Association between water darkening and hypoxia in a Norwegian fjord

IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY
Martine Røysted Solås , Anne Gro Vea Salvanes , Dag L. Aksnes
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引用次数: 0

Abstract

Previous studies have shown that climate change makes Norwegian fjords prone to deoxygenation and water darkening (reduced light penetration) with ecological implications across the food web from phytoplankton to fish. While deoxygenation occurs in deep fjord basins due to reduced water renewal, water darkening has primarily been linked to increased loads of colored dissolved organic matter (CDOM) of terrestrial origin in rivers draining to the Baltic Sea, the North Sea and ultimately to the Norwegian Coastal Current and associated coastal waters. Here, we investigate the hypothesis that water darkening is also linked to deoxygenation of fjord basins. We measure the downwelling irradiance in a water column with hypoxic and anoxic water and compare it with a nearby, well-oxygenated water column. Our data show increased darkening in the hypoxic and anoxic layers, likely due to elevated concentrations of CDOM that is produced locally in these layers. We discuss the ecological implication of this result, which we believe is particularly relevant for the mesopelagic habitat.
挪威峡湾海水变暗与缺氧之间的关系
以往的研究表明,气候变化使挪威峡湾容易出现脱氧和水体变暗(光线穿透力降低)现象,对从浮游植物到鱼类的整个食物网产生生态影响。深峡湾盆地因水体更新减少而出现脱氧现象,而水体变暗则主要与流入波罗的海、北海并最终流入挪威沿岸流和相关沿岸水域的河流中陆源彩色溶解有机物(CDOM)负荷增加有关。在这里,我们研究了水体变黑也与峡湾盆地脱氧有关的假设。我们测量了缺氧和缺氧水体中的下沉辐照度,并与附近的富氧水体进行了比较。我们的数据显示,缺氧和缺氧层中的暗度增加,这可能是由于这些层中局部产生的 CDOM 浓度升高所致。我们讨论了这一结果的生态意义,认为它与中层栖息地特别相关。
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来源期刊
CiteScore
5.60
自引率
7.10%
发文量
374
审稿时长
9 months
期刊介绍: Estuarine, Coastal and Shelf Science is an international multidisciplinary journal devoted to the analysis of saline water phenomena ranging from the outer edge of the continental shelf to the upper limits of the tidal zone. The journal provides a unique forum, unifying the multidisciplinary approaches to the study of the oceanography of estuaries, coastal zones, and continental shelf seas. It features original research papers, review papers and short communications treating such disciplines as zoology, botany, geology, sedimentology, physical oceanography.
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