Yesterday in the S. Sandwich islands, nice #volcanotrack from Mt Michael seen in #sentinel2. VIS image shows solid cloud deck w/a brighter wake. NIR image shows a brighter wake .
Both images are consistent with the expected impact of volcanic aerosol onto clouds above.
Actually there was a nice #Landsat overpass .
The standard RGB shows no obvious plume coming from the #volcano at the time of the overpass, and nothing obvious in the more general view .
But when looking at the NIR composite, there is a distinctive track of brighter clouds
(#volcanotrack) which is a telltale of clouds contaminated by the volcano.
This coincides with the similar picture taken by the #MODIS
sensor, which has coarser resolution.
Volcanic activity in Mt Michael in the S. Atlantic , a rather long #volcanotrack suggests that such activity has been going on for many hours.
Nighttime image from GOES confirms the activity too.
Volcanic activity this morning in the South Atlantic from Mt Michael in the South Sandwich Islands .
Clearly, it was activr for many hours because the length of the plume (also it was clear in the IR channels of GOES).
Note how the plume becomes indistinguishable from background clouds after a few 100s km (as expressed by the radius of cloud droplets retrieved)
#volcanotrack
a plume in #Semisopochnoi #volcano now
maybe a #volcanotrack , need to wait for the MODIS image.
And the morning after , #volcanic activity in the same complex was visible in MODIS-Terra
#Volcanicactivity in the #Medvezhia (#Moyorodake in Japanese) volcano complex, during the night
This morning MODIS-Terra provide a nice example of #volcanotrack illustrating the Twomey effect, that is , the modification of cloud properties by aerosols provided the active volcano underneath.
Location is Saunders island in the South Atlantic.
Santiago Gassó