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Article: Modeling boreal forest evapotranspiration and water balance at stand and catchment scales: a spatial approach
Title | Modeling boreal forest evapotranspiration and water balance at stand and catchment scales: a spatial approach |
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Authors | |
Issue Date | 2019 |
Publisher | Copernicus GmbH. The Journal's web site is located at http://www.copernicus.org/EGU/hess/hess.html |
Citation | Hydrology and Earth System Sciences, 2019, v. 23, p. 3457-3480 How to Cite? |
Abstract | Vegetation is known to have strong influence onevapotranspiration (ET), a major component of terrestrialwater balance. Yet hydrological models often describe ETby methods unable to include the variability of vegetationcharacteristics in their predictions. To take advantage of theincreasing availability of high-resolution open GIS data onland use, vegetation and soil characteristics in the borealzone, a modular, spatially distributed model for predictingET and other hydrological processes from grid cell to catch-ment level is presented and validated. An improved approachto upscale stomatal conductance to canopy scale using in-formation on plant type (conifer/deciduous) and stand leaf-area index (LAI) is proposed by coupling a common leaf-scale stomatal conductance model with a simple canopy radi-ation transfer scheme. Further, a generic parametrization forvegetation-related hydrological processes for Nordic borealforests is derived based on literature and data from a borealFluxNet site. With the generic parametrization, the modelwas shown to reproduce daily ET measured using an eddy-covariance technique well at 10 conifer-dominated Nordicforests whose LAI ranged from 0.2 to 6.8 m2m−2. Topogra-phy, soil and vegetation properties at 21 small boreal headwa-ter catchments in Finland were derived from open GIS dataat 16 m×16 m grid size to upscale water balance from standto catchment level. The predictions of annual ET and specificdischarge were successful in all catchments, located from 60to 68◦N, and daily discharge was also reasonably well pre-dicted by calibrating only one parameter against dischargemeasurements. The role of vegetation heterogeneity in soilmoisture and partitioning of ET was demonstrated. The pro-posed framework can support, for example, forest traffica-bility forecasting and predicting impacts of climate changeand forest management on stand and catchment water bal-ance. With appropriate parametrization it can be generalizedoutside the boreal coniferous forests. |
Persistent Identifier | http://hdl.handle.net/10722/272874 |
ISSN | 2023 Impact Factor: 5.7 2023 SCImago Journal Rankings: 1.763 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Launiainen, S | - |
dc.contributor.author | Guan, M | - |
dc.contributor.author | Salmivaara, A | - |
dc.contributor.author | Kieloaho, AJ | - |
dc.date.accessioned | 2019-08-06T09:18:11Z | - |
dc.date.available | 2019-08-06T09:18:11Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Hydrology and Earth System Sciences, 2019, v. 23, p. 3457-3480 | - |
dc.identifier.issn | 1027-5606 | - |
dc.identifier.uri | http://hdl.handle.net/10722/272874 | - |
dc.description.abstract | Vegetation is known to have strong influence onevapotranspiration (ET), a major component of terrestrialwater balance. Yet hydrological models often describe ETby methods unable to include the variability of vegetationcharacteristics in their predictions. To take advantage of theincreasing availability of high-resolution open GIS data onland use, vegetation and soil characteristics in the borealzone, a modular, spatially distributed model for predictingET and other hydrological processes from grid cell to catch-ment level is presented and validated. An improved approachto upscale stomatal conductance to canopy scale using in-formation on plant type (conifer/deciduous) and stand leaf-area index (LAI) is proposed by coupling a common leaf-scale stomatal conductance model with a simple canopy radi-ation transfer scheme. Further, a generic parametrization forvegetation-related hydrological processes for Nordic borealforests is derived based on literature and data from a borealFluxNet site. With the generic parametrization, the modelwas shown to reproduce daily ET measured using an eddy-covariance technique well at 10 conifer-dominated Nordicforests whose LAI ranged from 0.2 to 6.8 m2m−2. Topogra-phy, soil and vegetation properties at 21 small boreal headwa-ter catchments in Finland were derived from open GIS dataat 16 m×16 m grid size to upscale water balance from standto catchment level. The predictions of annual ET and specificdischarge were successful in all catchments, located from 60to 68◦N, and daily discharge was also reasonably well pre-dicted by calibrating only one parameter against dischargemeasurements. The role of vegetation heterogeneity in soilmoisture and partitioning of ET was demonstrated. The pro-posed framework can support, for example, forest traffica-bility forecasting and predicting impacts of climate changeand forest management on stand and catchment water bal-ance. With appropriate parametrization it can be generalizedoutside the boreal coniferous forests. | - |
dc.language | eng | - |
dc.publisher | Copernicus GmbH. The Journal's web site is located at http://www.copernicus.org/EGU/hess/hess.html | - |
dc.relation.ispartof | Hydrology and Earth System Sciences | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.title | Modeling boreal forest evapotranspiration and water balance at stand and catchment scales: a spatial approach | - |
dc.type | Article | - |
dc.identifier.email | Guan, M: mfguan@hku.hk | - |
dc.identifier.authority | Guan, M=rp02461 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.5194/hess-23-3457-2019 | - |
dc.identifier.scopus | eid_2-s2.0-85071445197 | - |
dc.identifier.hkuros | 300263 | - |
dc.identifier.volume | 23 | - |
dc.identifier.spage | 3457 | - |
dc.identifier.epage | 3480 | - |
dc.identifier.isi | WOS:000483023900001 | - |
dc.publisher.place | Germany | - |
dc.identifier.issnl | 1027-5606 | - |