DOI: 10.1016/j.quascirev.2017.11.009
Scopus记录号: 2-s2.0-85034769220
论文题名: Oceanic heat pulses fueling moisture transport towards continental Europe across the mid-Pleistocene transition
作者: Bahr A. ; Kaboth S. ; Hodell D. ; Zeeden C. ; Fiebig J. ; Friedrich O.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 179 起始页码: 48
结束页码: 58
语种: 英语
英文关键词: Foraminifers
; Micropaleontology
; North Atlantic
; Paleoceanography
; Pleistocene
Scopus关键词: Glaciers
; Moisture
; Stream flow
; Foraminifers
; Micropaleontology
; North Atlantic
; Paleoceanography
; Pleistocene
; Tropics
; atmospheric moisture
; foraminifera
; gyre
; ice sheet
; marine isotope stage
; micropaleontology
; Northern Hemisphere
; oceanic circulation
; paleoceanography
; Pleistocene
; thermocline
; valley glacier
; Atlantic Ocean
; Atlantic Ocean (North)
; Europe
; Iberian Margin
; Foraminifera
; Globorotalia inflata
英文摘要: The mid-Pleistocene Transition (MPT; approx. 1.2–0.7 Ma), is characterized by growing Northern Hemisphere ice sheets and the shift from a 41 kyr to a 100 kyr glacial-interglacial cyclicity. Concomitant to the growth of large ice sheets, atmospheric and oceanic circulation pattern have changed. One key feature of the North Atlantic is the wind-driven Subtropical Gyre, a major provider of heat and moisture for continental Europe. Here, we investigate changes in the strength and spatial configuration of the Subtropical Gyre during the MPT and its impact on the continental moisture balance. To reconstruct Subtropical Gyre dynamics, we conducted paired δ18O and Mg/Ca analyses on the deep-dwelling foraminifera Globorotalia inflata from Iberian Margin Site U1385 yielding thermocline temperature (Ttherm) variability between 1400 and 500 ka at the eastern boundary of the Subtropical Gyre. Long-term trends of Ttherm at Site U1385 oppose the North Atlantic climatic evolution of progressively intensified glacials during the MPT. Particularly, glacials MIS 20 and 18 were marked by warm thermocline waters off Iberia. We infer that a southward shift of the (sub)polar front displaced the source region of thermocline waters within the Subtropical Gyre from high to mid-latitudes. In addition, a strong Mediterranean Outflow Water production during the MPT caused the advection of warm waters to Iberia. Humid conditions during MIS 20 and 18 in SE Europe indicate that atmospheric moisture derived from this warm water might have been advected deep into continental Europe and contributed to enhanced growth of Alpine glaciers. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112340
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Earth Sciences, Heidelberg University, Im Neuenheimer Feld 234-236, Heidelberg, 69120, Germany; Institute of Earth Sciences, University of Frankfurt, Altenhöferallee 1, Frankfurt, 60438, Germany; Department of Geosciences, National Taiwan University, Roosevelt Road, 106, Taipei, Taiwan; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, Cambridgeshire CB2 3EQ, United Kingdom; PSL, IMCCE, Observatoire de Paris, 77 Av. Denfert-Rochereau, Paris, F-75014, France
Recommended Citation:
Bahr A.,Kaboth S.,Hodell D.,et al. Oceanic heat pulses fueling moisture transport towards continental Europe across the mid-Pleistocene transition[J]. Quaternary Science Reviews,2018-01-01,179