Vinícius dos Santos

Universidade Estadual Paulista (Unesp)

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Didier Gastmans

Universidade Estadual Paulista (Unesp)

Ricardo Sánchez‐Murillo

The University of Texas at Arlington

Lucas Vituri Santarosa

Universidade Estadual Paulista (Unesp)

Ludmila Vianna Batista

Universidade Estadual Paulista (Unesp)

Ana María Durán‐Quesada

Universidad de Costa Rica

Roberto Eduardo Kirchheim

Serviço Geológico do Brasil - CPRM

Vladimir Eliodoro Costa

Universidade Estadual Paulista (Unesp)

Sebastián Balbín Betancur

Universidade Estadual Paulista (Unesp)

Kazimierz Różański

AGH University of Krakow

Oliver Kracht

International Atomic Energy Agency

Cooperative Institutions

Universidade Estadual Paulista (Unesp)

Associação Brasileira de Águas Subterrâneas

Universidade de São Paulo

Instituto de Geociencias

Universidade Federal do Rio Grande do Sul

International Atomic Energy Agency

Instituto Geológico

Universidade do Estado do Rio de Janeiro

University of Nebraska–Lincoln

Prefeitura do Município de São Paulo

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Distinguishing the Regional Atmospheric Controls on Precipitation Isotopic Variability in the Central-Southeast Portion of Brazil

Advances in Atmospheric Sciences (2022)

Vinícius dos Santos Peter Marshall Fleming Luís Henrique Mancini Stela Dalva Santos Cota Graziele Beatriz de Lima

δ18O

Hydrometeorology

Isotopic signature

10.1007/s00376-022-1367-0

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Citations (5)

Geochemical evolution, residence times and recharge conditions of the multilayered Tubarão aquifer system (State of São Paulo – Brazil) as indicated by hydrochemical, stable isotope and¹⁴C data

Isotopes in Environmental and Health Studies (2020)

Sibele Ezaki Didier Gastmans Mara Akie Iritani Vinícius dos Santos Márcia Regina Stradioto

The Tubarão aquifer system constitutes a very complex, multilayered aquifer enclosed in the Paraná basin (central-southern part of Brazil). Despite the relatively low productivity of wells, groundwater represents an important source of water for the very populated and industrialized zones of the State of São Paulo. An extensive water sampling campaign was carried out followed by hydrochemical and isotopic (δ2H, δ18O, δ13C and 14C) studies, aiming at a better understanding of the aquifer's geochemical evolution, recharge processes, and its groundwater residence times. Two main hydrochemical facies were recognized and divide the aquifer in two portions. The shallow portion – the active hydrological zone of the aquifer – is characterized by the Ca-HCO3 water type, evolving as a system open to atmospheric CO2. Mean residence times are typically lower than 5000 years. The lower portion is mostly characterized by the stagnant, Na-HCO3 water type, evolving under closed system conditions. Residence times average up to 15,000 years, but can reach 44,000 years, which indicates the exploitation of (possibly non-renewable) fossil waters. This study contributes to the establishment of proper policies regarding the sustainable groundwater exploitation of the Tubarão aquifer system.

Environmental isotopes

10.1080/10256016.2020.1797714

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Citations (9)

COMPOSIÇÃO ISOTÓPICA DA PRECIPITAÇÃO COMO FERRAMENTA PARA COMPREENSÃO DE PROCESSOS CLIMÁTICOS

DOAJ (DOAJ: Directory of Open Access Journals) (2019)

Vinícius dos Santos Didier Gastmans Ludmila Vianna Batista Lucas Vituri Santarosa

Isotopos estaveis (18O e 2H) sao excelentes tracadores da molecula de agua ao longo do ciclo hidrologico, sendo utilizados como ferramentas auxiliares na interpretacao de controles climaticos, incorporados em modelos atmosfericos de circulacao geral da atmosfera. As mudancas no estado da agua, atraves do processo de fracionamento isotopico provocam variacao do conteudo de isotopos, o que permite sua associacao com processos de condensacao durante a formacao de nuvem e consequentemente da chuva e parâmetros climaticos, como temperatura, precipitacao, umidade atmosferica, pressao atmosferica, dentre outros. Os mecanismos que controlam a composicao isotopica da precipitacao em areas tropicais nao sao muito bem definidos. Alguns estudos demonstram que a composicao isotopica da precipitacao esta relacionada a variabilidade de fatores locais, como variacao de dados meteorologicos, evaporacao das gotas de chuva durante sua queda para superficie, e ou fatores globais, como a origem da fonte de umidade da chuva, o tipo de nuvem, sistemas atmosfericos que geram a chuva e processos de recirculacao de vapor durante o deslocamento de massas de ar. Deste modo o presente trabalho, tem como objetivo apresentar quais fatores climaticos locais e ou regionais influenciam na composicao isotopica da precipitacao em Rio Claro (SP), localizada proxima ao Tropico de Capricornio. Foram coletadas 205 amostras diarias da precipitacao entre fevereiro de 2014 a dezembro de 2016, que variou de -18,36‰ a 4,89‰ (-3,93±3.49) para o δ18O, -136‰ a 43,40‰ (-17,68±29,10) para o δ2H e 1,44‰ a 26,54‰ (13,81±5,19) para o d-excess. A reta meteorica local, cuja equacao e δ2H = 8.18*δ18O + 14.55, possui inclinacao inferior a Reta Meteorica Global (δ2H = 8*δ18O + 10) e valor do excesso de deuterio maior, indicando que a composicao isotopica da precipitacao de Rio Claro esteja associada a processos de recirculacao de vapor que ocorrem durante o deslocamento de massas de ar que originam a chuva na regiao.

