TY - JOUR
T1 - Holocene sea-surface temperatures and related coastal upwelling regime recorded by vermetid assemblages, southeastern Brazil (Arraial do Cabo, RJ)
AU - Areias, Camila
AU - Spotorno-Oliveira, Paula
AU - Bassi, Davide
AU - Iryu, Yasufumi
AU - Nash, Merinda
AU - Castro, João Wagner de Alencar
AU - Tâmega, Frederico Tapajós de Souza
N1 - Funding Information:
We are grateful to the Brazilian financial agencies Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES for providing the Master fellowships CAO and Post-doc fellowships FTST (Process Number: 88882.314604/2019-01) and PSO (Process Number: 88887.320380/2019-00). Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq (Projeto variações do nível relativo do mar no litoral do estado do Rio de Janeiro. Case No. 477749/2014 ) and PPGL , UFRJ for the financial support. Instituto Chico Mendes de Conservação da Biodiversidade for research licence SISBIO no 44575–3. We are also grateful to Prof. Egberto Pereira from Universidade do Estado do Rio de Janeiro, Laboratório de Estratigrafia Quimica Orgânica, Brazil; Aldo Shemesh from Weizmann Institute, Environmental Sciences, Rehovot, Israel for isotopic analysis; Hélisson Santos from Centro de Tecnologia Mineral (CETEM) for XRD analysis. Rudmar Krumerick and Caroline Ruas from CEME-SUL, FURG are thanked for the SEM images. Daniel Souza dos Santos for helping at the field work. Banco Nacional de Dados Oceanográficos (BNDO), Diretoria de Hidrografia e Navegação (DHN), Marinha do Brasil for tide data. This investigation was financially supported in part by local research funds (FIR2018 at the University of Ferrara, DB) and represents a scientific contribution of the Project MIUR–Dipartimenti di Eccellenza 2018–2022 and to PRIN 2017RX9XXXY (Biota resilience to global change: biomineralization of planktic and benthic calcifiers in the past, present and future).
Funding Information:
We are grateful to the Brazilian financial agencies Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES for providing the Master fellowships CAO and Post-doc fellowships FTST (Process Number: 88882.314604/2019-01) and PSO (Process Number: 88887.320380/2019-00). Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq (Projeto variações do nível relativo do mar no litoral do estado do Rio de Janeiro. Case No. 477749/2014) and PPGL, UFRJ for the financial support. Instituto Chico Mendes de Conservação da Biodiversidade for research licence SISBIO no 44575–3. We are also grateful to Prof. Egberto Pereira from Universidade do Estado do Rio de Janeiro, Laboratório de Estratigrafia Quimica Orgânica, Brazil; Aldo Shemesh from Weizmann Institute, Environmental Sciences, Rehovot, Israel for isotopic analysis; Hélisson Santos from Centro de Tecnologia Mineral (CETEM) for XRD analysis. Rudmar Krumerick and Caroline Ruas from CEME-SUL, FURG are thanked for the SEM images. Daniel Souza dos Santos for helping at the field work. Banco Nacional de Dados Oceanográficos (BNDO), Diretoria de Hidrografia e Navegação (DHN), Marinha do Brasil for tide data. This investigation was financially supported in part by local research funds (FIR2018 at the University of Ferrara, DB) and represents a scientific contribution of the Project MIUR–Dipartimenti di Eccellenza 2018–2022 and to PRIN 2017RX9XXXY (Biota resilience to global change: biomineralization of planktic and benthic calcifiers in the past, present and future). We thank Daniel Killam and an anonymous reviewer for numerous constructive suggestions that improved the manuscript.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/7
Y1 - 2020/7
N2 - In places where ocean currents cause upwelling, nearshore sea-surface temperatures (SST) are often cooler than nearby offshore waters. In the Arraial do Cabo Bay coast upper Holocene aragonitic vermetids are represented by monospecific clusters of overgrowing Petaloconchus varians occurring in supratidal/intertidal carbonate and mixed siliciclastic-carbonate deposits. Based on stable isotope composition (δ13C, δ18O) of fossil vermetid shells, radiocarbon ages and altimetric survey, the upper Holocene upwelling system of the Cabo Frio area (southeastern Brazil, Rio de Janeiro) is assessed. In the studied region, at 3700 cal. years BP the maximum relative sea level (RSL) was +4.0 m with a SST of 20.7 °C. Subsequently, vermetid-based SST decreased from ~22.8 to ~17 °C (at ~3300 cal. years BP), with the coldest temperatures recording a strong upwelling event at around 2000 cal. years BP when the RSL was at +2 m. The intensification in upwelling water masses is identified by the 13C enrichment, along with higher δ18O, in the vermetid shells. The decreasing SST trend assessed from ~3300 to ~2000 cal. years BP can be related to more frequent South Atlantic Coastal Water intrusions on the surface layer in the mid-shelf, increasing the nutrient concentration in the upper layer. From ~1900 to ~1300 cal. years BP, a higher SST up to ~21 °C occurred during the continuous sea-level fall.
AB - In places where ocean currents cause upwelling, nearshore sea-surface temperatures (SST) are often cooler than nearby offshore waters. In the Arraial do Cabo Bay coast upper Holocene aragonitic vermetids are represented by monospecific clusters of overgrowing Petaloconchus varians occurring in supratidal/intertidal carbonate and mixed siliciclastic-carbonate deposits. Based on stable isotope composition (δ13C, δ18O) of fossil vermetid shells, radiocarbon ages and altimetric survey, the upper Holocene upwelling system of the Cabo Frio area (southeastern Brazil, Rio de Janeiro) is assessed. In the studied region, at 3700 cal. years BP the maximum relative sea level (RSL) was +4.0 m with a SST of 20.7 °C. Subsequently, vermetid-based SST decreased from ~22.8 to ~17 °C (at ~3300 cal. years BP), with the coldest temperatures recording a strong upwelling event at around 2000 cal. years BP when the RSL was at +2 m. The intensification in upwelling water masses is identified by the 13C enrichment, along with higher δ18O, in the vermetid shells. The decreasing SST trend assessed from ~3300 to ~2000 cal. years BP can be related to more frequent South Atlantic Coastal Water intrusions on the surface layer in the mid-shelf, increasing the nutrient concentration in the upper layer. From ~1900 to ~1300 cal. years BP, a higher SST up to ~21 °C occurred during the continuous sea-level fall.
KW - Brazil
KW - Holocene
KW - Palaeotemperature
KW - Stable isotopes
KW - Upwelling current
KW - Vermetids
UR - http://www.scopus.com/inward/record.url?scp=85083080358&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85083080358&partnerID=8YFLogxK
U2 - 10.1016/j.margeo.2020.106183
DO - 10.1016/j.margeo.2020.106183
M3 - Article
AN - SCOPUS:85083080358
VL - 425
JO - Marine Geology
JF - Marine Geology
SN - 0025-3227
M1 - 106183
ER -