气候变化领域集成服务门户(CCPortal): Sediment core data from The Archipelago Sea, northern Baltic Sea, Finland, 2015

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.891284
	Sediment core data from The Archipelago Sea, northern Baltic Sea, Finland, 2015
	Jokinen; Sami A; Virtasalo; Joonas J; Jilbert; Tom; Kaiser; Jérôme; Dellwig; Olaf; Arz; Helge Wolfgang; Hänninen; J; Arppe; Laura; Collander; Miia; Saarinen; Timo
发布日期	2018-06-21
数据集类型	dataset
英文简介	The anthropogenically forced expansion of coastal hypoxia is a major environmental problem affecting coastal ecosystems and biogeochemical cycles throughout the world. The Baltic Sea is a semi-enclosed shelf sea whose central deep basins have been highly prone to deoxygenation during its Holocene history, as shown previously by numerous paleoenvironmental studies. However, long-term data on past fluctuations in the intensity of hypoxia in the coastal zone of the Baltic Sea are largely lacking, despite the significant role of these areas in retaining nutrients derived from the catchment. Here we present a 1500-year multiproxy record of near-bottom water redox changes from the coastal zone of the northern Baltic Sea, encompassing the climatic phases of the Medieval Climate Anomaly (MCA), the Little Ice Age (LIA), and the Modern Warm Period (MoWP). Our reconstruction shows that although multicentennial climate variability has modulated depositional conditions and delivery of organic matter (OM) to the basin the modern aggravation of coastal hypoxia is unprecedented, and besides gradual changes in the basin configuration, it must have been forced by excess human-induced nutrient loading. Alongside the anthropogenic nutrient input, the progressive deoxygenation since the beginning of the1900s was fueled by the combined effects of gradual shoaling of the basin and warming climate, which amplified sediment focusing and increased the vulnerability to hypoxia. Importantly, the eutrophication of coastal waters in our study area began decades earlier than previously thought, leading to a marked aggravation of hypoxia in the 1950s. We find no evidence of similar anthropogenic forcing during the MCA. These results have implications for the assessment of reference conditions for coastal water quality. Furthermore, this study highlights the need for combined use of sedimentological, ichnological, and geochemical proxies in order to robustly reconstruct subtle redox shifts especially in dynamic, non-euxinic coastal settings with strong seasonal contrasts in the bottom water quality.
空间范围	Latitude: 60.235300 * Longitude: 22.044000
时间范围	2015-06-11T00:00:00 - 2015-06-11T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/215232
推荐引用方式 GB/T 7714	Jokinen,Sami A,Virtasalo,et al. Sediment core data from The Archipelago Sea, northern Baltic Sea, Finland, 2015.2018-06-21.https://doi.org/10.1594/PANGAEA.891284.