Reconstruction of the South Atlantic Subtropical Dipole index for the past 12,000 years from surface temperature proxy

Autor(es)

Wainer, Ilana ^[1] ; Prado, Luciana Figueiredo ^[1] ; Khodri, Myriam ^[2] ; Otto-Bliesner, Bette ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, BR-05508120 Sao Paulo - Brazil

^[2] UPMC, Univ Paris 04, CNRS, IRD MNHN, LOCEAN Lab, F-75005 Paris - France

^[3] Natl Ctr Atmospher Res, Climate & Global Dynam Div, Boulder, CO 80307 - USA

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 4, JUN 13 2014.
• Citações Web of Science: 5

Resumo

Climate indices based on sea surface temperature (SST) can synthesize information related to physical processes that describe change and variability in continental precipitation from floods to droughts. The South Atlantic Subtropical Dipole index (SASD) is based on the distribution of SST in the South Atlantic and fits these criteria. It represents the dominant mode of variability of SST in the South Atlantic, which is modulated by changes in the position and intensity of the South Atlantic Subtropical High. Here we reconstructed an index of the South Atlantic Ocean SST (SASD-like) for the past twelve thousand years (the Holocene period) based on proxy-data. This has great scientific implications and important socio-economic ramifications because of its ability to infer variability of precipitation and moisture over South America where past climate data is limited. For the first time a reconstructed index based on proxy data on opposite sides of the SASD-like mode is able to capture, in the South Atlantic, the significant cold events in the Northern Hemisphere at 12.9-11.6 kyr BP and 8.6-8.0 ky BP. These events are related, using a transient model simulation, to precipitation changes over South America. (AU)

• Processo FAPESP: 13/02111-4 - Investigação da evolução do oceano profundo na região do Atlântico Sul para o último milênio: impactos para a mudança do clima
• Beneficiário: Ilana Elazari Klein Coaracy Wainer
• Linha de fomento: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 13/11496-7 - Interação ar-mar na região do Atlântico Sul: mecanismos de variabilidade climática durante o último milênio
• Beneficiário: Luciana Figueiredo Prado
• Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado