This image is a montage of high resolutions photographs of the Earth taken in January 2012 by the Visible/Infrared Imager Radiometer Suite (VIIRS) instrument on the Suomi NPP satellite. The image shows many stunning details of our home planet - particularly at high resolution. The beauty of our planet is obvious from space - our blue waters, our white clouds, and the green from life abundant at the surface.
Image courtesy of NASA

Earth's Global Climate

Earth's climate is determined by the amount of energy received from the Sun and the amount of energy held in the Earth system - in short, Earth's radiation budget

The Sun emits an enormous amount of energy, in the form of electromagnetic radiation, into space. If we could capture all of that energy and convert it to electricity, we would have more than enough energy to fuel all our needs on this planet, by many time! Most of the Sun's energy flows out of the solar system into interstellar space without ever colliding with anything. A very small fraction of that energy collides with planets, including  Earth, before it can escape into interstellar space. This tiny amount of energy from the Sun that Earth intercepts is sufficient to warm our planet and drive its climate, weather, and support life on Earth. 

There are two main ways that the Sun's energy can vary at Earth - either by changes in the Earth's distance from the Sun or by changes in the amount of energy emitted from the Sun itself. 

Another key factor in determining Earth's climate is the composition of the atmosphere.  As the amount of greenhouse gases in the atmosphere has increased, particularly in recent decades, our atmosphere is warming. 

Finally, the amount of energy reflected away from Earth is a critical factor in determining our climate.  This is called the Earth's albedo.  Surfaces that reflect light - like fresh snow or clouds - reduce the amount of energy that gets into the Earth system.  Because warming leads to melting of ice and snow, a feedback loop develops leading to even further reduction in ice and snow... and more warming.

Last modified August 21, 2013 by Roberta Johnson.

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