Polar regions, stratospheric measurements

Observations of inorganic bromine, and specifically BrO, have also been reported (see e.g., Brune et al., 1989 Carroll et al., 1989 Toohey et al., 1990 Avallone et al, 1995 Fish et al, 1997). Figure 5.60 shows some measured mixing ratios of BrO at mid-latitudes and in the polar regions. Values range from typically a few pptv at the tropopause to 10-15 pptv in the middle and upper troposphere. The stratospheric column abundance of BrO has been measured at mid-latitudes by Arpag et al. (1994), in Antarctica by Solomon et al. (1989b), and in the Arctic by Wahner and Schiller (1992). 

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