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And for a better understanding of the global model we need to know: (i) the amount of biogenic H\n            <jats:sub>2<\/jats:sub>\n            S that enters the atmosphere over the continents and coastal areas; (ii) means of distinguishing man-made and biogenic contributions to excess sulfate in air and precipitation; (iii) the volcanic production of sulfur compounds, and their influence on the particle concentration in the stratosphere; (iv) the large-scale atmospheric circulation patterns that exchange air between stratosphere and troposphere (although absolute amounts of sulfate particles involved are small relative to the lower tropospheric burden); (v) the role of the oceans as sources or sinks for SO\n            <jats:sub>2<\/jats:sub>\n            .\n          <\/jats:p>","DOI":"10.1126\/science.175.4022.587","type":"journal-article","created":{"date-parts":[[2006,10,5]],"date-time":"2006-10-05T14:03:38Z","timestamp":1160057018000},"page":"587-596","source":"Crossref","is-referenced-by-count":360,"title":["The Sulfur Cycle"],"prefix":"10.1126","volume":"175","author":[{"given":"W. 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