Rare Temperature Inversion Fills Grand Canyon with Fog
For more photos from Friday’s fog, explore the #grandcanyon hashtag.
On Friday, 29 November, visitors to the Grand Canyon in Arizona, USA, were greeted with an unlikely surprise as dense, low-hanging fog filled the canyon’s gorges in a rare atmospheric event.
The phenomenon is known as a temperature inversion, where a layer of hot air at higher altitude prevents colder air and fog underneath from rising. Inversions of this magnitude are thought to occur only about once per decade at the Grand Canyon, and visiting Instagrammers documented the event in force.
These are real snowflakes, photographed by Alexey Kljatov with a macro lens. Truly beautiful stuff in this collection. As a bonus, he’s posted high-res versions too, and they’re all free to download. [flickr]
Today’s spotlight happily goes to a fairly new beautiful Tumblr based art blog dedicated to matching all the Pantone colors to natures beautiful landscapes and everyday life.
Underwater Waterfall in Mauritius
The place is located at the Southwestern tip of the Mauritius island and it is home of some gorgeous terrain, and one of the coolest optical illusions I have ever seen! When viewed from above, a runoff of sand and silt deposits creates the impression of an ‘underwater waterfall’. via likecool
Green Lake (Grüner See) in Styria, Austria, is an amazing place. For half of the year, it’s an underwater village with fish swimming through the branches of trees, a floor covered in grass, benches and bridges.
For the other half, it is over ground. In the frozen winter months the area is almost completely dry and is a favorite site for hikers. As the temperature begins to rise in spring, the ice and snow on the mountaintops begins to melt and runs down into the basin of land below. The waters are at their highest in June when it becomes a mecca for divers keen to explore the rare phenomenon.
Most objects are not particularly aerodynamic or streamlined. When air flows over such bluff bodies, they can shed regular vortices from one side and then the other. This periodic shedding creates a von Karman vortex street, like this one stretching out from Isla Socorro off western Mexico. From the wind’s perspective, the volcanic island forms a blunt disruption to the otherwise smooth ocean. This vortex shedding is seen at smaller scales, as well, in the wind tunnel, in soap films, and in water tunnels. If you’ve ever been outside on a windy day and heard the electrical lines “singing” in the wind, that’s the same phenomena, too. With the right crosswind, radial bicycle spokes will buzz for the same reason as well! (Photo credit: MODIS/NASA Earth Observatory)
Icebergs sometimes have stripes, formed by layers of ice deposited on different conditions. Blue stripes are created when a crevice in the ice sheet fills up with melted water and freezes so quickly that no bubbles form. Green stripes form when an iceberg falls into the sea and a layer of water rich in algae freezes onto the bottom. Brown, black and yellow lines are caused by sediment, picked up when the ice sheet grinds downhill towards the sea.
(Photos: Antarctica Series by Steve Nicol)