Coastal dunefields of south Brazil as a record of climatic changes in the South American Monsoon System

Autor(es)

Mendes, Vinicius Ribau ^[1] ; Fonseca Giannini, Paulo Cesar ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Geol Sedimentar & Ambiental, Inst Geociencias, BR-05508 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Geomorphology; v. 246, p. 22-34, OCT 1 2015.
• Citações Web of Science: 2

Resumo

Southern Brazil coastal dunefields are undergoing a stabilization process that appears to be influenced by climate change. Although this process is relatively well known in the literature, the precise climatic mechanisms involved were not fully understood until now. Here, we propose anew method for integrating meteorological data with dunefield morphology analyses by remote sensing to better understand the impacts of recent climate change on dunefield dynamics. Based on this approach, three successive morphological phases were identified for the Santa Catarina central coast dunefields since 1938: (i) increased sand saturation; (ii) reduced sand saturation with consequent accelerated dune migration; and (iii) decelerated dune migration with trends of stabilization by the vegetation cover. For the coastal dunefields of southern Brazil, the stabilization process can be explained mechanistically by an increase in precipitation and decrease of wind power, both of which were correlated with the intensification of the South American Monsoon System. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/54232-4 - Morfodinâmica e cronologia de sistemas deposicionais eólicos no Quaternário do Brasil
• Beneficiário: Paulo César Fonseca Giannini
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 09/53988-8 - EMU: aquisição de sistema de datação por luminescência e de microamostrador de precisão, para o estudo de mudanças ambientais no Quaternário
• Beneficiário: Paulo César Fonseca Giannini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários