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
Greenland and Antarctica are losing ice at a faster and faster rate, according to a new study that has tracked the rate of melti
Greenland and Antarctica are losing ice at a faster and faster rate, according to a new study that has tracked the rate of melti
admin
2013-10-08
96
问题
Greenland and Antarctica are losing ice at a faster and faster rate, according to a new study that has tracked the rate of melting in two independent ways. At this rate, melting ice sheets could dominate sea level rise in the 21st century.
The most recent report by the Intergovernmental Panel on Climate Change suggested that sea levels could rise by 18 cm to 59 cm by 2100—but that estimate didn’t take the Greenland and Antarctic ice sheets into account.
The new study, by Eric Rignot of the University of California, Irvine, and colleagues, could make things clearer. The team studied changes in the two ice sheets between 2002 and 2010 using two techniques. First they used data from the NASA GRACE satellite, which directly estimates the changes in the ice mass by measuring Earth’s gravity field over Greenland and Antarctica. The gravity field is influenced by changes in ice mass.
Next, they used a mass balance approach, which involves taking monthly measurements of glacier movement and ice thickness and plugging them into a regional climate model to estimate the net accumulation of snow and ice.
Both techniques broadly agreed on the quantity of ice being lost. They both confirmed, for example, that in 2006 the ice sheets of Greenland and Antarctica together lost a total of 475 gigatonnes. The two data sets also agree that the rate of mass loss from the ice sheets is increasing at about 36 gigatonnes per year—three times faster than the rate of mass loss from mountain glaciers and ice caps.
Because the two data sets agree both methods are validated. Measurements were taken using the mass balance approach for several years before the launch of GRACE in 2002, and indicate that melting has been on the increase for at least two decades.
"The mass loss is accelerating and it appears to have been accelerating for a while," says Isabella Velicogna of University of California at Irvine, a member of the research team.
If the ice sheets continue to melt faster and faster, sea levels could rise 56 cm by 2100, "which is much bigger than what we were thinking three years ago", says Velicogna. As such, ice sheets would become the dominant contributor to sea level rise this century.
While the study cannot separate out the effects of climate change from natural variability, the trend is worrying. "It fits into a pattern that we’d expect of ice sheet response to climate change," says glaciologist Ian Howat of the Ohio State University in Columbus. "Whatever processes are driving the mass loss are intensifying. The picture is getting worse, not better."
The two methods used by researchers are proved to be valid by the fact that______.
选项
A、they generally agreed on the quantity of lost ice
B、the two data sets agree with each other
C、both of them confirm the accelerating rate of ice losing
D、both of them show that melting has been on the increase for a while
答案
B
解析
细节辨认题。第六段提到,因为两组数据集一致,所以这两种方法都得到了证实,因此答案为B)。
转载请注明原文地址:https://kaotiyun.com/show/pL27777K
0
大学英语六级
相关试题推荐
A、Beingoutdoors.B、Thebadweather.C、Thedangerofdrivingatnight.D、Dealingwithdifferentpeople.C对话中男士问女士工作中有没有unpleasan
Theplanforslumclearance__________________(因缺少经费而不得不暂时搁置),butitishopedthenewgovernmentwill__________________(恢复必需的经
Dr.GregoryConnollyisdirectoroftheofficefornonsmokingandhealthintheMassachusettspublichealthdepartment.Hesaid
A、Thedesignofthestoryline.B、Thedescriptionofpeople’scharacters.C、Thethoughthewantstoexplain.D、Thedescriptionof
Ahappymarriageapparentlyisgoodmedicine,buthostilespousesmaybeharmfultooneanother’shealth.Couplesin【B1】______
A、Theyaresupposedtowriteanessayof1,000words.B、Theyareaskedtodothepresentationseparately.C、Eachofthemneedst
A、TheBestofJazz.B、ChristmasCarols.C、ClassicalMusic.D、RockMusicCollection.CThewoman’sbrother喜欢古典音乐,自然选C。A项爵士音乐精选,B项圣
WheneverIhearaweatherreportdeclaringit’sthehottestJune10onrecordorwhatever,Ican’ttakeittooseriously,becaus
TheTraditionalCulture1.社会高速发展,中国传统文化日益被忽视。2.中国传统文化不会消失。3.你的看法。
A、Themanwasn’tathomeyesterdayevening.B、Theman’sgrandmotherdidn’twanthimtogoout.C、Thewomandidn’twanttomeett
随机试题
下列关于妊娠合并急性阑尾炎描述错误的是
卵巢囊肿最常见的并发症是()
骨折引起脂肪栓塞是由于
自然保护区的内部未分区的,依照《中华人民共和国自然保护区条例》有关()的规定管理。
设备的装配,可分为()。
X企业出租一台设备给Y企业,租期3个月,收取押金2000元,存入银行,则( )。
项目处在一个不断发展变化的环境之中,因此,项目本身也难免发生各种各样的变化,于是项目团队需要对项目进行各种修改,这些变化和修改就是变更。变更发生在项目的范围、进度、质量、费用、风险、人力资源、沟通以及合同等各个方面,并会对其他方面产生一定的影响。其中范围变
那时候,老是慎重其事地把左掌右掌看了又看,或者,从一条曲曲折折的感情线,估计着感情的河道是否_______。有时,又正经地把一张脸交给一个人,从鼻山眼水中,去_______一生的风光。填入画横线部分最恰当的一项是()。
日常生活中,有些人在服药时为图省事,将药片放在口中后,不喝水或仅喝一口水,再用力一咽,就算是服完药了。有些人认为,这种服药方式是不可取的。以下哪项如果为真,最能支持这些人的观点?()
静态随机存储器中,当片选线无效时,则三态数据缓冲器的状态为( )
最新回复
(
0
)