南极海水温度几乎不受气候变化影响
文章来源:未知 文章作者:enread 发布时间:2016-05-31 08:29 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
The waters surrounding Antarctica may be one of the last places to experience human-driven climate change. New research from the University of Washington and the Massachusetts Institute of Technology finds that ocean currents explain why the seawater has stayed at roughly the same temperature while most of the rest of the planet has warmed. The study resolves a scientific conundrum1, and an inconsistent pattern of warming often seized on by climate deniers. Observations and climate models show that the unique currents around Antarctica continually pull deep, centuries-old water up to the surface - seawater that last touched Earth's atmosphere before the machine age, and has never experienced fossil fuel-related climate change. The paper is published May 30 in Nature Geoscience.
 
"With rising carbon dioxide you would expect more warming at both poles, but we only see it at one of the poles, so something else must be going on," said lead author Kyle Armour2, a UW assistant professor of oceanography and of atmospheric3 sciences. "We show that it's for really simple reasons, and ocean currents are the hero here."
 
Gale-force westerly winds that constantly whip around Antarctica act to push surface water north, continually drawing up water from below. The Southern Ocean's water comes from such great depths, and from sources that are so distant, that it will take centuries before the water reaching the surface has experienced modern global warming.
 
Other places in the oceans, like the west coast of the Americas and the equator, draw seawater up from a few hundred meters depth, but that doesn't have the same effect.
 
"The Southern Ocean is unique because it's bringing water up from several thousand meters [as much as 2 miles]," Armour said. "It's really deep, old water that's coming up to the surface, all around the continent. You have a lot of water coming to the surface, and that water hasn't seen the atmosphere for hundreds of years."


点击收听单词发音收听单词发音  

1 conundrum gpxzZ     
n.谜语;难题
参考例句:
  • Let me give you some history about a conundrum.让我给你们一些关于谜题的历史。
  • Scientists had focused on two explanations to solve this conundrum.科学家已锁定两种解释来解开这个难题。
2 armour gySzuh     
(=armor)n.盔甲;装甲部队
参考例句:
  • His body was encased in shining armour.他全身披着明晃晃的甲胄。
  • Bulletproof cars sheathed in armour.防弹车护有装甲。
3 atmospheric 6eayR     
adj.大气的,空气的;大气层的;大气所引起的
参考例句:
  • Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
  • Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:点击我更换图片