOM components in the North Pacific Ocean, Bering, Chukchi and Beaufort Seas
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Distribution of PARAFAC modeled CDOM components in the North Pacific Ocean, Bering, Chukchi and Beaufort Seas

机译：PARAFAC建模的CDOM组件在北太平洋，白令，楚科奇和博福特海的分布

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摘要

The spatial and vertical distribution of colored dissolved organic matter (CDOM) in the North Pacific Ocean, Bering, Chukchi and Beaufort Seas was investigated with respect to water circulation. Four fluorescent components were identified in 546 samples using parallel factor analysis (PARAFAC): terrestrially-derived humic-like (C1), UV humic-like (C2), microbially derived humic-like (C3) and proteinaceous/tryptophan-like (C4) components. Deep water upwelling upon contact with the Aleutian Islands influenced optical properties of CDOM in Bering Sea surface water, where higher absorption coefficient at 355 nm (a_(355)), fluorescence intensities of all CDOM components and lower spectral slope (S_(275-295)) were found compared to surface waters of the Gulf of Alaska (p＜ 0.01). Further north, a marked increase in bioprocessed material (C4) was found in surface waters in Chukchi Sea. This finding was attributed to elevated biological activity in surface Chukchi water. Humic-like C1-C3 showed considerable dilution with increasing latitude from coastal to offshore regions in surface Beaufort Sea, suggesting a terrestrial predominance. This contrasts well with protein-like C4 where no significant gradient was found in Beaufort Sea surface water, supporting in situ generation. Finally, the vertical decrease of protein-like C4 relative to humic-like components Cl -3 suggests that humic-like CDOM is produced at depth as a byproduct of remineralization.
机译：研究了北太平洋，白令海，楚科奇海和博福特海中有色溶解有机物（CDOM）在水循环方面的空间和垂直分布。使用平行因子分析（PARAFAC）在546个样品中鉴定出四个荧光成分：陆生腐殖质样（C1），紫外线腐殖质样（C2），微生物衍生腐殖质样（C3）和蛋白质/色氨酸样（C4） ） 组件。与阿留申群岛接触后上升的深水影响了白令海表层水中CDOM的光学特性，其中在355 nm处的吸收系数更高（a_（355）），所有CDOM组分的荧光强度和较低的光谱斜率（S_（275-295） ））被发现与阿拉斯加湾的地表水相比（p ＜0.01）。再往北，在楚科奇海的表层水中发现了生物处理物质（C4）的显着增加。这一发现归因于楚科奇河表层水中生物活性的提高。腐殖质样的C1-C3随着波弗特海沿岸从沿海到近海区域的纬度增加而显示出相当大的稀释度，表明陆地优势。这与类似蛋白的C4形成鲜明对比，后者在Beaufort Sea地表水中没有发现明显的梯度，从而支持了原位生成。最后，相对于腐殖质样成分Cl -3而言，蛋白质样C4的垂直下降表明，腐殖质样CDOM作为再矿化的副产品在深处产生。

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