首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
El Nino is the term used for the period when sea surface temperatures are above normal off the South American coast along the eq
El Nino is the term used for the period when sea surface temperatures are above normal off the South American coast along the eq
admin
2009-04-26
79
问题
El Nino is the term used for the period when sea surface temperatures are above normal off the South American coast along the equatorial Pacific, sometimes called the Earth’s heartbeat, and is a dramatic but mysterious climate system that periodically rages across the Pacific.
El Nino means "the little boy" or "the Christ child" in Spanish, and is so called because its warm current is felt along coastal Peru and Ecuador around Christmas. But the local warming is just part of an intricate set of changes in the ocean and atmosphere across the tropical Pacific, which covers a third of the Earth’s circumference. Its intensity is such that it affects temperatures, storm tracks and rainfall around the world.
Droughts in Africa and Australia, tropical storms in the Pacific, torrential rains along the Californian coast and lush greening of Peruvian deserts have all been ascribed to the whim of El Nino. Until recently it has been returning about every three to five years. But recently it has become more frequent—for the first time on record it has returned for a fourth consecutive year—and at the same time a giant pool of unusually warm water has settled down in the middle of the Pacific and is showing no signs of moving.
Climatologists don’t yet know why, though some are saying these aberrations may signal a worldwide change in climate. The problem is that nobody really seems sure what causes the El Nin o to start up, and what makes some stronger than others. And this makes it particularly hard to explain why it has suddenly started behaving so differently.
In the absence of El Nino and its cold counterpart, La Nina, conditions in the tropical eastern Pacific are the opposite of those in the west. the east is cool and dry, while the west is hot and wet. In the east, it’s the winds and currents that keep things cool. It works like this. Strong, steady winds, called trade winds, blowing west across the Pacific drag the surface water along with them. The varying influence of the Earth’s rotation at different latitudes, known as the Coriolis effect, causes these surface winds and water to veer towards the poles, north in the northern hemisphere and south in the southern hemisphere. The surface water is replaced by colder water from deeper in the ocean in a process known as upwelling.
The cold surface water in turn chills the air above it. This cold dense air cannot rise high enough for water vapor to condense into clouds. The dense air creates an area of high pressure so that the atmosphere over the equatorial eastern Pacific is essentially devoid of rainfall.
选项
A、a description of a scene.
B、a root cause of El Nino.
C、a narrative of an event.
D、a definition of EI Nino.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/HGa4777K
0
考研英语一
相关试题推荐
SomecallittheSmartShooter,anewrifleforAmericaninfantrytroopsthatistwoweaponsinone,isaccurateupto1,000yar
SomecallittheSmartShooter,anewrifleforAmericaninfantrytroopsthatistwoweaponsinone,isaccurateupto1,000yar
"What’sthedifferencebetweenGodandLarryEllison?"asksanoldsoftwareindustryjoke.Answer:Goddoesn’tthinkhe’sLarry
Shortlybeforehediedoflymphoma,thegreatwriterandphysicianLewisThomas,whosebooksturnedscienceintoawayofapprec
Anecdotalevidencehaslongheldthatcreativityinartistsandwriterscanbeassociatedwithlivinginforeignparts.Rudyard
HeartdiseasehaslongbeenBritain’sbiggestsinglekiller.Despiteoureffortstowardoffitsriskfactorswithmoreexercise
NowthatmembersofGenerationZaregraduatingcollegethisspring—themostcommonly-accepteddefinitionsaysthisgeneration
NowthatmembersofGenerationZaregraduatingcollegethisspring—themostcommonly-accepteddefinitionsaysthisgeneration
FrankSinatraknewhewasgettingarawdeal.Hecouldsingbuthewasnotmuchofasongwriter,soheneversawacentwhenmos
Shortstoriesareduearevival.Inrecentyears,therehavebeencritically【C1】________collectionsbyAmericanwriterssuchas
随机试题
女性,54岁。优秀话务员,近几年怀疑丈夫有外遇,看电视时激动,控制不住,外出走失1周找不到自己家,住在露天,公安人员收留送回家,吃饭用手抓着吃,记忆力下降,行为幼稚。既往高血压7年,脑梗死后10个月,神经系统检查:BP225/110mmHg,说话口齿不清,
Forinstance,wheninanewsituation,anintelligentpersonthinksaboutthesituation,notabouthimselforwhatmighthappent
特发性血小板减少性紫癜的主要出血部位是
建筑安装工程费用定额一般包括()。
某项贷款年利率为8%,银行要求的补偿性余额维持在25%水平基础上。那么该贷款的实际利率是()。
一、注意事项1.申论考试与传统的作文考试不同,是分析驾驭材料的能力与表达能力并重的考试。2.作答参考时限:阅读资料40分钟,作答110分钟。3.仔细阅读给定的资料,按照后面提出的“申论要求”依次作答在答题纸指定位置。4.答题时请认准题号,避免答错位
某刑事人类学家在对260名杀人犯的外貌进行了考察后,发现他们具有一些共同的生理特征,于是得出“杀人犯具有广颚、颧骨凸出、头发黑而短特征”的结论。以下哪项与上述推理方式相同?
研究表明,高胆固醇高脂肪的饮食习惯能够导致心脑血管疾病。法国人喜欢美食,吃的高胆固醇高脂肪的食物不少,比如鹅肝、鱼子酱,得心血管疾病的比例却比其他国家要低—这个现象被称为“法国悖论”。以下哪项如果为真,最无助于解释“法国悖论”?
Howlongyoulivehasalottodowithyourenvironmentandlifestyle,butexceptionallongevitymayhaveevenmoretodowithy
Inthissection,youareaskedtowriteanessaybasedonthefollowingtable.Describethetableandstateyouropinion.Yoush
最新回复
(
0
)