Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2413l&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 12, p. 2413-2416
Physics
5
Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Geochemical Cycles, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques
Scientific paper
At Trinidad, California we observed elevated CO2 concentrations and concomitant lowered O2 levels coincident with forest fires 70 km distant (from 10/8/99 to 10/21/99). The precision of our O2 data, +/-1 μmol O2/mol dry air, revealed the reduction of atmospheric oxygen resulting from the combustion of biomass, and the stoichiometric ratios (-O2/CO2) of the wildfire emissions. Estimates of daily -O2/CO2 ratios were obtained by regression of CO2 against corresponding O2 data (R2 0.86 to 0.96). Daily -O2/CO2 ratios changed from 1.15 to 1.41 on a particularly smoky day that coincided with elevated levels of CH4 and increased CH4/CO2 ratios. The change to a higher ratio during smoky conditions illustrates the association between changing emissions and -O2/CO2 ratios, possibly due to changing wildfire dynamics.
Dubey Manvendra K.
Keeling Ralph F.
Lueker Timothy J.
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