Analysis of long-term stable isotopic composition in German precipitation

Stumpp, Christine; Klaus, Julian; Stichler, Willibald

doi:10.1016/j.jhydrol.2014.05.034

Cited by 128 publications

(118 citation statements)

References 44 publications

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“…In alpine catchments, the intensity and extension of hydropower reservoirs show important impacts on the natural seasonal isotopic amplitude, indicating for example the fluctuating mixing ratios of water sources due to reservoir storage and release (Rank et al, 1998Schotterer, 2010). Long-term patterns of isotopes in rivers generally correlate with that of local precipitation; however, the catchment signals may be delayed up to several years , or differ for rivers within a geographical region (Schotterer, 2010;Stumpp et al, 2015). Hence, long-term riverine isotopic time series are key to providing scientific information for water managers and researchers to gain insights to study hydrological processes and better focus integrated water management strategies.…”

Section: Introductionmentioning

confidence: 99%

The Global Network of Isotopes in Rivers (GNIR): integration of water isotopes in watershed observation and riverine research

Halder

Terzer

Wassenaar

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. We introduce a new online global database of riverine water stable isotopes (Global Network of Isotopes in Rivers, GNIR) and evaluate its longer-term data holdings. Overall, 218 GNIR river stations were clustered into three different groups based on the seasonal variation in their isotopic composition, which was closely coupled to precipitation and snowmelt water runoff regimes. Sinusoidal fit functions revealed phases within each grouping and deviations from the sinusoidal functions revealed important river alterations or hydrological processes in these watersheds. The seasonal isotopic amplitude of δ 18 O in rivers averaged 2.5 ‰, and did not increase as a function of latitude, like it does for global precipitation. Low seasonal isotopic amplitudes in rivers suggest the prevalence of mixing and storage such as occurs via lakes, reservoirs, and groundwater. The application of a catchment-constrained regionalized cluster-based water isotope prediction model (CC-RCWIP) allowed for direct comparison between the expected isotopic compositions for the upstream catchment precipitation with the measured isotopic composition of river discharge at observation stations. The catchment-constrained model revealed a strong global isotopic correlation between average rainfall and river discharge (R 2 = 0.88) and the study demonstrated that the seasonal isotopic composition and variation of river water can be predicted. Deviations in data from model-predicted values suggest there are important natural or anthropogenic catchment processes like evaporation, damming, and water storage in the upstream catchment.

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Section: Introductionmentioning

confidence: 99%

The Global Network of Isotopes in Rivers (GNIR): integration of water isotopes in watershed observation and riverine research

Halder

Terzer

Wassenaar

et al. 2015

Hydrol. Earth Syst. Sci.

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“…The magnitude d values are not only related to the retention time of geothermal water in an aquifer, but also depend on the depth of the formation and the chemical composition of the oxygen compounds in the rock [32,33]. There are several reasons for this, including differences in depth, densities of rock strata, conditions of water circulation, and different structural types and chemical compositions of minerals, leading to different solubility in water-rock interactions.…”

Section: Value Characteristicsmentioning

confidence: 99%

Understanding the Burial and Migration Characteristics of Deep Geothermal Water Using Hydrogen, Oxygen, and Inorganic Carbon Isotopes

Wang

Qiao

Chen

et al. 2017

Water

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Geothermal water samples taken from deep aquifers within the city of Kaifeng at depths between 800 and 1650 m were analyzed for conventional water chemical compositions and stable isotopes. These results were then combined with the deuterium excess parameter (d value), and the contribution ratios of different carbon sources were calculated along with distributional characteristics and data on the migration and transformation of geothermal water. These results included the conventional water chemical group, hydrogen, and oxygen isotopes (δD-δ 18 O), dissolved inorganic carbon (DIC) and associated isotopes (δ 13 C DIC ). The results of this study show that geothermal water in the city of Kaifeng is weakly alkaline, water chemistry mostly comprises a HCO 3 -Na type, and the range of variation of δD is between −76.12‰ and −70.48‰, (average: −74.25‰), while the range of variation of δ 18 O is between −11.08‰ and −9.41‰ (average: −10.15‰). Data show that values of d vary between 1.3‰ and 13.3‰ (average: 6.91‰), while DIC content is between 91.523 and 156.969 mg/L (average: 127.158 mg/L). The recorded range of δ 13 C DIC was between −10.160‰ and −6.386‰ (average: −9.019‰). The results presented in this study show that as depth increases, so do δD and δ 18 O, while d values decrease and DIC content and δ 13 C DIC gradually increase. Thus, δD, δ 18 O, d values, DIC, and δ 13 C DIC can all be used as proxies for the burial characteristics of geothermal water. Because data show that the changes in d values and DIC content are larger along the direction of geothermal water flow, so these proxies can be used to indicate migration. This study also shows demonstrates that the main source of DIC in geothermal water is CO 2 thathas a biological origin in soils, as well as the dissolution of carbonate minerals in surrounding rocks. Thus, as depth increases, the contribution of soil biogenic carbon sources to DIC decreases while the influence of carbonate dissolution on DIC increases.

