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  • 1
    Online Resource
    Online Resource
    Using water stable isotopes to understand evaporation, moisture stress, and re-wetting in catchment forest and grassland soils of the summer drought of 2018 (2020)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    b3kat_BV046866951
    Format: 1 Online-Ressource
    Language: English
    DOI: 10.18452/21841
    URN: urn:nbn:de:kobv:11-110-18452/22559-3
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    HU Berlin
  • 2
    Online Resource
    Online Resource
    Spatially distributed tracer-aided runoff modelling and dynamics of storage and water ages in a permafrost-influenced catchment (2019)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    b3kat_BV045910230
    Format: 1 Online-Ressource
    Language: English
    DOI: 10.18452/20607
    URN: urn:nbn:de:kobv:11-110-18452/21386-3
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  • 3
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    Online Resource
    Visualizing catchment‐scale spatio‐temporal dynamics of storage‐flux‐age interactions using a tracer‐aided ecohydrological model (2022)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_25263
    Format: 1 Online-Ressource (3 Seiten)
    ISSN: 0885-6087 , 0885-6087
    Content: Peer Reviewed
    In: New York, NY : Wiley, 36,2, 0885-6087
    Language: English
    DOI: 10.1002/hyp.14460
    DOI: 10.18452/24586
    URN: urn:nbn:de:kobv:11-110-18452/25263-1
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  • 4
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    Online Resource
    Estimates of water partitioning in complex urban landscapes with isotope‐aided ecohydrological modelling (2022)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_25629
    Format: 1 Online-Ressource (10 Seiten)
    Content: Urban green space is increasingly viewed as essential infrastructure to build resilience to climate change by retaining water in the city landscape and balancing ecohydrological partitioning into evapotranspiration for cooling and groundwater recharge. Quantifying how different vegetation types affect water partitioning is essential for future management, but paucity of data and the complex heterogeneity of urban areas make water balance estimates challenging. Here, we provide a preliminary assessment of water partitioning from different sized patches of trees and grass as well as from sealed surfaces. To do this, we used limited field observations together with an advanced, process-based tracer-aided ecohydrological model at a meso-scale (5 km2) in central Berlin, Germany. Transpiration was the dominant green water flux accounting for over 50% of evapotranspiration in the modelled area. Green water fluxes were in general greater from trees compared with grass, but grass in large parks transpired more water compared with grass in small parks that were intensively used for recreation. Interception evaporation was larger for trees compared with grass, but soil water evaporation was greater for grass compared with trees. We also show that evapotranspiration from tree-covered areas comprise almost 80% of the total evapotranspiration from the whole model domain while making up less than 30% of the surface cover. The results form an important stepping-stone towards further upscaling over larger areas and highlights the importance of continuous high-resolution hydrological measurements in the urban landscape, as well as the need for improvements to ecohydrological models to capture important urban processes.
    Content: Peer Reviewed
    In: New York, NY : Wiley, 36,3
    Language: English
    DOI: 10.1002/hyp.14532
    DOI: 10.18452/24948
    URN: urn:nbn:de:kobv:11-110-18452/25629-8
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  • 5
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    Online Resource
    Stable isotopes of water reveal differences in plant – soil water relationships across northern environments (2020)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_23614
    Format: 1 Online-Ressource (19 Seiten)
    ISSN: 0885-6087 , 0885-6087
    Content: We compared stable isotopes of water in plant stem (xylem) water and soil collected over a complete growing season from five well-known long-term study sites in northern/cold regions. These spanned a decreasing temperature gradient from Bruntland Burn (Scotland), Dorset (Canadian Shield), Dry Creek (USA), Krycklan (Sweden), to Wolf Creek (northern Canada). Xylem water was isotopically depleted compared to soil waters, most notably for deuterium. The degree to which potential soil water sources could explain the isotopic composition of xylem water was assessed quantitatively using overlapping polygons to enclose respective data sets when plotted in dual isotope space. At most sites isotopes in xylem water from angiosperms showed a strong overlap with soil water; this was not the case for gymnosperms. In most cases, xylem water composition on a given sampling day could be better explained if soil water composition was considered over longer antecedent periods spanning many months. Xylem water at most sites was usually most dissimilar to soil water in drier summer months, although sites differed in the sequence of change. Open questions remain on why a significant proportion of isotopically depleted water in plant xylem cannot be explained by soil water sources, particularly for gymnosperms. It is recommended that future research focuses on the potential for fractionation to affect water uptake at the soil-root interface, both through effects of exchange between the vapour and liquid phases of soil water and the effects of mycorrhizal interactions. Additionally, in cold regions, evaporation and diffusion of xylem water in winter may be an important process.
