气候变化影响了地球水循环系统
文章来源:未知 文章作者:enread 发布时间:2012-05-22 05:59 字体: [ ]  进入论坛
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A clear change in salinity1(盐度) has been detected in the world's oceans, signalling shifts and an acceleration2 in the global rainfall and evaporation3(蒸发,消失) cycle. In a paper just published in the journal Science, Australian scientists from the Commonwealth4 Scientific and Industrial Research Organisation5 (CSIRO) and the Lawrence Livermore National Laboratory, California, reported changing patterns of salinity in the global ocean during the past 50 years, marking a clear fingerprint6 of climate change.

Lead author, Dr Paul Durack, said that by looking at observed ocean salinity changes and the relationship between salinity, rainfall and evaporation in climate models, they determined7 the water cycle has strengthened by four per cent from 1950-2000. This is twice the response projected by current generation global climate models.

"Salinity shifts in the ocean confirm climate and the global water cycle have changed.

"These changes suggest that arid8 regions have become drier and high rainfall regions have become wetter in response to observed global warming," said Dr Durack, a post-doctoral fellow at the Lawrence Livermore National Laboratory.

With a projected temperature rise of 3ºC by the end of the century, the researchers estimate a 24 per cent acceleration of the water cycle is possible.

Scientists have struggled to determine coherent estimates of water cycle changes from land-based data because surface observations of rainfall and evaporation are sparse9(稀疏的) . However, according to the team, global oceans provide a much clearer picture.

"The ocean matters to climate -- it stores 97 per cent of the world's water; receives 80 per cent of the all surface rainfall and; it has absorbed 90 per cent of the Earth's energy increase associated with past atmospheric10 warming," said co-author, Dr Richard Matear of CSIRO's Wealth from Oceans Flagship.

"Warming of the Earth's surface and lower atmosphere is expected to strengthen the water cycle largely driven by the ability of warmer air to hold and redistribute more moisture(水分,湿度) ."

He said the intensification11 is an enhancement in the patterns of exchange between evaporation and rainfall and with oceans accounting12 for 71 percent of the global surface area the change is clearly represented in ocean surface salinity patterns.

In the study, the scientists combined 50-year observed global surface salinity changes with changes from global climate models and found "robust13 evidence of an intensified14 global water cycle at a rate of about eight per cent per degree of surface warming," Dr Durack said.

Dr Durack said the patterns are not uniform, with regional variations agreeing with the 'rich get richer' mechanism15, where wet regions get wetter and dry regions drier.

He said a change in freshwater availability in response to climate change poses a more significant risk to human societies and ecosystems16 than warming alone.



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1 salinity uYvx9     
n.盐分;咸度;盐浓度;咸性
参考例句:
  • In the sea water sampled the salinity is two parts per thousand.在取样的海水中,盐度为千分之二。
  • In many sedimentary basins the salinity of the formation water increases with depth or compaction.在许多沉积盆地中,地层水的含盐量随深度或压实作用而增高。
2 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。
3 evaporation Pnoxc     
n.蒸发,消失
参考例句:
  • Be careful not to lose too much liquid by evaporation.小心不要因蒸发失去太多水分。
  • Our bodies can sweat,thereby losing heat by evaporation.我们的身体能出汗,由此可以蒸发散热。
4 commonwealth XXzyp     
n.共和国,联邦,共同体
参考例句:
  • He is the chairman of the commonwealth of artists.他是艺术家协会的主席。
  • Most of the members of the Commonwealth are nonwhite.英联邦的许多成员国不是白人国家。
5 organisation organisation     
n.组织,安排,团体,有机休
参考例句:
  • The method of his organisation work is worth commending.他的组织工作的方法值得称道。
  • His application for membership of the organisation was rejected.他想要加入该组织的申请遭到了拒绝。
6 fingerprint 4kXxX     
n.指纹;vt.取...的指纹
参考例句:
  • The fingerprint expert was asked to testify at the trial.指纹专家应邀出庭作证。
  • The court heard evidence from a fingerprint expert.法院听取了指纹专家的证词。
7 determined duszmP     
adj.坚定的;有决心的
参考例句:
  • I have determined on going to Tibet after graduation.我已决定毕业后去西藏。
  • He determined to view the rooms behind the office.他决定查看一下办公室后面的房间。
8 arid JejyB     
adj.干旱的;(土地)贫瘠的
参考例句:
  • These trees will shield off arid winds and protect the fields.这些树能挡住旱风,保护农田。
  • There are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。
9 sparse SFjzG     
adj.稀疏的,稀稀落落的,薄的
参考例句:
  • The teacher's house is in the suburb where the houses are sparse.老师的家在郊区,那里稀稀拉拉有几处房子。
  • The sparse vegetation will only feed a small population of animals.稀疏的植物只够喂养少量的动物。
10 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。
11 intensification 5fb4d5b75a27bb246c651ce88694cc97     
n.激烈化,增强明暗度;加厚
参考例句:
  • The intensification of the immunological response represents the body's natural defense. 增强免疫反应代表身体的自然保卫。 来自辞典例句
  • Agriculture in the developing nations is not irreversibly committed, to a particular pattern of intensification. 发展中国家的农业并没有完全为某种集约化形式所束缚。 来自辞典例句
12 accounting nzSzsY     
n.会计,会计学,借贷对照表
参考例句:
  • A job fell vacant in the accounting department.财会部出现了一个空缺。
  • There's an accounting error in this entry.这笔账目里有差错。
13 robust FXvx7     
adj.强壮的,强健的,粗野的,需要体力的,浓的
参考例句:
  • She is too tall and robust.她个子太高,身体太壮。
  • China wants to keep growth robust to reduce poverty and avoid job losses,AP commented.美联社评论道,中国希望保持经济强势增长,以减少贫困和失业状况。
14 intensified 4b3b31dab91d010ec3f02bff8b189d1a     
v.(使)增强, (使)加剧( intensify的过去式和过去分词 )
参考例句:
  • Violence intensified during the night. 在夜间暴力活动加剧了。
  • The drought has intensified. 旱情加剧了。 来自《简明英汉词典》
15 mechanism zCWxr     
n.机械装置;机构,结构
参考例句:
  • The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
  • The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
16 ecosystems 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
TAG标签: water climate cycle
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