The ice was surprising. The air was not too cold — daytime temperatures were probably mid 50s at the 10,000 foot level where the ice formed. Overnight, the temperature was certainly below freezing. But we didn't see the ice on the hike up (or at least didn't notice it), only on the way down, mid to late afternoon. It was in deep shade. I'm guessing that the temperature of the flowing water was close to freezing (coming from higher elevation and averaging the daytime high and night time low). The very dry conditions might have allowed for some evaporative cooling that caused the water temperature to drop a bit further. And maybe there was some radiant cooling to the sky through the thin atmosphere at altitude. It looks like the ice might have been forming by riming — condensation from vapor to form ice.
I started this blog during the first half of 2009, when, along with my wife, Ingrid, and youngest daughter, Daniela, I spent considerable time in Costa Rica and Spain. Here I recorded a summary of my impressions on most days during our travels. The observations are primarily made through the lens of my camera, augmented by a few paragraphs.
After returning to California in June 2009, I decided to continue the blog. Entries when I'm in California will be sporadic; I'll post more frequently when I travel. The goal will be to continue learning and sharing with the subject inspired by what I happened to find visually interesting.
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Thanks for visiting!
Acknowledgment: Here is a big THANK YOU to my friend and colleague, Charlie, for his feedback and encouragement of my photography, especially in connection to my 2006 work in Denmark (not posted here) and my 2009 photos from Costa Rica.
4 comments:
great fall colors!!
It was cold enough for ice in that little cascade???
Clock those miles!!
The ice was surprising. The air was not too cold — daytime temperatures were probably mid 50s at the 10,000 foot level where the ice formed. Overnight, the temperature was certainly below freezing. But we didn't see the ice on the hike up (or at least didn't notice it), only on the way down, mid to late afternoon. It was in deep shade. I'm guessing that the temperature of the flowing water was close to freezing (coming from higher elevation and averaging the daytime high and night time low). The very dry conditions might have allowed for some evaporative cooling that caused the water temperature to drop a bit further. And maybe there was some radiant cooling to the sky through the thin atmosphere at altitude. It looks like the ice might have been forming by riming — condensation from vapor to form ice.
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