Encore - Ice Roses

November 16, 2019

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Today and every Saturday Earth Science Picture of the Day invites you to rediscover favorites from the past. Saturday posts feature an EPOD that was chosen by viewers like you in our monthly Viewers' Choice polls. Join us as we look back at these intriguing and captivating images.

: Piero Armando
Summary Authors: Piero Armando; Jim Foster

Ferbuary 2014 Viewer's Choice Walking along a little road on a frigid December morning in the Aosta Valley of northwestern Italy, I couldn’t help but notice these delicate Ice roses. It had been quite cold, clear and calm here on several consecutive mornings. The morning temperatures dropped to at least 15 F (-10 C). Such conditions are nearly ideal for promoting ice crystal formation and growth. Crystal growth can occur quite rapidly if adequate water vapor is available to condense onto the incipient flower-like structures. The diameter of the biggest rose at lower center is approximately 1.5 in (4 cm). Photo taken on December 14, 2013.

Photo Details: Camera: Canon EOS 600D; Lens: EF70-300mm f/4-5.6 IS USM; Focal Length: 140mm; Aperture: f/8.0; Exposure Time: 0.0020 s (1/500); ISO equiv: 100.