🚀 go-pugleaf

Jonathan Shanklin <j.shanklin@bas.ac.uk> wrote:

>You don't actually say which days in January you were out walking, nor
>which satellite imagery you looked at.  At that time of year polar air
>actually has higher total ozone than tropical air, generally in the
>range 300 to 350 DU.  The general range for Tasmaninia in January seems
>to be 250 - 350 DU.

I am aware that the amount of ozone over Tasmania at that time of the
year is higher than in the tropics.  That is my point.  Ozone
depletion does not result in unusually low levels of ozone at
temperate (populated) latitudes, and therefore doesn't result in
unusually high levels of UV.

>The date for my description in the Antarctic was 1996 November 22nd and
>at this time the total ozone was 180 - 200 DU.

I do not doubt that the low ozone values result in increased UV in
Antarctica.  Only that the actual UV levels are no higher than those
experienced when snow skiing, or relaxing on a tropical beach.  So why
is it important in terms of biological harm.

...Greig