Marcus Vinicius Licínio

Universidade do Estado do Rio de Janeiro

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Heitor Evangelista

Universidade do Estado do Rio de Janeiro

Sérgio J. Gonçalves

Universidade do Estado do Rio de Janeiro

Antônio Carlos de Freitas

Universidade Federal de Pernambuco

Johanna Slaets

International Atomic Energy Agency

Alejandra Castillo

Austral University of Chile

Anna B.J. Oaquim

Universidade do Estado do Rio de Janeiro

Gerd Dercon

International Atomic Energy Agency

Marília Harumi Shimizu

National Institute for Space Research

Roman Gruber

International Atomic Energy Agency

СР

С. Р. Веркулич

Arctic and Antarctic Research Institute

Cooperative Institutions

Universidade do Estado do Rio de Janeiro

Universidade Federal Fluminense

Universidade Federal do Rio de Janeiro

Universidade de São Paulo

Universidade Federal do Espírito Santo

Instituto de Geociencias

Universidade Federal do Rio Grande do Sul

Universidade Federal do Rio Grande

Centre National de la Recherche Scientifique

Instituto Federal do Espírito Santo

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A synchronous atmosphere-cryosphere-land response to climate on the northern Antarctic Peninsula since the mid-Holocene

Research Square (Research Square) (2023)

Heitor Evangelista С. Р. Веркулич Bulat Mavlyudov Mariza Pereira de Souza Echer Marcus Vinicius Licínio

Abstract West Antarctica plays a pivotal role in sea level rise in projected scenarios with global socioenvironmental and economic consequences. Therefore, describing its recent and past climate history and changes is essential for identifying the main climate controls and past responses. To better understand the climatic sensitivity of this region, we analyzed sedimentary records from newly surveyed proglacial lacustrine profiles dated from the middle Holocene to the present on the North Antarctic Peninsula. We combined atmosphere-glacier-land databases that evidenced a close coupling among these compartments during intense melting events. Our analyses furthermore suggest that a short Neoglacial phase from ∼1,500–2,000 kyr BP until the onset of the 20th century was possibly influenced by a combined long-term decline in total solar irradiance, Andean volcanism and ENSO.

Peninsula

10.21203/rs.3.rs-3601682/v4

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Distribution of 232Th, 238U & 40K and variation of gamma dose rate in a Brazilian southeastern beach

6th International Congress of the Brazilian Geophysical Society (2003)

Alexandre Santos de Alencar Marcus Vinicius Licínio Aldrey Costa-Gonçalves Antônio Carlos de Freitas

The activities concentration (Bqkg-1) of 232Th, 238U and 40K in sand samples profiles (0-10, 10-20 and 20-30cm) of Preta Beach in Ilha Grande, Rio de Janeiro - Brazil was measured from gamma ray spectrometry, during a period of twelve months. The activities concentration in the three different profiles ranged of 92-438 for 232Th, 46-277 for 238U and 44-379 for 40K. The gamma dose rate measured in situ, at 1m above the ground level was 125±11nGy h-1, corresponding to an annual effective dose of 0.15±0.01 mSv y-1, it ranging from 0.07 to 0.28 mSv y-1. The primordial radionuclide 232Th was the main contributor for the gamma dose rate in the Preta Beach, during the period studied. The results were compared with other studies realized in global scale.

Gamma ray spectrometry

Dose rate

10.3997/2214-4609-pdb.168.arq_594

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A synchronous atmosphere-cryosphere-land response to climate on the northern Antarctic Peninsula since the mid-Holocene

Research Square (Research Square) (2023)

Heitor Evangelista С. Р. Веркулич Bulat Mavlyudov Mariza Pereira de Souza Echer Marcus Vinicius Licínio

Peninsula

10.21203/rs.3.rs-3601682/v5

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Coastal wetland responses to a century of climate change in northern Sahara, Morocco

Limnology and Oceanography (2021)

Juliana Nogueira Heitor Evangelista Lhoussaine Bouchaou Luciane Silva Moreira Abdelfettah Sifeddine

