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
Most scientists blame people, at least in part, for global warming. Now, some researchers say people may be partly to blame for
Most scientists blame people, at least in part, for global warming. Now, some researchers say people may be partly to blame for
admin
2010-01-07
44
问题
Most scientists blame people, at least in part, for global warming. Now, some researchers say people may be partly to blame for the cooling of Antarctica as well.
While average global temperatures have risen about one degree Fahrenheit over the past century, Antarctica over all appears to have cooled slightly in the past few decades. That has been puzzling, because the polar regions are thought to be more sensitive to warming trends than the rest of the globe. Even more puzzling, a small portion of Antarctica--the peninsula that stretches north toward South America--defies the cooling trend. It has been warming very rapidly, about five degrees over the past 50 years, 10 times the global average.
Writing in today’ s issue of the journal Science, Dr. David Thompson, a professor of atmospheric science at Colorado State University, and Dr. Susan Solomon, a senior scientist at the National Oceanic and Atmospheric Administration in Boulder, Colo., argue that the ozone hole, which has opened up each spring over Antarctica in recent years, may help explain both contradictory trends.
A vortex of winds continually blows around Antarctica, tending to trap cold air at the South Pole. In the new paper, Dr. Thompson and Dr. Solomon show that the winds have strengthened in the past few decades, keeping the cold air even more confined. The peninsula, which lies outside the wind vortex, escapes the cooling effect, the scientists said. They say the ozone hole may be the cause of the stronger winds.
Close to the ground, ozone, a molecule consisting of three oxygen atoms, forms a large and unhealthy component of smog. High in the atmosphere, however, nature occurring ozone is essential for life, blocking ultraviolet rays that would fatally mangle DNA. However, fewer ozone molecules mean the atmosphere absorbs less ultraviolet radiation. Instead of warming the air, the rays bounce off the snow and ice of Antarctica and reflect back into space.
Scientists already knew that the ozone hole had cooled the upper atmosphere. Dr. Thompson and Dr. Solomon show that the troposphere, the lowest six miles of the atmosphere, has also cooled. "It’ s a lot of food for thought in there," said Dr. John Walsh, a professor of atmospheric science at the University of Illinois and an author of a paper in Science in January that indicated Antarctica was cooling. He noted that the ozone hole was usually largest in November or December, but that the greatest cooling had been about six months later.
We can infer that in Antarctica the coldest period is ______ .
选项
A、spring
B、winter
C、November or December
D、May or June
答案
D
解析
见文章结尾。
转载请注明原文地址:https://jikaoti.com/ti/GwBsFFFM
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Besidesthefunctionsasavitalentertainmentmedium,whatelsecanpeopleuseaTVas?
Besidesthefunctionsasavitalentertainmentmedium,whatelsecanpeopleuseaTVas?
Besidesthefunctionsasavitalentertainmentmedium,whatelsecanpeopleuseaTVas?
Besidesthefunctionsasavitalentertainmentmedium,whatelsecanpeopleuseaTVas?
Doyouagreeordisagreewiththefollowingstatement?Television,newspaper,magazines,andothermediapaytoomuchattention
Forachild,happinesshasamagicalnature.Iremembermakinghide-outsinnewly-cuthay,playingcopsandrobbersinthewoods
Evolutionarytheories.TheBelgianGeorgeLemaitreproposedtheideathatabout20,000millionyearsagoallthematterinthe
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
Evolutionarytheories,TheBelgianGeorgeLemaitreproposedtheideathatabout20,000millionyearsagoallthematterinthe
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,thepriceofcrudeoil
随机试题
中国近代最早用资产阶级史学观点和方法来研究中国历史的人是()
汇集宋代以前儿科学术成就,成为当时世界上内容最完备的儿科专著是
根据商业银行的业务特征及诱发风险的原因,巴塞尔委员会将商业银行面临的风险划分为()等类别。
对于旅游团在饭店以外的餐馆用餐,地陪应事先核实地接社计调部门联系的()和特殊要求。
教学活动就其本质而言,是一种()
根据下列资料,回答下列小题:2014年1季度第二产业增加值同比提高金额最大的为()。
【《关税与贸易总协定》】华东师范大学2002年世界当代史真题
在窗体中添加一个命令按钮,名称为Command1,两个文本框名称分别为Text1、Text2,然后编写如下程序:PrivateSubCommand1_Click()a=Text1.Textb=Text2.
Beesareinsects,whichyoucanfindallovertheworld.Allbeescanfetchnectarfromtheflowers.
PASSAGETHREEWhatdidRechtschaffenwanttofindoutinhisresearchinthe1980s?
最新回复
(
0
)