Title:

Pollutant emission factors data for smoldering conifer forest duff from Oregon

Author(s):

Urbanski, Shawn P.; Kay, Shannon L.; Baker, Stephen P.; Lincoln, Emily N.; Ross, Andrew A.; Blunck, David L.

Publication Year:

2025

How to Cite:

These data were collected using funding from the U.S. Government and can be used without additional permissions or fees. If you use these data in a publication, presentation, or other research product please use the following citation:

Urbanski, Shawn P.; Kay, Shannon L.; Baker, Stephen P.; Lincoln, Emily N.; Ross, Andrew A.; Blunck, David L. 2025. Pollutant emission factors data for smoldering conifer forest duff from Oregon. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2025-0046

Abstract:

Carbonaceous gases and fine particulate matter (PM2.5) from smoldering conifer forest duff were sampled in four bench-scale experimental burns in a combustion facility at Oregon State University. An infrared camera measured surface radiance of the smoldering duff during the burns. The duff was harvested from Douglas-fir forest stands in eastern Oregon in April 2021. Duff samples were burned in May 2021. Samples were 43 centimeters (cm) x 43 cm in area and approximately 4 cm thick. The gases measured were carbon dioxide (CO2), carbon monoxide (CO), methane (CH4), and 19 light (≤ 6 carbon [C]) non-methane hydrocarbons (NMHC). The gas and PM2.5 measurements were used to calculate emission factors (EFX) for each species (mass of X emitted per mass of duff consumed). The IR camera images were processed to provide measurements of surface temperature (T), fire radiative power (FRP), and area of active smoldering for the duff. A Bayesian framework analysis was used to jointly fit an autoregressive model to impute missing T values (T during emission sampling) and a multivariate normal data model to fit five emission factor (EF) responses (EFCO2, EFCO, EFCH4, EFNMHC, and EFPM2.5) to the temperature time series. The Bayesian framework analysis provided best-estimate EF which represent the true EF of the natural, unperturbed smoldering duff along with 95% credible intervals. This data publication includes all observed and Bayesian EF responses at the sample-level as well as summarized to the burn-level.

Keywords:

environment; Fire; Prescribed fire; Smoke; emission factors; smoldering combustion; air quality; Oregon

Related publications:

• Urbanski, Shawn P.; Kay, Shannon L.; Baker, Stephen P.; Lincoln, Emily N.; Ross, Andrew A.; Blunck, David L. 2025. Pollutant emission factors for smoldering conifer forest duff. General Technical Report. RMRS-GTR-444. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 45 p. https://doi.org/10.2737/RMRS-GTR-444

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