Mesoscale Wind and Temperature Changes over Peatlands of the Hudson Bay Lowlands: impacts on the Surface Energy Balance and Net CO2 Exchange

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dc.contributor.advisorBello, Richard
dc.contributor.authorBalogun, Olalekan Oluleye
dc.date.accessioned2022-03-03T14:04:12Z
dc.date.available2022-03-03T14:04:12Z
dc.date.copyright2021-11
dc.date.issued2022-03-03
dc.date.updated2022-03-03T14:04:12Z
dc.degree.disciplineGeography
dc.degree.levelDoctoral
dc.degree.namePhD - Doctor of Philosophy
dc.description.abstractAlthough northern peatlands in general are currently a net carbon sink, there is still considerable uncertainty in the long-term combined response of plant productivity and ecosystem respiration to global warming and moisture changes. The Hudson Bay Lowlands (HBL) region of Canada is the second largest peat-accumulating complex in the world that is strongly influenced by the cold air masses originating off the Hudson Bay. Recent warming has caused observed changes in the sea ice dynamics and energy budget of the Hudson Bay, yet it is presently unknown how these climatic changes in the Bay will impact the surface energy and carbon balance of the adjacent HBL. As a globally significant peatland carbon pool, the HBL will play an important role in future climate warming and permafrost carbon feedback. The primary aim of this study is to improve our understanding of the warming-induced changes in the advective influence of the Hudson Bay and its linkage to the changes in the surface energy and carbon balance over peatlands of the HBL. I use a combined model and assimilated climate dataset to investigate the mesoscale wind and temperature changes in the HBL and their impacts on the surface energy balance (1979–2018). Furthermore, I employ a satellite data-driven light-use efficiency model, calibrated and validated with eddy covariance tower measurements at a fen and bog to examine the response of net ecosystem CO2 exchange to climatic changes (2000–2019). The results reveal that differential rates of warming between offshore and onshore winds have produced significant changes in the advective role of the Hudson Bay as evident in the increased frequency and strength of onshore winds. Also, the results show contrasting net CO2 exchange between the fen and bog sites. The anomalies in gross primary production and ecosystem respiration were associated with strong trends in temperature and moisture, and the Hudson Bay had a more pronounced advective influence on peatland respiration than photosynthesis.
dc.identifier.urihttp://hdl.handle.net/10315/39107
dc.languageen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectClimate change
dc.subject.keywordsHudson Bay
dc.subject.keywordsHudson Bay Lowlands
dc.subject.keywordsArctic
dc.subject.keywordsArctic amplification
dc.subject.keywordsVPRM
dc.subject.keywordsVegetation Photosynthesis and Respiration Model
dc.subject.keywordsHBL
dc.subject.keywordsFen
dc.subject.keywordsBog
dc.subject.keywordsPeatlands
dc.subject.keywordsChurchill
dc.subject.keywordsAttawapiskat
dc.subject.keywordsSea ice
dc.subject.keywordsGlobal warming
dc.subject.keywordsClimate change
dc.subject.keywordsMesoscale winds
dc.subject.keywordsWind regimes
dc.subject.keywordsOnshore winds
dc.subject.keywordsOffshore winds
dc.subject.keywordsSubarctic
dc.subject.keywordsLUE
dc.subject.keywordsLight-use efficiency
dc.subject.keywordsNARR
dc.subject.keywordsNorth American Regional Reanalysis
dc.subject.keywordsOCO-2
dc.subject.keywordsEddy covariance
dc.subject.keywordsEcosystem respiration
dc.subject.keywordsEnhanced vegetation index
dc.subject.keywordsGross primary production
dc.subject.keywordsER
dc.subject.keywordsGPP
dc.subject.keywordsMODIS
dc.subject.keywordsModerate resolution imaging spectroradiometer
dc.subject.keywordsNet ecosystem exchange
dc.subject.keywordsNEE
dc.subject.keywordsOrbiting Carbon Observatory-2
dc.subject.keywordsPhotosynthetically active radiation
dc.subject.keywordsPAR
dc.subject.keywordsPlant functional type
dc.subject.keywordsPFT
dc.subject.keywordsLatent heat flux
dc.subject.keywordsGround heat flux
dc.subject.keywordsSensible heat flux
dc.subject.keywordsSolar-induced chlorophyll fluorescence
dc.subject.keywordsSIF
dc.subject.keywordsTheil-Sen slope approach
dc.subject.keywordsMann-Kendall
dc.subject.keywordsPermafrost
dc.subject.keywordsSpatial analysis
dc.subject.keywordsTemporal analysis
dc.subject.keywordsTrend analysis
dc.subject.keywordsGlobal cooling
dc.subject.keywordsPeat
dc.subject.keywordsWetlands
dc.subject.keywordsLand-sea contrast
dc.subject.keywordsLand-ocean warming
dc.subject.keywordsPolar bears
dc.subject.keywordsCO2
dc.subject.keywordsCarbon dioxide
dc.subject.keywordsTerrestrial ecosystem model
dc.subject.keywordsSatellite data
dc.subject.keywordsWind frequency
dc.subject.keywordsNorthern peatlands
dc.subject.keywordsCarbon pool
dc.subject.keywordsCarbon storage
dc.subject.keywordsAdvective influence
dc.subject.keywordsGreenhouse effect
dc.subject.keywordsBiosphere
dc.subject.keywordsPermafrost carbon feedback
dc.subject.keywordsCanadian peatlands
dc.subject.keywordsTemperature
dc.subject.keywordsSurface energy balance
dc.subject.keywordsSIF-VPRM
dc.subject.keywordsEVI-VPRM
dc.subject.keywordsEnvironmental controls
dc.subject.keywordsLong-term response
dc.subject.keywordsClimatic trends
dc.subject.keywordsPeatland-optimized model
dc.subject.keywordsCarbon source
dc.subject.keywordsCarbon sink
dc.subject.keywordsCO2 emissions
dc.subject.keywordsCO2 removal
dc.subject.keywordsGrowing season
dc.subject.keywordsClimate anomalies
dc.subject.keywordsHeat flow
dc.subject.keywordsEvapotranspiration
dc.subject.keywordsPrecipitation
dc.subject.keywordsVapour pressure deficit
dc.subject.keywordsVPD
dc.subject.keywordsBoreal forest
dc.subject.keywordsClimatology
dc.subject.keywordsCryosphere
dc.subject.keywordsEarth-surface processes
dc.subject.keywordsOntario
dc.subject.keywordsManitoba
dc.titleMesoscale Wind and Temperature Changes over Peatlands of the Hudson Bay Lowlands: impacts on the Surface Energy Balance and Net CO2 Exchange
dc.typeElectronic Thesis or Dissertation

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