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首页> 外文期刊>Journal of marine systems: journal of the European Association of Marine Sciences and Techniques >Chemical properties and fluorescence of DOM in relation to biodegradation in the interconnected Marmara–North Aegean Seas during August 2008
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Chemical properties and fluorescence of DOM in relation to biodegradation in the interconnected Marmara–North Aegean Seas during August 2008

机译：相互联系的马尔马拉-北爱琴海在2008年8月的化学性质和DOM的荧光与生物降解的关系

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摘要

The dynamics of dissolved organic matter (DOM) in the Marmara Sea–Dardanelles Straits–North Aegean Sea were investigated using measurements of dissolved organic carbon and nitrogen (DOC, DON), PARAFAC modeling of 3-D excitation–emission fluorescence spectra and bacterial production (BP) and respiration (BR) rates. In the surface brackish waters, chemical parameters showed an increase from the Aegean to the Marmara (DOC: 65–217 μmol L~(?1); DON: 3.08–9.34 μmol L~(?1); Dissolved Inorganic Nitrogen (DIN): 0.044–1.38), followed by an increase in BP rates (7.2–195 nmol L~(?1) d~(?1)). In the subsurface waters, DIN also showed an increase in the Marmara basin (0.085–9.79 μmol L~(?1)) followed by an increase in BP rates (3.3–17.4 nmol L~(?1) d~(?1)). PARAFAC modeling revealed three fluorescent components: λ_(ex)/λ_(em): b260(330)/464 nm, humic-like; λ_(ex)/λ_(em): b(260) 285/364 nm, quinone-like; λ_(ex)/λ_(em): 270/308 nm, tyrosine-like. DOC:DON ratios were found similar for the Marmara (21 ± 3) and the N. Aegean Sea (19 ± 2). The slopes ΔDOC:ΔDON suggested that in the Marmara Sea mineralization processes require more carbon relative to nitrogen (22.3), whereas in the N. Aegean there is preferential removal of nitrogen over carbon (5.66). The lack of significant correlation between DOC and AOU (apparent oxygen utilization) in the deep Marmara waters indicates that particulate organic matter is important in deep mineralization processes.
机译：使用溶解有机碳和氮（DOC，DON）的测量，3-D激发-发射荧光光谱的PARAFAC模型和细菌产生，研究了马尔马拉海-达达尼尔海峡-北爱琴海中溶解有机物（DOM）的动力学。 （BP）和呼吸（BR）速率。在表层咸水中，化学参数显示从爱琴海到马尔马拉（DOC：65–217μmolL〜（？1）; DON：3.08–9.34μmolL〜（？1）;溶解无机氮（DIN） ：0.044–1.38），其后是BP率升高（7.2–195 nmol L〜（？1）d〜（？1））。在地下水域中，DIN也显示出马尔马拉盆地的水含量增加（0.085–9.79μmolL〜（？1）），随后BP速率增加（3.3–17.4 nmol L〜（？1）d〜（？1） ）。 PARAFAC建模揭示了三个荧光成分：λ_（ex）/λ_（em）：b260（330）/ 464 nm，呈腐殖质样; λ_（ex）/λ_（em）：b（260）285/364 nm，醌状; λ_（ex）/λ_（em）：270/308 nm，类似酪氨酸。发现马尔马拉（21±3）和爱琴海北部（19±2）的DOC：DON比值相似。斜率ΔDOC：ΔDON表示，在马尔马拉海的矿化过程中，相对于氮（22.3），需要更多的碳;而在爱琴海北部，氮的去除优先于碳（5.66）。马尔马拉深水域的DOC与AOU（表观氧气利用率）之间缺乏显着相关性，这表明有机颗粒在深部矿化过程中很重要。

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