10.14295/ras.v0i0.29354

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Deciphering surface water–groundwater connectivity using chemical and stable isotope tracers (H and O) in the headwaters of São Francisco River, Brazil

The Science of The Total Environment (2024)

Marcela Aragão de Carvalho Ramos Carolina Stager Quaggio Vinícius dos Santos Vladimir Eliodoro Costa Camila de Vasconcelos Müller

10.1016/j.scitotenv.2024.177971

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Recharge seasonality based on stable isotopes: Nongrowing season bias altered by irrigation in Nebraska

Hydrological Processes (2019)

Mikaela Cherry Troy E. Gilmore Aaron R. Mittelstet Didier Gastmans Vinícius dos Santos

Abstract The sustainability of groundwater resources for agricultural and domestic use is dependent on both the groundwater recharge rate and the groundwater quality. The main purpose of this study was to improve the understanding of the timing, or seasonality, of groundwater recharge through the use of stable isotopes. Based on 768 groundwater samples collected from aquifers underlying natural resources districts in Nebraska, the isotopic composition of groundwater (δ 2 H and δ 18 O) was compared with that of precipitation by (a) mapping the isotopic composition of groundwater samples and (b) mapping a seasonality index for groundwater. Results suggest that for the majority of the state, groundwater recharge has a nongrowing season signature (October–April). However, the isotopic composition of groundwater suggests that in some intensively irrigated areas, human intervention in the water cycle has shifted the recharge signature towards the growing season. In other areas, a different human intervention (diversion of Platte River water for irrigation) has likely produced an apparent but possibly misleading nongrowing season recharge signal because the Platte River water differs isotopically from local precipitation. These results highlight the need for local information even when interpreting isotopic data over larger regions. Understanding the seasonality of recharge can provide insight into the optimal times to apply fertilizer, specifically in highly conductive soils with high leaching potential. In areas with high groundwater nitrate concentrations, this information is valuable for protecting the groundwater from further degradation. Although previous studies have framed nongrowing season recharge within the context of future climate change, this study also illustrates the importance of understanding how historical human intervention in the water cycle has affected groundwater recharge seasonality and subsequent implications for groundwater recharge and quality.

Depression-focused recharge

Seasonality

Isotopic signature

10.1002/hyp.13683

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Citations (18)

Day-night differences in δ18O and d-excess of convective rainfall in the inland tropics of Brazil

Research Square (Research Square) (2023)

Vinícius dos Santos Didier Gastmans Ana María Durán‐Quesada Ricardo Sánchez‐Murillo Kazimierz Różański

Abstract The tropical central-southern part of Brazil (CSB) is characterized by strong convective systems that bring generous water supply for agro-industrial activities but also pose flood risks for large cities. Here, we present high-frequency (5-10 minutes) rainfall isotopic compositions to better understand those systems. In total, 260 intra-event samples representing 18 rainfall events were collected during the period 2019-2021. In summer, convective rainfall activity modulates regional and local isotopic characteristics, revealing a novel perspective on day-night contrast in δ18O and d-excess values. During the daytime, enhanced sub-cloud effects are related to high δ18O and low d-excess, while at night-time, continuous regional rainout results in more depleted δ18O and high d-excess values. Our results offer a new framework of key drivers controlling the isotopic variability of rainfall across the tropics.

δ18O

10.21203/rs.3.rs-2409508/v1

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Determining a composite value for the saturated hydraulic conductivity in a recharge area of the Guarani Aquifer System, using pedotransfer functions

RBRH (2021)

Marcelo Eduardo Dias de Oliveira Didier Gastmans Marcelo Donadelli Sacchi Rodrigo Esteves Rocha Camila de Lima

ABSTRACT The saturated hydraulic conductivity (Ks) is an essential property for modeling water and contaminants movement into aquifers. However, Ks is extremely variable, even when considering nearby locations, which poses a challenge for modeling at catchment scales. Field measurements of Ks are most of the time expensive, time-consuming and labor-intensive. This study aimed to obtain, for modeling purposes, and using pedotransfer functions (PTFs), a composite value of Ks at a catchment scale, in a recharge area of the Guarani Aquifer System. Soil samples were taken across the study area, and the Ks for each sampling point were determined by several PTF methods. At the same locations, Ks field measurements were taken using a Guelph permeameter. Average values of Ks for all the sampling points calculated by PTFs were similar to the average value obtained by field measurements. The use of PTFs proved to be a faster and simpler method to efficiently determine the Ks value for the watershed and to capture the stochastic variation in terms of soil pore combination at the watershed scale.

