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
外语
Aside from water vapour, the four principal greenhouse gases are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and th
Aside from water vapour, the four principal greenhouse gases are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and th
admin
2011-02-03
36
问题
Aside from water vapour, the four principal greenhouse gases are carbon dioxide (CO
2
), methane (CH
4
), nitrous oxide (N
2
O) and the halocarbons or CFCs (gases containing fluorine, chlorine and bromine). These gases—described in more detail here—can remain in the atmosphere for different amounts of time, from months to millennia, and affect the climate on very different timescales.
The lifetime in the air of CO
2
, the most significant man-made greenhouse gas, is probably the most difficult to determine, because there are several processes that remove carbon dioxide from the atmosphere. Between 65% and 80% of CO
2
released into the air dissolves into the ocean over a period of 20-200 years. The rest is removed by slower processes that take up to several hundreds of thousands of years, including chemical weathering and rock formation. This means that once in the atmosphere, carbon dioxide can continue to affect climate for thousands of years.
Methane, by contrast, is mostly removed from the atmosphere by chemical reaction, persisting for about 12 years. Thus although methane is a
potent
greenhouse gas, its effect is relatively short-lived.
Nitrous oxide is destroyed in the stratosphere and removed from the atmosphere more slowly than methane, persisting for around 114 years.
Compounds containing chlorine and/or fluorine (CFCs, HCFCs, HFCs, PFCs) include a huge number of different chemical species, each of which can last in the atmosphere for a specific length of time—from less than a year to many thousands of years. The IPCC has published a comprehensive list of the atmospheric lifetime of the various CFCs and other greenhouse gases.
Water vapour is a very effective absorber of heat energy in the air, but it does not accumulate in the atmosphere in the same way as the other greenhouse gases. This is down to it having a very short atmospheric lifetime, of the order of hours to days, because it is rapidly removed as rain and snow. The amount of water vapour that the atmosphere can hold increases as the atmosphere gets warmer, so the greenhouse properties of water vapour are usually considered to act as part of a feedback loop, rather than a direct cause of climate change.
From The Guardian, January 16, 2012
What section is the passage most probably selected from?
选项
A、environment
B、social issues
C、current affairs
D、scientific revolution
答案
A
解析
本题为主旨题。文章介绍的是造成温室效应的几种气体,它们在空气中停留的时间长度和被消解的过程,所以选项A正确。
转载请注明原文地址:https://jikaoti.com/ti/HoqMFFFM
0
专业英语四级
相关试题推荐
MysisterhasbeentoseveralAfricancountriesaswellasallofEuropethisyear.Bythetimeshe’sthirty,she______almostev
AnEnglishscience-fictionwriter,proposedthatman-made"stationary"satellites______torelayandbroadcastelectromagnetic
Thegreatestrecentsocialchangeshavebeen【C1】______thelivesofwomen.Duringthe20thcenturytherehasbeenaremarkable
Thegreatestrecentsocialchangeshavebeen【C1】______thelivesofwomen.Duringthe20thcenturytherehasbeenaremarkable
MarilynwillnotbeabletocometotheChristmaspartyassheis_____withacold.
The_____crownjewelsarekeptintheTowerofLondon.
Ascientistwhodoesresearchineconomicpsychologyandwhowantstopredictthewayinwhichconsumerswillspendtheirmoney
TheRoleofReligioninKoreanHigherEducationItiswidelybelievedthatreligioustraditions,suchasBuddhism,Confucia
Classificationisauseful______totheorganizationofknowledgeinanyfield.
Asidefromwatervapour,thefourprincipalgreenhousegasesarecarbondioxide(CO2),methane(CH4),nitrousoxide(N2O)andth
随机试题
下列哪项不是肺癌的局部侵犯和压迫症状?()
输血主要的适应证是()
美国医学物理学家学会(AAPM)规定加速器机头旋转等中心误差
患者,男,50岁。因面色苍白、乏力、左上腹不适1年来诊。查体:肝肋下2cm,脾平脐。检测WBC4×109/L,Hb65g/L,PLT160×109/L;外周血见少量幼粒、幼红细胞;骨髓多次穿刺“干抽”。患者的诊断最可能是
患者,男性,60岁。因“右肢乏力伴言语不能2小时”入院。患者近一个月来反复出现右肢乏力、言语不能共3次,每次持续约10分钟后缓解。既往有高血压、糖尿病病史。入院查体:神清,右利手,BP180/105mmHg,血糖10mmol/L,双眼左凝,运动性失语,右鼻
某甲(15岁)与某乙(15岁)多次向其同学某丙兜售毒品,均遭某丙拒绝。某甲和某乙恼羞成怒,遂于一日将某丙强行绑住,给其注射了一针毒品。数日后,某丙主动请求某甲和某乙向其出售毒品,遭到二人的拒绝,同时,某甲和某乙看到某丙携带一名牌手机,心生夺财之意二人遂给某
简述学业成绩检查的方式及基本要求。
在简单的IS—LM模型中,我们假设投资只是实际利率的函数,但投资理论认为投资不仅仅被实际利率所决定,还可能会受到实际产出的影响,也就是实际产出的提高可能会使投资增加。假设在一封闭经济体中,请考虑以下两:种投资函数:其中,a和b都是大于0的系数。(201
Whatisthesmallestpossiblecommonmultipleoftwointegerswhicharebothgreaterthan50?
AsaprobingpsychologistheistheunrivalledmasteramongalllivingBritishandAmericannovelists.Neitherdoanyofhiscol
最新回复
(
0
)