Figure 8.16: Changes in summertime ozone and peak ultraviolet index at Lauder, Central Ōtago
Return to the point in the document where this figure is located.
Notes:
(1) The upper panel represents changes in summertime ozone and the lower panel peak summertime UV index. The symbols show the average ozone and corresponding noontime measurement of the mean noon UV index for summer’s five highest UV index days in each month (15 days in total). The lines represent average summertime ozone calculated from satellite data, and a corresponding value for UV index calculated from these ozone values.
(2) DU = Dobson units
Source: National Institute of Water and Atmospheric Research.
Text description of figure
This figure shows change in summer time ozone and peak summertime UV index from the summer of 1978/9 until the summer of 2006/7. Concentrations of ozone are calculated from satellite data. Ozone and UV show an inverse relationship. When ozone levels declined from 1978/9 there was an increase in the UV index. From 1989/90 onwards results are also displayed for the five highest UV index days each month and corresponding ozone concentrations for each of these days. Again at the days with high UV index, concentrations of ozone are correspondingly low.
