Frosty Field and Morning Sunlight

January 11, 2013


Photographer: Piero Armando
Summary Author: Piero Armando; Jim Foster

The photo above shows the effects of sunlight and shade on a frosty soccer field in Turin, Italy. As two local teams took the field on a chilly December morning (temperature of 27 F or -3 C), they had to contend with an overnight deposit of frost. Heat loss from radiational cooling at night causes objects such as grassy surfaces to become colder than the surrounding air. Frost (the solid deposition of water vapor) will then form if the surface is below the frost point. Unless it was protected by the cooling shadows of nearby buildings the frost on this soccer field quickly disappeared in the warm sunshine (sensible heat). Photo taken on December 9, 2012.

Photo details: Camera Maker: Canon; Camera Model: Canon EOS 600D; Lens: EF-S18-55mm f/3.5-5.6 IS II; Focal Length: 55mm; Aperture: f/8.0; Exposure Time: 0.0050 s (1/200); ISO equiv: 400; Software: Adobe Photoshop 7.0.