species foraminifera including in 14 genera were encountered from 39samples of core PC10, which were drilled in the Bransfield Strait of Antarctic Peninsula. They are divided into 3 assemblages as follow: 1. Siliceous...species foraminifera including in 14 genera were encountered from 39samples of core PC10, which were drilled in the Bransfield Strait of Antarctic Peninsula. They are divided into 3 assemblages as follow: 1. Siliceous shell assemblage; 2.Calcareous shell assemblage; 3. Mixed shell assemblage. The Siliceous shell assemblageoccurred in normal deep-sea, with weaker water dynamic condition. The Calcareousshell assemblage was formed by turbidity now, while the Mixed shell assemblage represented intense to weaker water dynamic condition. It changed from warm to cold towarm during the late Quaternary.展开更多
Due to the unique geographical location and sensitive response to global climate changes,the Antarctic region plays an important role in paleoclimate researches,and attracts great attentions from various scholars.One ...Due to the unique geographical location and sensitive response to global climate changes,the Antarctic region plays an important role in paleoclimate researches,and attracts great attentions from various scholars.One 324 cm long sediment core(ANT29-P7-09)was obtained from Prydz Bay,Antarctica,during the 29th Chinese National Antarctic Research Expedition.Based on sediment particle size,TOC,δ13C analyses and magnetism data,the authors show that the dominant magnetic minerals are ferrimagnetic pseudo single domain(PSD)-multi domain(MD)magnetite.Variations in the paleoenvironmental records allow us to define 4 zones in the core.These zones outline the climatic variations in the region since the late Early Pleistocene,including a warm period,a transitional period,and a cold period.The magnetic particle assemblage varies with glacial-interglacial cycles.Abrupt changes in particle size,TOC content,and geomagnetism occur at 102–90 cm deep in the core,indicating a sudden warming in the Antarctic region,signaling the onset of the Holocene.The authors identified 3 additional climatic signals in the middle part of the core(232–162 cm)that show unexpected cooling events during the warm period in Prydz Bay,Antarctica.展开更多
文摘species foraminifera including in 14 genera were encountered from 39samples of core PC10, which were drilled in the Bransfield Strait of Antarctic Peninsula. They are divided into 3 assemblages as follow: 1. Siliceous shell assemblage; 2.Calcareous shell assemblage; 3. Mixed shell assemblage. The Siliceous shell assemblageoccurred in normal deep-sea, with weaker water dynamic condition. The Calcareousshell assemblage was formed by turbidity now, while the Mixed shell assemblage represented intense to weaker water dynamic condition. It changed from warm to cold towarm during the late Quaternary.
基金This work was financially supported by“Global change and air-sea interaction”(GASI-GEOGE-05,GASI-04-01-02,GASI-02-PAC-CJ07,GAST-GEOGE-03)National Natural Science Foundation of China(41576069,41576063)Zhejiang Qingshan Lake Innovation Platform for Marine Science and Technology(2017E80001).
文摘Due to the unique geographical location and sensitive response to global climate changes,the Antarctic region plays an important role in paleoclimate researches,and attracts great attentions from various scholars.One 324 cm long sediment core(ANT29-P7-09)was obtained from Prydz Bay,Antarctica,during the 29th Chinese National Antarctic Research Expedition.Based on sediment particle size,TOC,δ13C analyses and magnetism data,the authors show that the dominant magnetic minerals are ferrimagnetic pseudo single domain(PSD)-multi domain(MD)magnetite.Variations in the paleoenvironmental records allow us to define 4 zones in the core.These zones outline the climatic variations in the region since the late Early Pleistocene,including a warm period,a transitional period,and a cold period.The magnetic particle assemblage varies with glacial-interglacial cycles.Abrupt changes in particle size,TOC content,and geomagnetism occur at 102–90 cm deep in the core,indicating a sudden warming in the Antarctic region,signaling the onset of the Holocene.The authors identified 3 additional climatic signals in the middle part of the core(232–162 cm)that show unexpected cooling events during the warm period in Prydz Bay,Antarctica.
