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
71
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.
The author refers to the Venus primarily in order to ______.
选项
A、show the inherent weakness of the greenhouse effect theory
B、show that the greenhouse effect works on other planets but not on the Earth
C、show the extent to which Earth’s atmosphere differs from that of the Venus
D、support the argument that the CO2 level in the atmosphere has a significant effect on climate
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/oE1O777K
0
考博英语
相关试题推荐
Thinkaboutwhatwouldmakeyoureally,reallyhappy.Moremoney?Wrong.Smiling,well-adjustedkids?Wrongagain.Thefactisw
Hutuextremistsingovernmentorganizedthekillingandusedstateradiostationstourgeordinarypeopletocrushthecockroach
Walkingthroughmytrainyesterday,staggeringfrommyseattothebuffetandback,IcountedfivepeoplereadingHarryPottern
Desperation,hunger,thirst,andresentmentallmakeitmorelikelythatpeoplewill______amorepowerfulfigurewhopromisesth
Inamaterialisticand______societypeople’sinterestseemstobefocusedsolelyonmonetarypursuit.
Sincethedawnofhumaningenuity,peoplehavedevisedevermorecunningtoolstocopewithworkthatisdangerous,boring,burd
Thestatementwasanallusiontorecenttroubleswiththeagency’scomputers.
Japaneseworkersstillputinanimpressive42hourseachweekbuttheyare________bytheSouthKoreansandSingaporeanswhospe
Thechairmanoftheboard_____onmetheunpleasantjobofdismissinggoodworkersthefirmcannolongeraffordtoemploy.
随机试题
管子在弯曲时会产生什么样的变形?和哪些因素有关?
“香市”中主要的节目无非是“吃”和“玩”。临时的茶棚,戏法场,弄缸弄甏、走绳索、三上吊的武技班,老虎,矮子,提线戏,髦儿戏,西洋镜,——将社庙前五六十亩地的大广场挤得满满的。庙里的主人公是百草梨膏糖,花纸,各式各样泥的纸的金属的玩具,烂如繁星的“烛山”,熏
A.伸直型肱骨髁上骨折B.股骨下1/3骨折C.肘关节脱位D.腓骨小头骨折E.髋关节脱位手法复位后股骨头缺血性坏死可发生于
下列哪项不是酶的特性
折现率是投资决策中的重要因素,如果其他因素不变,折现率提高时,下列指标中的数值会变小的是()。
()是系统理论。
设ξ为随机变量,从棱长为1的正方体的12条棱中任取两条,当两条棱相交时,ξ=0;当两条棱平行时,ξ的值为两条棱之间的距离;当两条棱异面时,ξ=1.(1)求概率P(ξ=0);(2)求ξ的分布列,并求其数学期望E(ξ).
参政议政
设有如下声明语句OptionBase1Dimarr(2,一1To5)AsInteger则数组arr中数组元素的个数是()。
Onetheoryabouttheuniversesaysthatithasnoboundary,noedge.ThistheorywasproposedbyStephenHawkingandJimHartle.
最新回复
(
0
)