The research aims to produce valid information and must use reliable instruments that guarantee accurate and make it quantifiable and possible reproducibility. Allowing the exclusion or at least control prejudice of personal insights and trends that may distort the results.
lunes, 12 de julio de 2010
Ship Tracks in the Sky
Image courtesy NASA Earth Observatory
Pale arcs in a layer of marine clouds trace the paths of ships in the North Pacific as seen by NASA's Terra satellite in a false-color picture taken in September and released Sunday.
Clouds form when water droplets condense around airborne particles, such as dust and sea salt crystals. Over the open ocean, there are fewer natural particles, so the water droplets that do form tend to grow relatively large.
But air pollution from ship exhaust creates smaller cloud droplets, which are more reflective and thus brighter in the enhanced image.
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