DOI: 10.1002/2015GL064048
论文题名: Timing and structure of Mega-SACZ events during Heinrich Stadial 1
作者: Stríkis N.M. ; Chiessi C.M. ; Cruz F.W. ; Vuille M. ; Cheng H. ; De Souza Barreto E.A. ; Mollenhauer G. ; Kasten S. ; Karmann I. ; Edwards R.L. ; Bernal J.P. ; Sales H.D.R.
刊名: Geophysical Research Letters
ISSN: 0094-9524
EISSN: 1944-9255
出版年: 2015
卷: 42, 期: 13 起始页码: 5477
结束页码: 5484
语种: 英语
英文关键词: Heinrich Stadial
; paleoclimate
; South American Monsoon
; South Atlantic Convergence Zone
; speleothems
; stable isotope
Scopus关键词: Atmospheric thermodynamics
; Isotopes
; Heinrich Stadial
; Paleoclimates
; South American Monsoon
; South atlantic convergence zones
; Speleothems
; Stable isotopes
; Hydraulic structures
; heat transfer
; Heinrich event
; paleoclimate
; precipitation (climatology)
; reconstruction
; speleothem
; stable isotope
; timescale
; Atlantic Ocean
; Atlantic Ocean (Equatorial)
; Atlantic Ocean (North)
; Brazil
; South America
英文摘要: A substantial strengthening of the South American monsoon system (SAMS) during Heinrich Stadials (HS) points toward decreased cross-equatorial heat transport as the main driver of monsoonal hydroclimate variability at millennial time scales. In order to better constrain the exact timing and internal structure of HS1 over tropical South America, we assessed two precisely dated speleothem records from central-eastern and northeastern Brazil in combination with two marine records of terrestrial organic and inorganic matter input into the western equatorial Atlantic. During HS1, we recognize at least two events of widespread intensification of the SAMS across the entire region influenced by the South Atlantic Convergence Zone (SACZ) at 16.11-14.69kyr B.P. and 18.1-16.66kyr B.P. (labeled as HS1a and HS1c, respectively), separated by a dry excursion from 16.66 to 16.11kyr B.P. (HS1b). In view of the spatial structure of precipitation anomalies, the widespread increase of monsoon precipitation over the SACZ domain was termed Mega-SACZ. Key Points Reconstruction of the timing and structure of HS1-related SAMS precipitation During HS1 a widespread increase of SAMS rainfall is termed as Mega SACZ SAMS responds almost instantaneously to cooling over North Atlantic. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938201229&doi=10.1002%2f2015GL064048&partnerID=40&md5=b36cde9b9f4d92ea33b8f6de5d83d10e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9139
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil
Recommended Citation:
Stríkis N.M.,Chiessi C.M.,Cruz F.W.,et al. Timing and structure of Mega-SACZ events during Heinrich Stadial 1[J]. Geophysical Research Letters,2015-01-01,42(13).