Portland State University. Department of Physics
Term of Graduation
Date of Publication
Doctor of Philosophy (Ph.D.) in Applied Physics
carbon dioxide, emission inventory, gridded, high resolution, transportation, urban
1 online resource (xxv, 163 pages)
Here we develop a new high resolution inventory of CO2 emissions for the three Oregon counties which comprise the bulk of the City of Portland, Oregon, USA. Locally curated and long-running data collection efforts for on-road traffic activity and emission rates are used to model on-road emissions, and a new survey of the area's natural gas network informs the building energy model. The inventory estimates total emissions of CO2 for each hour of the year 2018 in the on-road, residential, and commercial building sectors at 1 km2 resolution. The onroad inventory compares to within 3% with an independent national scale inventory, and the building inventory displays a good correlation with an independent national inventory (R2 = 0.76). We find 2.34 million tonnes (MT) of CO2 emitted in Multnomah County from on-road in 2018, while the national inventory DARTE finds 2.97 MT of CO2e in 2010 for Multnomah County, and the official City of Portland/Multnomah County inventory finds 3.2 MT of CO2e for 2017 from onroad transportation and construction equipment. The difference between the City’s official estimate of emissions and the gridded inventory’s estimate is in part due to the City of Portland’s reliance on county-level fuel sales, as compared to the gridded inventory's bottom-up estimate of vehicle miles traveled (VMT). This dissertation describes the first high resolution inventories of CO2 created completely using a bottom-up methodology, using local activity data at the road link and building level. These inventories fill a need in the atmospheric modeling community for high spatial and temporal emission information that can be used in measurement-based monitoring and verification of urban-scale greenhouse gas emissions.
©2023 James Eckhardt Powell
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Powell, James Eckhardt, "A Gridded CO2 Emissions Inventory for Portland, OR" (2023). Dissertations and Theses. Paper 6408.