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
Soot(煤烟灰)and Snow: a Hot Combination New research from NASA scientists suggests emissions of black soot after the way sunlig
Soot(煤烟灰)and Snow: a Hot Combination New research from NASA scientists suggests emissions of black soot after the way sunlig
admin
2015-08-05
132
问题
Soot(煤烟灰)and Snow: a Hot Combination
New research from NASA scientists suggests emissions of black soot after the way sunlight reflects off snow. According to a computer simulation, black soot may be responsible for 25 percent of observed global warming over the past century.
Soot in the higher latitudes(维度)of the Earth, where ice is more common, absorbs more of the sun’s energy and warmth than an icy, white background. Dark-colored black carbon, or soot, absorbs sunlight, while lighter colored ice reflects sunlight.
Soot in areas with snow and ice may play an important role in climate change. Also, if snow and ice covered areas begin melting, the warming effect increase, as the soot becomes more concentrated on the snow surface. "This provides a positive feedback, as glaciers and ice sheets melt, they tend to get even dirtier. " said Dr. James Hansen, a researcher at NASA’s Goddard Institute for Space Studies, New York.
Hansen found soot’s effect on snow albedo(反照率), which may be contributing to trends toward early springs in the Northern Hemisphere, such as thinning Arctic sea ice and melting glaciers permafrost. Soot also is believed to play a role in changes in the atmosphere above the oceans and land.
" Black carbon reduces the amount of energy reflected by snow back into space, thus heating the snow surface more than if there were no black carbon, " Hansen said. Soot’s increased absorption of solar energy is especially effective in warming the world’s climate. "This forcing is unusually effective, causing twice as much global warming as a carbon-dioxide forcing of the same magnitude. " Hansen noted.
Hansen cautioned, although the role of soot in altering global climate is substantial, it does not alter the fact that greenhouse gases are the primary cause of climate warming during the past century. Such gases are expected to be the largest climate forcing for the rest of the century.
The researchers found that observed warming in the Northern Hemisphere was large in the winter and spring at middle and high latitudes. These observations were coherent with the researchers’ climate model situations, which showed some of the largest warming effects occurred when there were heavy snow cover and sufficient sunlight.
"This forcing" in Paragraph 5 refers to______.
选项
A、sun’s heating on snow surface
B、soot’s increased absorption of solar energy
C、carbon-dioxide’s warming effect
D、snow’s increased reflection of sunlight
答案
B
解析
第五段中的“This forcing”指的是其前面所说的“Soot’s increased absorption of solarenergy”。因此本题选B。
转载请注明原文地址:https://kaotiyun.com/show/zxQd777K
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
LoweringtheRiskofHeartDiseaseLikemillionsofotherAmericans,Icomefromafamilywithahistoryofheartdisease.My
LoweringtheRiskofHeartDiseaseLikemillionsofotherAmericans,Icomefromafamilywithahistoryofheartdisease.My
From1994to1998thenumberofAmericanswhohaddonatedakidneyreached244.Peoplewithheartdisease,diabetesandhighbl
Peoplearoundtheglobehittheheightoftheirmiseryanddepressionin(51)age,anewinternationalstudysuggests.The
Peoplearoundtheglobehittheheightoftheirmiseryanddepressionin(51)age,anewinternationalstudysuggests.The
FlyingintoHistoryWhenyouturnonthetelevisionorreadamagazine,celebrities(名人)areeverywhere.Althoughfameandt
FlyingintoHistoryWhenyouturnonthetelevisionorreadamagazine,celebrities(名人)areeverywhere.Althoughfameandt
UVLightCausesSkinCancerDon’tlaughifyouhearaboutkidshidingintheirbasementthissummer.Theymighthavebeenfr
WhathappenedtoPetelastFourthofJuly?FireworkseyeinjuriescanresultineachofthefollowingEXCEPT______.
Inthebeginningofparagraphonewearetoldthatscientistscannotagree______.Whatdoes"some"inthesecondsentenceofp
随机试题
下列哪点不符合利福平的情况:
胆小管的管壁由单层立方上皮组成。()
下列均为新生儿甲状腺功能减低症的临床表现,除了
在2003年8月前,评价过的885种因素中有88种已证实为人类肯定致癌因素。例如已有充分的调查显示慢性镉中毒能引起肾癌,所以镉被列为第1类致癌物。在第1类致癌物中芥子气属于
根据《安全生产法》的有关规定,( )以上地方各级人民政府负责安全生产监督管理的部门,应当定期统计分析本行政区域内发生生产安全事故的情况,并定期向社会公布。
关于房地产投资信托基金,以下说法错误的是()。
你对“道高一尺,魔高一丈”有什么看法?
感受域是指人对于各种刺激所能感受的范围,亦即在感觉系统中能够引起某一神经细胞或神经纤维反映的受刺激区域。根据上述定义,下列各项不涉及感受域的是()。
她喜欢淘衣服,多得塞满了衣橱、床头乃至床底储物柜,不舍得丢掉。但衣服实在太多了,有些根本没有机会再穿,她把它们分类拍照挂在自己的淘宝店上,期待有人问津,可又担心被人买走,总是忐忑中夹杂着庆幸。这段文字中的“忐忑中夹杂着庆幸”,可以替换为:
如果删除一个非零无符号二进制整数后的一个0,则此数的值为原数的
最新回复
(
0
)