Unit 3El Nino.docx
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Unit 3El Nino.docx
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Unit3ElNino
Unit3ElNino?
LaNina?
PartI
D.warmer/greenhouseeffect/sealevels/climatezones
As1998endsandpeoplelookforwardtothelastyearofthecentury,theWorldAlmanacspokewithexpertsaboutwhatcomesnext.Almanaceditorialdirectorsaystheexpertsbelievethenextcenturywillbringlotsofchanges.
Warm,ofcourse,thatourclimateisgoingtocontinuegettingwarmer.That’sthesubject,bytheway,ofanothernewarticleonthe1999WorldAlmanac.Thegreenhouseeffect,exactlywhatcausesit,andwhatstepstobetakento,perhapstoalleviateglobalwarmings.I’veseenrecentlythat1998isgoingtogodownasthewarmestyeareveronrecord.Andsothat’sgoingtobeamajorissueofthenextcentury,andpossibletremendousconsequencesoftheglobalwarmings,whetheritisrisingsealevelsaffectingthcoastalareas;changesinclimatezonesaffectingwhatcropscanbegrown,andinwhatregions.Thisispotentiallyaverysignificanttrendtobewatched.
E.Cyclone:
Northorsouthofequator/Typhoon:
/Hurricane:
EasternPacific
Majoroceanstormsinthenorthernpartoftheworldusuallydevelopinlatesummerorautumnoverwatersneartheequator.Theyareknownbyseveraldifferentnames.ScientistscallthesestormscycloneswhentheyhappenjustnorthorsouthoftheequatorintheIndianOcean.InthewesternPacificOceanortheChinaSea,thesestormsarecalledtyphoons.IntheeasternPacificandAtlanticOcean,theyarecalledhurricanes.
PartII
A.Outline1.A.weatherpattern/globalclimate
B.1.twiceadecade2.12-18monthsC.1.warmerweather/2.wetterthanusual/drierD.thedeclineofwindsII.1.droughts
B.acyclicweatherpattern/abouttwiceadecade/wetter/drier/coldwaterawayfromSouthAmerica’swest/toexpandeastwardtowardtheAmerica’s/moveeastwardtoo/theweather
arondtheworld/droughts/rainsandflooding/ontheSouthAmericanfishingindustry/to
becomedepletive/thestrengthofit/
SatellitereadingsconfirmthatconditionsarerightforanotherElNino,acyclicweather
patternthataffectstheglobalclimate.
ElNino’snormallyshowupabouttwiceadecadeanditlastsabout12to18months,
bringingwarmerweathertopartsoftheearth.Someregionsbecomewetterthanusual,
othersdrier.TheElNino,whichbeganin1991haslingeredthroughthisyear.Although
severalyearsmighthavebeenexpectedtopassbeforethenextone,anAmerican-French
satelliteobservingtheoceanshasfoundasignthatElNinomaycomebackquickerthan
expected.
Thesekindsofthingsstillhappen.ThisisBrigJacker,anoceanographeroftheUSNaval
ResearchLaboratoryinMississippi.
Everyyearisunpredictable.OneyearmightbeElNinoyear,oneyearmightnot.Generally
ElNino’scomeinfouryearcycles.Butthere’snothingtosaythatyoucan’thavetwo
ElNinoyearsinarow.
ElNino’sbeginwiththedeclineofwindspullingcoldwaterawayfromSouthAmerica’s
westcoasttoaroundtheequator.ThisallowswarmwaterinthewesternPacificOceanto
expandeastwardtowardtheAmerica’s.Atthesametime,thecloudsandrainoverthewarm
watermoveeastwardtoo.RadaraboardtheAmerican-Frenchsatellitedetectedthehintthat
suchwatermovementbeganinearlyAugustandreachedSouthAmericatwomonthslater.It
sawaripplecalleda“Calvinwave”movingslowlyeastward.SuchpulsessometimesgiverisetoElNinoconditionsintheeasternequatorialPacific.
ElNino’scanchangetheweatheraroundtheworld,buthowmuchdependsonitsstrength.A
strongonein1982and1983hasbeenlinkedtodroughtsinAustraliaandIndonesia,rains
andfloodinginSouthAmerica,andunseasonablyin1991hascausedtrouble.Ithasbeen
associatedwithdevastatingfloodsintheUSsoutheastlastyearandintheUSMidwestthis
year.ElNino’sarehardontheSouthAmericanfishingindustry.Thewarmwatersprevent
nutrientsrichcoldwaterfromrisingtothesurface,causingfishstockstobecome
depletive.Mr.JackersaidanewElNinoapparentlywouldbemildbutheisnotbettingon
ityet.
TheUSNavaloceanographersayspredictionsaredifficultbecausethestrengthofElNino
dependsonhowwindsaffecttheCalvinwavethathasmovedacrossthePacific.
PartIIILickObservatory
B.location:
anhour’sdrive/summit/
Originofthename:
awealthybusinessman
Size:
onemeterdiameter/second
Time:
1888
Presentfunction:
research/aneducationaltool
C.wayofobservation:
humaneyes;inthecold/TVscreen
Gainsandlosses:
Romance/thesky/efficiency/reality/universe
Questions:
BecauselickObservatoryisnear“SiliconValley”,aregionofthestateshigh-
technology.
