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
70
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
A、Ahousewife.B、Asinger.C、Ateacher.D、Amusician.DWhatwasMidori’smother?信息明示题。由文章第一段可知,她的母亲是个音乐家,所以D正确。
EversinceALGoreinventedit,theInternethasbeenaparadiseforthosewithacreativeattitudetofacts.Students,forexam
AreWeTurningintoaNationofLoners?Marriageisdown,andsoischildbirth.Butdivorceisup,alongwithsingle-person
TheNationalAssociationofSecuritiesDealersisinvestigatingwhethersomebrokeragehousesareinappropriatelypushingindivi
A、Anypowerfulnationmaycontrolthesea.B、Anyareaoftheseabelongstothenationclosesttoit.C、Noonehasexclusiverig
Angerandotherstrongemotionscantriggerpotentiallydeadlyheartrhythmsincertainvulnerablepeople.Previousstudies
A、Taketheirownbagstothegrocerystore.B、Buythingsthatareoverpackaged.C、Donotbuyclothtowels.D、Donotthrowawayt
A、Thecherishedindividualism.B、Theroleofindividualsinsociety.C、Thelonerherofightingevilforces.D、Theidealsofinde
A、ChildreninCaliforniaarenotlikelytolearncreativegeography.B、ChildreninprivateschoolsrunbyJapanesearesmarter.
A、Thepersonnelmanagershouldbefiredforinefficiency.B、Afewengineersshouldbeemployedtomodernizethefactory.C、Thee
随机试题
低碳钢和低合金钢焊接时,焊接材料的选择原则是强度、塑性和冲击韧度都不能低于被焊钢材中的()值。
A.Kallmann综合征B.Asheman综合征C.Sheehan’ssyndromeD.TurnerssyndromeE.Klinefeltersyndrome
男性,27岁。查体:腹式呼吸减弱。该患者可能是以下疾病,除了
青春期龈炎的临床表现不包括
胸部肿块的X线平片检查方法是( )
不能用于液体制剂矫味剂的是()。
如图4—8所示,竖向荷载设计值F=24000kN,承台混凝土为C40(ft=1.71MPa),按《建筑桩基技术规范》验算柱边A—A至桩边连线形成的斜截面的抗剪承载力与剪切力之比(抗力/V)最接近下列哪个选项?()[2008年真题]
一个三口之家,爸爸比妈妈大3岁,现在他们一家人的年龄之和是80岁,10年前全家人的年龄之和是51岁,则女儿今年多少岁?()
捻军起义
FrenchDefenseMinisterMicheleAlliot-Mariesayshergovernmentis【B1】______tohelptrainIraq’spoliceandmilitarybutrules
最新回复
(
0
)