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
考研
For more than a decade, scientists have been trying to determine whether climate change is linked to intense storms, such as 200
For more than a decade, scientists have been trying to determine whether climate change is linked to intense storms, such as 200
admin
2012-06-02
32
问题
For more than a decade, scientists have been trying to determine whether climate change is linked to intense storms, such as 2005’s Hurricane Katrina. Meteorologist Michael Mann of Pennsylvania State University, and colleagues attacked the question by turning to the past. They looked through drill cores from coastal waters for signs that sediments had been disturbed by major storms. Eight sites along the U. S. East Coast and Puerto Rico provided a reliable record of the number of significant hurricanes going back about 1500 years. Other climate data and models added clues to water temperatures and hurricane intensity.
As the researchers report tomorrow in Nature, they found strong evidence that Atlantic hurricane activity peaked about 1000 years ago, producing up to 15 hurricanes a year on average — a level matched in recent times only over the past decade and a half. At the time, according to estimates constructed from other geologic data, Atlantic water temperatures were relatively warm, "though not as warm as today," Mann says. And Pacific temperatures were relatively cool, thanks to La Nina events. Warmer Atlantic waters whip up more storms, but warmer Pacific temperatures tend to create stronger jet streams that break up those storms. So the twin conditions a millennium ago produced kind of a "Perfect Storm" for hurricanes, he explains.
Of particular interest, the sediments reveal a close link between warmer water and the number of hurricanes during the past 150 years or so. Dropping temperatures produced seven or eight hurricanes a year, while a rising thermometer, such as in the earlier part of this decade, pushed the total to 15. "All other things being equal, " Mann says, "this suggests that we are indeed likely to see not only stronger hurricanes in the Atlantic but perhaps more of them" in the near future.
Meteorologist James Eisner of Florida State University in Tallahassee agrees with the findings, but adds a caveat. The historical data do show that a link between warmer ocean temperatures and higher hurricane frequencies has existed for at least 1500 years, he says. However, there’s a high degree of uncertainty in the data. That and the fact that the physics explaining the link haven’t yet been established, Eisner explains, "indicate this is not the ’ smoking gun’ we’ve been looking for that would allow us to confidently project what will happen as the oceans continue to warm. "
The most useful information Michael Mann could directly see from the drill cores should be
选项
A、how Hurricane Katrina had disturbed the sediments.
B、how often hurricanes occurred over the past 1500 years.
C、how many times hurricanes had occurred in the last 1500 years.
D、how water temperatures had changed in the last 1500 years.
答案
C
解析
事实细节题。由题干关键词将答案依据定位于第一段。第一段第四句说位于美国东海岸和波多黎各的8个观察点提供了一份1500年来大飓风发生次数的可靠记录。由下文的调查内容可知他们要找的就是在1500年间的发生次数与时间之间的关系,也就是发生的频率。频率不能直接看到,能看到的是发生次数,选项[C]符合题意,排除[B]。选项[A]“沉积物如何被卡特里娜飓风搅乱的”,不是该研究要找的最有用的信息。水温是通过其他数据和模型获得的,排除[D]。
转载请注明原文地址:https://jikaoti.com/ti/V20RFFFM
0
考研英语一
相关试题推荐
Inthefirstparagraph,theauthormentionsMcKendrickandPlumbmostprobablyinorderto_______.Inthethirdparagraph,the
Inthefollowingtext,somesentenceshavebeenremoved.ForQuestions41-45,choosethemostsuitableonefromthelist(A、B、C、
EuropeansandAmericansalikehavecertainromanticnotionsaboutSweden.Weimagineitasalandofliberal-mindedpeoplelivin
Roughly30mpeopleareinfectedwithHIV,thevirusthatcausesAIDS.Thevastmajorityliveinthepoorerpartsoftheplanet.
ThomasHuxley("’Darwin’sbulldog")issaidtohavecomeupwiththemostfamousdefenseoftheatheistbeliefthatlifewascre
ImmediatelyaftertheCivilWar,however,thedietbegantochange.(46)Railtransportationincreasedthesupplyandimproved,t
Recently,apossiblealternativewayofproducingpaperhasbeensuggestedbyagriculturalistsandenvironmentalists:aplantca
The20thcenturymayhavebeentheageofscientificadvancementbut,asthenewmillenniumbegins,(1)_____worldhealththepr
EuthanasiahasbeenatopicofcontroversyinEuropesinceatleast1936.@Onanaverageofsixtimesaday,adoctorinHolland
随机试题
称取0.7875g硝酸银,定容至500mL,此溶液中银的质量浓度是0.1mg/mL。(银的相对原子质量是108)()
王某在使用信用卡过程中,超过规定的限额进行投资,发卡银行再三催讨欠款.王某故意不予理会,经银行核实,王某完全没有偿还能力。王某的行为()。
以下微量元素中具有潜在毒性,但低剂量时可能具有人体必需功能的是()。
()能够引起测评结果的误差。(2008年5月二级真题)(2007年5月二级真题)
人面鱼纹彩陶盆最可能出现在下列哪个地方?()
桥下的清波昼夜不停地淌过,仿佛快丢失了时间。自从和友人在桥上聚过一次之后,我就依恋上了这桥。每日傍晚,比那粗茶淡饭更悠恬的便是这桥与流水。因此每日饭后,我便踱步来到这里。等着夕阳渐渐藏入大山之后,晚霞洒遍天际,造物者再将这凄冷的意象映入冰冷的水中,成全了追
某人编写了向随机文件中写一条记录的程序,代码如下:TypeRTypeNameAsString*10TelAsString*20EndTypePrivateSubCommand1_Click(
Thegreatestadvantageofbooksdoesnotalwayscomefromwhatwerememberofthem,butfromtheir【C1】______.Agoodbookoften【
(1)FredericChopinwasborninZelazowaWola,Poland,orFebruary22,1810,toaFrenchfatherandPolishmother.Hisfather,N
TheTop10CarsthatAmericansHateTimesaresodifficultfortheautoindustrythatevenToyotaandHondahavenowexperie
最新回复
(
0
)