研究人员成功取样南极洲冰下湖湖水-凯发k8官网

研究人员成功取样南极洲冰下湖湖水
文章来源:未知 文章作者:enread 发布时间:2013-01-30 07:09 字体: [ ] 
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in a first-of-its-kind 1 of science and engineering, a national science foundation (nsf)-funded research team has successfully drilled through 800 meters (2,600 feet) of antarctic ice to reach a subglacial(冰川下的) lake and 2 water and 3 samples that have been 4 from direct contact with the atmosphere for many thousands of years. scientists and drillers with the interdisciplinary whillans ice stream subglacial access research drilling project (wissard) announced jan. 28 local time (u.s. stations in antarctica keep new zealand time) that they had used a customized clean hot-water drill to directly obtain samples from the waters and 5 of subglacial lake whillans.
 
the samples may contain 6 life that has evolved uniquely to survive in conditions of extreme cold and lack of light and 7. studying the samples may help scientists understand not only how life can survive in other extreme 8 on earth, but also on other icy worlds in our solar system.
 
the wissard teams' 9, the researchers said, "hails a new era in polar science, opening a window for future interdisciplinary science in one of earth's last unexplored frontiers."
 
a massive ice sheet, almost two miles thick in places, covers more than 95 percent of the antarctic continent. only in recent decades have airborne and satellite 10 and other mapping technologies revealed that a vast, subglacial system of rivers and lakes exists under the ice sheet. lakes vary in size, with the largest being vostok subglacial lake in the antarctic interior that is comparable in size to lake ontario.
 
wissard targeted a smaller lake (1.2 square miles in area), where several lakes appear linked to each other and may drain to the ocean, as the first project to obtain clean, intact samples of water and sediments from a subglacial lake.
 
the achievement is the 11 of more than a decade of international and national planning and 3 1/2 years of project preparation by the wissard consortium of u.s. universities and two international contributors. there are 13 wissard principal 12 representing eight different u.s. institutions.
 
nsf, which manages the united states antarctic program, provided over $10 million in grants as part of nsf's international polar year 13 to support the wissard science and development of related technologies.
 
the national 14 and space administration's (nasa) cryospheric sciences program, the national oceanic and 15 administration (noaa), and the private gordon and betty moore foundation also provided support for the project.


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1 5kzxp     
n.功绩;武艺,技艺;adj.灵巧的,漂亮的,合适的
参考例句:
  • man's first landing on the moon was a feat of great daring.人类首次登月是一个勇敢的壮举。
  • he received a medal for his heroic feat.他因其英雄业绩而获得一枚勋章。
2 zsyyp     
vt.重新得到,收回;挽回,补救;检索
参考例句:
  • he was determined to retrieve his honor.他决心恢复名誉。
  • the men were trying to retrieve weapons left when the army abandoned the island.士兵们正试图找回军队从该岛撤退时留下的武器。
3 isbyk     
n.沉淀,沉渣,沉积(物)
参考例句:
  • the sediment settled and the water was clear.杂质沉淀后,水变清了。
  • sediment begins to choke the channel's opening.沉积物开始淤塞河道口。
4 bqmztd     
adj.与世隔绝的
参考例句:
  • his bad behaviour was just an isolated incident. 他的不良行为只是个别事件。
  • patients with the disease should be isolated. 这种病的患者应予以隔离。
5 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。
6 ndrxq     
adj.微小的,细微的,极小的,显微的
参考例句:
  • it's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • a plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
7 6a1e1ed248a3ac49744c39cc962fb607     
n.(食品或化学品)营养物,营养品( nutrient的名词复数 )
参考例句:
  • a lack of essential nutrients 基本营养的缺乏
  • nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》
8 94cb0e40a815bea1157ac8aab9a5380d     
n.生态系统( ecosystem的名词复数 )
参考例句:
  • there are highly sensitive and delicately balanced ecosystems in the forest. 森林里有高度敏感、灵敏平衡的各种生态系统。 来自《简明英汉词典》
  • madagascar's ecosystems range from rainforest to semi-desert. 马达加斯加生态系统类型多样,从雨林到半荒漠等不一而足。 来自辞典例句
9 2jkyo     
n.完成,成就,(pl.)造诣,技能
参考例句:
  • the series of paintings is quite an accomplishment.这一系列的绘画真是了不起的成就。
  • money will be crucial to the accomplishment of our objectives.要实现我们的目标,钱是至关重要的。
10 ktuxx     
n.雷达,无线电探测器
参考例句:
  • they are following the flight of an aircraft by radar.他们正在用雷达追踪一架飞机的飞行。
  • enemy ships were detected on the radar.敌舰的影像已显现在雷达上。
11 9ycxq     
n.顶点;最高潮
参考例句:
  • the space race reached its culmination in the first moon walk.太空竞争以第一次在月球行走而达到顶峰。
  • it may truly be regarded as the culmination of classical greek geometry.这确实可以看成是古典希腊几何的登峰造级之作。
12 e970f9140785518a87fc81641b7c89f7     
n.调查者,审查者( investigator的名词复数 )
参考例句:
  • this memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
  • the team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》
13 9ozxz     
n.公事包;文件夹;大臣及部长职位
参考例句:
  • he remembered her because she was carrying a large portfolio.他因为她带着一个大公文包而记住了她。
  • he resigned his portfolio.他辞去了大臣职务。
14 bkvyg     
n.航空术,航空学
参考例句:
  • national aeronautics and space undertakings have made great progress.国家的航空航天事业有了很大的发展。
  • he devoted every spare moment to aeronautics.他把他所有多余的时间用在航空学上。
15 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。
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