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“…Future δ P trends are uncertain; however, they have been shown to be mainly dependent on temperature evolution and local factors (Stumpp et al, 2014), and a recent study in Siberia showed that a long-term increase in precipitation δ 18 O is close to the detection limit of the tracers (< 1‰ per 50 years) (Butzin et al, 2014). Monthly current means were therefore used in the current simulations.…”

Section: Stable Isotopic Mass Balancementioning

confidence: 99%

“…In the present study, the fifth version of the Canadian RCM (CRCM5) was chosen, which has a 0.44‰ horizontal grid resolution (approx. 50 km; Sushama et al, 2010;Martynov et al, 2013;Šeparović et al, 2013). The CRCM5 is a gridpoint model, based on a two-time-level, semi-Lagrangian, (quasi) fully implicit time discretization scheme (Alexandru and Sushama, 2016).…”

Section: Evolution Scenarios 231 Climate Modelsmentioning

confidence: 99%

Impacts of changes in groundwater recharge on the isotopic composition and geochemistry of seasonally ice-covered lakes: insights for sustainable management

Arnoux

Barbecot²,

Gibert-Brunet

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Lakes are under increasing pressure due to widespread anthropogenic impacts related to rapid development and population growth. Accordingly, many lakes are currently undergoing a systematic decline in water quality. Recent studies have highlighted that global warming and the subsequent changes in water use may further exacerbate eutrophication in lakes. Lake evolution depends strongly on hydrologic balance, and therefore on groundwater connectivity. Groundwater also influences the sensitivity of lacustrine ecosystems to climate and environmental changes, and governs their resilience. Improved characterization of groundwater exchange with lakes is needed today for lake preservation, lake restoration, and sustainable management of lake water quality into the future. In this context, the aim of the present paper is to determine if the future evolution of the climate, the population, and the recharge could modify the geochemistry of lakes (mainly isotopic signature and quality via phosphorous load) and if the isotopic monitoring of lakes could be an efficient tool to highlight the variability of the water budget and quality.Small groundwater-connected lakes were chosen to simulate changes in water balance and water quality expected under future climate change scenarios, namely representative concentration pathways (RCPs) 4.5 and 8.5. Contemporary baseline conditions, including isotope mass balance and geochemical characteristics, were determined through an intensive field-based research program prior to the simulations. Results highlight that future lake geochemistry and isotopic composition trends will depend on four main parameters: location (and therefore climate conditions), lake catchment size (which impacts the intensity of the flux change), lake volume (which impacts the range of variation), and lake G index (i.e., the percentage of groundwater that makes up total lake inflows), the latter being the dominant control on water balance conditions, as revealed by the sensitivity of lake isotopic composition. Based on these model simulations, stable isotopes appear to be especially useful for detecting changes in recharge to lakes with a G index of between 50 and 80 %, but response is non-linear. Simulated monthly trends reveal that evolution of annual lake isotopic composition can be dampened by opposing monthly recharge fluctuations. It is also shown that changes in water quality in groundwaterconnected lakes depend significantly on lake location and on the intensity of recharge change.

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Analysis of long-term stable isotopic composition in German precipitation

Cited by 128 publications

References 44 publications

The Global Network of Isotopes in Rivers (GNIR): integration of water isotopes in watershed observation and riverine research

The Global Network of Isotopes in Rivers (GNIR): integration of water isotopes in watershed observation and riverine research

Understanding the Burial and Migration Characteristics of Deep Geothermal Water Using Hydrogen, Oxygen, and Inorganic Carbon Isotopes

Impacts of changes in groundwater recharge on the isotopic composition and geochemistry of seasonally ice-covered lakes: insights for sustainable management

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