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> (3,4) The existence of coronas varies year by year. Some years
> we don't any coronas by some tree and sometimes the coronas
> are very bright and the appearance period last several weeks.
> This is, of cource, more biology than atmospheric optics.
>
I think it would be good idea to check out the weather conditions
when one observes pollen coronas. It may be possible that good
displays are connected to specific meteorologic conditions as well
as other factors. So, observers in coastal regions should check
(from the weather report, for example) if there is sea breeze or
any such phenomena that could cause strong upward motions or strong
vertical mixing. In the inlands the strong convection due to
insolation could be important. There may also be other mechanisms
transporting pollen particles upwards.
This is just a hunch, but it should not be too hard finding out
if there are any specific meteorological conditions connected.
Thus, some notes about weather conditions during pollen corona
displays shouldn't be waste of time or energy.
> I would be interested to know, is there any plans to observe
> this phenomenon eg. in Germany. We have already detected some
> pollen coronas as early as beginning of March. We though to
> origin of these could be alder pollen. For conifer pollen
> coronas Scandinavia and Canada and also mountain regions could
> be optional areas.
>
> If you have any comments, questions, answers to question etc.
> please, give your ideas to METEOPTIC list.
>
> regards,
>
> Veikko Makela
>
>
>
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