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
Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphe
Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphe
admin
2013-01-22
30
问题
Climatic conditions are delicately adjusted to the composition of the Earth’s atmosphere. If there were a change in the atmosphere for example, in the relative proportions of atmosphere gases the climate would probably change also. A slight increase in water vapor, for instance, would increase the heat-retaining capacity of the atmosphere and would lead to a rise in global temperatures. In contrast, a large increase in water vapor would increase the thickness and extent of the cloud layer, reducing the amount of solar energy reaching the Earth’s surface.
The level of carbon dioxide, CO2, in the atmosphere has an important effect on climatic change. Most of the Earth’s incoming energy is short wavelength radiation, which tends to pass through atmospheric CO2 easily. The Earth, however, reradiates much of the received energy as a long wavelength radiation, which CO2 absorbs and then remits toward the Earth. This phenomenon, known as the greenhouse effect, can result in an increase in the surface temperature of a planet. An extreme example of the effect is shown by the Venus, a planet covered by heavy clouds composed mostly of CO2, whose surface temperatures have been measured at 430℃. If the CO2 content of the atmosphere is reduced, the temperature falls. According to one respectable theory, if the atmospheric CO2 concentration were halved, the Earth would become completely covered with ice. Another equally respectable theory, however, states that a halving of the CO2 concentration would lead only to a reduction in global temperatures of 3℃. If, because of an increase in forest fires or volcanic activities, the CO2 content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relies on both the warmth and the availability of CO2, would probably increase. As a consequence, plants would use more and more CO2. Eventually CO2 levels would diminish and the climate, in turn, would become cooler. With reduced temperatures many plants would die; CO2 would thereby be returned to the atmosphere and gradually the temperatures would rise again. Thus, if this process occurred, there might be a long-term oscillation in the amount of CO2 present in the atmosphere, with regular temperature increases and decreases of a set magnitude.
Some climatologists argue that the burning of fossil fuels has raised the level of CO2 in the atmosphere and has caused a global temperature rise of at least 1℃. But a supposed global temperature rise of 1℃ may in reality be only several regional temperature increases, restricted to areas where there are many meteorological stations and caused simply by shifts in the pattern of atmospheric circulation. Other areas, for example, the Southern Hemisphere oceanic zone, may be experiencing an equivalent temperature decrease that is unrecognized because of the shortage of meteorological recording stations.
Which of the following questions does the passage supply information for answering?
选项
A、Why are projections of the effects of changes in water vapor levels on the climate so inaccurate?
B、What are the steps in the process that takes place as CO2 absorbs long wavelength radiation?
C、How might our understanding of the greenhouse effect be improved if the burning of fossil fuels were decreased?
D、What might cause a series of regular increases and decreases in the amount of CO2 in the atmosphere?
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/IE1O777K
0
考博英语
相关试题推荐
Thinkaboutwhatwouldmakeyoureally,reallyhappy.Moremoney?Wrong.Smiling,well-adjustedkids?Wrongagain.Thefactisw
Hutuextremistsingovernmentorganizedthekillingandusedstateradiostationstourgeordinarypeopletocrushthecockroach
TheALSPACreportisthethirdinrecentyearstofindfeworno______effectsfromconsumingmosttypesofseafoodduringpregn
Sincethedawnofhumaningenuity,peoplehavedevisedevermorecunningtoolstocopewithworkthatisdangerous,boring,burd
LawyerhaveaterriblehabitofusingLatinandindustry____tomystifypeopleandthemselvesmorevaluable.
It’softenamistaketo____appearance:thatpoor-lookingindividualisanythingbutpoor.Infact,heisamillionaire.
Therecenteconomiccrisishasbroughtabouta____inworldtrade.
Shehadrecentlyleftajobandhadhelpedherselftocopiesofthecompany’sclientdata,whichsheintendedto_______instarti
Thechairmanoftheboard_____onmetheunpleasantjobofdismissinggoodworkersthefirmcannolongeraffordtoemploy.
随机试题
下列哪种用药方法是错误的
需立即进行剖宫产术的征象是出现()。
在关系营销的特征中,信息的及时反馈可使关系营销具有动态的应变性,有利于挖掘新的市场机会。信息反馈的及时性表现为:关系营销应该具备一个()系统,以连接关系双方。
试述政府在社会主义市场经济条件下的经济职能。
典型的食品感官检验方法中定性分析包括()
少数人注射青霉素后出现胸闷、气急和呼吸困难等过敏(超敏)反应症状,严重者发生休克。以下有关叙述,正确的是:
2π
EveryoneknowshowtogettoCarnegieHall:practice,practice,practice.Butwhatabouthowtogetintothenation’smosthonor
继承是一种共享机制,指子类共享父类/超类的结构和方法。继承(包括多重继承和单重继承)使类的结构呈现(53)的结构关系。
WuhanlearnersofEnglishtendtopronounce"night"as"light".Thisshows______.
最新回复
(
0
)