Upscaling Hydrological Processes for Land Surface Models With a Two‐Hydrologic‐Variable Model: Application to the Little Washita Watershed

Picourlat, Fanny; Mouche, Emmanuel; Mügler, Claude

doi:10.1029/2021wr030997

Cited by 3 publications

(1 citation statement)

References 53 publications

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“…In this setup, stomatal conductance is the primary driver of transpiration change. Changing the root depth, and including lateral subsurface flows, or including more accurate plant hydraulics would enable more accurate calculation of evaporation (Chang et al 2018, Harper et al 2021, Picourlat et al 2022 and may alter our results by enabling plants to access deeper and locally adjacent soil moisture.…”

Section: Discussionmentioning

confidence: 99%

Hydrometeorological response to afforestation in the UK: findings from a kilometer-scale climate model

Buechel,

Berthou,

Slater

et al. 2024

Environ. Res. Lett.

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Afforestation is of international interest for its positive benefits on carbon storage, ecology, and society, but its impacts on terrestrial and atmospheric processes are still poorly understood. This study presents the first use of a coupled land surface and convection permitting atmospheric model (CPM) to quantify hydrometeorological effects of afforestation across the United Kingdom, focusing on atmospheric processes often missing in hydrological models. Generating a scenario of 93 000 km2 (40%) additional woodland across the UK, the periods of 2042-2052 and 2062-2072 are analyzed. Simulated afforestation alters seasonal and regional UK hydrometeorology. Countrywide runoff increases in all seasons (between 5.4-11 mm and 4.3-8.6% per season) due to elevated subsurface flows from greater soil moisture. Evaporation decreases in summer (-20.6 mm, -10%) but increases in winter (8.1 mm, 15%) whereas rainfall increases throughout all seasons (between 2.2-6.86 mm and 0.9-2.2% per season). Greater winter rainfall is detected along Great Britain’s west coastline as increased surface roughness produces prolonged and heavier rainfall. In the summer, higher albedo increases potential evapotranspiration and reduces near surface specific humidity: water is locked in deeper soil layers as transpiration diminishes and the topsoil dries out. However, the magnitude of hydrometeorological change due to altered land cover is smaller than the uncertainty in local climate change projections. This work sets a precedent in illustrating the impacts of afforestation on hydrology using a high-resolution CPM and highlights the importance of coupled hydrometeorological processes when investigating land cover impacts on hydrological processes.

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Section: Discussionmentioning

confidence: 99%

Hydrometeorological response to afforestation in the UK: findings from a kilometer-scale climate model

Buechel,

Berthou,

Slater

et al. 2024

Environ. Res. Lett.

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Low impact development technologies for mitigating climate change: Summary and prospects

Zhang,

Valeo

2024

NSO

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Hydrological modelling on atmospheric grids: using graphs of sub-grid elements to transport energy and water

Polcher¹,

Schrapffer²,

Dupont³

et al. 2023

Geosci. Model Dev.

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Abstract. Land surface models (LSMs) use the atmospheric grid as their basic spatial decomposition because their main objective is to provide the lower boundary conditions to the atmosphere. Lateral water flows at the surface on the other hand require a much higher spatial discretization as they are closely linked to topographic details. We propose here a methodology to automatically tile the atmospheric grid into hydrological coherent units which are connected through a graph. As water is transported on sub-grids of the LSM, land variables can easily be transferred to the routing network and advected if needed. This is demonstrated here for temperature. The quality of the river networks generated, as represented by the connected hydrological transfer units, are compared to the original data in order to quantify the degradation introduced by the discretization method. The conditions the sub-grid elements impose on the time step of the water transport scheme are evaluated, and a methodology is proposed to find an optimal value. Finally the scheme is applied in an off-line version of the ORCHIDEE (Organising Carbon and Hydrology In Dynamic Ecosystems) LSM over Europe to show that realistic river discharge and temperatures are predicted over the major catchments of the region. The simulated solutions are largely independent of the atmospheric grid used thanks to the proposed sub-grid approach.

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Upscaling Hydrological Processes for Land Surface Models With a Two‐Hydrologic‐Variable Model: Application to the Little Washita Watershed

Cited by 3 publications

References 53 publications

Hydrometeorological response to afforestation in the UK: findings from a kilometer-scale climate model

Hydrometeorological response to afforestation in the UK: findings from a kilometer-scale climate model

Low impact development technologies for mitigating climate change: Summary and prospects

Hydrological modelling on atmospheric grids: using graphs of sub-grid elements to transport energy and water

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