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Coral-based climate records from tropical South Atlantic: 2009/2010 ENSO event in C and O isotopes from Porites corals (Rocas Atoll, Brazil).
Pereira, Natan S; Sial, Alcídes N; Kikuchi, Ruy K P; Ferreira, Valderez P; Ullmann, Clemens V; Frei, Robert; Cunha, Adriana M C.
Afiliação
  • Pereira NS; Universidade Federal de Pernambuco, Recife, PE, Brasil.
  • Sial AN; Universidade Federal de Pernambuco, Recife, PE, Brasil.
  • Kikuchi RK; Departamento de Geociências, Universidade Federal da Bahia, Salvador, BA, Brasil.
  • Ferreira VP; Universidade Federal de Pernambuco, Recife, PE, Brasil.
  • Ullmann CV; Department of Geography and Geology & Nordic Center for Earth Evolution, University of Copenhagen, Copenhagen, Denmark.
  • Frei R; Department of Geography and Geology & Nordic Center for Earth Evolution, University of Copenhagen, Copenhagen, Denmark.
  • Cunha AM; Departamento de Educação, Universidade do Estado da Bahia, Paulo Afonso, BA, Brasil.
An Acad Bras Cienc ; 87(4): 1939-57, 2015.
Article em En | MEDLINE | ID: mdl-26536856
Coral skeletons contain records of past environmental conditions due to their long life span and well calibrated geochemical signatures. C and O isotope records of corals are especially interesting, because they can highlight multidecadal variability of local climate conditions beyond the instrumental record, with high fidelity and sub-annual resolution. Although, in order to get an optimal geochemical signal in coral skeleton, sampling strategies must be followed. Here we report one of the first coral-based isotopic record from the Equatorial South Atlantic from two colonies of Porites astreoides from the Rocas Atoll (offshore Brazil), a new location for climate reconstruction. We present time series of isotopic variation from profiles along the corallite valley of one colony and the apex of the corallite fan of the other colony. Significant differences in the isotopic values between the two colonies are observed, yet both record the 2009/2010 El Niño event - a period of widespread coral bleaching - as anomalously negative δ18O values (up to -1 permil). δ13C is found to be measurably affected by the El Niño event in one colony, by more positive values (+0.39 ‰), and together with a bloom of endolithic algae, may indicate physiological alteration of this colony. Our findings indicate that corals from the Rocas Atoll can be used for monitoring climate oscillations in the tropical South Atlantic Ocean.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Isótopos de Oxigênio / Mudança Climática / Isótopos de Carbono / Monitoramento Ambiental / Recifes de Corais País/Região como assunto: America do sul / Brasil Idioma: En Revista: An Acad Bras Cienc Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Isótopos de Oxigênio / Mudança Climática / Isótopos de Carbono / Monitoramento Ambiental / Recifes de Corais País/Região como assunto: America do sul / Brasil Idioma: En Revista: An Acad Bras Cienc Ano de publicação: 2015 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil