DOI: 10.1016/j.palaeo.2013.08.019
论文题名: Millennial- to centennial-scale changes in sea surface temperature in the tropical South Atlantic throughout the Holocene
作者: Santos T.P. ; Franco D.R. ; Barbosa C.F. ; Belem A.L. ; Dokken T. ; Albuquerque A.L.S.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392 起始页码: 1
结束页码: 8
语种: 英语
英文关键词: Atlantic meridional overturning circulation
; Modern analogue technique
; Oxygen stable isotopes
; Planktonic foraminifera assemblage
英文摘要: We performed δ18OC (Globigerinoides ruber, 250-300μm white) and SST (modern analogue technique) paleoceanographic reconstructions for the western tropical South Atlantic Ocean at the northeast Brazilian margin to assess millennial- to centennial-scale climatic shifts that may be propagated by the thermohaline circulation. The results show a progressive SST increase (~1°C) over the Holocene, with a prominent shift occurring during the mid-Holocene that may be linked to changes in insolation distribution. Furthermore, spectral and coherency analyses reveal several centennial- to millennial-scale modes of variability that are similar in both proxy records (4.1-3.8kyr, 1.5-1.0kyr, ~700yr, 570-560yr, ~390yr, ~350yr and ~330yr). Such variability could be the result of (1) solar-induced atmospheric changes at northern high latitudes (possibly propagated southward by the meridional overturning circulation and hence inducing shifts in tropical δ18Oc and sea surface temperature), and/or (2) salinity anomalies propagated from the Southern Atlantic Ocean and transmitted to the study site through the Agulhas Leakage. These climate oscillations may have had substantive effects on the Holocene climate system, especially over the tropical western South Atlantic Ocean and the South American continent. Our data show that the western tropical South Atlantic may respond to multi-centennial to millennial oscillations that are possibly triggered by external (solar) and internal (northern and southern high latitudes) climate forcing. Further investigations are necessary to illuminate the role of the western tropical South Atlantic in inter-hemispheric heat transfer. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69552
Appears in Collections: 过去全球变化的重建
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作者单位: Departamento de Geoquímica, Universidade Federal Fluminense, Outeiro de São João Batista, s/n, Niterói, Rio de Janeiro 24020-141, Brazil; Coordenação de Geofísica, Observatório Nacional, Rua General José Cristino 77, Rio de Janeiro 20921-400, Brazil; Bjerknes Centre for Climate Research, Allégaten 55, NO-5007 Bergen, Norway
Recommended Citation:
Santos T.P.,Franco D.R.,Barbosa C.F.,et al. Millennial- to centennial-scale changes in sea surface temperature in the tropical South Atlantic throughout the Holocene[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392