Evaporation in Mediterranean conditions: Estimations based on isotopic approaches at the watershed scale

Mattei, Alexandra; Huneau, Frédéric; Garel, Émilie; Santoni, Sébastien; Vystavna, Yuliya

doi:10.1002/hyp.14085

Cited by 11 publications

(11 citation statements)

References 81 publications

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“…The δ 2 H and δ 18 O models had significant differences in terms of interflow and groundwater proportions, which were not related to the interflow parameter bounds. δ 2 H has a better precision than δ 18 O when using laser spectroscopy and these result support the move by isotope hydrologists to use δ 2 H in isotope mixing, where δ 18 O is used for comparison (Mattei et al, 2021;Vystavna et al, 2020). Likewise this study supports the need to integrate and simulate isotope mass fluxes (e.g.…”

Section: Isotope Mixing Considering Data Scarcitysupporting

confidence: 78%

“…This includes hydrological modelling applications as more temporal and spatially comprehensive datasets become available. However, the challenge to compensate for a single missing tracer component, such as soil‐water isotopes, (which are difficult to measure), has, in the past, reduced the application of more robust tertiary mixing relationships between rain, groundwater and soil‐water, as part of stream water in tropical and sub‐tropical climates where snow has limited or no impact on hydrological processes (Mattei et al, 2021; Watson, Miller, Kralisch, et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Towards the development of an isotope‐enabled rainfall‐runoff model: Improving the ability to capture hydrological and anthropogenic change

Watson

Vystavna

Kralisch

et al. 2023

Hydrological Processes

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Global hydrological alterations are being driven by climate change. However, while modelling tools have been instrumental in identifying these changes, their calibration is often dependent solely on streamflow data, which limits the ability to simulate important hydrological processes with the required level of certainty. Constraining hydrological process simulations is required to identify robust model parameters, reducing model uncertainty and providing a baseline model for climate‐related risk assessments. In this study, stable isotope measurements of rainwater, groundwater and stream water (δ2H and δ18O), together with an end member mixing analysis (EMMA) (as a post‐processing step) were integrated with the Jena adaptative modelling system (JAMS)/J2000 rainfall‐runoff model, named J2000iso. The J2000iso models of δ2H and δ18O were able to achieve a streamflow Nash–Sutcliffe efficiency (NSE) of 0.75 and 0.72 and an isotope mixing Kling–Gupta efficiency (KGE) of 0.51 and 0.60, respectively. Compared with the base version, the J2000iso had a much smaller variability with 56% less ensemble variance in the NSE, 13% more simulated interflow which resulted in a better soil‐moisture simulation at an observation point, and lower simulated flow component uncertainty. The J2000iso δ2H model was more robust than the base version during a subsequent validation in terms of KGE and Bias with 0.60 and 0.002 compared with 0.51 and −0.14 for the base version. The EMMA provided a means to improve the hydrograph separation ability of the JAMS/J2000. As many catchments around the world are still ungauged and are affected by anthropogenic activities, the development and enhancement of isotope‐enabled modelling provides a means to improve the simulation of key hydrological processes.

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Section: Isotope Mixing Considering Data Scarcitysupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Towards the development of an isotope‐enabled rainfall‐runoff model: Improving the ability to capture hydrological and anthropogenic change

Watson

Vystavna

Kralisch

et al. 2023

Hydrological Processes

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“…To highlight the dominant water reservoirs contributing to the flooding and water maintenance in the pond through time, an end‐member mixing analysis (EMMA) approach based on the major element composition of the pond water was used to constrain the proportional contribution of the three different possible water sources: (1) groundwater, (2) subsurface and (3) direct precipitation (Equation ). We assumed that the heterogeneous landscape and geological structures result in marked physico‐chemical variability amongst individual hydrological pathways that are not always detectable using only isotope‐based investigations (Mattei et al, 2021; Vystavna et al, 2020) and propose using major element data as tracers:

1 goodbreak= f_{1} ((), t) goodbreak+ f_{2} ((), t) goodbreak+ f_{3} ((), t)

A_{s} ((), t) goodbreak= f_{1} ((), t) A_{1} ((), t) goodbreak+ f_{2} ((), t) A_{2} ((), t) goodbreak+ f_{3} ((), t) A_{3} ((), t)

B_{s} ((), t) goodbreak= f_{1} ((), t) B_{1} ((), t) goodbreak+ f_{2} ((), t) B_{2} ((), t) goodbreak+ f_{3} ((), t) B_{3} ((), t)

where f 1 , f 2 and f 3 are the mixing proportions and A 1 , A 2 and A 3 (respectively B 1 , B 2 and B 3 ) the end‐member concentrations for tracer A (respectively, tracer B ) for the groundwater, subsurface and surface water reservoirs varying with time ( t ). A s (respectively B s ) is the sample concentration measured in the pond for tracer A varying with time ( t ).…”

