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Accumulation of organic matter in a mesotidal Mediterranean lagoon (Boughrara, Tunisia)
Estuarine, Coastal and Shelf Science ( IF 2.8 ) Pub Date : 2020-04-27 , DOI: 10.1016/j.ecss.2020.106780
Irena Ciglenečki , Milan Čanković , Milivoj Kuzmić , Marc Pagano

In the frame of the COZOMED project, concentrations of organic matter (TOC, DOC, POC) were monitored during two seasonal field campaigns (autumn, October 2016 and spring, April 2017) in the Boughrara Lagon, Tunisia. Results indicate strong influence of the seawater exchange and circulation, on the organic matter accumulation inside the lagoon, visible through a significant correlation between TOC and salinity in both seasons. Two times higher concentration of TOC (up to 5.5 mg/l) was recorded in autumn, when high salinity water (46 psμ) was present in the lagoon. POC made a relatively small percentage of TOC in autumn samples when high accumulation of TOC, especially its DOC fraction can be related to remineralization processes and zooplankton-mediated release of DOC. Indeed, PCA analysis identified DOC as the most significant factor influencing the observed variability in autumn samples, and correlated to NH4+ (p < 0.05) in surface waters, while POC was significantly (p < 0.05) correlated to chlorophyll a. During spring, organic matter in the lagoon was depth-dependent and under the high influence of salinity and temperature, and in the surface correlated to NO3-. Satellite data on lagoon water optical properties appear to support changes in measured organic matter concentrations indicating different optical properties of the water inside the lagoon during spring and autumn seasons. The ocean color remote sensing, with properly validated and tested robust algorithms, accommodating optically shallow waters, can provide valuable tools for monitoring and timely detection of possibly detrimental changes inside the lagoon.



中文翻译:

地中海中游泻湖(突尼斯布法拉拉)中有机物的积累

在COZOMED项目的框架内,在突尼斯的布法拉拉(Boughrara Lagon)的两次季节性野外活动(2016年10月秋季和2017年4月春季)中监测了有机物(TOC,DOC,POC)的浓度。结果表明,海水交换和循环对泻湖内部有机物积累的强烈影响可以通过两个季节的总有机碳和盐度之间的显着相关性看出。当泻湖中存在高盐度水(46psμ)时,秋天记录到的TOC浓度高出两倍(最高5.5 mg / l)。当TOC的高积累,特别是DOC含量与再矿化过程和浮游动物介导的DOC释放有关时,POC在秋季样品中占TOC的比例相对较小。确实,4 +(p <0.05)在地表水中,而POC 与叶绿素a显着相关(p <0.05)。在春季,在泻湖有机质深度依赖性和盐度和温度的高影响下,并在表面相关的NO 3 - 。关于泻湖水光学特性的卫星数据似乎支持了测得的有机物浓度的变化,表明在春季和秋季,泻湖内水的光学特性不同。海洋色彩遥感具有经过适当验证和测试的健壮算法,可容纳光学浅水区,可为监测和及时检测泻湖内部可能有害的变化提供有价值的工具。

更新日期:2020-04-27
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