地区性冷暖与自然现象息息相关
文章来源:未知 文章作者:meng 发布时间:2009-11-27 00:12 字体: [ ]  进入论坛
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Intervals2(间隔,间歇) of regional warmth and cold in the past are linked to the El Niño(厄尔尼诺) phenomenon and the so-called "North Atlantic Oscillation(北大西洋振荡)" in the Northern hemisphere's jet stream(急流,喷气流), according to a team of climate scientists. These linkages3 may be important in assessing the regional effects of future climate change. "Studying the past can potentially inform our understanding of what the future may hold," said Michael Mann, Professor of meteorology(气象学), Penn State.

Mann stresses that an understanding of how past natural changes have influenced phenomena4 such as El Niño, can perhaps help to resolve current disparities(差距,不一致) between state-of the-art climate models regarding how human-caused climate change may impact this key climate pattern.

Mann and his team used a network of diverse climate proxies5 such as tree ring samples, ice cores, coral and sediments6(沉淀物) to reconstruct spatial7 patterns(立体图,空间图案) of ocean and land surface temperature over the past 1500 years. They found that the patterns of temperature change show dynamic(动态的,有力的) connections to natural phenomena such as El Niño. They report their findings in today's issue (Nov. 27) of Science.

Mann and his colleagues reproduced the relatively8 cool interval1 from the 1400s to the 1800s known as the "Little Ice Age" and the relatively mild conditions of the 900s to 1300s sometimes termed the "Medieval Warm Period."

"However, these terms can be misleading," said Mann. "Though the medieval(中世纪的) period appears modestly(谨慎地,适当地) warmer globally in comparison with the later centuries of the Little Ice Age, some key regions were in fact colder. For this reason, we prefer to use 'Medieval Climate Anomaly' to underscore(强调,下划线) that, while there were significant climate anomalies(反常,异常) at the time, they were highly variable from region to region."

The researchers found that 1,000 years ago, regions such as southern Greenland may have been as warm as today. However, a very large area covering much of the tropical Pacific was unusually cold at the same time, suggesting the cold La Niña(拉尼娜) phase of the El Niño phenomenon.

This regional cooling offset9 relative warmth in other locations, helping10 to explain previous observations that the globe and Northern hemisphere on average were not as warm as they are today.



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1 interval 85kxY     
n.间隔,间距;幕间休息,中场休息
参考例句:
  • The interval between the two trees measures 40 feet.这两棵树的间隔是40英尺。
  • There was a long interval before he anwsered the telephone.隔了好久他才回了电话。
2 intervals f46c9d8b430e8c86dea610ec56b7cbef     
n.[军事]间隔( interval的名词复数 );间隔时间;[数学]区间;(戏剧、电影或音乐会的)幕间休息
参考例句:
  • The forecast said there would be sunny intervals and showers. 预报间晴,有阵雨。
  • Meetings take place at fortnightly intervals. 每两周开一次会。
3 linkages f6a08b944f7078520423ad9f699def40     
n.连接( linkage的名词复数 );结合;联系;联动装置
参考例句:
  • Only the thermosetting resins provide a strong cohesive forces; this is due to molecular cross linkages. 只有热固性树脂具有巨大的凝聚力,这是由于分子交错链所造成的。 来自辞典例句
  • The linkages between the stable units must be as near as possible of equal stability. 稳定链节之间的键必须有尽可能接近的稳定性。 来自辞典例句
4 phenomena 8N9xp     
n.现象
参考例句:
  • Ade couldn't relate the phenomena with any theory he knew.艾德无法用他所知道的任何理论来解释这种现象。
  • The object of these experiments was to find the connection,if any,between the two phenomena.这些实验的目的就是探索这两种现象之间的联系,如果存在着任何联系的话。
5 proxies e2a6fe7fe7e3bc554e51dce24e3945ee     
n.代表权( proxy的名词复数 );(测算用的)代替物;(对代理人的)委托书;(英国国教教区献给主教等的)巡游费
参考例句:
  • SOCKS and proxies are unavailable. Try connecting to XX again? socks和代理不可用。尝试重新连接到XX吗? 来自互联网
  • All proxies are still down. Continue with direct connections? 所有的代理仍然有故障。继续直接连接吗? 来自互联网
6 sediments 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。
7 spatial gvcww     
adj.空间的,占据空间的
参考例句:
  • This part of brain judges the spatial relationship between objects.大脑的这部分判断物体间的空间关系。
  • They said that time is the feeling of spatial displacement.他们说时间是空间位移的感觉。
8 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。
9 offset mIZx8     
n.分支,补偿;v.抵消,补偿
参考例句:
  • Their wage increases would be offset by higher prices.他们增加的工资会被物价上涨所抵消。
  • He put up his prices to offset the increased cost of materials.他提高了售价以补偿材料成本的增加。
10 helping 2rGzDc     
n.食物的一份&adj.帮助人的,辅助的
参考例句:
  • The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
  • By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
TAG标签: climate regional phenomena
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