File:Dust and Hydrogen Sulfide along the Namibian Coast.jpg

English: Hydrogen sulphide bubbled upward and dust plumes blew south-westward along the coast of Namibia in mid-June 2010. Slivers of peacock green near the shore betray the presence of hydrogen sulfide emissions. A study published in 2009 found that the frequent hydrogen sulfide emissions in this area result from ocean-current delivery of oxygen-poor water from the north, oxygen-depleting demands of biological and chemical processes in the local water column, and carbon-rich organic sediments under the water column. When the hydrogen sulfide gas reaches oxygen-rich surface waters, pure sulphur precipitates into the water. The yellow colour of sulphur turns the dark blue water green. Near the hydrogen sulphide eruptions, multiple, linear dust plumes extend over the Atlantic. Most of the plumes appear to originate from stream channel sediments, and they retain the pale beige colour characteristic of such sediments.