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I just returned from Iqaluit on Baffin Island. While landing, the
aircraft
flew over the still frozen Frobisher Bay. The wind and Sun had removed
most
of the snow from the surface of the ice and the colour appeared a vivid
green, much like the colour of glacial lakes. The next day I was hiking
on
the tundra just outside the town. There was low cloud covering most of
the
sky. When I reached the top of a small hill overlooking the bay I could
easily see that the bottom of clouds over the bay were green. The clouds
over the land showed more neutral colouration (grey or gray brown). I
took
lots of photos of the effect including sectional panoramas showing the
neutral colouration over the land and the green over the ice. I just sent
my slides to the processors.
I believe the Inuit use this general effect to look for open water, land
or
ice-flows while in their kayaks. I think the common name for the effect
is
cloud maps or cloud blink.
I have also seen and photographed, green light reflected off agricultural
crops onto the bottom of low cloud although the effect was very subtle.
Russell (Russ) D. Sampson
Department of Earth and Atmospheric Sciences
1-26 Earth Sciences Building
University of Alberta
Edmonton, Alberta, Canada
T6G 2E3
Fax: (403)-492-7589
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