DOI: 10.1016/j.epsl.2019.115936
论文题名: Millennial-scale hydrographic changes in the northwestern Pacific during marine isotope stage 19: Teleconnections with ice melt in the North Atlantic
作者: Haneda Y. ; Okada M. ; Kubota Y. ; Suganuma Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531 语种: 英语
英文关键词: Chiba composite section
; climatic teleconnection
; Kuroshio Extension Front
; marine isotope stage (MIS) 19
; northwestern Pacific Ocean
; oxygen stable isotope
Scopus关键词: Climate change
; Glacial geology
; Incident solar radiation
; Ocean currents
; Water
; Composite sections
; Kuroshio Extension
; Marine isotope stages
; Oxygen stable isotopes
; Pacific ocean
; Teleconnections
; Isotopes
; climate variation
; Holocene
; ice cover
; interglacial
; marine isotope stage
; oxygen isotope
; paleoceanography
; paleoclimate
; paleoenvironment
; periodicity
; reconstruction
; stable isotope
; teleconnection
; temporal variation
; Atlantic Ocean
; Atlantic Ocean (North)
; Kuroshio Current
; Pacific Ocean
; Pacific Ocean (Northwest)
; Foraminifera
英文摘要: Marine isotope stage (MIS) 19 has been suggested as the best orbital analogue of the present interglacial period. Thus, its paleoenvironmental reconstruction will provide valuable information on future climate change, excluding anthropogenic impacts. The Kuroshio Current, the largest western boundary current in the northwestern Pacific, transports large amounts of heat and water poleward and strongly influences both East Asian and global climates. However, the responses of the Kuroshio Current to the variable intensity of the Atlantic meridional overturning circulation (AMOC) under this orbital configuration remain unknown. Here, we provide new centennial-scale resolution oxygen isotope (δ18O) records throughout MIS 19 using benthic, as well as subsurface and surface planktonic foraminifera from the Chiba composite section, a marine succession sequence in central Japan, to reconstruct detailed paleoceanographic variations in the northwestern Pacific and reveal the response of the Kuroshio Current to climate variability in the North Atlantic under this orbital configuration. The vertical water temperature structure and its gradient (ΔT) based on δ18O profiles elucidates the latitudinal oscillations of the Kuroshio Extension Front (KEF) on a millennial scale during the late MIS 19 and MIS 20–19 transition in association with AMOC disruption/reactivation due to freshwater discharges into the North Atlantic. The power spectra of the surface δ18O and ΔT show half-precession periodicity throughout MIS 19, which probably originated from equatorial insolation at equinoxes co-occurring with the orbital perihelion. This periodicity was especially strong during MIS 19c, during which paleoceanographic records from the North Atlantic show minor variations in the AMOC and freshwater discharge. Our results suggest that millennial-scale oceanographic variation and stability along the KEF under this orbital configuration are influenced by both North Atlantic climate variability and tropical insolation forcing. © 2019 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159574
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo, 190-8518, Japan; Department of Environmental Science, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki, 310-8512, Japan; Department of Geology and Paleontology, National Museum of Nature and Science, 4-1-1 Amakubo, Tsukuba, Ibaraki, 305-0005, Japan; Department of Polar Science, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies (SOKENDAI), Midori-cho 10-3, Tachikawa, Tokyo, 190-8518, Japan
Recommended Citation:
Haneda Y.,Okada M.,Kubota Y.,et al. Millennial-scale hydrographic changes in the northwestern Pacific during marine isotope stage 19: Teleconnections with ice melt in the North Atlantic[J]. Earth and Planetary Science Letters,2020-01-01,531