DOI: 10.1175/JCLI-D-15-0509.1
Scopus记录号: 2-s2.0-84959502055
论文题名: On the movements of the north atlantic subpolar front in the preinstrumental past
作者: Marchal O. ; Waelbroeck C. ; De Verdière A.C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 4 起始页码: 1545
结束页码: 1571
语种: 英语
Scopus关键词: Atmospheric temperature
; Isotherms
; Surface waters
; North Atlantic
; Paleoceanography
; Reconstruction method
; Recursive least square (RLS)
; Sea surface temperature (SST)
; Sediment records
; Standard deviation
; Subpolar fronts
; Oceanography
; air-sea interaction
; climate variation
; Holocene
; least squares method
; oceanic circulation
; paleoceanography
; paleoclimate
; polar front
; sea surface temperature
; Younger Dryas
; Atlantic Ocean
; Atlantic Ocean (North)
; Grand Banks
; Newfoundland Basin
英文摘要: Three sediment records of sea surface temperature (SST) are analyzed that originate from distant locations in the North Atlantic, have centennial-to-multicentennial resolution, are based on the same reconstruction method and chronological assumptions, and span the past 15 000 yr. Using recursive least squares techniques, an estimate of the time-dependent North Atlantic SST field over the last 15 kyr is sought that is consistent with both the SST records and a surface ocean circulation model, given estimates of their respective error (co)variances.Under the authors' assumptions about data andmodel errors, it is found that the 10°C mixed layer isotherm, which approximately traces the modern Subpolar Front, would have moved by ~15° of latitude southward (northward) in the eastern North Atlantic at the onset (termination) of the Younger Dryas cold interval (YD), a result significant at the level of two standard deviations in the isotherm position. In contrast, meridional movements of the isotherm in the Newfoundland basin are estimated to be small and not significant. Thus, the isotherm would have pivoted twice around a region southeast of the Grand Banks, with a southwest-northeast orientation during the warm intervals of the Boølling-Allerød and the Holocene and a more zonal orientation and southerly position during the cold interval of the YD. This study provides an assessment of the significance of similar previous inferences and illustrates the potential of recursive least squares in paleoceanography. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50087
Appears in Collections: 气候变化事实与影响
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作者单位: Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Laboratoire des Sciences du Climat et de l'Environnement, Saclay, France; Laboratoire de Physique des Océans, Brest, France
Recommended Citation:
Marchal O.,Waelbroeck C.,De Verdière A.C.. On the movements of the north atlantic subpolar front in the preinstrumental past[J]. Journal of Climate,2016-01-01,29(4)