globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.04.020
Scopus记录号: 2-s2.0-85018744933
论文题名:
Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean
作者: Channell J.E.T.; Vázquez Riveiros N.; Gottschalk J.; Waelbroeck C.; Skinner L.C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 167
起始页码: 1
结束页码: 13
语种: 英语
Scopus关键词: Atmospheric temperature ; Geomagnetism ; Glacial geology ; Isotopes ; Lithology ; Surface waters ; Antarctic ice core ; Geomagnetic excursions ; Laschamp excursions ; Marine isotope stages ; North Atlantic Ocean ; Radiocarbon dates ; Relative paleointensity ; Sea surface temperature (SST) ; Oceanography
英文摘要: Age models for new records of the Laschamp and Iceland Basin excursions from the eastern flank of the South Atlantic mid-ocean ridge (44.15°S, 14.22°W) are derived from radiocarbon dates, and from matching sea-surface temperature records to Antarctic (EPICA) air-temperature records from ice cores. The onset of the Laschamp excursion occurred during Antarctic Isotopic Maximum (AIM) 10, consistent with its occurrence during Greenland Interstadial 10. The end of the Laschamp excursion occurred prior to AIM 9 in Greenland Stadial 10. The age model is supported by synchroneity of directional and relative paleointensity manifestations of the Laschamp excursion in the marine core with peaks in EPICA10Be and nitrate flux. The Iceland Basin excursion is synchronous with the final phase of the transition from marine isotope stage (MIS) 7a to MIS 6e as recorded in the EPICA δD record. The onset of the Laschamp and Iceland Basin excursions, defined here by component inclinations >−40°, occurred at 41.4 ka and 190.0 ka, and durations are ∼1 kyr and ∼3.5 kyr, respectively, although these estimates depend on the criteria used to define the directional excursions. By comparison with Laschamp and Iceland Basin excursion records from the North Atlantic Ocean, the two excursions are synchronous at centennial timescales between the two hemispheres, based on synchronization of the GICC05 and AICC2012 age models for Greenland and Antarctic ice cores. © 2017 Elsevier Ltd
资助项目: We thank Kainian Huang for laboratory assistance, and Andrew Roberts for a thorough review of the manuscript. This research was supported by US National Science Foundation grants OCE-0850413 and EAR-1014506 (to JC), NERC grant NE/J010545/1 (to LCS), Gates Cambridge Scholarship (to JG), and AXA Research Fund Post-doctoral Fellowship (to NVR). CW acknowledges support from European Research Council grant ACCLIMATE/no 339108. This is LSCE contribution 5666.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59201
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作者单位: Department of Geological Sciences, POB 112120, University of Florida, Gainesville, FL, United States; Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CNRS-CEA-UVSQ, Université de Paris-Saclay, Gif-sur-Yvette, France; Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Baltzerstrasse 1+3, Bern, Switzerland

Recommended Citation:
Channell J.E.T.,Vázquez Riveiros N.,Gottschalk J.,et al. Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean[J]. Quaternary Science Reviews,2017-01-01,167
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