Showing posts with label ice needle. Show all posts
Showing posts with label ice needle. Show all posts

January 24, 2011

Ice




By Eric D'Aleo

Okay, I’ll admit it.

I’m addicted to ice. No, not the ice that accumulates on the deck, which causes me to grab desperately at the railing as I make my way from the front door of the house to the slick driveway where the car awaits for my morning commute. Nor the ice that requires hours of chopping to get a small hole in the pond to investigate what’s happening below. The ice I crave is the kind you get when delicate ice bridges form above winter streams spanning the frigid waters between two snow banks. This ice is so fragile that it seems as if the bridge will melt if you breathe too harshly. The ice I crave slowly flows down from rocky overhangs creating clear, glittering teeth of some fabled monster or forms bars of ice, becoming what I used to tell my children was an “ice jail.” However, what I really yearn for is that special ice feature, the ice cave. Not just any cave, but a rocky overhang that has had a waterfall freeze in front of it, so that you can crawl behind it, completely sealed off from the outside. Even better is when the water is sandwiched between two layers of ice so one layer is frozen on the outside while the other layer is frozen on the inside and yet you can still hear the rushing and gurgling of the water between the two ice layers. Watching the water rush past like this can be mesmerizing while the clear glasslike shapes sparkle in the bluish light. From outside it doesn’t take much imagination to see the overlapping frozen, whitened layers as a giant birthday cake with too much frosting. I’ll admit as I’m getting older, the cold temperatures bother me more than they used to, but with the recent dropping of the temperatures, the ice beckons and I… I have to answer.

January 5, 2011

Ice Needles by Naturalist Eric D'Aleo


It’s amazing what a difference a cold, clear night can make at this time of year. Recently the morning the temperature reached a low of 14 degree Fahrenheit at 6:00 a.m. No cold temperatures set by any means, but the result was spectacular! I was leading the Blue Heron preschoolers on an “exploration” that morning when one of the young girls noticed that the ground seemed to be moving “funny” and sounded “crunchy”. After stopping and looking, sure enough, needle ice had formed about an inch below the duff. As the temperature dropped below freezing during the night, the moisture in the ground that was above freezing was brought to the surface by capillary action. Once at the top, the water froze and expanded, pushing the ground upward where we found it the following morning. After a few minutes of exploration and observation the children were ready to move on. I however, decided to continue to learn more about these and other unusual ice formations. If you would like to learn more, take a look at the link below about ice formation and their daily freeze and thaw cycles at this website by Dr. James R. Carter, Professor Emeritus Geography-Geology Department, Illinois State University: http://my.ilstu.edu/~jrcarter/ice/diurnal/

Photo courtesy of Eric D'Aleo