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[科学美国人60秒] 【整理】SSS 2008-07-02

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[科学美国人60秒] 【整理】SSS 2008-07-02

SSS 2008-07-02

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Tune in every weekday for quick reports and commentaries on the world of science-- it'll just take a minute.


Scientists thought that only bacteria that live where there's no oxygen produced methane, a greenhouse gas. But new research shows that ocean bacteria also give off the gas. Karen Hopkin reports



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【整理】SSS 2008-07-02【整理人】ZPC224

Transcript

 

This is Scientific American's 60-second Science, I am Karen Hopkin. This'll just take a minute.

 

Methane is a greenhouse gas that traps heat even better than carbon dioxide. It comes from a variety of sources, including fossil fuel production and even farming. Cows give off methane, you know, after they eat. Even the surface waters of the ocean contain substantial amounts of this gas. But where marine methane comes from was a mystery. Until now. Scientists collected seawater off the coast of Hawaii. And they found that bacteria that live in these waters scarf up certain phosphorous-containing chemicals, and then release methane as a byproduct. The results appear online in the journal Nature Geoscience. What’s surprising is that scientists had previously thought that methane is only produced by bacteria that live in places where there is no oxygen, think of the smell you associate with a swamp or with the muck at the bottom of a murky pond. This marine methane could contribute to global warming by adding more greenhouse gases to the atmosphere. What’s worse, the hotter it is, the more stressed these seafaring bacteria get, and the more methane they’re likely to put out. Which was certainly not the kind of feedback that atmospheric scientists were hoping to get.

 

 

Thanks for the minute,for Scientific American's 60-Second-Science.I'm Karen Hopkin.

[ 本帖最后由 zpc224 于 2008-7-4 20:55 编辑 ]

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