Ice

The old saying says that you should make lemonade when life gives you lemons, so when life gives me cold I take photos of the ice. The one above shows what a little glimpse of sun on a cold, cloudy winter day looks like. There seems to be little real heat coming from it but I suppose if it wasn’t there we’d know what cold was really all about. We’ve seen the temperature fall to as low as -12 °F (-24 °C) so far, and there’s a lot of January left.

In the old house I grew up in the curtains would blow in the breeze even when the windows were closed and frost grew on the windows all winter long, so I grew up admiring all of the different shapes that can be seen in ice. They can be very beautiful and I still admire them.

Ferns, flowers, trees; window frost can take on almost any shape and I’ve always wondered what made them grow in the shapes that they do. I finally found the answer at Snow Crystals.com: “Window frost forms when a pane of glass is exposed to below-freezing temperatures on the outside and moist air on the inside.  Water vapor from the air condenses as frost on the inside surface of the window. Scratches, residual soap streaks, etc., can all change the way the crystals nucleate and grow.”

Fingers of ice suspended above the water of a stream revealed how much the water level had dropped since they formed.

The same drop in water level can be seen along the river, but the ice here shows it in a different way. In rivers and streams ice always seems to start forming on the banks before working its way toward the middle but on lakes and ponds it is just the opposite; it starts forming in the middle and works its way towards shore. I’m sure that the movement of the water in rivers and streams has a lot to do with it, but there must be more to it than that.

Last winter the river rose higher than I’ve ever seen it in this spot due to down river ice jams blocking the flow, and thick ice covered everything that can be seen in this photo. It was like an ice covered wasteland and you couldn’t tell where the land stopped and the water started. Best to stay off that kind of ice.

I thought it was strange that all of the larger stones along the river were coated with ice but the smaller stones weren’t. I would have guessed that it would be the reverse, because it seems like the larger stones would absorb and hold more heat from the sun and keep the water from freezing. Could it be that the larger stones take longer than the smaller ones to absorb that heat?  Just another of nature’s mysteries to add to an ever growing list.

 

Along another small stream I saw more ice needles than I’ve ever seen in one place. There were many millions of them growing out of the gravel, all along its banks. Usually I see ice needles that are coated with the soil that they grow out of but these were surprisingly clean because of the gravel.

They were also the longest ice needles that I’ve seen. Many were 6-8 inches long. When the air temperature is below 32 degrees Fahrenheit right at the soil surface and the soil and groundwater remain thawed, hydrostatic pressure can force the groundwater, sometimes super cooled, out of the soil where it freezes instantly into a “needle.” As more water is forced out of the soil the process is repeated over and over, and each needle grows in length because of more water freezing at its base. From what I’ve seen the needles almost always freeze together and form ribbons like those seen in the above photo.

Ice needles are very fragile, as you can imagine. I wanted to move a leaf so I could get a better shot of some needles but when I moved it the needles went with it. You can see how they’ve attached to the underside of the leaf along with some hoar frost that has grown there. I was surprised to find that ice ribbons weigh next to nothing-little more than the dry leaf they were hanging from, so it must take very little water to make them.

 

The whiter the ice, the more air bubbles were trapped in it when it froze. That explains the color, but what explains the long, needle like crystals and the strange pinging noise it makes when it breaks? There might be answers to those questions out there, but I haven’t been able to find them.

 

Hoarfrost grows whenever it’s cold and there is a source of water vapor nearby. When it is below freezing the water vapor from unfrozen rivers and streams often condenses on the plants all along their banks and covers them in hoarfrost, as this fern leaf shows.

More examples of hoarfrost.  It looks so very delicate that I often have to remind myself to breathe while I’m taking its photo.  One touch of a warm finger, a ray of sunshine, or a warm breath and they’re gone.

Ice can be very abstract. This streamside example had a lot of large bubbles frozen in place and it showed a surprising amount of depth as well as abstraction and it reminded me of the old black and white Twilight Zone TV episodes from the 60s. I can see an eye and a set of teeth and a flying bird and a fish skeleton and several other things in it so you see, ice can even give us the imagination of a child again, at least for a little while. I can’t think of many gifts greater than that one.

Ice can also reveal the hidden groundwater that seems to seep out of the soil year round but is nearly impossible to detect until it freezes. Once winter shows us where it is if we can remember to return to the spot in the summer we might find some interesting plants there. Some orchids, certain liverworts, and other fascinating plants like to grow where water constantly seeps. In this spot the liverwort known as greater whipwort (Bazzania trilobata) grows in abundance.

In this photo the ice seems to be letting us see into the future. I can see a couple of large boulders and even a tree or two being toppled by this stream before too long.  Of course because of the way ice expands it might set things to tumbling before it even has a chance to melt.

Ice burns, and it is hard for the warm-skinned to distinguish one sensation, fire, from the other, frost. ~A.S. Byatt,

Thanks for coming by.

Advertisements