BecauseLickObservatorywasbuiltonhisestateandhewasburiedatthebaseofthe
telescopeatthiswonrequest.
Byusingthe19thcenturytelescope,youhaveafeelingofromancewithdirectviewingwith
thehumaneyes.Bysingthemoderndevices,youlosethatromancebutgaintheefficiency.
That’sanexchange.
It’saboutanhour’sdrivefromtheoutskirtsofSanJose,California,neartheupper
sideofthestate’shigh-technologyregionknownasSiliconValley.Asavisitordrivesup
thenarrowwindingroadpastredflowers,andeucalyptustrees,oneofthefirsttwo
seismographicstationsintheworld,it’salmostasurprisetoglimpsethelargestdomeof
LickObservatory’seighttelescopes.Overlookingtheworldofcomputeragemanufacturing
aretelescopesfromtheturnofthecenturywhichhelpshapeourunderstandingofthe
universe.
Thehugedome,housingLickObservatory’sgiant,onemeterwidereflectingtelescope,is
oneofthefewinstrumentsinmotionthismorningonMountHamilton.Atthe1260-meter
summitofMountHamiltonisasmallvillageof55permanentresidents,someofthem
studentsinaone-roomschoolhouse.Butmostattheresearchcomplexarevisiting
astronomerscatchingtheirfirsthoursofsleepinanolddormitoryafteranight’swork
atthetelescopes.RemintonStone,directorofoperationsatLickObservatoryhasworkedat
thetopofMountHamiltonforthreedecades.NowapartoftheUniversityofCalifornia,
LickObservatorygotitsnamefromawelthybusinessmanwhoneverstudiedastronomyasMR.
Stoneexplains:
“AndhecametoSanFrancisco,justbeforethegoldrushandhemadeahuge
amountofmoneyonrealestate.Whenhedied,hespecifiedthatsomeportionofhisestate
shouldbeusedtobuildthelargestandmostpowerfultelescopeyetmadeandwhichwasa36
inchatthattime.Andathisownrequestheisburiedatthebaseofthetelescope.So
thissamemorialtohimself.”
Thetelescopewithitsode-meter-diameterreflectinglenswasthelargesttelescopeinthe
worldforsevenyearsfollowingitscompletionin1888.andtoday,its’stillthesecond
largesttelescopeofitskind.Althoughtheonemeterreflectingtelescopeisstillused
forsomeresearch,itshardtoadapttoday’selectronicinstrumentstotheoldhistoric
telescope.Now,itisusedmostlyasaneducationaltoolforteachersandthethousandsof
visitorswhocomeeachyear.WhiletheothertelescopesatLickObservatoryareconnected
toelectronicimaginedevicesthatallowtheastronomerstoviewcelestialobjectson
televisionscreens,the19thcenturytelescopeallowsdirectviewingwiththehumaneye.It
’soneofthefewgianttelescopesintheworldthtstillrequiressomeuserstositout
inthecoldunderthedarkskyandthedome.ThatbringsafeelingofnostalgiatoReminton
Stone.
Ireallydomissbeingabletoseethesky,andseeingthesewonderfuldataappearinthe
computerscreenisreallynice,butit’sverydivorcedfromthereality,fromthe
universe.Imissalotbeinginadarkplaceinthesefieldstolookuptoseethestars.
Wegoouteverynowandthenifweareworkingat…,we’reatthecontrolroom,wedogo
outtokeeptrackoftheskies,wherethecloudsare,andsoforth,butonelosesthe
romanceandonegainsgreatlytheefficiency.It’satrade-off.
AstronomerRemintonStone,whomanagestheLickObservatorycomplexatthetopofmount
Hamilton,California.
PartIV.ThenationalclimaticDataCenter.
Outline
I.A.1951B.headquartersC.satellites,radar,solarradiationsystem,airplanes,ships
II.B.collectingweatherrecordsfromaroundtheworldD.publicationsaboutearth
environment.E.requestsfroinformationfromallovertheworld.
questions.
TheDepartmentofDefense,theNationalWeatherService,thecoastguard
TheofficehaswrittenweatherobservationsmadebyearlyAmericandiplomatBenjamin
FranklinandbythethirdPresidentoftheU.S.
Youcangettheinformationbycomputer,microfilmandtelephone
Americancities.Anotherpublicationhasmonthlyreportsfrom1500observationstations
aroundtheworld.
Thecenterhadmorethan900,000requestsfromgovernmentofficials,businessowners,
weatherresearchersandthegeneralpubliclastyear.
Moreandmorepeopleneedtoknowabouttheweather.Anyonewantinginformationaboutpast
weatherconditionscanturntoacentersupportedbytheUnitedStatesgovernment.
TheNationalClimaticDataCenterreportedlyhastheworld’slargestactivecollectionof
weatherinformation.TheNationalClimaticDataCenterorNCDCwasformedin1951.itwas
establishedasarecordcenterforAmerica’sDepartmentofCommerce.Itsheadquartersis
inthesoutherncityofAsheville,NorthCarolina.
TheNCDCcollectsweatherrecordsgatheredbyanumber
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