Stable isotopes of oxygen to characterize a Metalimnetic Oxygen Minimum: insights from a 48 hours field campaign at Rappbode Reservoir, Germany

2021 ◽  
Author(s):  
Marlene Dordoni ◽  
Karsten Rinke ◽  
Michael Seewald ◽  
Jakob Schmidmeier ◽  
Johannes A.C. Barth
Keyword(s):  
Stable Isotopes ◽  
Dissolved Inorganic Carbon ◽  
Carbon Stable Isotopes ◽  
Surface Layers ◽  
Natural Lakes ◽  
Lakes And Reservoirs ◽  
Isotopic Characterization ◽  
Do Concentration ◽  
Intensive Sampling ◽  
Oxygen Minimum

<div><span>The appearance of a Metalimnetic Oxygen Minimum (MOM) has been recorded in many natural lakes and reservoirs. However, its isotopic characterization with oxygen and carbon stable isotopes have not yet been fully constrained. The purpose of this work is to apply stable isotopes of carbon and oxygen to characterize photosynthetic and respiratory activities in the Rappbode Reservoir, Germany. Here we present the results of a 48 hours intensive sampling in July 2020. We provide preliminary data of dissolved oxygen (DO) concentration and saturation profiles, together with dissolved inorganic carbon (DIC). This includes data of oxygen (</span><span>δ</span><sup><span>18</span></sup><span>O<sub>DO</sub>) and carbon (</span><span>δ</span><sup><span>13</span></sup><span>C<sub>DIC</sub>) stable isotopes with particular focus on the metalimnion. Our profiles identified minor differences from day to day, such as an additional respiration-like peak above the MOM. Samples from within the MOM were characterized by the lowest oxygen content and saturation (7.05 mg L<sup>-1</sup> and 75 %, respectively) and the highest </span><span>δ</span><sup><span>18</span></sup><span>O<sub>DO</sub> (up to +30.1‰). These samples also showed the lowest </span><span>δ</span><sup><span>13</span></sup><span>C<sub>DIC </sub>values (down to -12.8‰). Surface layers (between 0 and 9 meters) and the deepest water sample (65 meters) did not follow the expected depth profiles for </span><span>δ</span><sup><span>18</span></sup><span>O<sub>DO</sub> and </span><span>δ</span><sup><span>13</span></sup><span>C<sub>DIC</sub>. Surface layers were likely influenced by equilibration with the atmosphere that was enhanced by windy conditions. On the other hand, samples from 65 meters depth could have been perturbed by the presence of organic material from sediments. Moreover, oxygen and carbon stable isotopes patterns were able to show that the MOM can migrate within the water column up to 5 meters within 12 hours. These findings offer an interesting basis to establish mass balances of oxygen and carbon turnover in water bodies.</span></div>

scholarly journals PHYSICOCHEMICAL AND ISOTOPIC CHARACTERIZATION OF FORMATION WATERS FROM OIL FIELDS IN THE SERGIPE BASIN, BRAZIL

2014 ◽  
Vol 32 (3) ◽  
pp. 531
Author(s):  
Danilo R. Sá Teles ◽  
Antônio Expedito G. de Azevedo ◽  
Alexandre B. Costa ◽  
Maria R. Zucchi ◽  
Alexandre A. Ferreira
Keyword(s):  
Stable Isotopes ◽  
Isotopic Exchange ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Oil Fields ◽  
Northeastern Brazil ◽  
Formation Water ◽  
Water Formation ◽  
Isotopic Characterization

ABSTRACT. This paper presents a study of the physicochemical and isotopic characteristics of formation waters from the Castanhal, Siririzinho and Aguilhadafields in the Sergipe Basin, northeastern Brazil. In each of the samples, pH, conductivity, concentration of dissolved inorganic carbon (DIC), δ18O, δ2H, and δ13C weremeasured. These measurements are used to identify isotopic similarities among waters from local aquifers, which can be used as a proxy for groundwater connectivitywith formation water. Formation waters from the Castanhal and Siririzinho fields are enriched in deuterium, as evidenced by their δ2H values above the Global MeteoricWater Line (GMWL), which may be a result of significant isotopic exchange between water and H2S. These measurements are in accordance with the large enrichment in13C of DIC resulting from biodegradation, with the formation of methane depleted in 13C and CO2 enriched in 13C. These results indicate interaction between formationwater with rocks and other fluids.Keywords: stable isotopes, dissolved inorganic carbon, biodegradation. RESUMO. Este trabalho apresenta um estudo das características físico-químicas e isotópicas de águas de formação dos campos Castanhal, Siririzinho e Aguilhada, localizados na Bacia de Sergipe, nordeste do Brasil. Em cada uma das amostras foram medidos os parâmetros pH, condutividade elétrica, concentração de carbonoinorgânico dissolvido (CID), δ18O, δ2H e δ13C. A partir dos resultados obtidos, foi possível identificar a similaridade isotópica com as águas de aquíferos locais,indicando conexão de água subterrânea com água de formação. As águas de formação dos campos Castanhal e Siririzinho apresentaram um enriquecimento em deutério,resultado da troca isotópica entre a água e o H2S. Também foi verificado, um grande enriquecimento no δ13C do CID, resultado dos processos de biodegradação coma formação de metano empobrecido em 13C e CO2 enriquecido neste isótopo. Os resultados encontrados indicam interação entre a água de formação com as rochas ecom outros fluidos.Palavras-chave: isótopos estáveis, carbono inorgânico dissolvido, biodegradação.

