Open AccessRetrieval of biomass combustion rates and totals from fire radiative power observations: FRP derivation and calibration relationships between biomass consumption and fire radiative energy release
Author(s) -
Wooster M. J.,
Roberts G.,
Perry G. L. W.,
Kaufman Y. J.
Publication year - 2005
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2005jd006318
Subject(s) - radiance , environmental science , radiative transfer , combustion , remote sensing , calibration , radiant energy , biomass (ecology) , trace gas , subpixel rendering , atmospheric sciences , nadir , meteorology , charring , fuel efficiency , atmospheric radiative transfer codes , radiation , satellite , aerospace engineering , geology , materials science , statistics , chemistry , optics , mathematics , physics , organic chemistry , oceanography , pixel , engineering , composite material
Estimates of wildfire aerosol and trace gas emissions are most commonly derived from assessments of biomass combusted. The radiative component of the energy liberated by burning fuel can be measured by remote sensing, and spaceborne fire radiative energy (FRE) measures can potentially provide detailed information on the amount and rate of biomass consumption over large areas. To implement the approach, spaceborne sensors must be able to derive fire radiative power (FRP) estimates from subpixel fires using observations in just one or two spectral channels, and calibration relationships between radiated energy and fuel consumption must be developed and validated. This paper presents results from a sensitivity analysis and from experimental fires conducted to investigate these issues. Within their methodological limits, the experimental work shows that FRP assessments made via independent hyperspectral and MIR radiance approaches in fact show good agreement, and fires are calculated to radiate 14 ± 3% [mean ± 1S.D.] of their theoretically available heat yield in a form capable of direct assessment by a nadir‐viewing MIR imager. The relationship between FRE and fuel mass combusted is linear and highly significant ( r 2 = 0.98, n = 29, p < 0.0001), and FRP is well related to combustion rate ( r 2 = 0.90, n = 178, p < 0.0001), though radiation from the still‐hot fuel bed can sometimes contribute significant FRP from areas where combustion has ceased. We conclude that FRE assessment offers a powerful tool for supplementing existing burned‐area based fuel consumption measures, and thus shows significant promise for enhancing pyrogenic trace gas and aerosol emissions estimates.