

@mastersthesis {6398,
	title = {Bio-micrometeorological field measurements over heterogeneous surfaces},
	year = {2008},
	note = {3350744},
	school = {University of California, Davis},
	type = {phdPh.{D}.},
	address = {Ann Arbor},
	abstract = {Scientists have left the flat and homogeneous sites where the foundation of micrometeorology was established in order to better describe the complexity and magnitude of ecosystem contributions to the hydrologic and carbon cycles. Despite their acknowledged shortcomings, the techniques currently employed for this work still rely upon site selection criteria which are rarely met. The focus of this dissertation is the development of novel and theoretically sound methods of quantifying the effects of heterogeneity on surface-atmosphere exchange. The primary objectives of this dissertation are: (1) estimate evapotranspiration, the net ecosystem exchange of carbon dioxide, and canopy conductance from a riparian forest, (2) analyze the environmental controls of the above riparian processes, (3) estimate the errors introduced by the limited horizontal extent of the riparian forest, (4) measure horizontal advection and vertical scalar fluxes near the edge of an agricultural canopy, (5) measure energy balance closure near the edge of an agricultural canopy and evaluate the effects of the often-excluded advection terms on the energy budget, and (6) compare measured turbulent statistics and scalar transport to a higher-order closure model that has not been validated due to a lack of available field studies. Chapter 2 focuses on evapotranspiration and CO2 fluxes measured above a riparian Populus fremontii forest. Chapter 3 describes the results of a micrometeorological edge experiment performed in an agricultural crop, and in Chapter 4 the results presented in Chapter 3 are compared to a higher-order closure model. The results of the riparian work demonstrate the importance of local hydrology on the ecosystem fluxes of carbon dioxide and water vapor. The agricultural edge experiment presented in Chapter 3 confirmed that advection can be an important part of the scalar and energy budgets even in typical daytime conditions, and the modeling and scaling techniques applied in Chapter 4 compared well to the observations and were demonstrated to be a viable method of evaluating the magnitude of advection at other sites.},
	keywords = {0329:Ecology, 0425:Biogeochemistry, 0725:Atmospheric sciences, Advection, Atmospheric sciences, Biogeochemistry, Biological sciences, Carbon dioxide flux, Earth sciences, Ecology, Eddy covariance, Energy balance, Evapotranspiration},
	url = {http://search.proquest.com/docview/304657557?accountid=14270},
	author = {Kochendorfer, John}
}