Pedotransfer function

Permeameter

10.1590/2318-0331.262120210045

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Isotopic composition of convective rainfall in the inland tropics of Brazil

Atmospheric chemistry and physics (2024)

Vinícius dos Santos Didier Gastmans Ana María Durán‐Quesada Ricardo Sánchez‐Murillo Kazimierz Różański

Abstract. Strong convective systems characterize the tropical central-southern region of Brazil. These systems provide abundant water supply for agroindustrial activities and pose flood risks to large cities. Here, we present high-frequency (2–10 min; inter- and intra-event) rainfall isotopic compositions (n = 90 samples) to reveal regional and local atmospheric processes controlling the isotopic variability of convective systems between 2019–2021. Inter-event rainfall weighted-average (δwgd) values were low (δ18Owgd ≤ −10.0 ‰) due to the higher rainfall along the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model trajectories from the Amazon forest during the summer. In contrast, during autumn and spring seasons HYSPLIT model trajectories from the Atlantic Ocean and southern Brazil exhibited lower rainfall amounts, resulting in high δ18Owgd ≥ −4.2 ‰. This strong regional δwgd pattern often masks intra-event isotopic variability. Therefore, we analyzed the vertical structure of local rainfall using reflectivity (Z) from microradar data. Variations in Z indicate that microphysical processes as raindrops fall led to changes in δ18O and deuterium excess (d-excess). Our findings establish a novel framework for evaluating the meteorological controls on the isotopic variability of convective precipitation in tropical South America, fill the gap in high-frequency studies in this region, and generate an isotopic dataset for convective model evaluations.

10.5194/acp-24-6663-2024

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Citations (4)

COMPOSIÇÃO ISOTÓPICA DA PRECIPITAÇÃO E SUAS RELAÇÕES COM A VARIABILIDADE CLIMÁTICA

Holos Environment (2016)

Vinícius dos Santos Didier Gastmans

Isotopos estaveis de oxigenio e hidrogenio (18O e 2H) constituem excelentes tracadores da movimentacao da agua ao longo do ciclo hidrologico, sendo utilizados como ferramentas importantes na compreensao dos controles climaticos sobre a precipitacao, o que possibilita sua utilizacao em estudos de reconstituicao paleoclimaticas. As relacoes existentes entre a composicao isotopica da precipitacao e alguns parâmetros climaticos, como temperatura e quantidade de precipitacao, sao muito bem estabelecidos em altas latitudes, entretanto, em areas tropicais essas relacoes nao sao muito claras, e a necessidade de compreensao da acao dos parâmetros climaticos sobre a composicao isotopica da precipitacao nessas areas, tem-se intensificado face as mudancas climaticas. Durante os meses de fevereiro/2014 e fevereiro/2015, procedeu-se a coleta de amostras diarias da precipitacao na cidade de Rio Claro, com o objetivo de se verificar a composicao isotopica da precipitacao local e a variacao sazonal dos parâmetros climaticos. A composicao isotopica da precipitacao variou de -18,36‰ a +0,82‰ V-SMOW para o δ18O e -136,0‰ a 23,1‰ V-SMOW para o δ2H. A reta meteorica local (δ2H = 8,06*δ18O+13,36) possui inclinacao similar a Reta Meteorica Global, entretanto com valor do excesso de deuterio superior, indicando que diferentes fontes de vapor e processos de evaporacao atuaram ao longo do deslocamento das massas de ar que originam as precipitacoes. A avaliacao do deslocamento das massas de ar e trajetorias de particula foi realizada, utilizando-se o modelo HYSPLIT. A analise estatistica, por meio da regressao linear multipla, considerando as razoes isotopicas de 2H e 18O como variaveis dependentes, indicou que as variaveis independentes temperatura e precipitacao ao longo da trajetoria, calculados pelo modelo HYSPLIT, apresentaram coeficiente de correlacao multipla satisfatorio, de 0,77. Entretanto, o modelo nao obteve uma boa resposta para os valores acentuados. Tendo como base os resultados ja adquiridos, o presente projeto de mestrado, pretende melhorar a analise da composicao isotopica da precipitacao, evoluindo o modelo estatistico, inserindo novos parâmetros de analise, como a identificacao dos tipos de chuva (estratiforme e convectiva), atraves do satelite Tropical Rainfall Measuring Mission (TRMM), uma vez que mudancas isotopicas significativas estao associadas aos tipos de formacao de chuva, e comparacao dos resultados isotopicos obtidos entre as cidades de Rio Claro (SP) e Ourinhos (SP), ampliando a avaliacao em areas tropicais. A combinacao do modelo HYSPLIT com o Radar do TRMM fornecera um melhor detalhamento na compreensao dos processos atmosfericos que afetam essas localidades, principalmente no que se referem a atuacao dos sistemas atmosfericos que originam as chuvas no Brasil.

HYSPLIT

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Recharge Seasonality Based on Stable Isotopes: Nongrowing Season Bias Altered by Irrigation in Nebraska

AGU Fall Meeting Abstracts (2019)

Mikaela Cherry Troy E. Gilmore Aaron R. Mittelstet Didier Gastmans John B. Gates

Seasonality

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