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
59
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."
What did the new study by Eric Rignot and colleagues find about Greenland and Antarctica?
选项
A、Melting ice sheets have become the main reason of sea level rise.
B、The sea level could rise by 18-59 cm by 2100.
C、The rate of losing ice is accelerating.
D、There are two independent ways of losing ice.
答案
C
解析
事实细节题。第一段开头就介绍了这一新研究发现格陵兰岛和南极洲的冰川的融化速度越来越快,因此答案为C)。
转载请注明原文地址:https://kaotiyun.com/show/KL27777K
0
大学英语六级
相关试题推荐
ShouldYouJumpontheTechnologicalBandwagon(时尚)?TechnologicalAdvancesandTheirInfluenceWithinthelast20years
Exceptionalchildrenaredifferentinsomesignificantwayfromothersofthesameage.Forthesechildrentodeveloptheirfull
Methodsofstudyingvary;whatworks【C1】______forsomestudentsdoesn’tworkatallforothers.Theonlythingyoucandoisex
A、Almostonemillion.B、About600thousand.C、Nearly400thousand.’D、Approximately200thousand.B综合推断题。文章提到每年被偷的车有100万辆,其中40%
TheNationalAssociationofSecuritiesDealersisinvestigatingwhethersomebrokeragehousesareinappropriatelypushingindivi
A、Summer-vacationinternshipprograms.B、Employmentopportunitiesprovidedbyschools.C、Potentialrisksofworkingpart-time.D
A、Thewholecitybecomesnoisy.B、It’shardtofindacheaporvacanthotelroom.C、Itistoohotthen.D、Thecrimerateincreas
Whatisnottheresultofglobalization?Whatdoes"...buthasmadeavastnumberofover-35-year-oldsredundant"(Line2,Par
A、Byvisitingpotentialcustomers’websitesconstantly.B、Bypostingmessagesonpotentialcustomers’Facebookwall.C、Byrespon
A、Shemaychangehermindaboutthecollege.B、Hedoesn’tknowwhattimeshearrived.C、Hewisheshehadmetheryesterday.D、Sh
随机试题
A.输血管理信息系统的安全性B.输血管理信息系统的高效性C.输血管理信息系统的实用性D.输血管理信息系统的标准化E.输血管理信息系统的先进性采供血的管理和业务工作服务必须能够满足各部门多种情况的需要,既要满足现在工作的需要,又要满足以后发展的需
A.咖啡因B.长春碱C.喜树碱D.蛇根碱E.毒芹碱具有升华性的生物碱是()
药品的包装须按规定印有或贴有
关于地方政府机构设置和编制管理,下列哪一说法是正确的?
某逻辑电路如图7—62所示,若输入A=1,B=0,则输出F1和F2分别为()。
依据《环境影响评价公众参与暂行办法》的规定,为了加强公众参与环境影响评价活动,在环境影响评价报告书中,应当()。
当出现经济萧条时,政府可采用()的财政政策。
履约担保是指发包人在招标文件中规定的要求承包人提交的保证履行合同义务的担保。它的形式一般不包括()。
女子甲因不满月嫂乙的表现,在网站上发了一篇题为《说说我家黑心月嫂》的帖子,不仅公布了乙的真实姓名和电话,还列举了五大“罪状”,其中包括给孩子吃安眠药、护理技术差、偷钱、偷吃东西、挑拨家里人关系等。乙将甲告上法庭。乙能证明是甲发帖和帖子内容。但不能证明在甲家
天气很热,他要坚持体育锻炼。
最新回复
(
0
)