Jason E. Box
Byrd Polar Research Center
The Ohio State University, Columbus, Ohio, USA.
box.11@osu.edu
In 2003, I
used an inexpensive webcam to obtain the following image sequences
during blowing snow conditions at ETH/CU 'Swiss Camp' on the Greenland ice sheet. Sequence B is perhaps the best
use of bandwidth.
In Sequence A below, a Coleman fuel can obstructing the flow in front of a 7' high Weather Port. Visible in the far field are barchanoid dunes moing quickly along. Wind speeds were above 10 m/s at 2 m height.
Sequence
A (10.1 Mb, Color, AVI format, 1 frame/ 30 sec)
In Sequence B below, more barchan dune forms are visible
morphing across the surface. Also visible is a Coleman fuel can in the
foreground and a weather tower in the background.
Sequence
B (5.7 Mb,
B&W, AVI
format, 1 frame/
30 sec)
In Sequence C below, more
barchan dune forms are visible morphing across the surface. The sky
became obscured by clouds toward the end of this image sequence.
Sequence
C (5.8 Mb, B&W, AVI format, 1 frame/ 30 sec)
In the sequence featured at the top of this page, the wind is flowing from right to left. Two bamboo stakes in the foreground and snowmobile tracks in the background provide some scale. The image sequence shows the small barchan ripples that transport around an obstruction on the ice-sheet.
another
time lapse sequence
another
time lapse sequence
another
time lapse sequence
