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Environmental controls on particle fluxes in the Gulf of Valencia, NW Mediterranean.
Marine Geology ( IF 2.9 ) Pub Date : 2020-10-28 , DOI: 10.1016/j.margeo.2020.106377
E. Isla , M. Ribó , P. Puig

Three instrumented lines were installed on the continental slope and the basin of the Gulf of Valencia for thirteen months (May 2010 to June 2011) aiming to study particle fluxes and their relationship with environmental parameters. Total mass flux varied between 52 mg m−2 d−1 in the central part of the basin and 7199 mg m−2 d−1 in the northern slope sector. The main biogenic constituent was calcium carbonate (estimated fraction) representing more than 26% of the total flux, whereas organic matter and biogenic silica add together <10%. These percentages were similar to the proportional contents in the sea floor sediment and were mainly attributed to advection of particles from the Ebro shelf during wave resuspension events. The coincidence in the temporal variation of the Ebro River discharges with the total mass flux observed in the Gulf of Valencia suggests that the effect of river discharges >400 m−3 s−1 can be detected at least 155 km to the southwest. The temporal variation of satellite-derived chlorophyll-a abundance and organic matter flux indicated that biogenic material collected in the Gulf of Valencia is related to sea surface spring phytoplankton blooms developing in the northwestern Mediterranean. However, the temporal variation of biogenic silica corresponded better with the usual pattern of deep chlorophyll-a maxima reached during the fall season, suggesting that diatoms are a main component in subsurface phytoplankton blooms.



中文翻译:

地中海西北瓦伦西亚湾的粒子通量环境控制。

为研究粒子通量及其与环境参数的关系,在十三个月(2010年5月至2011年6月)期间,在瓦伦西亚湾的大陆坡和盆地上安装了三条仪表管线。总质量通量在盆地中部的52 mg m -2 d -1和7199 mg m -2 d -1之间变化在北坡地区。主要的生物成分是碳酸钙(估计比例),占总通量的26%以上,而有机物和生物二氧化硅的总和<10%。这些百分比与海床沉积物中的比例含量相似,主要归因于波浪再悬浮事件中来自埃布罗(Ebro)陆架的颗粒平流。埃布罗河流量的时间变化与在瓦伦西亚湾观测到的总质量通量的一致性表明,河流量的影响> 400 m -3  s -1可以检测到距离西南至少155公里。卫星来源的叶绿素-a的丰度和有机质通量的时间变化表明,在瓦伦西亚湾收集的生物物质与地中海西北部海面春季浮游植物的开花有关。然而,生物硅的时间变化与秋季深叶绿素的通常模式更好地对应,后者在秋季达到最大值,表明硅藻是水下浮游植物开花的主要成分。

更新日期:2020-10-29
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