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11-%20Climate%20Change%20Part%202.docx

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Department
Life Sciences
Course
LIFESCI 2H03
Professor
Luc Bernier
Semester
Winter

Description
Feb112013Lecture11ClimateChangeTheLast2000YearsPart2pacificDecadalOscillationassociatedwithrelativelycoldwatersoffthecoastofAsiacorrespondstoElNinoinsomecasesPositiveWarmPhaseitswarmwaterispositiveNegativeCoolPhaseColdwateroncoastofAlaskaandBCwarmwateroffthecoastofasiaCoolphasetendstobeassociatedwithcoldertemperaturesgenerallyfisheriesarenotasabundantCauseofLittleIceAgeNAOscillationPositivephasereversalofpressurethatisoccurringintheNorthAtlanticLowpressureoncoastofIcelandWetconditionsthatarerelativelywarmandDryconditionsoverAfricaandNorthCanadaAzoresStronghighpressurepointNegativePhasewindsarenotasstrongdifferencesinpressurearenotasclearcutsowindsarenotasstrongWetanddryconditionsarereversedOverallOneofthepossibleexplanationsastowhytherewasalongspellofabruptcondiionsinNorthernEuropeRapidchangesareassociatedtoAnthropogenicActivityGreenhousegasesincreasingtheamountofheattrappedatthesurfaceOriginallyoffsetbyaerosolsintheatmospherebutaerosolsdiminishedandledtoonlyaffectsofgreenhousegasesabruptwarmingImpactoftectonicprocessesCollisionofIndiawithAsialedtoincreasedchemicalweathering000001degcelciuspercenturytectonicshasverysmalleffectsonglobalwarmingtrendsDropof510degcelciusoverpast100millionyearsImpactofOrbitalscaleEarthssurfaceduetotiltsSlightlymore016degcelciuspercenturystillsmall1degcelciusinpast1000000yearsNaturalclimateshowsweshouldbegoingintoglaciationsbutweseeanincreaseinglobaltemperaturesSunspotspast2530yearsamountofsolarradiationreceivedvstheimpactonthenumberofsunspotsgoodcorrelationbetweenthetwo11Yearcycleleadingtochangesin15inSolarIrradianceduringthecycleReallydifficulttodistinguishintermsofnaturalprocessesotherassocationssuchasalbedodoesnotexplaintrendsofglobalwarmingElNinoandSouthernOscillationcouldcontributedsomeofthetrendsourrecordsarefairlyrecentPatternofElNinocycleofwarmwatersofSAimpactonglobalsurfacetemperaturescorrespondstopeakglobaltemperaturesinthesshownDecreaseinsealevelpressureandPrecipitationaswellinNorthAustraliaContributedtosomeextentthepatternswehaveobservedPacificDecadalOscillationdurationofcycleislonger15yearsPositivePhasewarmwatersofNAandcoldwatershave15yearsdifferenceCouldhavecontributedwearecurrentlyinawarmphasebutnotasconsistentasitusedtobesomecoolerphasesinwarmphase
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