气候变化领域集成服务门户(CCPortal): Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382

CCPortal

DOI	10.1016/j.epsl.2020.116657
	Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382
	Pérez L.F.; Martos Y.M.; García M.; Weber M.E.; Raymo M.E.; Williams T.; Bohoyo F.; Armbrecht L.; Bailey I.; Brachfeld S.; Glüder A.; Guitard M.; Gutjahr M.; Hemming S.; Hernández-Almeida I.; Hoem F.S.; Kato Y.; O'Connell S.; Peck V.L.; Reilly B.; Ronge T.A.; Tauxe L.; Warnock J.; Zheng X.; the IODP Expedition 382 Scientists
发表日期	2021
ISSN	0012821X
卷号	553
英文摘要	Scotia Sea and the Drake Passage is key towards understanding the development of modern oceanic circulation patterns and their implications for ice sheet growth and decay. The sedimentary record of the southern Scotia Sea basins documents the regional tectonic, oceanographic and climatic evolution since the Eocene. However, a lack of accurate age estimations has prevented the calibration of the reconstructed history. The upper sedimentary record of the Scotia Sea was scientifically drilled for the first time in 2019 during International Ocean Discovery Program (IODP) Expedition 382, recovering sediments down to ∼643 and 676 m below sea floor in the Dove and Pirie basins respectively. Here, we report newly acquired high resolution physical properties data and the first accurate age constraints for the seismic sequences of the upper sedimentary record of the Scotia Sea to the late Miocene. The drilled record contains four basin-wide reflectors – Reflector-c, -b, -a and -a' previously estimated to be ∼12.6 Ma, ∼6.4 Ma, ∼3.8 Ma and ∼2.6 Ma, respectively. By extrapolating our new Scotia Sea age model to previous morpho-structural and seismic-stratigraphic analyses of the wider region we found, however, that the four discontinuities drilled are much younger than previously thought. Reflector-c actually formed before 8.4 Ma, Reflector-b at ∼4.5/3.7 Ma, Reflector-a at ∼1.7 Ma, and Reflector-a' at ∼0.4 Ma. Our updated age model of these discontinuities has major implications for their correlation with regional tectonic, oceanographic and cryospheric events. According to our results, the outflow of Antarctic Bottom Water to northern latitudes controlled the Antarctic Circumpolar Current flow from late Miocene. Subsequent variability of the Antarctic ice sheets has influenced the oceanic circulation pattern linked to major global climatic changes during early Pliocene, Mid-Pleistocene and the Marine Isotope Stage 11. © 2020 The Authors
关键词	Antarctic ice sheets evolution core-log-seismic correlation Drake Passage IODP Expedition 382 oceanic gateways Scotia Sea
英文关键词	Glacial geology; Glaciers; Infill drilling; Ocean currents; Reflection; Sedimentology; Seismology; Stratigraphy; Tectonics; Antarctic Bottom Water; Antarctic Circumpolar Currents; Global climatic changes; Marine isotope stages; Oceanic circulation patterns; Oceanographic variability; Seismic stratigraphy; Stratigraphic analysis; Ice; correlation; data acquisition; discontinuity; ice sheet; Miocene; morphostructure; paleoceanography; physical property; seismic stratigraphy; Antarctic Ice Sheet; Antarctica; Atlantic Ocean; Scotia Sea; Morpho
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203251
作者单位	British Antarctic Survey, Cambridge, United Kingdom; NASA Goddard Space Flight Center, Greenbelt, MD, United States; University of Maryland, College Park, MD, United States; Spanish Institute of Oceanography, Cádiz, Spain; University of Bonn, Bonn, Germany; Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; International Ocean Discovery Program/Texas A&M University, College Station, TX, United States; Geological Survey of Spain, Madrid, Spain; School of Biological Sciences, University of Adelaide, Australia; Camborne School of Mines, College of Engineering, Mathematics & Physical Sciences, University of Exeter, Penryn, United Kingdom; Earth and Environmental Studies, Montclair State University, Montclair, NJ, United States; College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, United States; College of Marine Science, University of South Florida, St. PetersburgFL, United States; GEOMAR Helmholtz Centre for Ocean Research, Kiel, German...
推荐引用方式 GB/T 7714	Pérez L.F.,Martos Y.M.,García M.,et al. Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382[J],2021,553.
APA	Pérez L.F..,Martos Y.M..,García M..,Weber M.E..,Raymo M.E..,...&the IODP Expedition 382 Scientists.(2021).Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382.Earth and Planetary Science Letters,553.
MLA	Pérez L.F.,et al."Miocene to present oceanographic variability in the Scotia Sea and Antarctic ice sheets dynamics: Insight from revised seismic-stratigraphy following IODP Expedition 382".Earth and Planetary Science Letters 553(2021).