A mid-Holocene climate reconstruction for eastern South America

Abstract : The mid-Holocene (6000 calibrated years before present) is a key period in palaeoclimatology because incoming summer insolation was lower than during the late Holocene in the Southern Hemisphere, whereas the opposite happened in the Northern Hemisphere. However, the effects of the decreased austral summer insolation over South American climate have been poorly discussed by palaeodata syntheses. In addition, only a few of the regional studies have characterised the mid-Holocene climate in South America through a multiproxy approach. Here, we present a multiproxy compilation of mid-Holocene palaeoclimate data for eastern South America. We compiled 120 palaeoclimatological datasets, which were published in 84 different papers. The palaeodata analysed here suggest a water deficit scenario in the majority of eastern South America during the mid-Holocene if compared to the late Holocene, with the exception of northeastern Brazil. Low mid-Holocene austral summer insolation caused a reduced land-sea temperature contrast and hence a weakened South American monsoon system circulation. This scenario is represented by a decrease in precipitation over the South Atlantic Convergence Zone area, saltier conditions along the South American continental margin, and lower lake levels.
Mots-clés : AMERIQUE DU SUD
Document type :
Journal articles
Complete list of metadatas

Cited literature [155 references]  Display  Hide  Download

https://hal.ird.fr/ird-01458775
Contributor : Bruno Turcq <>
Submitted on : Wednesday, June 7, 2017 - 3:35:10 PM
Last modification on : Thursday, October 24, 2019 - 9:54:26 AM
Long-term archiving on: Friday, September 8, 2017 - 1:04:19 PM

File

cp-9-2117-2013.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Luciane Prado, Illaina Wainer, Christiano Chiessi, Marie-Pierre Ledru, Bruno Turcq. A mid-Holocene climate reconstruction for eastern South America. Climate of the Past, European Geosciences Union (EGU), 2013, 9 (5), pp.2117-2133. ⟨10.5194/cp-9-2117-2013⟩. ⟨ird-01458775⟩

Share

Metrics

Record views

328

Files downloads

276