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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE (Open Access)

Comparing two methods to measure oxidative pyrolysis gases in a wind tunnel and in prescribed burns

David R. Weise https://orcid.org/0000-0002-9671-7203 A * , Timothy J. Johnson https://orcid.org/0000-0001-9514-6288 B , Tanya L. Myers https://orcid.org/0000-0001-8995-7033 B , Wei Min Hao https://orcid.org/0000-0002-5604-8762 C , Stephen Baker C , Javier Palarea-Albaladejo https://orcid.org/0000-0003-0162-669X D , Nicole K. Scharko B , Ashley M. Bradley https://orcid.org/0000-0001-7344-9640 B , Catherine A. Banach https://orcid.org/0000-0001-6038-1624 B and Russell G. Tonkyn https://orcid.org/0000-0002-3955-3556 B
+ Author Affiliations
- Author Affiliations

A USDA Forest Service, Pacific Southwest Research Station, Riverside, CA 92507, USA.

B Pacific Northwest National Laboratory, Richland, WA 99352, USA.

C USDA Forest Service, Rocky Mountain Research Station, Missoula, MT 59808, USA.

D Department of Computer Sciences, Applied Mathematics and Statistics, University of Girona, Girona, Spain.

* Correspondence to: david.weise@usda.gov

International Journal of Wildland Fire 32(1) 56-77 https://doi.org/10.1071/WF22079
Submitted: 24 May 2022  Accepted: 28 October 2022   Published: 30 November 2022

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of IAWF. This is an open access article distributed under the Creative Commons Attribution 4.0 International License (CC BY).

Abstract

Background: Fire models use pyrolysis data from ground samples and environments that differ from wildland conditions. Two analytical methods successfully measured oxidative pyrolysis gases in wind tunnel and field fires: Fourier transform infrared (FTIR) spectroscopy and gas chromatography with flame-ionisation detector (GC-FID). Compositional data require appropriate statistical analysis.

Aims: To determine if oxidative pyrolysis gas composition differed between analytical methods and locations (wind tunnel and field).

Methods: Oxidative pyrolysis gas sample composition collected in wind tunnel and prescribed fires was determined by FTIR and GC/FID. Proportionality between gases was tested. Analytical method and location effects on composition were tested using permutational multivariate analysis of variance and the Kruskal–Wallis test.

Key results: Gases proportional to each other were identified. The FTIR composition differed between locations. The subcomposition of common gases differed between analytical methods but not between locations. Relative amount of the primary fuel gases (CO, CH4) was not significantly affected by location.

Conclusions: Composition of trace gases differed between the analytical methods; however, each method yielded a comparable description of the primary fuel gases.

Implications: Both FTIR and GC/FID methods can be used to quantify primary pyrolysis fuel gases for physically-based fire models. Importance of the trace gases in combustion models remains to be determined.

Keywords: compositional data analysis, Fourier transform infrared spectroscopy, FTIR, gas chromatography/flame ionisation detector, gas composition, GC/FID, log-ratio, Pinus palustris.


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