Section: Methodsmentioning

confidence: 99%

“…(1) groundwater, (2) subsurface and (3) direct precipitation (Equation 2). We assumed that the heterogeneous landscape and geological structures result in marked physico-chemical variability amongst individual hydrological pathways that are not always detectable using only isotope-based investigations (Mattei et al, 2021;Vystavna et al, 2020) and propose using major element data as tracers:…”

Section: End Member Mixing Analysismentioning

confidence: 99%

“…Considering the climatic context, evaporation affects the δ 2 H and δ 18 O signatures of the pond's water, making their interpretation for calculation of mixing proportions ambiguous (Mattei et al, 2021). In contrast, major ions may be expected to be conservative tracers for mixing proportions calculations (Vystavna et al, 2020).…”

Section: Quantification Of Pond's Water Origin Over Time By Emmamentioning

confidence: 99%

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Isotope hydrology to provide insights into the behaviour of temporary wetlands as a basis for developing sustainable ecohydrological management strategies in Mediterranean regions

et al. 2022

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The lack of hydrological considerations in the existing protection statutes for small temporary wetlands has recently been pointed out as the main cause of their rapidly increasing disappearance. In the present study, we aim to demonstrate the interest of using the tools of isotope hydrology to obtain a rapid and cost effective understanding of the hydrological connectivity of Mediterranean temporary wetlands in order to define the optimal environmental conditions needed to ensure their sustainability. By combining physical and isotope measurements, we have investigated the fragile balance of direct precipitation, subsurface water and groundwater influencing the hydroperiod of a typical Mediterranean temporary pond. The use of the water stable isotopes enabled us to demonstrate (i) the major role played by groundwater and subsurface water in the flooding phase of the temporary pond; (ii) the involvement of different water reservoirs in varying proportions over time to maintain the pond filled with water: precipitation, subsurface and groundwater by using d-excess; (iii) the main role played by evaporation in starting the drying up phase; and (iv) the connection existing between a geographically isolated wetland and the regional groundwater body. These results highlight the urgent need to consider both surface and groundwater fluxes in specific protection statutes for wetlands. To this end, we recommend the use of the water stable isotopes to provide insights into the hydrological behaviour of the wetlands in order to dispose of additional cost-effective arbitration arguments to help ensure their sustainability. The lack of hydrological considerations in existing protection statutes for small temporary wetlands has recently been pointed out as the main cause of their disappearance. Here, by combining physical and isotopes measurements, we first highlight the main role played by groundwater in the flooding phase of the temporary pond and the involvement of different water reservoirs in varying proportions over time to maintain the pond filled. These results demonstrate the connection existing between a geographically isolated wetland and the regional groundwater and highlight the urgent need to consider both surface and groundwater fluxes in specific protection statutes for wetlands.

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Gross primary production of Mediterranean watersheds: Using isotope mass balance approach to improve estimations

Mattei,

Huneau,

Garel

et al. 2024

Ecohydrology

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Global‐scale estimates of carbon fluxes from satellite data‐driven models are constrained by considerable uncertainties regarding Gross Primary Production (GPP) and the lack of the watershed‐scale measurements required for model calibration. Recently conducted global modelling efforts indicate that semiarid ecosystems dominate the increasing trends and inter‐annual variation of net CO2 exchange with the atmosphere, but semi‐arid regions have received little attention with regard to GPP estimation. In this study, we used the distinct isotope effect of transpiration and evaporation to calculate transpiration losses and subsequently CO2 uptake by terrestrial vegetation through the water and carbon cycle using the water use efficiency of plants. By studying two Mediterranean watersheds with contrasted environmental conditions over several hydrological years, we found a strong dependence of GPP on annual and seasonal water availability. The results demonstrated that when compared to GPP values obtained in worldwide biomes using biological methods, our isotope approach was validated, highlighting the limitations of satellite‐data‐driven models like MODIS in capturing the impact of water stress on photosynthesis and GPP estimates. These results encourage investigation of GPP by the isotope mass balance approach where direct carbon flux measurements are rare or absent in order to help to substantiate, modify or shed doubt on interpolated GPP for those regions and achieve consensus on global GPP estimates. Given the relevant role of semi‐arid ecosystems in the global carbon balance as well as the limitation of existing data sets, our improved method based on the isotope mass balance approach helps to obtain rapid and affordable estimates of GPP for semi‐arid ecosystems.

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Evaporation in Mediterranean conditions: Estimations based on isotopic approaches at the watershed scale

Cited by 11 publications

References 81 publications

Towards the development of an isotope‐enabled rainfall‐runoff model: Improving the ability to capture hydrological and anthropogenic change

Towards the development of an isotope‐enabled rainfall‐runoff model: Improving the ability to capture hydrological and anthropogenic change

Isotope hydrology to provide insights into the behaviour of temporary wetlands as a basis for developing sustainable ecohydrological management strategies in Mediterranean regions

Gross primary production of Mediterranean watersheds: Using isotope mass balance approach to improve estimations

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