BurnArea TopSurface

Spectrum Details

Modality

NIR

Category

soil

Material Type

Intimate

Sample ID

WRF00-02

Collection Locality

Walker Ranch Fire, Boulder, Colorado USA

Spectral Purity

1b2_3_4_ # 1= 0.2-3, 2= 1.5-6, 3= 6-25, 4= 20-150 microns

Composition / XRD

XRF # XRF, EPMA, ICP(Trace), WChem

Sample Description

This is not a spectrum of a collected sample but it is an average of 16 field spectra collected of a severely burned area, specifically of the blackened ash/char coated materials on the soil surface following a wildfire in a ponderosa pine forest. The Walker Ranch Fire (also called the Eldorado Fire at Walker Ranch) occurred on September 15, 2000, in an area west of Boulder, Colorado. The field spectra were collected on September 28, 2000. The fiber optic head of the spectrometer was held a few inches above the surface of the charred soil. The field spectra where collected in a 10cm circle (see the area highlighted in red in the sample photo). The average of the 16 field spectra was computed then corrected to absolute reflectance using a National Institute of Standards spectralon correction. Atmospheric absorptions regions were deleted from the final spectrum (data points near 1.4, and 1.9 microns and greater than 2.45 microns were modified in this way to remove all traces of atmospheric residues in the field spectra). Photos:

X Units

cm⁻¹

Y Units

Absorbance

Data Points

2,126