Spatial-temporal heterogeneity in a small lake and its implication for paleoclimate reconstruction

Autor(es)

Rawat, Suman ^[1] ; Gupta, Anil K. ^[2] ; Srivastava, Priyeshu ^[3] ; Sangode, S. J. ^[4] ; Jovane, Luigi ^[3]

Afiliação do(s) autor(es)

^[1] Wadia Inst Himalayan Geol, 33 GMS Rd, Dehra Dun 248001, Uttarakhand - India

^[2] Indian Inst Technol, Dept Geol & Geophys, Kharagpur 721302, W Bengal - India

^[3] Univ Sao Paulo, Inst Oceanog, Praca Oceanog 191, BR-05508120 Sao Paulo - Brazil

^[4] Savitribai Phule Pune Univ, Dept Geol, Pune 411007, Maharashtra - India

• Tipo de documento: Artigo Científico
• Fonte: LIMNOLOGY; v. 23, n. 1 JUL 2021.
• Citações Web of Science: 0

Resumo

Lakes provide continuous records of past regional and global climate. Most studies utilize single trench section dig from the lake shore margins or from single core in the central part/depocenter of the lakes for paleoclimate reconstruction. These reconstructions are based on the assumption of homogenous sedimentation across the lake. However, single core approach for paleoclimate reconstruction is often debated due to inter-site spatial and temporal variations in sedimentation and proxy responses. Therefore, in the present study, we explored the spatial-temporal heterogeneity in a small post-glacial lake of the Lahaul Himalaya and its influence on paleoclimate reconstruction. The depocenter of lake received similar to 2.5 times higher average sedimentation compared to the shore margin. Despite the distinct sedimentation rate in depocenter and shore margin, environmental magnetic and total organic carbon (TOC) records showed similar environmental signals over equivalent time periods. The depocenter core provided high-resolution lacustrine environment, whereas the marginal trench recorded major shifts in paleoclimate over a longer time scale. New multi-proxy data showed strengthened Indian summer monsoon (ISM) during medieval climate anomaly (MCA) and weakened ISM during little ice age (LIA) in the NW Himalaya. (AU)

• Processo FAPESP: 16/24946-9 - Mudanças do nível do mar e o Sistema Monçônico Global: avaliação através de testemunhos marinhos no Brasil
• Beneficiário: Luigi Jovane
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 19/11364-0 - Investigando a acidificação dos oceanos durante o final do Maastrichtiano e início do Daniano a partir de seções marinhas do Brasil e da Índia: Implicações para o impacto versus o papel do vulcanismo na extinção em massa do limite do Cretáceo-Paleogeno.
• Beneficiário: Priyeshu Srivastava
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado