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DOI	10.1016/j.palaeo.2020.109878
	Medieval versus recent environmental conditions in the Baltic Proper; what was different a thousand years ago?
	Andrén E.; van Wirdum F.; Norbäck Ivarsson L.; Lönn M.; Moros M.; Andrén T.
发表日期	2020
ISSN	0031-0182
卷号	555
英文摘要	A sediment record from the western Gotland Basin, northwestern Baltic Proper, covering the last 1200 years, was investigated for past changes in climate and the environment using diatoms as a proxy. The aim is to compare the environmental conditions reconstructed during Medieval times with settings occurring the last century under influence of environmental stressors like eutrophication and climate change. The study core records more marine conditions in the western Gotland Basin surface waters during the Medieval Climate Anomaly (MCA; 950–1250C.E.), with a salinity of at least 8 psu compared to the present 6.5 psu. The higher salinity together with a strong summer-autumn stratification caused by warmer climate resulted in extensive long-lasting diatom blooms of Pseudosolenia calcar-avis, effectively enhancing the vertical export of organic carbon to the sediment and contributing to benthic hypoxia. Accordingly, our data support that a warm and dry climate induced the extensive hypoxic areas in the open Baltic Sea during the MCA. During the Little ice Age (LIA; 1400–1700C.E.), the study core records oxic bottom water conditions, decreasing salinity and less primary production. This was succeeded during the 20th century, about 1940, by environmental changes caused by human-induced eutrophication. Impact of climate change is visible in the diatom composition data starting about 1975C.E. and becoming more pronounced 2000C.E., visible as an increase of taxa that thrived in stratified waters during autumn blooms typically due to climate warming. © 2020 The Authors
英文关键词	Baltic Sea; Diatoms; Hypoxia; Medieval Climate Anomaly; Phytoplankton seasonality; Pseudosolenia calcar-avis
语种	英语
scopus关键词	bottom water; climate change; diatom; environmental conditions; hypoxic conditions; Little Ice Age; Medieval Warm Period; paleoenvironment; proxy climate record; seasonal variation; stratification; Atlantic Ocean; Baltic Sea; Gotland Basin; Bacillariophyta
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150416
作者单位	Södertörn University, School of Natural Sciences, Technology and Environmental Studies, Huddinge, Sweden; Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany
推荐引用方式 GB/T 7714	Andrén E.,van Wirdum F.,Norbäck Ivarsson L.,et al. Medieval versus recent environmental conditions in the Baltic Proper; what was different a thousand years ago?[J],2020,555.
APA	Andrén E.,van Wirdum F.,Norbäck Ivarsson L.,Lönn M.,Moros M.,&Andrén T..(2020).Medieval versus recent environmental conditions in the Baltic Proper; what was different a thousand years ago?.Palaeogeography, Palaeoclimatology, Palaeoecology,555.
MLA	Andrén E.,et al."Medieval versus recent environmental conditions in the Baltic Proper; what was different a thousand years ago?".Palaeogeography, Palaeoclimatology, Palaeoecology 555(2020).