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Climate change impact on primary production and phytoplankton taxonomy in Western Spitsbergen fjords based on pigments in sediments
Global and Planetary Change ( IF 3.9 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.gloplacha.2020.103158
Magdalena Krajewska , Małgorzata Szymczak-Żyła , Wojciech Tylmann , Grażyna Kowalewska

Abstract Arctic climate changes are of global significance. This work investigates the influence of climate change on primary production and phytoplankton taxonomic composition in the western Spitsbergen fjords over the last century, using pigments in sediments. Nine sediment cores were analysed for chloropigment and carotenoid contents, and the five found to be richest in pigments were dated (210Pb, 137Cs) and analysed for additional parameters (Corg, Ntot, δ13C, grain size). The three well-dated cores, representing the last 70–130 y, were selected for tracking primary production and phytoplankton taxonomy changes in the past. The sum of chloropigments-a (∑Chlns-a) in the undisturbed sediments is a good marker of primary production in the adjacent Spitsbergen fjord waters. The sum of 19′-hexanoyloxyfucoxanthin and 19′-hexanoyloxy-4-ketofucoxanthin to diatoxanthin ratio (∑Hexcs/Diato) in sediments is proposed as a proxy of changes in haptophytes to diatom and dinoflagellate proportions, connected with climate variability. ∑Chlns-a and ∑Hexcs/Diato ratio sediment profiles have shown that the impact of global warming on primary production and phytoplankton taxonomic composition is observed even in the north of Spitsbergen. In the most northern studied site, Raudfjorden, visible effects of warming started about a decade later than in Kongsfjorden. Recent high primary production in Kongsfjorden and Raudfjorden is related to a high proportion of haptophytes compared to diatoms and dinoflagellates, linked to warm Atlantic Water inflow. In Hornsund, primary production was also observed to have increased, but not as rapidly as at other sites, probably due to a greater influence of cold Arctic Water.

中文翻译:

基于沉积物中色素的气候变化对西斯匹次卑尔根峡湾初级生产和浮游植物分类的影响

摘要 北极气候变化具有全球意义。这项工作利用沉积物中的色素研究了上个世纪气候变化对斯匹次卑尔根峡湾西部初级生产和浮游植物分类组成的影响。分析了九个沉积物核心的叶绿素和类胡萝卜素含量,对发现色素最丰富的五个进行了测年(210Pb、137Cs)并分析了其他参数(Corg、Ntot、δ13C、粒度)。选择代表过去 70-130 年的三个日期确定的核心来跟踪过去的初级生产和浮游植物分类学变化。未受干扰沉积物中的氯色素-a (∑Chlns-a) 的总和是邻近斯匹次卑尔根峡湾水域初级生产的良好标志。沉积物中 19'-己酰氧基岩藻黄质和 19'-己酰氧基-4-酮岩藻黄质与硅藻黄质之比(∑Hexcs/Diato)的总和被提议作为触生植物与硅藻和鞭毛藻比例变化的代表,与气候变异有关。∑Chlns-a 和∑Hexcs/Diato 比沉积物剖面表明,即使在斯匹次卑尔根岛北部也观察到全球变暖对初级生产和浮游植物分类组成的影响。在最北部的研究地点 Raudfjorden,明显的变暖效应比 Kongsfjorden 晚了大约十年。Kongsfjorden 和 Raudfjorden 最近的高初级产量与较高比例的触生植物有关,而硅藻和甲藻与温暖的大西洋水流入有关。在 Hornsund,也观察到初级生产有所增加,
更新日期:2020-06-01
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