Emissions and concentrations of hydrogen sulfide in the air of the tropical forest of the Ivory Coast and of temperate regions in France

Abstract

Atmospheric H2S was measured by a fluorometric method (sensitivity 10 rig). In France, for aerated soils the emissions were between 0.8 and 27/•g m -2 h -t H2S (average 5/•g m -2 h-•). The soil temperature is an important factor governing this emission. The H2S concentrations in the air ranged from 0.017 to 0.17 gg m -3 (average 0.080/•g m-3). In the Ivory Coast the H•S emissions were estimated between 30 and 300 p.g m -• h -t. The measured concentrations of H2S in the air at ground level ranged from 0.10 to 8.7 t•g m -3. The relative importance of the measured emissions for anoxic soils of the humid equatorial forests in the global $ cycle is discussed.

The measurement of natural sulfur emissions from soils and vegetation: Three sites in the Eastern United States revisited

“…Measurements of fluxes of volatile sulfur compounds from various surfaces were made using an emission flux chamber similar to those used by Hansen et aL, 1978;Delmas et al, 1980;Adams et aL, 1981;Carroll, 1983;Hill et al, 1978;and Steudler and Peterson, 1984. This technique involves the placement of an open-bottomed enclosure over an area of soil, mud, or water, either including or excluding vegetation as desired, and passing through the enclosure a sweep gas that is usually, but not necessarily, free of the species of interest.…”

Particle-size distribution of inorganic water soluble ions in the venezuelan savannah atmosphere during burning and nonburning periods

“…At present, no determination of the emission of S compounds have been made in Venezuela. Delmas et al (1980) reported an average emission of 1.27 × 10 -7 g H2S-S m -2 s -1 for the savannah region of the Ivory Coast. Considering that a significant fraction of the Venezuelan savannah becomes flooded, a similar or even larger sulphur emission from the soils could be expected during the rainy season.…”

Natural Sulfur Emissions into the Atmosphere

“…Fluxes between 0.001 and 1.1 g S m~2 yr" 1 were reported from marshland soils in the Enis River region of northern Germany. 17 However mean annual fluxes from tropical soils in the Ivory Coast 37 are much higher than those in the U.S. and European soils, ranging between 0.3 to 0.9 g S m~2 yr" 1 . Several recent studies have reported additional data from the earlier U.S. site for the emission rates of biogenic The newer data by Lamb et al 29 and Goldan et al 28 seem to suggest that the sulfur flux appears to have decreased 70 from measurements made earlier.…”