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
Aided by the recent ability to analyze samples of air trapped in glaciers, scientists now have a clearer idea of the relationshi
Aided by the recent ability to analyze samples of air trapped in glaciers, scientists now have a clearer idea of the relationshi
admin
2020-12-14
57
问题
Aided by the recent ability to analyze samples of air trapped in glaciers, scientists now have a clearer idea of the relationship between atmospheric composition and global temperature changing over the past 160,000 years. In particular, determination of atmospheric composition during periods of glacial expansion and retreat(cooling and warming)is possible using data from the 2,000 meter Vostok ice core drilled in Antarctica. The technique involved is similar to that used in analyzing cores of marine sediments, where the ratio of the two common isotopes of oxygen, 180 and 160, accurately reflects past temperature changes. Isotopic analysis of oxygen in the Vostok core suggests mean global temperature fluctuations of up to 10 degrees centigrade over the past 160,000 years.
Data from the Vostok core also indicate that the amount of carbon dioxide has fluctuated with temperature over the same period: the higher the temperature, the higher the concentration of carbon dioxide and the lower the temperature, the lower the concentration. Although change in carbon dioxide content closely follows change in temperature during periods of deglaciation, it apparently lags behind temperature during periods of cooling. The correlation of carbon dioxide with temperature, of course, does not establish whether changes in atmospheric composition causing the warming and cooling trends or were caused by them.
The correlation between carbon dioxide and temperature throughout the Vostok record is consistent and predictable. The absolute temperature changes, however, are from 5 to 14 times greater than would be expected on the basis of carbon dioxide’s own ability to absorb infrared radiation, or radiant heat. This reaction suggests that, quite aside from changes in heat-trapping gases, commonly known as greenhouse gases,
certain positive feedbacks
are also amplifying the temperature change. Such feedbacks might involve ice on land and sea, clouds, or water vapor, which also absorb radiant heat.
Other data from the Vostok core show that methane gas also correlates closely with temperature and carbon dioxide. The methane concentration nearly doubled, for example, between the peak of the penultimate glacial period and the following interglacial period. Within the present interglacial period it has more than doubled in just the past 300 years and is rising rapidly. Although the concentration of atmospheric methane is more than two orders of magnitude lower than that of carbon dioxide, it cannot be ignored: the radiative properties of methane make it 20 times more effective, molecule for molecule, than carbon dioxide in absorbing radiant heat. On the basis of a simulation model that climatological researchers have developed, methane appears to have been about 25 percent as important as carbon dioxide in the warming that took place during the most recent glacial retreat 8,000 to 10,000 years ago.
The passage suggests that when the methane concentration in the Earth’s atmosphere decreases, which of the following also happens?
选项
A、Glaciers melt faster.
B、The concentration of carbon dioxide increases.
C、Carbon dioxide absorbs more radiant beat.
D、The global temperature decreases.
答案
D
解析
推断题。根据文章最后一段的最后一个例子“从气候学研究者所建立的某个模拟模型来看,在8 000至10 000年之前的最近一次冰川稍退期间发生的升温过程中,甲烷似乎发挥了相等于二氧化碳25%的重要作用。”可知温度升高,甲烷含量升高,二者关系是正相关。那么如果甲烷含量下降,温度应该会降低.所以答案选D。
转载请注明原文地址:https://kaotiyun.com/show/48P7777K
0
大学英语六级
相关试题推荐
RichChildrenandPoorOnesAreRaisedVeryDifferently[A]ThelivesofchildrenfromrichandpoorAmericanfamilieslookmore
RichChildrenandPoorOnesAreRaisedVeryDifferently[A]ThelivesofchildrenfromrichandpoorAmericanfamilieslookmore
A、Transferringmoneythroughbankonline.B、Purchasingthecleaningproductsonline.C、Buyingmeatfromthecornershop.D、Going
A、Failureinreadingmedicinedirections.B、Incapabilityoftakingcareofchildren.C、Brokenfamilyrelationship.D、Reluctance
A、Ignoringeverydayfastchanges.B、Learninglessonsfromworkinghard.C、Usingtheadvancedtechnologies.D、Makingothersmore
Peopleatthelowerendoftheincomescaletakemorepleasureintheirrelationshipsandenjoycaringforandconnectingwitho
A、Muscleschangemost.B、Fatpeoplechangeobviously.C、Thewell-earnedfitnesspositionislost.D、Peoplegetsickmoreeasily.
A、Theinternshipprogramdoesnotofferstudentsout-of-classroomexperiences.B、Thecooperativeeducationprogramprovideslong
随机试题
用酸溶解金属铝时,铝块越纯溶解速率越慢。 ()
脑膜瘤多发源于
糖尿病患者代谢异常的临床表现不包括
实验室为其应用而制定检测和校准方法的过程应是有计划的活动,并指定()人员进行。
甲市某电台为在乙市从事拍摄工作而设市了临时机构,并在乙市某银行开立了银行账户,则该银行账户属于()。
某酒厂为增值税一般纳税人,主要生产粮食白酒和啤酒。2004年1月“主营业务收入”账户反映销售粮食白酒50000斤,取得不含税销售额105000元;销售啤酒150吨,每吨不含税售价2900元。在“其他业务收入”账户反映收取粮食白酒品牌使用费4680元,销售啤
下列各项中,会导致企业采取高股利政策的事项是()。
殿试按成绩分为“三甲”,一甲:取三名,叫“赐进士及第”。第一名俗称(),第二名俗称(),第三名俗称()。
根据所给资料,回答下列小题。2011年8月,上海市接待日本游客数是新加坡游客数的()倍。
在表单数据环境中,将环境中所包含的表字段拖到表单中,根据字段类型的不同将产生相应的表单控件,下列各项中,对应正确的一项是()。
最新回复
(
0
)