Last millennium environmental changes and climate inferences in the Southeastern Atlantic forest, Brazil

Autor(es)

Pessenda, Luiz C. R. ^[1] ; Saia, Soraya E. M. G. ^[1] ; Gouveia, Susy E. M. ^[1] ; Ledru, Marie-Pierre ^[2] ; Sifeddine, Abdelfettah ^[3] ; Amaral, Paula G. C. ^[4] ; Bendassolli, Jose A. ^[5]

Afiliação do(s) autor(es)

^[1] CENA USP, Lab Carbono 14, BR-13416000 Piracicaba, SP - Brazil

^[2] IRD UR 032 Great Ice, Quito - Ecuador

^[3] IRD Inst Rech Dev, F-93143 Bondy - France

^[4] Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo - Brazil

^[5] CENA USP, Lab Isotopos Estaveis, BR-13400970 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 82, n. 3, p. 717-729, SEP 2010.
• Citações Web of Science: 10

Resumo

This study presents paleoenvironmental data based on pollen, elemental and isotopic compositions of organic matter (TOC, N, d13C and d15N) and 14C dating of 170 cm lake sediment record. Samplings have been made in Lagoa Grande at Parque Estadual Turístico do Alto Ribeira - PETAR, Southern São Paulo State, Southeastern Brazil. The variations in relative frequencies (in percentage) of arboreal pollen along the core range between 40 and 80%. The d13C values ranged from -23‰ to -30‰ and C/N of ~10 to 15, indicating the contribution of terrestrial C3 plants and algae in the sediment organic matter. The d15N results presented values from 3 to 4.5‰, also suggesting a mixture of algae and terrestrial C3 plants. The 14C dating indicates modern age for the shallow horizons to ~1030 BP at the base of the core. A probable wetter climate in the period of ~370 BP to ~340 BP was inferred from the data set, which corresponds to a part of the period covered by the Little Ice Age (LIA). (AU)

• Processo FAPESP: 02/08024-1 - Reconstrução paleoambiental (vegetação e clima) no Quartenário tardio com base em estudo multi/interdisciplinar no Vale do Ribeira (Sul do Estado de São Paulo)
• Beneficiário: Luiz Carlos Ruiz Pessenda
• Modalidade de apoio: Auxílio à Pesquisa - Regular