Another fairly uniform stratus cloud covered SHEBA ship. This cloud was optically thin enough for ice patterns to be seen in both the visible and IR images. The 3.7 micron, which is a combination of IR emission and solar reflection, showed some small scale (relative to the satellite view) variations in the cloud. This channel is very sensitive to small changes in solar reflection on the top of the cloud.
The lidar showed a very uniform low level cloud for several hours.
The trajectories to SHEBA ship show that the low level air from the surface to 1.5 km came from the Chukchi Sea just south of the ship. The 3.0 km air came from central Siberia while the 6-9 km air came from the northern Siberian coast very far to the west.
The trajectories to Barrow show the surface-1.0 km air coming from the Beaufort Sea to the east. From 1.5 to 9.0 km, the air came from the Bering Sea crossing western Alaska.
