气候变化领域集成服务门户(CCPortal): Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere

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DOI	10.1016/j.quascirev.2020.106565
	Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere
	Hernández-Almeida I.; Bjørklund K.R.; Diz P.; Kruglikova S.; Ikenoue T.; Matul A.; Saavedra-Pellitero M.; Swanberg N.
发表日期	2020
ISSN	0277-3791
卷号	248
英文摘要	The high-latitude Northern Hemisphere is a key region in the global climate balance. Variations in sea-ice extent affect biological productivity, CO2 exchange and carbon drawdown. Marine proxies indicative of proximity of the ice-marginal zone are therefore essential to understand these processes. Amphimelissa setosa is nowadays a dominant radiolarian species in the Arctic basin and very abundant in the high-latitude North Atlantic. This species, now absent from the North Pacific, has been widely used as a qualitative proxy of modern and past environmental conditions in the high-latitude Northern Hemisphere. Using our new and published data on the distribution of A. setosa in plankton, sediment trap, surface sediment and downcore samples, we provide a quantitative ecological context for the occurrence of this species. We find that the optimal depth and season of A. setosa in the modern North Atlantic and the Chukchi Sea are 160 m and the late boreal summer/early fall (August–October), respectively. A regression model combining environmental variables (temperature, salinity, silicate and chlorophyll-a concentrations, apparent oxygen utilization, sea-ice) at that season and depth, are able to explain 43% of the distribution of this species in surface sediments. Based on these new findings, we conclude that the presence of A. setosa in surface sediments is closely related to high primary production in the proximity of the sea-ice and areas of ice rafting. The onset of this species started at ca. 1.5 Ma in the North Pacific, linked to a gradual cooling, increased silica availability and southward advance of the ice-margins since the Early Pleistocene. Amphimelissa setosa's decline in this region was likely caused by the development of a quasi-permanent halocline, perennial sea-ice and depletion of silica during marine isotope stage 4. In the high-latitude North Atlantic, the relative abundance of A. setosa appears to be related to cooling and supply of dissolved silica from the continent during ice-rafting events. The comprehensive approach taken in this study suggest that A. setosa is a useful proxy to explore past variations in the ice-cover in the high-latitude Northern Hemisphere. © 2020 The Author(s)
英文关键词	Amphimelissa setosa; Ice-edge; Northern hemisphere; Paleoecology; Proxy; Radiolaria
语种	英语
scopus关键词	Ecology; Regression analysis; Sea ice; Silica; Silicates; Surficial sediments; Apparent oxygen utilizations; Biological productivity; Chlorophyll-a concentration; Environmental conditions; Environmental variables; Marine isotope stages; Northern Hemispheres; Relative abundance; Population distribution; environmental gradient; global climate; marginal ice zone; marine isotope stage; Northern Hemisphere; paleoceanography; paleoenvironment; Pleistocene; radiolaria; relative abundance; sea ice; spatiotemporal analysis; Arctic Ocean; Atlantic Ocean; Atlantic Ocean (North); Chukchi Sea; Pacific Ocean; Pacific Ocean (North)
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151291
作者单位	Climate Geology, Department of Earth Sciences, ETH Zurich, Sonneggstrasse 5, Zurich, 8092, Switzerland; Natural History Museum, Department of Geology, University of Oslo, P.O. Box 1172 Blindern, Oslo, 0318, Norway; Departamento de Geociencias Marinas, Facultade de Ciencias, Universidade de Vigo, Campus Lagoas-Marcosende S/n, Vigo, 36310, Spain; P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovsky Prospect 36, Moscow, 117883, Russian Federation; Central Laboratory, Marine Ecology Research Institute, 300 Iwawada, Onjuku-machi, Isumi-gun, Chiba, Japan; School of Geography, Earth and Environmental Sciences, University of Birmingham, United Kingdom; 990 Shenandoah Ave DeltonaFL 32725-7423, United States
推荐引用方式 GB/T 7714	Hernández-Almeida I.,Bjørklund K.R.,Diz P.,et al. Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere[J],2020,248.
APA	Hernández-Almeida I..,Bjørklund K.R..,Diz P..,Kruglikova S..,Ikenoue T..,...&Swanberg N..(2020).Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere.Quaternary Science Reviews,248.
MLA	Hernández-Almeida I.,et al."Life on the ice-edge: Paleoenvironmental significance of the radiolarian species Amphimelissa setosa in the northern hemisphere".Quaternary Science Reviews 248(2020).