DOI: 10.1016/j.quascirev.2015.10.010
Scopus记录号: 2-s2.0-84952052100
论文题名: Increased seasonality during the intensification of Northern Hemisphere glaciation at the Pliocene-Pleistocene boundary ~2.6 Ma
作者: Hennissen J.A.I. ; Head M.J. ; De Schepper S. ; Groeneveld J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 129 起始页码: 321
结束页码: 332
语种: 英语
英文关键词: North Atlantic
; Palaeoclimatology
; Paleoceanography
; Pliocene
; Quaternary
; Seasonality
Scopus关键词: Arctic vehicles
; Atmospheric temperature
; Climate change
; Drops
; Glacial geology
; Glaciers
; Submarine geophysics
; Surface properties
; Surface waters
; North Atlantic
; Palaeoclimatology
; Paleoceanography
; Pliocene
; Quaternary
; Seasonality
; Oceanography
; glaciation
; ice sheet
; marine isotope stage
; Northern Hemisphere
; paleoceanography
; paleoclimate
; planktonic foraminifera
; Pliocene-Pleistocene boundary
; reconstruction
; sea surface temperature
; seasonality
; Arctic Ocean
; Atlantic Ocean
; North Atlantic Current
; Foraminifera
; Globigerina bulloides
; Globigerinoides ruber
英文摘要: Near the Pliocene-Pleistocene (Neogene-Quaternary) boundary during Marine Isotope Stage (MIS) 104 at around 2.6 Ma, the intensification of Northern Hemisphere glaciation (iNHG) was marked by a southward shift of the North Atlantic Current and Arctic Front and a concurrent drop in sea surface temperature (SST) in the mid-latitudes of the North Atlantic. Here we evaluate two Mg/Ca-based sea-surface temperature reconstructions for the 2.78-2.52 Ma interval using the planktonic foraminifera Globigerina bulloides and Globigerinoides ruber (white) sensu stricto as the biotic carriers (SSTbul and SSTrub), and a reconstruction based on the alkenone saturation index (SSTalk). The Mg/Ca-based SST estimates begin to diverge from one another significantly during MIS G3 (~2.66 Ma), culminating during MIS 104 (~2.60 Ma), and remaining distinctly different for the remaining 80 kyr of the studied interval. The magnitude of this divergence (δSSTrub-bul) is caused mainly by a decrease in SSTbul, with SSTrub remaining relatively constant. We attribute this difference to a drop in SST during the early-spring blooming season of G. bulloides that was less pronounced during the late-summer blooming season of G. ruber. Using δSSTrub-bul as a seasonality indicator, we show that seasonality increased significantly owing to a drop in early spring temperatures from MIS 104 onwards, and peaked during glacial episodes. Maximum seasonality occurred during MIS 104 in coincidence with a major expansion of the circum-Atlantic ice sheets, particularly the North American ice sheet. This expansion appears to have had a critical influence on global climate and especially seasonality. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59776
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Earth Sciences, University of Toronto, 22 Russell Street, Toronto, ON, Canada; British Geological Survey, Nicker Hill, Keyworth, Nottingham, United Kingdom; Department of Earth Sciences, Brock University, 500 Glenridge Avenue, St. Catharines, ON, Canada; Uni Research Climate, Bjerknes Centre for Climate Research, Allégaten 55, Bergen, Norway; MARUM - Center for Marine Environmental Sciences, University of Bremen, Klagenfurter Strasse, Bremen, Germany
Recommended Citation:
Hennissen J.A.I.,Head M.J.,De Schepper S.,et al. Increased seasonality during the intensification of Northern Hemisphere glaciation at the Pliocene-Pleistocene boundary ~2.6 Ma[J]. Quaternary Science Reviews,2015-01-01,129