High-altitude volcanic plume over US
- Thought some of you might be interested in this. The plumes mentioned below are at about 60,000 ft from an Alaskan volcano that erupted last month. It would be interesting to get photos from a balloon around this layer, to see if it's more visible when looking sideways into the layer instead of up/down through it like satellites or ground-based instruments.
73 de Mark N9XTN
From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Scott Bachmeier
Sent: Friday, August 29, 2008 5:38 PM
Subject: [volcanicclouds] Kasatochi plume still seen over Wisconsin (way up there at 19 km) ??
If this is still the Kasatochi plume, then that beast has
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Quick thing of mention that might interest you.
For about a week, there have been 2 aerosol layers at 17
and 19km over the AOS building in Madison. The webpage
thumbnails only go up to 15km, but if you customize the
image to a higher altitude range, you can see the layers.
Ed firmly believes what the HSRL is showing is real, which
reveals low depolarization at a high altitude, with
indications of higher depolarization (5%, but significant)
at the base of it. The idea is that there would have to be
droplets in there with very small particles of ash that
managed to stay aloft, and some traces of sulfuric acid,
which Ed explains is expected to increase with time as the
ash would decrease.
I hope I managed to paraphrase what Ed said.
Here's a link to a 6-hour shot. The 17km layer has faded
some, but the 19km is still sharp.