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
Every 101 minutes or so, a Department of Defense imaging satellite circles the Earth, capturing images from the equator to the p
Every 101 minutes or so, a Department of Defense imaging satellite circles the Earth, capturing images from the equator to the p
admin
2017-01-15
20
问题
Every 101 minutes or so, a Department of Defense imaging satellite circles the Earth, capturing images from the equator to the polar ice caps. It’s that DOD drone(colorfully named the DMSPF-17)that monitors geologic changes, such as the decreasing size of the Arctic and Antarctic ice covers. The images it snaps are the ones most people see of the Earth’s two white domes, which have been steadily diminishing for the past decade.
Skimming over the top of the world feels a bit like being on a different planet, according to Rick Steiner, a marine conservation researcher at the University of Alaska. For the past two years, Steiner has led research missions flying low over thousands of miles of Arctic seas for a handful of polar climate scientists, some of whom work for the federal government. He times the daylong voyage to coincide with the time of year when sea ice is at a minimum, the exact end of summer melting in mid-September, before the autumn cool begins to refreeze some of the water. Having lived in Alaska for 30 years, Steiner can tell you in personal detail how the minimum has shrunk from year to year. He calls the voyage his annual "bearing witness to the Arctic crisis" trip.
The crisis has been mapped out in precise detail in slide shows and research papers, with startling statistics. The past three summers have seen the lowest ice volume ever recorded, according to data released annually by the National Snow and Ice Data Center(NSIDC). The sea-ice minimum in 2007(1.6 million square miles)was the single lowest year, with nearly 40 percent less ice than the seasonal average recorded over the past three decades. And the problem is only expected to worsen. As the ice melts, it releases highly concentrated carbon and methane(甲烷)that is locked in the permafrost(永冻层), creating an accelerating warming loop. An additional compounding factor is that dark oceans absorb more of the sun’s energy than light-colored ice, which reflects a large portion of it. That means that the more ice melts over the summer, the more open ocean there is, which leads to more absorbed energy and warmer oceans, which means that less ice forms the following winter, which leads to even more open ocean the following year. Early this past summer, researchers thought 2009 would be even worse than 2007 in terms of melting, until a late-arriving wind from the equator brought cool air that prevented even more melting.
"When you’re actually looking out the window and seeing mile after mile of warm ocean water where there used to be sea ice that you once walked around on, it gives you the certainty that something major is going on there, " says James Overland, a marine environmental researcher with the National Oceanic and Atmospheric Administration. The thickness of the ice and water temperatures—which were also measured at disturbingly high levels by Steiner and his team this year—are also measurements you can’t make by peering at satellite images.
According to the passage, ice-melting doesn’t lead to______.
选项
A、highly concentrated carbon and methane
B、an accelerating warming loop
C、more sun’s energy absorbed by dark oceans
D、more open ocean
答案
A
解析
细节题。第三段第五句提到,冰层融化释放了常年冻结带中高度聚集的碳和甲烷,从而导致气温加速循环上升。可知,[A]“高度聚集的碳和甲烷”不是冰层融化的结果,所以[A]为本题答案。其他三项都是冰层融化的结果,故均排除。
转载请注明原文地址:https://kaotiyun.com/show/wAJK777K
0
专业英语四级
相关试题推荐
Itisoftensaidthatpolitenesscostsnothing.Infact,itseemsthatalittlemorecourtesycould【C1】______businesses£5bil
Thelistofcandidatesforgreatestmenofthe20thcenturyisasshortasitisextraordinary.FranklinRooseveltistheob
Warning:Holdingacellphoneagainstyourearorstoringitinyourpocketmaybehazardoustoyourhealth.Thisparaphrase
Warning:Holdingacellphoneagainstyourearorstoringitinyourpocketmaybehazardoustoyourhealth.Thisparaphrase
Warning:Holdingacellphoneagainstyourearorstoringitinyourpocketmaybehazardoustoyourhealth.Thisparaphrase
Theteacher______expectshisstudentstopasstheuniversityentranceexamination.
InhisplaysShakespeare______hischaracterslivethroughtheirlanguage.
Ininternationalmatches,prestigeissoimportantthattheonlythingthatmattersistoavoid______.
Whichofthefollowingitalicizedphrasesindicatespurpose?
Ablindbabyisdoublyhandicapped.Notonlyisitunabletosee,butbecauseitcannotreceivethevisualstimulusfromitsenv
随机试题
A.去毛B.去芦C.去核D.去油E.去壳牛膝修治时,应
面神经不含有以下哪种神经纤维
A、广藿香B、荆芥C、薄荷D、益母草E、穿心莲主要含挥发油,油中主要成分为L-薄荷脑的药材是()
属于膨胀性泻药的是
营养性巨幼红细胞性贫血的护理措施是:
双向交通隧道内的风速不应大于()。
()是物权中最完整、最充分的权利。
共同海损指在同一海上航程中,当船舶货物和其他财产遭遇共同危险时,为了共同安全,有意地、合理地采取措施所直接造成的特殊牺牲、支付的特殊费用,由各受益方按比例分摊的法律制度。下列不属于共同海损的是:
下列选项中,不属于建筑物区分所有权特征的是()。
A、InviteprofessorGreentoherwedding.B、DeclinethepresentProfessorGreen’sremarksabouther.C、BuyProfessorGreenanice
最新回复
(
0
)