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FIGURE 13.16 Calculated UV amplification factors attributable to changes in total column 03, S02, and clouds, respectively, at Thessaloniki, Greece (adapted from Bais et al, 1993).

FIGURE 13.16 Calculated UV amplification factors attributable to changes in total column 03, S02, and clouds, respectively, at Thessaloniki, Greece (adapted from Bais et al, 1993).

normally expected (e.g., see Lubin et al., 1989a, 1989b, 1992; Stamnes et al., 1990, 1992; and Beaglehole and Carter, 1992). Figure 13.17, for example, shows the relationship between the radiation amplification factor for the DNA-effective region (Fig. 13.15) and the total column ozone measured at Palmer Station, Antarctica (Lubin et al., 1992). A clear (but nonlinear) relationship is evident. Increased surface UV has also been measured in southern Argentina (e.g., see Frederick et al., 1993; and Bojkov et al., 1995b) and New Zealand (McKenzie et al., 1991; Seckmeyer and McKenzie, 1992), possibly due in part to ozone-depleted air that was processed in the polar vortex.

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