Characterisation of a bio-based packaging containing a natural additive from Allium spp. using analytical pyrolysis and carbon stable isotopes

2016 ◽  
Vol 120 ◽  
pp. 334-340 ◽  
Author(s):  
María Llana-Ruíz-Cabello ◽  
Silvia Pichardo ◽  
Nicasio T. Jiménez-Morillo ◽  
Paloma Abad ◽  
Enrique Guillamón ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Carbon Stable Isotopes ◽  
Analytical Pyrolysis ◽  
Natural Additive

CHARACTERIZATION OF NITROGEN AND CARBON STABLE ISOTOPES IN EPIPHYTIC FORAMINIFERAL MORPHOTYPES

2016 ◽  
Vol 46 (3) ◽  
pp. 271-284 ◽  
Author(s):  
Guillem Mateu-Vicens ◽  
Teresa Sebastián ◽  
Anna Khokhlova ◽  
Maria del Mar Leza ◽  
Salud Deudero
Keyword(s):  
Stable Isotopes ◽  
Carbon Stable Isotopes

Forest cover controls the nitrogen and carbon stable isotopes of rivers

2022 ◽  
pp. 152784
Author(s):  
Fausto Machado-Silva ◽  
Vinicius Neres-Lima ◽  
Andrea Franco Oliveira ◽  
Timothy Peter Moulton
Keyword(s):  
Stable Isotopes ◽  
Forest Cover ◽  
Carbon Stable Isotopes

scholarly journals Use of carbon stable isotopes to monitor biostimulation and electron donor fate in chromium-contaminated groundwater

Chemosphere ◽  
2019 ◽  
Vol 235 ◽  
pp. 440-446 ◽  
Author(s):  
Markus Bill ◽  
Mark E. Conrad ◽  
Boris Faybishenko ◽  
Joern T. Larsen ◽  
Jil T. Geller ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Electron Donor ◽  
Contaminated Groundwater ◽  
Carbon Stable Isotopes

Methane Cycling Contributes to Distinct Patterns in Carbon Stable Isotopes of Wetland Detritus

Wetlands ◽  
2018 ◽  
Vol 39 (2) ◽  
pp. 361-370
Author(s):  
Julia A. Hart ◽  
Carmella Vizza ◽  
William E. West ◽  
Dominic T. Chaloner ◽  
Stuart E. Jones ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Carbon Stable Isotopes ◽  
Methane Cycling

scholarly journals Response of export production and dissolved oxygen concentrations in oxygen minimum zones to <i>p</i>CO<sub>2</sub> and temperature stabilization scenarios in the biogeochemical model HAMOCC 2.0

2017 ◽  
Vol 14 (4) ◽  
pp. 781-797 ◽  
Author(s):  
Teresa Beaty ◽  
Christoph Heinze ◽  
Taylor Hughlett ◽  
Arne M. E. Winguth
Keyword(s):  
Pacific Ocean ◽  
Organic Carbon ◽  
Dissolved Oxygen ◽  
Radiative Forcing ◽  
The Pacific ◽  
Poc Flux ◽  
Poc Export ◽  
The Pacific Ocean ◽  
Do Concentration ◽  
Oxygen Minimum

Abstract. Dissolved oxygen (DO) concentration in the ocean is an important component of marine biogeochemical cycles and will be greatly altered as climate change persists. In this study a global oceanic carbon cycle model (HAMOCC 2.0) is used to address how mechanisms of oxygen minimum zone (OMZ) expansion respond to changes in CO2 radiative forcing. Atmospheric pCO2 is increased at a rate of 1 % annually and the model is stabilized at 2 ×, 4 ×, 6  ×, and 8 × preindustrial pCO2 levels. With an increase in CO2 radiative forcing, the OMZ in the Pacific Ocean is controlled largely by changes in particulate organic carbon (POC) export, resulting in increased remineralization and thus expanding the OMZs within the tropical Pacific Ocean. A potential decline in primary producers in the future as a result of environmental stress due to ocean warming and acidification could lead to a substantial reduction in POC export production, vertical POC flux, and thus increased DO concentration particularly in the Pacific Ocean at a depth of 600–800 m. In contrast, the vertical expansion of the OMZs within the Atlantic is linked to increases POC flux as well as changes in oxygen solubility with increasing seawater temperature. Changes in total organic carbon and increase sea surface temperature (SST) also lead to the formation of a new OMZ in the western subtropical Pacific Ocean. The development of the new OMZ results in dissolved oxygen concentration of  ≤  50 µmol kg−1 throughout the equatorial Pacific Ocean at 4 times preindustrial pCO2. Total ocean volume with dissolved oxygen concentrations of  ≤  50 µmol kg−1 increases by 2.4, 5.0, and 10.5 % for the 2 ×, 4 ×, and 8 × CO2 simulations, respectively.

scholarly journals The application of noble gases and carbon stable isotopes in tracing the fate, migration and storage of CO2

2014 ◽  
Vol 63 ◽  
pp. 4123-4133 ◽  
Author(s):  
Stuart Gilfillan ◽  
Stuart Haszedline ◽  
Fin Stuart ◽  
Domokos Gyore ◽  
Rachel Kilgallon ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Noble Gases ◽  
Carbon Stable Isotopes ◽  
And Storage
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