Modeling hydrological controls on variations in peat water content, water table depth, and surface energy exchange of a boreal western Canadian fen peatland

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dc.contributor.authorMezbahuddin, M.
dc.contributor.authorGrant, Robert F.
dc.contributor.authorFlanagan, Larry B.
dc.date.accessioned2018-06-27T18:35:45Z
dc.date.available2018-06-27T18:35:45Z
dc.date.issued2016
dc.descriptionSherpa Romeo green journal. Permission to archive final published versionen_US
dc.description.abstractImproved predictive capacity of hydrology and surface energy exchange is critical for conserving boreal peatland carbon sequestration under drier and warmer climates. We represented basic processes for water and O2 transport and their effects on ecosystem water, energy, carbon, and nutrient cycling in a process-based model ecosys to simulate effects of seasonal and interannual variations in hydrology on peat water content, water table depth (WTD), and surface energy exchange of a Western Canadian fen peatland. Substituting a van Genuchten model (VGM) for a modified Campbell model (MCM) in ecosys enabled a significantly better simulation of peat moisture retention as indicated by higher modeled versus measured R2 and Willmot’s index (d) with VGM (R2~0.7, d~0.8) than with MCM (R2~0.25, d~0.35) for daily peat water contents from a wetter year 2004 to a drier year 2009. With the improved peat moisture simulation, ecosys modeled hourly WTD and energy fluxes reasonably well (modeled versus measured R2: WTD ~0.6, net radiation ~0.99, sensible heat >0.8, and latent heat >0.85). Gradually declining ratios of precipitation to evapotranspiration and of lateral recharge to discharge enabled simulation of a gradual drawdown of growing season WTD and a consequent peat drying from 2004 to 2009. When WTD fell below a threshold of ~0.35m below the hollow surface, intense drying of mosses in ecosys caused a simulated reduction in evapotranspiration and an increase in Bowen ratio during late growing season that were consistent with measurements. Hence, using appropriate water desorption curve coupled with vertical-lateral hydraulic schemes is vital to accurately simulate peatland hydrology and energy balance.en_US
dc.description.peer-reviewYesen_US
dc.identifier.citationMezbahuddin, M., Grant, R. F., & Flanagan, L. B. (2016). Modeling hydrological controls on variations in peat water content, water table depth and surface energy exchange of a boreal western Canadian fen peatland. Journal of Geophysical Research (Biogeosciences), 121(8)m 2216-2242. doi:10.1002/2016JG003501en_US
dc.identifier.urihttps://hdl.handle.net/10133/5139
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.publisher.departmentDepartment of Biological Sciencesen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionAlberta Agriculture and Forestryen_US
dc.publisher.institutionUniversity of Albertaen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.subjectFen peatlanden_US
dc.subjectPeat water contenten_US
dc.subjectPeatland hydrology
dc.subjectPeat water content
dc.subjectMoisture retention
dc.subjectPeat drying
dc.subjectEnergy balance
dc.subjectSurface energy exchange
dc.subject.lcshPeatland conservation
dc.subject.lcshHydrology
dc.subject.lcshBioenergetics
dc.titleModeling hydrological controls on variations in peat water content, water table depth, and surface energy exchange of a boreal western Canadian fen peatlanden_US
dc.typeArticleen_US
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