tagged w/ Frost
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Louis Black once said that the best job in the world would be the weatherman in San Diego, “How’s the weather today Bob?…Nice.” Now I don’t want to put down our local meteorologists [the new way to de-sexify weatherman], but our people who handle the weather have their work cut out for them and they should get paid more than the same people in San Diego where it’s nice.Louis Black once said that the best job in the world would be the weatherman in San... more
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A tale of a girl and her magical tree whose petals gave her the feeling of winter in the spring for one week only---but it really gave her so much more than that. Really sweet, short, well-written piece that will make you smile and think about your fondest memories. Sort of reminded me of the famous book "The Giving Tree."A tale of a girl and her magical tree whose petals gave her the feeling of winter in... more
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jrn
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added this
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2 years ago
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It’s all about Russia this season and that includes your beauty wardrobe too. In this post our blogger (whose specialty is beauty) gives us cutting edge runway looks that capture the Russian Revolution that has hit our faces for the fall. Colors, smoky eyes and big hair---we’re talking glam to the max! If you love beauty, and want to know what’s happening in the forecast, check this page out so you’re not left out in the cold this coming season. Great pictures from Nars and Marc Jacobs. Looks like an extensive Editorial beauty spread. Really fun and well-written, this is the writers forte.
Blogger has an amazingly eclectic site with everything from beauty, fashion, diary style entries, poetry, life in the magazine world----this girl has everything. Already winner of the prestigious “Blog Of The Day Award” (some people take years to earn this—she’s only had her blog up 6 weeks!) and on top level blog rolls of awesome bloggers, this girl is amazing. A+++++It’s all about Russia this season and that includes your beauty wardrobe too.... more
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jrn
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added this
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2 years ago
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New details about the Martian weather suggest a slightly different mechanism for the wonky ice cap. The complex answer involves an odd interaction between wind, snow and the sun.
Snow and frost
The new study relied on information gleaned from the Planetary Fourier Spectrometer onboard the European Space Agency's Mars Express spacecraft.
Marco Giuranna of the Istituto di Fisica dello Spazio Interplanetario CNR in Rome, Italy, and colleagues measured temperature and other conditions of the Martian atmosphere above the south polar region, along with carbon dioxide accumulation in the southern ice cap.
They found the offsetting process starts with strong eastward winds at Mars' mid-latitudes that blow straight into the Hellas Basin, the largest impact structure on Mars with a diameter of 1,429 miles (2,300 km) and a depth of about 4 miles (7 km). The crater's steep walls deflect the winds and create giant waves in the atmosphere, which on Earth are referred to as Rossby waves. These waves reroute the high-altitude winds on Mars and force weather systems toward the south pole.
In the western hemisphere of Mars, the result is a strong low-pressure system near the south pole, and a high-pressure system in the eastern hemisphere, again near the south pole.
The low-pressure system in the western hemisphere makes for cooler air temperatures. And these temperatures are just right for carbon dioxide to condense into snow. That means in the western hemisphere of the south pole there is a buildup of both snow and frost.
In the high-pressure system in the eastern hemisphere, temperatures are always too warm for snow to fall, so only frost coats the ground there, Giuranna said.
Frost is found across the south polar region on Mars, regardless of hemisphere. "During the polar night [on Mars] you always have condensation of CO2 on the surface. I call it frost," Giuranna told SPACE.com. "When CO2 gas touches the surface it freezes instantaneously."
Sunlight's role
The story is not just one of more ice cover (from snow and frost), however.
The areas that have extensive snow cover reflect more sunlight back into space than does the surface frost. Grains of frost tend to be larger than snow grains and have rougher surfaces. With such rugged texture, the frost traps more sunlight, driving the sublimation.
So the western area of the southern polar cap, built of snow and frost, not only has a larger amount of carbon dioxide ice deposited but also sublimates more slowly during the summer. The western area built of frost disappears completely.
This explains why the residual cap is not symmetrically placed around the south pole, the researchers said.
The research is set to be published in a forthcoming edition of the journal Icarus.New details about the Martian weather suggest a slightly different mechanism for the... more
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rebot
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added this
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3 years ago
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