The global freshwater availability and water use model WaterGAP 2.2d

Schmied, Hannes Müller; Cáceres, Denise; Eisner, Stephanie; Flörke, Martina; Niemann, Christoph; Peiris, Thedini Asali; Popat, Eklavyya; Portmann, Felix T.; Reinecke, Robert D.; Schumacher, Maike; Shadkam, Somayeh; Telteu, Camelia Eliza; Trautmann, Tim; Döll, Petra

doi:10.5194/egusphere-egu2020-11434

Cited by 5 publications

(6 citation statements)

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“…This approach is carried out for every grid cell globally and repeated for different climatic conditions and idealized periods of flux variations. Soil texture classes (Figure 4) (Hengl et al., 2017; Hengl, 2018), groundwater recharge from five different sources (Berghuijs et al., 2022; de Graaf et al., 2015, 2017, 2019; Herbert & Döll, 2019; Müller Schmied et al., 2020, 2021; de Graaf, 2022) (Figure 5), and their ensemble mean potential long‐term recharge are used to calculate the damping depth for each grid cell.…”

Section: Methodsmentioning

confidence: 99%

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A Global Assessment of Groundwater Recharge Response to Infiltration Variability at Monthly to Decadal Timescales

Moeck,

Collenteur,

Berghuijs

et al. 2024

Water Resources Research

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Predictions of groundwater fluctuations in space and time are important for sustainable water resource management. Infiltration variability on monthly to decadal timescales leads to fluctuations in the water tables and thus groundwater resources. However, connections between global‐scale climate variability and infiltration patterns and groundwater are often poorly understood because the relationships between groundwater conditions and infiltration tend to be highly nonlinear. In addition, understanding is further hampered because many groundwater records are incomplete and groundwater tables are often anthropogenically influenced, which makes identifying the effects of infiltration variability difficult. Previous studies that have evaluated how infiltration variability controls groundwater are based on a limited number of point measurements. Here, we present a global assessment of how infiltration variability is expected to affect groundwater tables. We use an analytical solution derived from Richards' equation to model water level responses to idealized periodic infiltration variability with periods that range from months to decades, to approximate both the effects of short‐term and long‐term climate variability and thus infiltration patterns. Our global‐scale assessment reveals why infiltration variability would lead to periodicity in groundwater recharge in particular regions. The vadose zone strongly dampens short‐term (seasonal and shorter) variations in infiltration fluxes throughout most of Earth's land surface, while infiltration cycles exceeding 1 year would yield transient recharge, except in more arid regions. Our results may help forecasting long‐term groundwater tables and could support improving groundwater resource management.

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Section: Methodsmentioning

confidence: 99%

“…(2013) and long‐term groundwater recharge rates are from Berghuijs (2022); Herbert and Döll (2019); Müller Schmied et al. (2020); de Graaf et al. (2015, 2022).…”

Section: Data Availability Statementmentioning

confidence: 99%

A Global Assessment of Groundwater Recharge Response to Infiltration Variability at Monthly to Decadal Timescales

Moeck,

Collenteur,

Berghuijs

et al. 2024

Water Resources Research

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“…The TWS data set is available in Müller Schmied et al. (2020). The AI data set is available in Zomer and Trabucco (2019).…”

Section: Data Availability Statementmentioning

confidence: 99%

Recent Water Constraints Mediate the Dominance of Climate and Atmospheric CO₂ on Vegetation Growth Across China

Song,

Penuelas,

Ciais

et al. 2024

Earth's Future

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Multiple lines of evidence confirm a widespread increase in vegetation growth across China over the past few decades. The relationship between vegetation growth and water availability is thought to be becoming stronger under climate change, that is, water constraints on vegetation growth have been increasing. However, our understanding of how water constraints have influenced these vegetation greening trends, especially those climate change‐driven ones, remains limited. Here, we conduct a comprehensive evaluation of recent water constraints and their implications for vegetation growth in China between 1982 and 2015. By analyzing the spatiotemporal patterns of the relationship between vegetation growth and water availability, we reveal recent water constraints and their changes hidden within an overall greening trend in China. Further analysis demonstrates that two climate change‐related categories, defined broadly as “climate” (e.g., air temperature, precipitation, and so on) and “CO2” (i.e., atmospheric carbon dioxide), have exerted varying levels of importance in regulating vegetation growth across different water constraints. With increasing water constraints, the proportion of the climate‐dominated area has significantly risen, while that of the CO2‐dominated area has sharply declined. Our findings highlight that water constraints can mediate the dominance of climate and atmospheric CO2 on vegetation growth. This has the great potential to exacerbate the uncertainty surrounding current and future sustainable vegetation greening trends.

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“…Among the three models, only WGHM includes human‐induced effects of freshwater resources. This contribution is extremely important when accounting for the contribution of freshwater fluxes to the global ocean (Schmied et al., 2020).…”

Section: Data Presentationmentioning

confidence: 99%

Uncertainty of Low‐Degree Space Gravimetry Observations: Surface Processes Versus Earth's Core Signal

et al. 2023

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Space gravity measurements have been mainly used to study the temporal mass variations at the Earth's surface and within the mantle. Nevertheless, mass variations due to the Earth's core might be observable in the gravity field variations as measured by Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow‐On satellites. Earth's core dynamical processes inferred from geomagnetic field measurements are characterized by large‐scale patterns associated with low spherical harmonic degrees of the potential fields. To study these processes, the use of large spatial and inter‐annual temporal filters is needed. To access gravity variations related to the Earth's core, surface effects must be corrected, including hydrological, oceanic or atmospheric loading (Newtonian attraction and mass redistribution). However, these corrections for surface processes add errors to the estimates of the residual gravity field variations enclosing deep Earth's signals. As our goal is to evaluate the possibility to detect signals of core origin embedded in the residual gravity field variations, a quantification of the uncertainty associated with gravity field products and geophysical models used to minimize the surface process signatures is necessary. Here, we estimate the dispersion for GRACE solutions as about 0.34 cm of equivalent water height (EWH) or 20% of the total signal. Uncertainty for hydrological models is as large as 0.89–2.10 cm of EWH. We provide estimates of Earth's core signals whose amplitudes are compared with GRACE gravity field residuals and uncertainties. The results presented here underline how challenging is to get new information about the dynamics of the Earth's core via high‐resolution, high‐accuracy gravity data.

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The global freshwater availability and water use model WaterGAP 2.2d

Cited by 5 publications

References 0 publications

A Global Assessment of Groundwater Recharge Response to Infiltration Variability at Monthly to Decadal Timescales

A Global Assessment of Groundwater Recharge Response to Infiltration Variability at Monthly to Decadal Timescales

Recent Water Constraints Mediate the Dominance of Climate and Atmospheric CO₂ on Vegetation Growth Across China

Uncertainty of Low‐Degree Space Gravimetry Observations: Surface Processes Versus Earth's Core Signal

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The global freshwater availability and water use model WaterGAP 2.2d

Cited by 5 publications

References 0 publications

A Global Assessment of Groundwater Recharge Response to Infiltration Variability at Monthly to Decadal Timescales

A Global Assessment of Groundwater Recharge Response to Infiltration Variability at Monthly to Decadal Timescales

Recent Water Constraints Mediate the Dominance of Climate and Atmospheric CO2 on Vegetation Growth Across China

Uncertainty of Low‐Degree Space Gravimetry Observations: Surface Processes Versus Earth's Core Signal

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Recent Water Constraints Mediate the Dominance of Climate and Atmospheric CO₂ on Vegetation Growth Across China