Timing and structure of Mega-SACZ events during Heinrich Stadial 1


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Gesine.Mollenhauer [ at ] awi.de

Abstract

Substantial increases in South American monsoon precipitation during Heinrich Stadials point 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 as well as the regional expression of Heinrich Stadials over tropical South America we present a multi-proxy paleo-precipitation reconstruction for Heinrich Stadial 1 (HS1), based on two precisely dated high-temporal resolution speleothem records in combination with marine records of terrestrial organic and inorganic matter input into the western equatorial Atlantic. Covering a wide portion of eastern South America monsoon domain the HS1 typifies a Mega SACZ episodes presenting a double plunge structured characterized by least two important events of increased monsoonal precipitation centered at 15.4 and 17.38 kyr B.P., here labeled as HS1a and HS1c, respectively, desiccant by a long-standing dry excursion ranging from 16.66 to 16.11 kyr BP, labeled as HS1b.



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ISI/Scopus peer-reviewed
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Published
Eprint ID
38339
DOI 10.1002/2015GL064048

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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. and dos Reis Sales, H. (2015): Timing and structure of Mega-SACZ events during Heinrich Stadial 1 , Geophysical Research Letters, n/a-n/a . doi: 10.1002/2015GL064048


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