Holocene paleoreconstruction of the southwestern Atlantic ocean: a multiproxy approach of the paleoclimatic, paleoceanography and paleotemperature variability (2024)
- Authors:
- Autor USP: SANTOS, FELIPE RODRIGUES DOS - IO
- Unidade: IO
- Sigla do Departamento: IOF
- DOI: 10.11606/T.21.2024.tde-29072024-150521
- Subjects: OCEANOGRAFIA QUÍMICA; HOLOCENO
- Language: Inglês
- Abstract: The Holocene period exhibited crucial climatic features that facilitated the expansion and advancement of human civilization. Many siliciclastic continental margins have specific bathymetric and depositional characteristics that cause the formation of mud deposits that provide sedimentary records capable of recording climatic and oceanographic variations over geological periods. An understanding of the mechanisms behind climate fluctuations and the identification of cyclical events in the geological archives from this era can provide insights into the sensitivity, frequency, and likelihood of future climate change at local, regional, and global scales. To study the paleoenvironmental variations in the southern Brazilian continental shelf, two high-resolution sediment records (#557: 33.79°S - 52.21°W 61m depth, #561: 33.27°S - 51.3°W 90 m depth) were used in association with sedimentological, elemental, isotopic and molecular proxies (grain-size, total organic carbon, δ13C, n-alkanes, alkenones, and δ13C-alkanes) to reconstruct the paleoclimate, paleoceanography, and paleotemperature variations throughout the Holocene, understanding the respective forcing mechanisms that has triggered SST variations in the Southwestern Atlantic Ocean (Chapter 2) as well as the input, transport, and deposition dynamic of terrigenous material, shifts in vegetation, and variations in hydrological patterns (Chapter 3). The SST-UK37 variations in our records can be attributed to the interaction between the warm, salty, and nutrient-poor Subtropical Surface Water (STSW) and the cold, fresh, and nutrient-rich Subantarctic Surface Water (SASW). In the early Holocene, the rise in relative sea level (RSL) and the movement of the northern boundary of the subtropical westerly winds (SWW) were the primary factors influencing the latitudinal variation of the Subtropical Shelf Front (STSF). (Continue)(Continuation)Once the relative sea level (RSL) stabilized around 5000 cal BP, the northward movement of the Plata Plume Water (PPW) became a noticeable characteristic of sedimentation and circulation in the inner shelf of southeast South America. This movement directly affected the dynamics of ΣC37Alk and SST-UK37. The RSL rise in the early Holocene is also the primary factor influencing the sedimentary organic matter. This is accompanied by a notably weaker South American Monsoon System (SAMS) and reduced precipitation over the La Plata River (LPR) region, with the terrigenous organic material in this period originating from both the LPR and small rivers from the neighboring continent. During the mid-Holocene, a higher RSL caused a trapping of sediments LPR estuary resulting in a low accumulation of terrigenous material in the southern Brazilian shelf. From 6000 cal yrs BP, a shift in the local origin of terrigenous organic matter coincides with a decrease in RSL and an influence of Plata Plume Water (PPW) in the region. During the late Holocene, with a stabilized RSL, the highest levels of southern summer insolation occurred, an increase in the South American Monsoon System (SAMS) and the establishment of El Niño-Southern Oscillation (ENSO), a greater rainfall regime was established in southeastern South America, noticeable at 4000 cal yrs BP and intensified after 2000 cal yrs BP.
- Imprenta:
- Data da defesa: 24.05.2024
- Este artigo possui versão em acesso aberto
- URL de acesso aberto
- PDF de acesso aberto
- Versão do Documento: Versão publicada (Published version)
-
Status: Artigo publicado em periódico de acesso aberto (Gold Open Access) -
ABNT
SANTOS, Felipe Rodrigues dos. Holocene paleoreconstruction of the southwestern Atlantic ocean: a multiproxy approach of the paleoclimatic, paleoceanography and paleotemperature variability. 2024. Tese (Doutorado) – Universidade de São Paulo, São Paulo, 2024. Disponível em: https://doi.org/10.11606/T.21.2024.tde-29072024-150521. Acesso em: 14 mar. 2026. -
APA
Santos, F. R. dos. (2024). Holocene paleoreconstruction of the southwestern Atlantic ocean: a multiproxy approach of the paleoclimatic, paleoceanography and paleotemperature variability (Tese (Doutorado). Universidade de São Paulo, São Paulo. Recuperado de https://doi.org/10.11606/T.21.2024.tde-29072024-150521 -
NLM
Santos FR dos. Holocene paleoreconstruction of the southwestern Atlantic ocean: a multiproxy approach of the paleoclimatic, paleoceanography and paleotemperature variability [Internet]. 2024 ;[citado 2026 mar. 14 ] Available from: https://doi.org/10.11606/T.21.2024.tde-29072024-150521 -
Vancouver
Santos FR dos. Holocene paleoreconstruction of the southwestern Atlantic ocean: a multiproxy approach of the paleoclimatic, paleoceanography and paleotemperature variability [Internet]. 2024 ;[citado 2026 mar. 14 ] Available from: https://doi.org/10.11606/T.21.2024.tde-29072024-150521 - Reconstrução paleoceanográfica ao longo dos últimos 3000 anos na plataforma continental sudeste do Brasil: uma abordagem multiproxy em testemunho de alta resolução
- Pollution assessment and ecological risk of organic contaminants in a river-estuary of the northeastern Brazilian semi-arid: Traditional and emerging contaminants unraveling rural and urban activities
- Geochemical mapping of modern sedimentary organic matter deposited in a World Heritage subtropical estuary affected by human activities: stable isotopes and molecular approaches
- Distributions and sources of bulk organic matter from surface sediments along the Southwestern Atlantic Margin
- Unusual natural polycyclic aromatic hydrocarbons in sediment cores of an Amazon estuary
- Historical deposition of PAHs in mud depocenters from the Southwestern Atlantic continental shelf: the influence of socio-economic development and coal consumption in the last century
- High-resolution UK’37 sea surface temperature reconstruction in the southwestern Atlantic Ocean during the Holocene
- Anthropogenic pollutants in the Southwestern Atlantic Ocean slope: Is the Santos Bifurcation region a potential sink for organic contaminants?
- Organic contaminants and trace metals in the western South Atlantic upper continental margin: Anthropogenic influence on mud depocente
- Late-Holocene paleoreconstruction of the Southwestern Atlantic Ocean: A multiproxy understanding of the paleoclimatic, paleoproductivity and paleotemperature variability
Informações sobre a disponibilidade de versões do artigo em acesso aberto coletadas automaticamente via oaDOI API (Unpaywall).
How to cite
A citação é gerada automaticamente e pode não estar totalmente de acordo com as normas
