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首页> 外文期刊>Estuarine Coastal and Shelf Science >Dissolved organic matter characterisation and temporal trends in Terra Nova Bay (Ross Sea, Antarctica)
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Dissolved organic matter characterisation and temporal trends in Terra Nova Bay (Ross Sea, Antarctica)

机译：Terra Nova湾（南极罗斯海）的溶解有机物特征和时间趋势

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In Terra Nova Bay, a coastal area of the Ross Sea (Antarctica), the dissolved organic matter (DOM) (proteinlike and humiclike) in the sea-water from two sampling stations was studied using the synchronous fluorescence technique and the evaluation of the dissolved proteins during the ice-free time lag (approximately four weeks). Moreover, a simple experiment was carried out to assess the DOM consumption by bacteria. At the two sampling stations, we observed changes in the concentrations of the different DOM types over time, related to the phytoplanktonic development (up to 5 μg l~(-1) of chlorophyll-a) and decrease (below 2 μg l~(-1) of chlorophyll-a within 10 days). A significant correlation was observed between the chlorophyll-a and the DOM. The proteinlike signal ranged from maximum values higher than 5 mg l~(-1) at the beginning of the sampling period to values lower than 2 mg l~(-1) at the end. Similarly, the humiclike compounds ranged from the highest values at the beginning (more than 30 μg l~(-1)) to values lower than 20 μg l~(-1) at the end of the sampling time. The dissolved proteins also showed notable changes over time, showing the highest values (more than 0.4 mg l~(-1)) during the first days of the sampling period and reduced concentrations (variable, but also below 0.05 mg l~(-1)) at the end. Due to the stability of the water column and of the meteorological conditions, we propose major roles for photodestruction and bacterial consumption in the potential "disappearance" of the DOM. The surface layer photodestruction (calculated extrapolating the rates from previous literature data) might explain the disappearance of 7% of the fluorescent DOM, leaving the predominant role to bacterial consumption. The experimental data confirmed the potential ability of bacteria to transform and/or take up the fluorescent DOM and the dissolved proteins. These results suggest that only a small part of the DOM is available for export during the winter mixing, reducing the role of the coastal Antarctic area in the CO_2 sink.
机译：在南极洲罗斯海沿岸的Terra Nova湾，使用同步荧光技术研究了两个采样站海水中的溶解性有机物（类蛋白质和腐殖质）（DOM），并对溶解性进行了评估无冰时间滞后（约四个星期）中的蛋白质。此外，进行了一个简单的实验来评估细菌对DOM的消耗。在两个采样站，我们观察到了不同DOM类型的浓度随时间的变化，与浮游植物的发育（叶绿素a高达5μgl〜（-1））有关，并降低了（低于2μgl〜（ -1）叶绿素-a在10天内）。在叶绿素-a和DOM之间观察到显着的相关性。蛋白样信号的范围从在采样周期开始时高于5 mg l〜（-1）的最大值到结束时低于2 mg l〜（-1）的值。类似地，类腐殖质化合物的范围从开始时的最大值（大于30μgl〜（-1））到低于采样时间结束时的20μgl〜（-1）。溶解的蛋白质还显示出随时间的显着变化，在采样期的前几天显示出最大值（大于0.4 mg l〜（-1）），并且浓度降低（可变，但也低于0.05 mg l〜（-1） ）） 在最后。由于水柱的稳定性和气象条件，我们提出了光毁灭和细菌消耗在DOM潜在“消失”中的主要作用。表面层的光毁灭（根据先前文献数据推算出的速率）可能解释了7％的荧光DOM的消失，而细菌的消耗则占主要地位。实验数据证实了细菌转化和/或吸收荧光DOM和溶解的蛋白质的潜在能力。这些结果表明，冬季混合期间只有一小部分DOM可用于出口，从而降低了南极沿海地区在CO_2汇中的作用。

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