Abstract Coastal wetlands are highly sensitive to changes occurring at the coastline. It is critically important to determine region‐specific projections for these areas due to their specificities and vulnerabilities to climate change. This work aimed to value the impacts of recent climate changes at West Africa Sahara coastland, southern Morocco, at Khnifiss Lagoon. We have applied a combined approach using remote sensing techniques and environmental reconstructions based on high‐resolution analysis of sediment cores, covering the current warm period. Remote sensing highlighted changes to the lagoon inlet, accompanied by a greater meandering character of the tidal channels. As a response, the sediment cores have recorded a predominant vegetation substitution due to changes in the tidal limit, and an increase in organic carbon accumulation was observed. For the current climatology, during positive phases of the North Atlantic Oscillation, winds reaching the coast strengthen in an east‐to‐west direction. In the Khnifiss Lagoon, whose inlet is dominated by the ebb tide, the intensity and direction of the winds on the coast at surface level modifies its connection to the ocean by increasing sediment transport toward the interior of the lagoon. Locally biological responses to wind intensification, and possibly sea‐level rise, exemplify the lagoon sensitivity to large‐scale processes. Coastal vegetated wetlands are considered to be highly dynamic environments. However, we expect a loss of the upper tidal vegetation due to boundary conditions limiting the accommodation space in this arid environment in a possible future scenario of continuously inland tidal line displacement.

Tidal range

10.1002/lno.11992

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Dose estimation and calculation of radiological hazard index at Doce River / Brazil due to Fundão dam rupture

Brazilian Journal of Radiation Sciences (2018)

Roberto Ferreira Carmo Heitor Evangelista José Ubiratan Delgado Octávio Luis Trindade Filho Araceli Verônica Flores Nardy Ribeiro

The monitoring of the activity of radionuclides of natural occurrence as 238U, 232Th, 226Ra, 40K including 210Pb is important to assess the radiological impact and human exposure due to radioactivity in estuaries. In the case of the Doce River, a mining activity and a strong use of soil on its banks continued for decades. This river suffered a serious accident at 2015 due to a rupture of a tailings dam in your upper course, characterizing it as the biggest Southern Hemisphere accident in the mineral area. This work determined the radioactivity levels in sediments of the Doce River estuary from samples collected before and after the rupture. The concentrations analyzed by gamma spectrometry with Ge detector for 238U, 232Th, 226Ra, including 210Pb and 40K in sediments, ranged from [(15.86 ± 0.99), (19.83 ± 1.10), (55.65 ± 7.71), (11.58 ± 4.43) and (237.15 ± 8.70)] Bq kg-1 before the breakup, respectively, for [(20.70 ± 0.99) (31.82 ± 1.30), (90.84 ± 8.50) (11.41 ± 4.04) and ( 197.50 ± 7.62)] Bq kg-1, in the period after the breakup, respectively. This study identified an increase in 238U, 232Th and 226Ra concentrations after the rupture. It was evaluated the annual effective dose equivalent to the local population and the radiological risks, both internal and external, second model UNSCEAR. The results obtained for the radiological risk on the local population were compared with the world values obtained in similar environments for these radionuclides.

Radium

10.15392/bjrs.v6i2.350

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TENDÊNCIAS HISTÓRICAS DAS TAXAS DE SEDIMENTAÇÃO E ACÚMULO DE ELEMENTOS TRAÇO NO BAIXO CURSO DO RIO DOCE, ESPÍRITO SANTO, BRASIL

CADERNOS DE GEOCIÊNCIAS (2015)

Marcus Vinicius Licínio Rowenna Tonani Leão Felipe Guimarães Gaudereto Aldrey Costa-Gonçalves Sambasiva Rao Patchneelan

A bacia hidrografica do rio Doce apresenta uma historia de intensa ocupacao humana e variedade de atividades economicas e consequente poluicao quimica. Este trabalho tem como objetivo determinar a concentracao de elementos traco em sedimentos (Cu, Zn, Cr, Pb, Fe, Mn e Ni) no baixo curso da bacia do Rio Doce. Foram coletados tres testemunhos sedimentares em diferentes pontos da bacia: um a montante, na frente e outro a jusante da cidade de Linhares. As taxas de sedimentacao entre 0,12 e 2,87 cm ano -1 foram definidas pelo metodo baseado em 210 Pb. Picos de concentracao de elementos traco foram determinados no testemunho A (1970 e 2010). No testemunho B, foram determinados para as decadas de 1930, 1990 e 2000. As maiores concentracoes medias de elementos traco foram determinados no ponto C. As concentracoes de elementos traco apresentam-se em conformidade com fatos historicos registrados na bacia do Rio Doce como um todo.

