“…Its evasion from surface soils is relatively uniform and constant and is as described by Jacob et al (1997). Its insolubility and timescale of decay make it a useful tracer for diagnosing quick vertical mixing within atmospheric models from boundary layer processes and moist convection (e.g., Allen et al, 1996;Brost and Chatfield, 1989;Considine et al, 2005;Feichter and Crutzen, 1990;Hauglustaine et al, 2004;Jacob and Prather, 1990;Jacob et al, 1997;Lambert et al, 1982;Mahowald et al, 1995;Stockwell et al, 1998).…”