    Content: Peer Reviewed
    In: New York, NY : Wiley, 35,1, 0885-6087
    Language: English
    DOI: 10.1002/hyp.14023
    DOI: 10.18452/22939
    URN: urn:nbn:de:kobv:11-110-18452/23614-9
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    HU Berlin
  • 6
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    Online Resource
    Using water stable isotopes to understand evaporation, moisture stress, and re-wetting in catchment forest and grassland soils of the summer drought of 2018 (2020)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_22559
    Format: 1 Online-Ressource (16 Seiten)
    Content: In drought-sensitive lowland catchments, ecohydrological feedbacks to climatic anomalies can give valuable insights into ecosystem functioning in the context of alarming climate change projections. However, the dynamic influences of vegetation on spatio-temporal processes in water cycling in the critical zone of catchments are not yet fully understood. We used water stable isotopes to investigate the impacts of the 2018 drought on dominant soil–vegetation units of the mixed land use Demnitz Millcreek (DMC, north-eastern Germany) catchment (66 km2). The isotope sampling was carried out in conjunction with hydroclimatic, soil, groundwater, and vegetation monitoring. Drying soils, falling groundwater levels, cessation of streamflow, and reduced crop yields demonstrated the failure of catchment water storage to support “blue” (groundwater recharge and stream discharge) and “green” (evapotranspiration) water fluxes. We further conducted monthly bulk soil water isotope sampling to assess the spatio-temporal dynamics of water soil storage under forest and grassland vegetation. Forest soils were drier than the grassland, mainly due to higher interception and transpiration losses. However, the forest soils also had more freely draining shallow layers and were dominated by rapid young (age 〈2 months) water fluxes after rainfall events. The grassland soils were more retentive and dominated by older water (age 〉2 months), though the lack of deep percolation produced water ages 〉1 year under forest. We found the displacement of any “drought signal” within the soil profile limited to the isotopic signatures and no displacement or “memory effect” in d-excess over the monthly time step, indicating rapid mixing of new rainfall. Our findings suggest that contrasting soil–vegetation communities have distinct impacts on ecohydrological partitioning and water ages in the sub-surface. Such insights will be invaluable for developing sustainable land management strategies appropriate to water availability and building resilience to climate change.
    Content: Peer Reviewed
    Note: This article was supported by the German Research Foundation (DFG) and the Open Access Publication Fund of Humboldt-Universität zu Berlin.
    In: Göttingen : Copernicus Publ., 24, Seiten 3737-3752
    Language: English
    DOI: 10.18452/21841
    DOI: 10.5194/hess-24-3737-2020
    URN: urn:nbn:de:kobv:11-110-18452/22559-3
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    HU Berlin
  • 7
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    Online Resource
    Critical Zone Response Times and Water Age Relationships Under Variable Catchment Wetness States: Insights Using a Tracer‐Aided Ecohydrological Model (2022)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_25535
    Format: 1 Online-Ressource (21 Seiten)
    Content: The dynamic relationships between water flux and storage, together with the associated water ages and speed of hydrological responses (as proxies for velocity and celerity respectively) are fundamental to understanding how catchments react to hydroclimate perturbations, such as floods and droughts. Using results from a calibrated, tracer-aided ecohydrological model (EcH2O-iso) we analyzed the dynamics of storage-flux-age-response time (RT) interactions at scales that resolve the internal heterogeneity of these non-stationary relationships. EcH2O-iso has previously shown an adequate representation of ecohydrological flux partitioning and storage dynamics (celerity), and water ages (velocity) over 11-year at Demnitzer Millcreek catchment (DMC, 66 km2), a drought-sensitive, lowland catchment in Germany. The 11-year period had marked hydroclimatic contrasts facilitating the evaluation of flux-storage-age-RT dynamics under different wetness anomalies. Our results show that the spatio–temporal variability of soil moisture and ecohydrological partitioning dynamics reflect both land use (especially forest cover) and distinct soil units (i.e., brown earth vs. podzolic soils). Spatial differences in RTs of storage were driven by rapid soil evaporation and transpiration responses to rainfall, which revealed a divergence of transpiration ages from RTs. RTs of groundwater and streamflow were fast (days), but mediation by soil water storage dynamics caused marked separation from water ages (years-decades) of deeper flow paths. Analysis of RTs and ages revealed a degradation of process representation with coarsening model spatial resolution. This study uses novel analysis of the spatio-temporal interactions of flux-storage-age-RT from a model to understand the sensitivity and resilience of catchment functionality to hydroclimatic perturbations.
