Abstract
Abstract. We report on the emission of water vapor from biomass combustion. Concurrent measurements of carbon monoxide and carbon dioxide are used to scale the concentrations of water vapor found, and are referenced to carbon in the biomass. The investigated fuel types include hardwood (oak and African musasa), softwood (pine and spruce, partly with green needles), and African savanna grass. The session-averaged ratio of H2O to the sum of CO and CO2 in the emissions from 16 combustion experiments ranged from 1.2 to 3.7, indicating the presence of water that is not chemically bound. This non-bound biomass moisture content ranged from 33% in the dry African hardwood, musasa, to 220% in fresh pine branches with needles. The moisture content from fresh biomass contributes significantly to the water vapor in biomass burning emissions, and its influence on the behavior of fire plumes and pyro-cumulus clouds needs to be evaluated.
Highlights
Water vapor production from biomass burning is generally considered to have little effect on atmospheric water vapor concentration
We report on the emission of water vapor from biomass combustion
Helas ical reactions during combustion (“combustion moisture”), and (2) the release of fuel moisture that is not chemically bound to the organic molecules of the fuel. This chemically not bound water in biomass is designated as fuel moisture content, and is defined as the weight of water contained in the fuel expressed as a percentage of its oven dry weight
Summary
Water vapor production from biomass burning is generally considered to have little effect on atmospheric water vapor concentration. We report on the emission of water vapor from biomass combustion. This non-bound biomass moisture content ranged from 33% in the dry African hardwood, musasa, to 220% in fresh pine branches with needles.
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