Cracks in Earth may contribute to global warming

February 20th, 2009 - 12:51 pm ICT by ANI  

Washington, Feb 20 (ANI): A new study has found that the cracks in Earths surface exhale large quantities of gas, perhaps enough to contribute to global warming.

According to a report in Discovery News, Noam Weisbrod of Ben Gurion University of the Negev and a team of researchers monitored a crack about 2 meters long (6.5 feet) and 1 meter (3.3 feet) deep for two years in the Negev Desert in Israel.

Each night, they watched as warm air in the crack drew water vapor out of the surrounding rock, and lifted it into the cold evening air.

If air in the crack is just 7 degrees warmer than the ambient temperature, it is buoyant enough to rise out of any crack in the ground bigger than 1 centimeter (0.4 inch) across, bringing with it any gases that leak out of the surrounding soil or rock.

But, the team was surprised to find that the crack they studied gave off water vapor up to 200 times faster than areas without fractures.

Sometimes we go for walks at night, and you put your face over the mouth of a cave and you can feel a warm wind coming out, Weisbrod said. Usually, its a nice hot wind in the cold air, he added.

Like carbon dioxide, water vapor is a greenhouse gas that plays a crucial role in the way Earth’’s atmosphere traps heat from the sun.

Though the team only measured water vapor, Weisbrod said that its likely that cracks also regularly emit elevated amounts of CO2 and nitrogen oxides.

This doesnt only happen in extremely dry areas, he added.

The Negev is arid, but roughly equivalent in dryness to the area around Los Angeles, California, the American southwest, and many regions around the world.

Fractures are common in soils and rocks in wet regions as well, according to Dan Yakir of the Weizman Institute of Science.

Taken as a whole, emissions from fractures in the uppermost meter of the planets crust may make a significant contribution to greenhouse gases in the atmosphere.

This has the potential to be important globally, Yakir said.

The biosphere soaks up 30 percent of the carbon, and soil respiration is a very large part of that. If cracks remove CO2 from soils much faster than usual, its important, he added. (ANI)

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