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
Even just a degree or two of greenhouse warming will have a dramatic impact on water resources across western North America. Tea
Even just a degree or two of greenhouse warming will have a dramatic impact on water resources across western North America. Tea
admin
2016-11-21
40
问题
Even just a degree or two of greenhouse warming will have a dramatic impact on water resources across western North America. Teams who have modeled the climate in the area are warning of greatly reduced snow packs and more intense flooding as temperatures inch up during the 21st century.
It’s the first time that global climate modelers have worked so closely with teams running detailed regional models of snowfall, rain and stream flows to predict exactly what warming will do to the area. The researchers, from the National Center for Atmospheric Research in Boulder, Colorado, and elsewhere, were surprised by the size of the effect generated by only a small rise in temperature.
Assuming business as usual emissions, greenhouse gases will warm the west coast of North America by just one or two degrees Celsius over the next century, and average precipitation won’t change much. But in the model, warmer winters raised the snowline, drastically reducing the crucial mountain snow pack, the researchers told the American Geophysical Union in San Francisco. "We realized that huge areas of the snow pack in the Sierra went down to 15 percent of today’s values," says Michael Dettinger, a research hydrologist at the Scripps Institution of Oceanography in La Jolla, California. That caught everyone’s attention.
The researchers also predict that by the middle of the century, melting snow will cause streams to reach their annual peak flow up to a month earlier. And with warm rains melting snow or drenching already saturated ground, the risk of extreme floods will rise dramatically. We have to believe in these very warm, very wet storms, says Andrew Wood, a water resources modeler at the University of Washington, Seattle.
"Since dams can’t be filled until the risk of flooding is past, the models predict they will trap just 70 to 85 percent as much run-off as they do now. This is a particular problem for California, where agriculture, industry, a burgeoning population and environmental needs already clash over limited water supplies. We are taking this extremely seriously," says Jonas Minton, deputy director of the California Department of Water Resources.
And observations certainly back up the models. Minton points out that an increasing percentage of California’s precipitation over recent decades is falling as rain rather than snow. And Iris Stewart, a climate researcher at the University of California, San Diego, has found that in the last 50 years, run-off peaks in the western US and Canada have been happening earlier and earlier. The cause seems to be a region-wide trend towards warmer winters and springs.
Dettinger has little doubt that the models point to a real and immediate problem. "It’s upon us," he says, "and it’s not clear what the fix is."
Researchers predict all of the following EXCEPT that______.
选项
A、a small rise in temperature will procure disaster
B、greenhouse gases will warm the west coast of North America by one or two degrees
C、melting snow will give rise to streams and make them reach their annual peak earlier
D、dams will trap just 70 to 85 percent as much run-off as they do now
答案
A
解析
事实细节题。B在第三段第一句提到。C在第四段第一句。D可在第五段第一句找到。A与第二段最后一句意思稍有差异。本句意思为,来自科罗拉多州博尔德市国家大气研究中心等组织的研究者们,对于只要温度小幅度升高就能造成的影响感到惊讶,并没有说温度升高一定导致灾难。
转载请注明原文地址:https://kaotiyun.com/show/XHJK777K
0
专业英语四级
相关试题推荐
MostpeopleknowtwothingsaboutCorsica;Napoleonwasbornhereanditwasthehauntofbandits.Thefirstiscorrect;thesec
ChildrenasyoungasfourwillstudyShakespeareinaprojectbeinglaunchedtodaybytheRoyalShakespeareCompany.TheRSC
ThemysteryoftheexpansionofseaicearoundAntarctica,atthesametimeasglobalwarmingismeltingswathsofArcticseaic
ThemysteryoftheexpansionofseaicearoundAntarctica,atthesametimeasglobalwarmingismeltingswathsofArcticseaic
Mygrandmothercutarecipesometimeinthe1940sor1950sfor"Mrs.Orr’sChocolateCake"fromtheMonitor.Whenmydadtasted
Shewouldhavebeenmoreagreeableifshehadchangedalittlebit,______?
Mostpeoplewhogoonlinehavemainlypositiveexperience.But,【C1】______anyendeavor—traveling,cooking,orattendingschool—t
Theconceptofpersonalchoiceinrelationtohealthbehaviorsisanimportantone.Anestimated90percentofallillnessmayb
Weshouldalwaysbearinmindthat______decisionsoftenresultinseriousconsequences.
Britainhasannouncedthatitistocancelabout200millionpounds’worthofdebts【D1】______itbypoorerCommonwealthcountrie
随机试题
A.利多卡因B.噻吗洛尔C.乙酰唑胺D.山莨菪碱E.去氧肾上腺素(苯肾上腺素、新福林)可扩大瞳孔,升高眼压的药物是
A.大承气汤B.青麟丸C.五仁丸D.补中益气汤E.增液承气汤血虚型便秘,若阴血已复,便仍干燥,可用何方润肠通便
小儿上呼吸道感染主要的病原体是()
A.虫蛀B.霉变C.沉淀D.挥发E.酸败合剂在贮藏中易()
听到病人带金属音的咳嗽时应警惕
属于工程项目质量管理特点的是()。
2014年,G淀粉公司雇佣临时人员把仓库改造成第三生产车间。该车间为长80m、宽50m、高15m的框架砖混结构建筑,分成打包间和产品暂存间。打包间用7m高砖墙与暂存间分隔。打包间内有打包机8台、振动筛8台。振动筛安装在6m高的二层钢制平台上,振动
服务技能可以分为()。
依照刑法的规定,行贿罪的构成在主观方面必须是()。
下列关于光以太网技术特征的描述中,错误的是
最新回复
(
0
)