Wednesday, March 12, 2008

Global Warming on Mars?


PARIS: Global warming could be heating Mars four times faster than Earth due to a mutually reinforcing interplay of wind-swept dust and changes in reflected heat from the Sun, according to a study released on Wednesday.

Scientists have long observed a correlation on Mars between its fluctuating temperatures — which range from -87 C to -5 C depending on the season and the location — and the darkening or lightening of swathes of the planet’s surface.

The explanation is in the dirt.

Glistening Martian dust lying on the ground reflects the Sun’s light — and its heat — back into space, a phenomenon called albedo.

But when this reddish dust is churned up by violent winds, the storm-ravaged surface loses its reflective qualities and more of the Sun’s heat is absorbed into the atmosphere, causing temperatures to rise.

Source:- DNA(Daily News and Analysis)

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