Eclectic Perambulations in the Noosphere
Photographer : Trent LaCour
"These angular ice crystals formed on the side of a rock outcrop near Dungeness, on Washington's Olympic Peninsula. This picture was taken in the shaded portion of a gravel pit just after a cold snap -- morning temperatures were in the mid- to upper 20s F (about -3 C). The crystals are approximately three-quarters to one and a quarter inch (20-32 mm) wide. The blue hue of the crystals is attributed to light from the sky, which tints daytime shadows, especially if the sky is clear and the Sun is low -- as was the case this day. Additionally, water and ice are intrinsically bluish since they absorb more in the red portion of the spectrum than in the blue. However, for this inherent coloration to be readily noticeable, the ice would generally need to be much thicker than an inch or so."
"This photo shows randomly oriented elliptical openings in the ice of mostly frozen Utah Lake in northern Utah. It was taken through the open window of a small aircraft flying approximately 1,000 m above the surface on December 27, 2011. Note that despite the orientation of the openings, the biggest has a major axis of perhaps 20 m in length; pale triangles have formed on their lower ends, which are more or less facing the same direction. The apexes of the triangles are pointed toward the southeast -- north is at right. This gives a clue as to their origins; deposits of salt spray from northwest winds.
A number of factors likely come into play to determine the teardrop shape, size and orientation of these holes, including strength, persistence and direction of the wind and the thickness and compression and tension of the ice. Moreover, because Utah Lake is shallow, average depth is about 3 m, strong winds can stir up bottom sediments, which will ultimately affect surface conditions and freeze-up rates. As winter wears on, the holes eventually freeze over, and the lake ice becomes so thick that small aircraft looking for the nearby airport when visibility is poor have been known to mistakenly land on the completely frozen lake surface."
A bizarre underwater "icicle of death" has been filmed by a BBC crew.
With timelapse cameras, specialists recorded salt water being excluded from the sea ice and sinking.
The temperature of this sinking brine, which was well below 0C, caused the water to freeze in an icy sheath around it.
Where the so-called "brinicle" met the sea bed, a web of ice formed that froze everything it touched, including sea urchins and starfish.
by John Adam
"The photo above shows a chunk of scalloped ice, about 65 ft in width that broke off from the Sawyer Glacier near Tracy Arm Fjord in southeastern Alaska. Note the pure blue color emanating from within the “chasm.” The mechanism responsible for producing this robin’s egg blue color, as well as the blue color in deep snow, is essentially the same as that giving deep water its blue color. The longer wavelengths (yellow and red light) present in the incident white sunlight are preferentially absorbed by ice crystals. As a result, what we see is what’s not absorbed -- reflected light that’s dominated by the green and blue portion of the spectrum. In general, the thicker the ice the greater the absorption, and thus the bluer the color."





"Ice crystals form in a wide variety of shapes and sizes: stars, needles, columns and plates. When bright light passes from the sun, moon or an artificial light source through a portion of the sky containing a concentration of ice crystals, magical apparitions often appear. The crystals focus, scatter, bend, split and reflect the light rays into a kaleidoscope of optical phenomena: arcs, glories, halos, pillars and sun dogs." The Weather Doctor
Scientists have produced what they say is the first complete map of how the ice moves across Antarctica.
Built from images acquired by radar satellites, the visualisation details all the great glaciers and the smaller ice streams that feed them.