    Content: Peer Reviewed
    In: New York : Wiley, 58,4
    Language: English
    DOI: 10.1029/2021WR030584
    DOI: 10.18452/24860
    URN: urn:nbn:de:kobv:11-110-18452/25535-2
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  • 8
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    Online Resource
    Enhancing urban runoff modelling using water stable isotopes and ages in complex catchments (2023)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_27733
    Format: 1 Online-Ressource (17 Seiten)
    Content: Increased urbanization, coupled with the projected impacts of climatic change, mandates further evaluation of the impact of urban development on water flow paths to guide sustainable land-use planning. Though the general urbanization impacts of increased storm runoff peaks and reduced baseflows are well known; how the complex, non-stationary interaction of the dominant water fluxes within dynamic urban water stores sustain streamflow regimes over longer periods of time is less well quantified. In particular, there is a challenge in how hydrological modelling should integrate the juxtaposition of rapid and slower flow pathways of the urban ‘karst’ landscape and different approaches need evaluation. In this context, we utilized hydrological and water stable isotope datasets within a modelling framework that combined the commonly used Hydrologic Engineering Center Hydrological Modelling System (HEC-HMS) urban runoff model along with a simple hydrological tracer module and transit time modelling to evaluate the spatial and temporal variation of water flow paths and ages within a heavily urbanized 217 km2 catchment in Berlin, Germany. Deeper groundwater was the primary flow component in the upper reaches of the catchment within fewer urbanized regions, while the addition of wastewater effluent in the mid-reaches of the catchment was the dominant water supply to sustain baseflow in the lower main stem stream, with additional direct storm runoff and shallow subsurface contributions in the more urbanized lower reaches. Water ages from each modelling approach mirrored flow contributions and water age mixing potential in subsurface storage; with older average water and lower young water contributions in less urbanized sub-catchments and younger average water and higher young water contributions in more urbanized regions. The results from the first step towards more integrated tracer-aided hydrologic modelling tools for similar peri-urban catchments, given the potential limitations of simpler model frameworks. The results have broader implications for assessing the uncertainty in evaluating urban impacts on hydrological function under environmental change.
    Content: Peer Reviewed
    In: New York, NY : Wiley, 37,2
    Language: English
    DOI: 10.1002/hyp.14814
    DOI: 10.18452/27044
    URN: urn:nbn:de:kobv:11-110-18452/27733-3
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    HU Berlin
  • 9
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    Online Resource
    Spatially distributed tracer-aided runoff modelling and dynamics of storage and water ages in a permafrost-influenced catchment (2019)
    Berlin : Humboldt-Universität zu Berlin
    Details
    UID:
    edochu_18452_21386
    Format: 1 Online-Ressource (17 Seiten)
    ISSN: 1027-5606 , 1027-5606
    Content: Permafrost strongly controls hydrological processes in cold regions. Our understanding of how changes in seasonal and perennial frozen ground disposition and linked storage dynamics affect runoff generation processes remains limited. Storage dynamics and water redistribution are influenced by the seasonal variability and spatial heterogeneity of frozen ground, snow accumulation and melt. Stable isotopes are potentially useful for quantifying the dynamics of water sources, flow paths and ages, yet few studies have employed isotope data in permafrost-influenced catchments. Here, we applied the conceptual model STARR (the Spatially distributed Tracer-Aided Rainfall–Runoff model), which facilitates fully distributed simulations of hydrological storage dynamics and runoff processes, isotopic composition and water ages. We adapted this model for a subarctic catchment in Yukon Territory, Canada, with a timevariable implementation of field capacity to include the influence of thaw dynamics. A multi-criteria calibration based on stream flow, snow water equivalent and isotopes was applied to 3 years of data. The integration of isotope data in the spatially distributed model provided the basis for quantifying spatio-temporal dynamics of water storage and ages, emphasizing the importance of thaw layer dynamics in mixing and damping the melt signal. By using the model conceptualization of spatially and temporally variable storage, this study demonstrates the ability of tracer-aided modelling to capture thaw layer dynamics that cause mixing and damping of the isotopic melt signal.
    Content: Peer Reviewed
    Note: This article was supported by the German Research Foundation (DFG) and the Open Access Publication Fund of Humboldt-Universität zu Berlin.
    In: Katlenburg-Lindau : EGU, 23,6, Seiten 2507-2523, 1027-5606
    Language: English
    DOI: 10.18452/20607
    DOI: 10.5194/hess-23-2507-2019
    URN: urn:nbn:de:kobv:11-110-18452/21386-3
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    HU Berlin
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