April 10, 2018
April 8, 2018
New snow has fallen since March 4 and was still hanging around in pieces March 26.
April 7, 2018
Although the temperature in the area never rose above 36 degrees Fahrenheit March 4, the sun was out, dislodging snow and ice from tree branches overhanging the Back Pond.
April 6, 2018
By the time you see this post, spring may have appeared in full in northeast Ohio, but this blog will linger on the transition from winter for a while longer. While the photographs in the previous eight posts were taken in Oberlin (on March 10), the rest of this series features photos taken in Schoepfle Garden. I always make my way down to the Vermilion River by way of the Back Pond. Here’s how the pond looked March 4.
April 4, 2018
Ice had formed on the surface of a pond. A polarizing filter was on the camera lens. The download of photographs was more surprising than usual. I wasn’t thinking of interference colors when I took these photographs, but that’s what was going on. The explanation in the link above is a bit thick, but if you’re keen to know more, there’s more information here and here. (Longtime followers of this blog know that the colors of Leptothrix discophora films—which I photograph ad nauseam—are due to the interference phenomenon and may not be surprised that I raise the topic again.) OK, but here’s a new puzzle for me: Why is the ice forming in shards? Does ice always form that way? Mysteries, mysteries.
April 3, 2018
April 2, 2018
April 1, 2018
March 31, 2018
March 30, 2018
March 29, 2018
Back in Ohio . . .
The word “nestled” comes to mind . . .
April 1, 2017
March 31, 2017
March 30, 2017
March 29, 2017
On another part of Island Pond there was much more ice. . . . If you’ve wondered how ice becomes suspended above the water, as depicted in earlier posts, please see yesterday’s post.
March 28, 2017
Walking over Wildflower Hill from Rock Pond, I saw similar ice patterns on Island Pond.
UPDATE: If you’ve wondered how ice becomes suspended above the water, read below the photograph.
When I couldn’t figure out how ice becomes suspended above the water level, except for the obvious reason, I reached out to two physicists for enlightenment. One wrote back. Below is my question, and an answer from Dr. Chris Baird, who runs a website called Science Questions with Surprising Answers (sciencequestionswithsurprisinganswers.org). Turns out I should not have rejected the obvious reason (story of my life).
Hello, Chris Baird,
Last week I took several photographs around the edges of a nearby pond where ice had formed on twigs and trailing branches a few inches above the water. At first I thought that the ice had formed while the water level was higher, but somehow I don’t think that explains it. Then I wondered if light snow flakes fell on these sticks and branches and didn’t make it all the way to the water. Then they somehow transformed themselves from snow to ice. (Probably also a wrong answer.) Do you know how this happens?
While it’s hard to know for sure from 2D photos, I believe that your first notion is correct. The ice formed on the surface of the water while the water was at a higher level. The ice froze around the stems and became anchored to the stems. As the water level gradually dropped, ice patches away from the stems lowered with the water, staying in contact with the water, and thus melted away when the water warmed up. In contrast, the ice anchored to the stems stayed put when the water level lowered. They therefore lost contact with the water and did not melt when the water warmed up. This explanation is suggested by the disc shapes of the ice and the fact that these discs sit at levels that are good anchor points (i.e. the tips of stems, the junction points of stems, and the points in stems that have a crooked shape). These shapes are complex enough that there may have a been a complex series of events involving partial melting, refreezing, and repeated rising and lowering of the water level.
Snowfall is crystalline in nature and does not form solid chunks of transparent ice on stems. Freezing rain can form ice masses on stems, but it does not form disc shapes at only a few locations. Rather, freezing rains forms a thin layer of ice that coats the entire stem.
– Dr. Baird
March 27, 2017
March 26, 2017
March 25, 2017
March 24, 2017
March 23, 2017
March 21, 2017
March 20, 2017
Continuing my circumnavigation of Rock Pond . . .