温暖的太平洋可能释放数百万吨海底甲烷-凯发k8官网

温暖的太平洋可能释放数百万吨海底甲烷
文章来源:未知 文章作者:enread 发布时间:2014-12-10 05:48 字体: [ ] 
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off the west coast of the united states, 1 gas is trapped in frozen layers below the seafloor. new research from the university of washington shows that water at intermediate depths is warming enough to cause these carbon deposits to melt, releasing methane into the 2 and surrounding water. researchers found that water off the coast of washington is gradually warming at a depth of 500 meters, about a third of a mile down. that is the same depth where methane transforms from a solid to a gas. the research suggests that ocean warming could be triggering the release of a powerful greenhouse gas.
 
"we calculate that methane equivalent in volume to the deepwater horizon oil spill is released every year off the washington coast," said evan solomon, a uw assistant professor of oceanography. he is co-author of a paper to appear in geophysical research letters.
 
while scientists believe that global warming will release methane from gas hydrates worldwide, most of the current focus has been on deposits in the arctic. this paper estimates that from 1970 to 2013, some 4 million metric tons of methane has been released from hydrate 3 off washington. that's an amount each year equal to the methane from natural gas released in the 2010 deepwater horizon blowout off the coast of louisiana, and 500 times the rate at which methane is naturally released from the seafloor.
 
"methane hydrates are a very large and fragile reservoir of carbon that can be released if temperatures change," solomon said. "i was 4 at first, but when we looked at the amounts, it's significant."
 
methane is the main 5 of natural gas. at cold temperatures and high ocean pressure, it combines with water into a crystal called methane hydrate. the pacific northwest has unusually large deposits of methane hydrates because of its biologically productive waters and strong 6 activity. but coastlines around the world hold deposits that could be similarly vulnerable to warming.
 
"this is one of the first studies to look at the lower-latitude margin," solomon said. "we're showing that intermediate-depth warming could be enhancing methane release."


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1 t1eyx     
n.甲烷,沼气
参考例句:
  • the blast was caused by pockets of methane gas that ignited.爆炸是由数袋甲烷气体着火引起的。
  • methane may have extraterrestrial significance.甲烷具有星际意义。
2 8b3acb612b624abdf2c2881bc6928565     
沉淀物( sediment的名词复数 ); 沉积物
参考例句:
  • when deposited, 70-80% of the volume of muddy sediments may be water. 泥质沉积物沉积后,体积的70-80%是水。
  • oligocene erosion had truncated the sediments draped over the dome. 覆盖于穹丘上的沉积岩为渐新世侵蚀所截削。
3 anfzt     
n. 分解, 腐烂, 崩溃
参考例句:
  • it is said that the magnetite was formed by a chemical process called thermal decomposition. 据说这枚陨星是在热分解的化学过程中形成的。
  • the dehydration process leads to fairly extensive decomposition of the product. 脱水过程会导致产物相当程度的分解。
4 mxhwn     
adj.怀疑的,多疑的
参考例句:
  • others here are more skeptical about the chances for justice being done.这里的其他人更为怀疑正义能否得到伸张。
  • her look was skeptical and resigned.她的表情是将信将疑而又无可奈何。
5 epszv     
n.组成部分,成分,元件;adj.组成的,合成的
参考例句:
  • each component is carefully checked before assembly.每个零件在装配前都经过仔细检查。
  • blade and handle are the component parts of a knife.刀身和刀柄是一把刀的组成部分。
6 dg3x9     
adj.地质的
参考例句:
  • the red sea is a geologic continuation of the valley.红海就是一个峡谷在地质上的继续发展。
  • delineation of channels is the first step of geologic evaluation.勾划河道的轮廓是地质解译的第一步。
tag标签: coast greenhouse methane
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