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Climatic Change

, Volume 94, Issue 3–4, pp 399–408 | Cite as

Palaeolimnological studies and ancient maps confirm secular climate fluctuations in Amazonia

  • Rubén J. LaraEmail author
  • Marcelo C. L. Cohen
Article

Abstract

Secular Amazon discharge oscillations were investigated comparing information from ancient cartography, satellite images, palaeovegetation, sediments, anthropology and climate, focusing on the evolution of Marajó Island in the Amazon estuary. Four phases were identified. (1) 800–1200 a.d.: Amazon discharge increased gradually and eastern Marajó was a vegetation-free tidal plain with energy oscillations. (2) 1200–1350 a.d. was a dry period with lower river discharges, lower energy, increasing water salinities and maximum mangrove extension, coinciding with the extinction of chiefdoms in Marajó. (3) 1350–1540 a.d.: Amazon discharge increased rapidly, inducing a dominance of freshwater vegetation, inundation of east Marajó and likely a regional rise of relative sea-level (RSL). (4) 1540–1750 a.d.: RSL decreased, coinciding with an El Niño-related intense drought ca. 1600 a.d. Emergence of eastern Marajó was rapid and completed in the eighteenth century, under RSL stabilization to current values. The approach used provided evidence of intermittent large changes in Amazon climate, and can facilitate the prediction of future regional dynamics.

Keywords

Shuttle Radar Topographic Mission Accelerator Mass Spectrometry Pollen Accumulation Rate Palaeolimnological Study Increase Water Salinity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Zentrum für marine TropenökologieBremenGermany
  2. 2.Laboratory of Coastal DynamicsFederal University of ParáBelémBrazil

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