海水温度变暖将促使南极冰雪发生大转变
文章来源:未知 文章作者:enread 发布时间:2012-09-20 06:16 字体: [ ]  进入论坛
(单词翻译:双击或拖选)
Fast-flowing and narrow glaciers2 have the potential to trigger massive changes in the Antarctic ice sheet and contribute to rapid ice-sheet decay and sea-level rise, a new study has found. Research results published in the journal Proceedings3 of the National Academy of Sciences reveal in more detail than ever before how warming waters in the Southern Ocean are connected intimately(熟悉地) with the movement of massive ice-sheets deep in the Antarctic interior.
 
"It has long been known that narrow glaciers on the edge of the Antarctica act as discrete4(不连续的) arteries5 termed ice streams, draining the interior of the ice sheet," says Dr Chris Fogwill, an author of the study and an ARC Future Fellow with the UNSW Climate Change Research Centre.
 
"However, our results have confirmed recent observations suggesting that ocean warming can trigger increased flow of ice through these narrow corridors(走廊). This can cause inland sectors6 of the ice-sheet -- some larger than the state of Victoria -- to become thinner and flow faster."
 
The researchers, led by Dr Nicholas Golledge from Victoria University of Wellington, New Zealand, tested high-resolution model simulations against reconstructions7 of the Antarctic ice sheet from 20,000 years ago, during the last glacial maximum.
 
They used a new model, capable of resolving responses to ice-streams and other fine- scale dynamic features that interact over the entire ice sheet. This had not previously8 been possible with existing models. They then used this data to analyze9 the effects of a warming ocean over time.
 
The results showed that while glacier1 acceleration10 triggered by ocean warming is relatively11 localized, the extent of the resultant ice-sheet thinning is far more widespread. This observation is particularly important in light of recently observed dynamic(动态的) changes at the margins12 of Antarctica. It also highlighted areas that are more susceptible13 than others to changes in ocean temperatures.
 
The glaciers that responded most rapidly to warming oceans were found in the Weddell Sea, the Admundsen Sea, the central Ross Sea and in the Amery Trough.
 
The finding is important because of the enormous scale and potential impact the Antarctic ice sheets could have on sea-level rise if they shift rapidly, says Fogwill. "To get a sense of the scale, the Antarctic ice sheet is 3km deep -- three times the height of the Blue Mountains in many areas -- and it extends across an area that is equivalent to the distance between Perth and Sydney.
 
"Despite its potential impact, Antarctica's effect on future sea level was not fully14 included in the last IPCC report because there was insufficient15 information about the behavior of the ice sheet. This research changes that. This new, high-resolution modelling approach will be critical to improving future predictions of Antarctica's contribution to sea level over the coming century and beyond."


点击收听单词发音收听单词发音  

1 glacier YeQzw     
n.冰川,冰河
参考例句:
  • The glacier calved a large iceberg.冰河崩解而形成一个大冰山。
  • The upper surface of glacier is riven by crevasses.冰川的上表面已裂成冰隙。
2 glaciers e815ddf266946d55974cdc5579cbd89b     
冰河,冰川( glacier的名词复数 )
参考例句:
  • Glaciers gouged out valleys from the hills. 冰川把丘陵地带冲出一条条山谷。
  • It has ice and snow glaciers, rainforests and beautiful mountains. 既有冰川,又有雨林和秀丽的山峰。 来自英语晨读30分(高一)
3 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
4 discrete 1Z5zn     
adj.个别的,分离的,不连续的
参考例句:
  • The picture consists of a lot of discrete spots of colour.这幅画由许多不相连的色点组成。
  • Most staple fibers are discrete,individual entities.大多数短纤维是不联系的单独实体。
5 arteries 821b60db0d5e4edc87fdf5fc263ba3f5     
n.动脉( artery的名词复数 );干线,要道
参考例句:
  • Even grafting new blood vessels in place of the diseased coronary arteries has been tried. 甚至移植新血管代替不健康的冠状动脉的方法都已经试过。 来自《简明英汉词典》
  • This is the place where the three main arteries of West London traffic met. 这就是伦敦西部三条主要交通干线的交汇处。 来自《简明英汉词典》
6 sectors 218ffb34fa5fb6bc1691e90cd45ad627     
n.部门( sector的名词复数 );领域;防御地区;扇形
参考例句:
  • Berlin was divided into four sectors after the war. 战后柏林分成了4 个区。 来自《简明英汉词典》
  • Industry and agriculture are the two important sectors of the national economy. 工业和农业是国民经济的两个重要部门。 来自《现代汉英综合大词典》
7 reconstructions b68a36323018dfe7d6624e864a340794     
重建( reconstruction的名词复数 ); 再现; 重建物; 复原物
参考例句:
  • Multicolored reconstructions have been formed using (black and white) volume holographic plates. 利用黑白体积全息片已经做成了彩色重建象。
  • The method gives ways to evaluate collision speed in traffic accident reconstructions. 该模型为交通事故再现推算碰撞速度提供了有效实用的方法。
8 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
9 analyze RwUzm     
vt.分析,解析 (=analyse)
参考例句:
  • We should analyze the cause and effect of this event.我们应该分析这场事变的因果。
  • The teacher tried to analyze the cause of our failure.老师设法分析我们失败的原因。
10 acceleration ff8ya     
n.加速,加速度
参考例句:
  • All spacemen must be able to bear acceleration.所有太空人都应能承受加速度。
  • He has also called for an acceleration of political reforms.他同时呼吁加快政治改革的步伐。
11 relatively bkqzS3     
adv.比较...地,相对地
参考例句:
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
12 margins 18cef75be8bf936fbf6be827537c8585     
边( margin的名词复数 ); 利润; 页边空白; 差数
参考例句:
  • They have always had to make do with relatively small profit margins. 他们不得不经常设法应付较少的利润额。
  • To create more space between the navigation items, add left and right margins to the links. 在每个项目间留更多的空隙,加左或者右的margins来定义链接。
13 susceptible 4rrw7     
adj.过敏的,敏感的;易动感情的,易受感动的
参考例句:
  • Children are more susceptible than adults.孩子比成人易受感动。
  • We are all susceptible to advertising.我们都易受广告的影响。
14 fully Gfuzd     
adv.完全地,全部地,彻底地;充分地
参考例句:
  • The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气,然后全部呼出。
  • They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。
15 insufficient L5vxu     
adj.(for,of)不足的,不够的
参考例句:
  • There was insufficient evidence to convict him.没有足够证据给他定罪。
  • In their day scientific knowledge was insufficient to settle the matter.在他们的时代,科学知识还不能足以解决这些问题。
TAG标签: ocean ice Antarcic
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