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Thawing ‘Dry Ice’ Drives Groovy Action on Mars

By Guest PostJanuary 27, 2013Sciencearizona, candice hansen, carbon dioxide sublimation, crism, dark fans, driving factor, dry ice, dynamic process, dynamic world, earth, frozen carbon dioxide, ganna portyankina, groovy action, hirise camera, ice cap, mars, mars reconnaissance orbiter, mars south pole, mars today, martian sand dunes, martian years, NASA, north polar, planetary science institute, seasonal changes, switzerland, thawing, transient grooves, tucson, university, university of bern

PASADENA, Calif. — Researchers using NASA’s Mars Reconnaissance Orbiter see seasonal changes on far-northern Martian sand dunes caused by warming of a winter blanket of frozen carbon dioxide.

Earth has no naturally frozen carbon dioxide, though pieces of manufactured carbon-dioxide ice, called “dry ice,” sublime directly from solid to gas on Earth, just as the vast blankets of dry ice do on Mars. A driving factor in the springtime changes where seasonal coverings of dry ice form on Mars is that thawing occurs at the underside of the ice sheet, where it is in contact with dark ground being warmed by early-spring sunshine through translucent ice. The trapped gas builds up pressure and breaks out in various ways. (more…)

Your Body Doesn’t Lie: People Ignore Political Ads of Candidates They Oppose

By Guest PostSeptember 25, 2012Politics2008 campaign, Ads, alyssa morey, Barack Obama, bodily response, campaign ads, candidate, democratic rival, dynamic process, dynamical, feedback model, heart rate, jatin srivastava, John McCain, political information, presidential, republican, rival candidate, skin conductance, zheng wang

COLUMBUS, Ohio – A recent study examined people’s bodily responses while watching presidential campaign ads – and discovered another way that people avoid political information that challenges their beliefs.

In the last days of the 2008 campaign, researchers had people watch a variety of actual ads for Republican presidential candidate John McCain and his Democratic rival Barack Obama while the viewers’ heart rates, skin conductance and activation of facial muscles were monitored. (more…)

Handful of Heavyweight Trees Per Acre Are Forest Champs

By Guest PostMay 5, 2012Natureandrew larson, biomass, carbon dioxide, dynamic process, fir, incense cedars, james freund, james lutz, little ice age, mark swanson, photosynthesis, plant tissue, sandra hines, sugar, temperate forest, trees, trunk, university of montana, university of washington, washington state university, yosemite national park

Big trees three or more feet in diameter accounted for nearly half the biomass measured at a Yosemite National Park site, yet represented only 1 percent of the trees growing there.

This means just a few towering white fir, sugar pine and incense cedars per acre at the Yosemite site are disproportionately responsible for photosynthesis, converting carbon dioxide into plant tissue and sequestering that carbon in the forest, sometimes for centuries, according to James Lutz, a University of Washington research scientist in environmental and forest sciences. He’s lead author of a paper on the largest quantitative study yet of the importance of big trees in temperate forests being published online May 2 on PLoS ONE. (more…)

Tag Archives: dynamic process

Thawing ‘Dry Ice’ Drives Groovy Action on Mars

Your Body Doesn’t Lie: People Ignore Political Ads of Candidates They Oppose

Handful of Heavyweight Trees Per Acre Are Forest Champs