首页
登录
职称英语
Every 101 minutes or so, a Department of Defense imaging satellite circles t
Every 101 minutes or so, a Department of Defense imaging satellite circles t
游客
2023-11-03
41
管理
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. [br] 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:http://tihaiku.com/zcyy/3155433.html
相关试题推荐
JusticeDepartment’sdecisiontofireitseightemployeeshas______.[br][orig
Turfwarsare______whentwodepartmentsaremerged.A、apparentB、inevitableC、con
Every101minutesorso,aDepartmentofDefenseimagingsatellitecirclest
Every101minutesorso,aDepartmentofDefenseimagingsatellitecirclest
We’realwaysbeingtoldbytheDepartmentofHealthtoeatfiveportionsof
We’realwaysbeingtoldbytheDepartmentofHealthtoeatfiveportionsof
Thisprojectwould______ahugeincreaseindefensespending.A、resultB、assureC、
Itwilltakeustwentyminutestogettotherailwaystation,______trafficdela
Manypeoplearemakingpromiseseveryday.Administrationdepartmentspromis
Whycan’tDoncalltheprofessorhimself?[br][originaltext]M:MathDepartment
随机试题
WALTERSCORPORATION3255TrentonAvenue,Co
Fromchildhoodtooldage,wealluselanguageasameansofbroadeningou
关于责任保险的说法,正确的是()。A.责任保险承保一切法律责任 B.责任保
封闭楼梯间是指设有能阻挡烟气的双向弹簧门或()级防火门的楼梯间。A.甲
某社区卫生服务站2018年开始责任医生进家庭试点工作,并为社区居民建立健康档案,
健康管理服务的特点包括A.整体化 B.标准化 C.系统化 D.个性化 E
胃癌最常见的发生部位A.胃底部 B.胃小弯 C.胃窦部 D.胃体部 E.
某市急救中心收治了一名需要急救但身份不明的重病患者,根据《社会救助暂行办法》,该
下列选项中,不属于成长型基金与收入型投资基金差异的是()。A.投资目的不同
患者男性,35岁,半小时前被刀刺伤左臂,来院急诊,见左前臂伸侧约有4cm长创伤,
最新回复
(
0
)