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Using Nd Sr isotopes in suspended sediments in the Abrolhos coral-reef (SW Atlantic, Brazil) to assess potential contamination from the 2015 Fundão dam collapse

The Science of The Total Environment (2021)

Heitor Evangelista Cláudio de Morisson Valeriano Gabriel Paravidini Sérgio J. Gonçalves Eduardo Delfino Sodré

10.1016/j.scitotenv.2021.151231

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Natural radioactivity at beach sands in Ilha Grande, Southeastern Brazil

Journal of Radioanalytical and Nuclear Chemistry (2021)

Marcus Vinicius Licínio Alexandre Santos de Alencar Anne Carolina Lima Antônio Carlos de Freitas

Natural radioactivity

10.1007/s10967-020-07587-7

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Paleo-ecological quality status induced by natural and anthropogenic impacts in the last 2000 years: a multidisciplinary approach in the outer region of Sepetiba Bay (SE Brazil)

Journal of Soils and Sediments (2024)

Murilo Barros Saibro Maria Virgínia Alves Martins Rubens César Lopes Figueira Egberto Pereira Heitor Evangelista

Abstract Purpose Some marine organisms can be used as Biological Quality Elements to estimate the degree of environmental impact and to monitor the health of benthic habitats. Organisms with mineralized protections, such as benthic foraminifera, can provide helpful information on the evolution of the coastal system over a long period and determine the Paleo-Ecological Quality Status (Paleo-EcoQS). This work aims at reconstructing the Paleo-EcoQS in the heavily anthropized Sepetiba Bay (SB; Rio de Janeiro State, SE Brazil). Materials and methods This work is based on a multiproxy approach, including textural, geochemical, and foraminiferal data along the core SP11 retrieved near the Pico da Marambaia (a mountain on the tip of the Marambaia Barrier Island). Geochemical analyses encompassing total organic carbon (TOC), total sulfur (S), total nitrogen (N), calcium carbonate (CaCO 3 ), stable isotopes in organic matter ( OM δ 13 C, and OM δ 15 N) and elemental concentrations as well as 201 Pb, 137 Cs, and radiocarbon dating were performed to characterize the Paleo-EcoQS in the bay. Results The values of the Paleo-EcoQS.st (standardized Paleo-EcoQS) index in core SP11 indicate that the paleoenvironmental quality varied from moderate to good between ≈50 AD and ≈1500 AD and from good to high between the ~ 1920s and ~ 1990s. Since the 1990s, the Paleo-EcoQS.st has deteriorated considerably, probably due to the deposition of contaminated dredging material in nearby areas. Ballast water discharge may have introduced alien species, such as Ammonia buzasi , into the SB. Conclusions The results obtained in core SP11, compared to those of another core (i.e., SP8) from a nearby area, suggest that the reference level of maximum environmental quality is not always reached in a period before industrialization in coastal ecosystems with significant interaction with the ocean; natural factors, related, for example, to sedimentary dynamic processes or geomorphological changes, can lead to unexpected results.

10.1007/s11368-024-03925-4

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Avaliação dos teores de Pb, Cd, Sn, Co, Hg, Mo e As em solos da península Fildes - Antártica

Química Nova (2016)

Bruna Miurim Dalfior Larissa Dias Roriz Reginaldo Fabri Antônio Carlos de Freitas Heitor Evangelista da Silva

Pb, Cd, Sn, Co, Hg, Mo AND As IN SOIL FROM FILDES PENINSULA -ANTARCTICA.Antarctic Continent is one of the few places that has not been explored at all, but studies show that this place is suffering interference by human activities.Therefore, monitoring of this region becomes very important.After optimization and verification of the methodology, the concentrations of Pb, Cd, Sn, Co, Hg, Mo and As in soil samples collected in the Fildes Peninsula, King George Island, Antarctica, were determined by ICP-MS.The ranges found (µg kg -1 ) were: for Pb 525.2-2314.1,for Cd 54.8-193.8,for Sn 54.8-193.8,for Co 2095.0-11094.1,for Hg < 2.4-54.6,for Mo 5.3-38.7 and for As 120.3-1297.1.In general, the presence of these elements can be attributed to different factors, such as natural composition of soil, melting process and transport of chemical elements caused by physical phenomena as sea and air currents, besides anthropic contamination.Using enrichment factor was possible suggest contribution by anthropic activities mainly for Co and As.Thus, it is important monitoring the elements levels constantly assisting in environmental protection.

10.21577/0100-4042.20160134

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