DOI: 10.5194/cp-11-915-2015
Scopus记录号: 2-s2.0-84934991007
论文题名: Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1
作者: Chiessi C.M. ; Mulitza S. ; Mollenhauer G. ; Silva J.B. ; Groeneveld J. ; Prange M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2015
卷: 11, 期: 6 起始页码: 915
结束页码: 929
语种: 英语
Scopus关键词: air temperature
; carbon dioxide
; Heinrich event
; Last Glacial
; sea surface temperature
; temporal variation
; thermal evolution
; thermohaline circulation
; warming
; Younger Dryas
; Atlantic Ocean
; Atlantic Ocean (South)
; South America
英文摘要: During Termination 1, millennial-scale weakening events of the Atlantic meridional overturning circulation (AMOC) supposedly produced major changes in sea surface temperatures (SSTs) of the western South Atlantic, and in mean air temperatures (MATs) over southeastern South America. It has been suggested, for instance, that the Brazil Current (BC) would strengthen (weaken) and the North Brazil Current (NBC) would weaken (strengthen) during slowdown (speed-up) events of the AMOC. This anti-phase pattern was claimed to be a necessary response to the decreased North Atlantic heat piracy during periods of weak AMOC. However, the thermal evolution of the western South Atlantic and the adjacent continent is so far largely unknown. Here we address this issue, presenting high-temporal-resolution SST and MAT records from the BC and southeastern South America, respectively. We identify a warming in the western South Atlantic during Heinrich Stadial 1 (HS1), which is followed first by a drop and then by increasing temperatures during the Bolling-Allerod, in phase with an existing SST record from the NBC. Additionally, a similar SST evolution is shown by a southernmost eastern South Atlantic record, suggesting a South Atlantic-wide pattern in SST evolution during most of Termination 1. Over southeastern South America, our MAT record shows a two-step increase during Termination 1, synchronous with atmospheric CO2 rise (i.e., during the second half of HS1 and during the Younger Dryas), and lagging abrupt SST changes by several thousand years. This delay corroborates the notion that the long duration of HS1 was fundamental in driving the Earth out of the last glacial. © Author(s) 2015. 资助项目: FAPESP, São Paulo Research Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49134
Appears in Collections: 气候变化与战略
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Recommended Citation:
Chiessi C.M.,Mulitza S.,Mollenhauer G.,et al. Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1[J]. Climate of the Past,2015-01-01,11(6)