北极海冰上的积雪正在变薄-凯发k8官网

北极海冰上的积雪正在变薄
文章来源:未知 文章作者:enread 发布时间:2014-08-18 08:24 字体: [ ] 
(单词翻译:双击或拖选)
from research stations drifting on ice floes(冰川) to 1 aircraft 2, scientists have been tracking the depth of snow that accumulates on arctic sea ice for almost a century. now that people are more concerned than ever about what is happening at the poles, research led by the university of washington and nasa confirms that snow has thinned significantly in the arctic, particularly on sea ice in western waters near alaska. a new study, accepted for publication in the journal of geophysical research: oceans, a publication of the american geophysical union, combines data collected by ice 3 and nasa aircraft with historic data from ice floes staffed by 4 scientists from the late 1950s through the early 1990s to track changes over decades.
 
historically, 5 on drifting sea ice used meter sticks and handwritten logs to record snow depth. today, researchers on the ground use an 6 probe similar to a ski pole to verify the accuracy of airborne measurements.
 
"when you stab it into the ground, the basket move up, and it records the distance between the magnet and the end of the probe," said first author melinda webster, a uw graduate student in oceanography. "you can take a lot of measurements very quickly. it's a pretty big difference from the soviet field stations."
 
webster verified the accuracy of airborne data taken during a march 15, 2012 nasa flight over the sea ice near barrow, alaska. the following day webster followed the same track in minus 30-degree temperatures while stabbing through the snow every two to three steps.
 
the authors compared data from nasa airborne surveys, collected between 2009 and 2013, with u.s. army 7 of engineers buoys frozen into the sea ice, and earlier data from soviet drifting ice stations in 1937 and from 1954 through 1991. results showed that snowpack has thinned from 14 inches to 9 inches (35 cm to 22 cm) in the western arctic, and from 13 inches to 6 inches (33 cm to 14.5 cm) in the beaufort and chukchi seas, west and north of alaska.
 
that's a decline in the western arctic of about a third, and snowpack in the beaufort and chukchi seas less than half as thick in spring in recent years compared to the average soviet-era records for that time of year.
 
"knowing exactly the error between the airborne and the ground measurements, we're able to say with confidence, yes, the snow is decreasing in the beaufort and chukchi seas," said co-author ignatius 8, an oceanographer at the uw's 9 physics laboratory.


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1 high-tech     
adj.高科技的
参考例句:
  • the economy is in the upswing which makes high-tech services in more demand too.经济在蓬勃发展,这就使对高科技服务的需求量也在加大。
  • the quest of a cure for disease with high-tech has never ceased. 人们希望运用高科技治疗疾病的追求从未停止过。
2 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。
3 fc4788789ca537c33a2d5ad4b7a567db     
n.浮标( buoy的名词复数 );航标;救生圈;救生衣v.使浮起( buoy的第三人称单数 );支持;为…设浮标;振奋…的精神
参考例句:
  • the channel is marked by buoys. 航道有浮标表示。 来自《现代汉英综合大词典》
  • often they mark the path with buoys. 他们常常用浮标作为航道的标志。 来自辞典例句
4 sw9wr     
adj.苏联的,苏维埃的;n.苏维埃
参考例句:
  • zhukov was a marshal of the former soviet union.朱可夫是前苏联的一位元帅。
  • germany began to attack the soviet union in 1941.德国在1941年开始进攻苏联。
5 95fd70e5832647dcf39beb061b21c75e     
苏维埃(soviet的复数形式)
参考例句:
  • a public challenge could provoke the soviets to dig in. 公开挑战会促使苏联人一意孤行。
  • the soviets proposed the withdrawal of american ballistic-missile submarines from forward bases. 苏联人建议把美国的弹道导弹潜艇从前沿基地撤走。
6 fybzf9     
a.自动化的
参考例句:
  • the entire manufacturing process has been automated. 整个生产过程已自动化。
  • automated highway system (ahs) is recently regarded as one subsystem of intelligent transport system (its). 近年来自动公路系统(automated highway system,ahs),作为智能运输系统的子系统之一越来越受到重视。
7 pzzxv     
n.(通信等兵种的)部队;(同类作的)一组
参考例句:
  • the medical corps were cited for bravery in combat.医疗队由于在战场上的英勇表现而受嘉奖。
  • when the war broke out,he volunteered for the marine corps.战争爆发时,他自愿参加了海军陆战队。
8 as0yi     
n.严酷,严格,严厉
参考例句:
  • their analysis lacks rigor.他们的分析缺乏严谨性。||the crime will be treated with the full rigor of the law.这一罪行会严格依法审理。
9 tz2zxa     
adj.应用的;v.应用,适用
参考例句:
  • she plans to take a course in applied linguistics.她打算学习应用语言学课程。
  • this cream is best applied to the face at night.这种乳霜最好晚上擦脸用。
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