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Title: Mass and energy exchange of a plantation forest in Scotland using micrometeorological methods
Author: Clement, Robert J.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2004
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This thesis presents the energy, water, and carbon budgets of Sitka spruce plantation forest in Scotland over the period 1997 to 2001. The site microclimate is observed to be strongly influenced by the site’s oceanic climate, and canopy development. Atmospheric structure is observed to affect temporal patterns of microclimatological variables while topography is observed to affect microclimatological and flux measurements. Eddy covariance flux measurement theory and methods are examined and specific inadequacies are addressed. Theoretical aspects of eddy covariance that were examined include signal despiking, coordinate rotation, low frequency contributions, as well as correlations for density fluctuations, angle of attack errors, and sonic temperature determination. An analysis of frequency response correction methods was used to determined if superior methods could be identified. Fluxes of momentum were used to verify existing measures of atmospheric turbulence and analysed to identify canopy structure and growth. Sensible heat fluxes were found to have an unexpected negative bias, only a portion of which can be attributed to instrument error. This bias is found to depend upon topography and wind speed but is apparently unrelated to katabatic flow. Large errors in latent heat flux were caused by enhanced tube attenuation and were corrected using improved frequency response corrections. Interannual variability of momentum and sensible heat flux were closely associated with wind speed variability, while interannual variability of NEE was attributable primarily to radiation. The source of variability of latent heat flux was not clearly identifiable. Missing values of latent heat flux were modelled using a canopy conductance model, which incorporated effects of canopy evaporation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available