Thanks for the comment. The main variability you see is due to changes in sun elevation angle rather than ozone differences. Differences in ozone between those two sites are quite small. You can see examples by looking at the ozone maps over NZ on the niwa ozone and uv web pages. To find them, do a google search for niwa ozone uv.
Oh I thought Ozone had a larger impact. Which two sites are you referring to - Peru and NZ? So these countries have a similar ozone? I was looking at your graph https://niwa.co.nz/sites/niwa.co.nz/files/uvi_web_plots.pdf and from this graph it seems ozone makes a big impact on the UVI
Sorry. I thought you were referring to the Madonna plot just realeased. My mistake Yes, ozone does have a big effect in general. ....
In the Peak UVI plot from a few weeks back, the main driver is also sun elevation. But ozone differences also have a large effect, as you can see with the extreme UVI values in Antarctica, which occur under the Ozone Hole. You can see the usual ozone pattern in the f;lying carpet plot in my "When did ozone's decline end for you?" posting ... Apart from spring the ozone hole, ozone is lowest near the equator and highest in spring at mid latitudes, especially in the north.
Zim Sherman is right. We used a non-linear scale in the left axis in order to force a close match between SW irradiance and UVI throughout the morning and afternoon periods. Such a good match allowed us to show in a single plot how the cloud enhancement similarly affected two independent measurements. Sorry if it was confusing ;)
Thanks Raul. Yes, it's very confusing. So the y-axis is a power law function, is it? How close to zero does it get at the x-axis shown?
it is useful to overlay ozone density on this map?
Thanks for the comment. The main variability you see is due to changes in sun elevation angle rather than ozone differences. Differences in ozone between those two sites are quite small. You can see examples by looking at the ozone maps over NZ on the niwa ozone and uv web pages. To find them, do a google search for niwa ozone uv.
Oh I thought Ozone had a larger impact. Which two sites are you referring to - Peru and NZ? So these countries have a similar ozone? I was looking at your graph https://niwa.co.nz/sites/niwa.co.nz/files/uvi_web_plots.pdf and from this graph it seems ozone makes a big impact on the UVI
Sorry. I thought you were referring to the Madonna plot just realeased. My mistake Yes, ozone does have a big effect in general. ....
In the Peak UVI plot from a few weeks back, the main driver is also sun elevation. But ozone differences also have a large effect, as you can see with the extreme UVI values in Antarctica, which occur under the Ozone Hole. You can see the usual ozone pattern in the f;lying carpet plot in my "When did ozone's decline end for you?" posting ... Apart from spring the ozone hole, ozone is lowest near the equator and highest in spring at mid latitudes, especially in the north.
Oh, I just realised this UVI chart has the ozone factored in already
Zim Sherman is right. We used a non-linear scale in the left axis in order to force a close match between SW irradiance and UVI throughout the morning and afternoon periods. Such a good match allowed us to show in a single plot how the cloud enhancement similarly affected two independent measurements. Sorry if it was confusing ;)