history of ocean exploration 9 april 2018 - uaf.edu · navigator who observed the sun’s height at...
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HistoryofOceanExploration
9April2018• MarkJohnson,PhysicalOceanography(oceanphysics)
• Seehttp://www.uaf.edu/cfos/people/faculty/detail/index.xml?id=146
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THEN:DarwinleftLondonforPlymouthon16October1831toprepareforthestartofthevoyage.Afewofthescientificitemshebroughtwithhimincluded:1microscope(asinglelensmodelbyBancks&Son,London)1geologicalcompass,1plaincompass2pistols(withspareparts),1rifle(withspareparts)1telescope1geologicalhammer5simisometers[probablysympiesometer,alightweight
barometer]3mountainbarometers1clinometer1cameraobscura1hygrometer(belongedtoFitzRoy)NOW:
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Darwinwasgivenquartersinthechartroom,onedeckaboveCapt.FitzRoy'squarters,atthesternoftheship.Itwas9feetby11with5feetofheadroomwithbookshelves,cabinets,anoven,andawashstand,plusa4x6charttableinthemiddle.Therewasabout6feetby8feetofroomtoworkin.Darwinlivedinthisroom,onandoff,fornearlyfiveyearssettingthestageforhisthetheoryofevolution.
Beaglereplica(90ft)RVSikuliaq(262ft)
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Astudyofhistoryusesthepasttobetterunderstandthepresent.
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Wherearewe?TheearlyPolynesiansknewabuttheocean,withoutlatitudeandlongitude,clocks,orsatnavigation.
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Estimatingone’slatitudewasdonebythenavigatorwhoobservedthesun’sheightatnoon.Atnight,thepositionoftheNorthStarandtheorientationofmajorconstellationshelpeddetermineaship’slocation.SolutionstofindingthecorrectlatitudebeginwiththeArabnavigatorswhousedthe“Kamal,”alengthofcordattachedatthecentertoarectangleofwood.Thecordhadknotsinitthatcorrespondedtothelatitudeofknownports.Thenavigatorheldtheknottohiseye,lineduptheloweredgeoftheboardwiththehorizonandtheupperedgecorrespondedtothecorrectlatitudewhenitalignedwiththenoonsun.
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TheCross-staff,inventedaround400B.C.,wasproposedfornavigationbyJohannWernerin1514.Thecross-staff’ssinglevanewasmovedtotoalignthehorizonandthesunorothercelestialbody.Ithadtwocriticalproblems.First,theuserwaslookingdirectlyattheblindingsun,andsecond,tryingtosightitandthehorizonatthesametimemeanthavingtofocusontwoobjectssimultaneously,animpossibletaskforthehumaneye.
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TheQuadrant,adeviceformeasuringthealtitudeofacelestialbody,wasfirstrecordedinusein1461.TheQuadrantdidnotrequiresightofthehorizon.ItdidrequirestaringintotheSuninordertofinditsaltitude.
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TheAstrolabewasadaptedformarinenavigationaround1480.Itwasheldbythethumbringatthetop,aboveeyelevelandthealidade,thepointerinthecenter,wasalignedtopointtothesun.Thealtitudewasthenreadoffthewheelandthatcorrespondstothelongitude..
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Longitudeisadifferentproblem,anddependsonknowingthetime,whichwasmeasuredbyasandglass.Notuntiltheinventionofthechronometerinearly1700sdidestimatinglongitudebegintobereliable.Measuringtimeatsea,hencemeasuringlongitude,wassolvedwiththeinventionofthechronometerinearly1700sbyJohnHarrison.OncelocaltimewasknownasanoffsetfromLisbon(orone’shomeport),thenestimatinglongitudewaspossible.JamesCookhadtwoHarrisonchronometersonboardtheEndeavorduringhisfirstPacificnavigationin1768.
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NOW:GPSprovidespositioningtowithinameterorless.
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Earlyoceanexplorationfocusedonmappingtheworldandexpandingtheknownboundaries.
AtleftisCook’sdrawingsofTahitimadewhileobservingtheTransitofVenusin1769.AtrightisasatelliteviewofTahitifromGoogleEarth.GoogleEarthusesLandsatimagerynearly250yearslatertoshowanimprovedpictureofMoorea.Bothimagesshowtheshallowbeachessurroundingtheislands.GoogleEarthimagehasbetterinlanddetails.
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1665:RobertHooke’sinstrumentformeasuringpressure(depth)
RobertHooke’sinstrumentforcollectingwatersamples
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AFundamentallyImportantOceanographicExpeditionfrom1872-1876TheHMSChallenger,asailingshipof2,300tonswithauxiliarysteampower,conductedoneofthemajorexpeditionseverwithfundingfromtheTheBritishRoyalSociety.Challengerwastaskedtosystematicallycollectobservationsoftheoceansevery200milesandmeasurethedepthtotheseafloorandmeasuretemperatureatvariousdepths.Usingasoundingrope,theycollectedwatersamplesanddredgedthebottomforrocksanddeep-seamarinelife.TheChallengerexpeditionestablishedthegeneralprotocolforallexpeditionstofollowinthenext50years.Theresultsfromtheexpeditionfillastaggering50volumes.
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ModernOceanography
• Fourmaindisciplines– Biological– Chemical– Geological– Physical
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AdvancesinGeologicalOceanographyThedevelopmentofthetheoryofPlateTectonicswasascientificrevolutiondatingtoWegner'stheoryofcontinentaldriftfromthe1920s.
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AmajoradvanceingeologicalOceanographyisthereconstructionoftheearthspaleo-climatesfromdeepseacores.
Deep-seadrillshipJoidesResolution
Coresbeingsampled.
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PriortoWorldWarII,biologicaloceanographyhadtwocentralthemes.Fisheriessciencewasthefirsttheme,focusingonfindingwherethegreatfisherieswerelocated,whytheyvariedinspaceandtime,andattemptedtofindwheremoreresourcesbefound.Todaythisfieldisreally“fisheriesoceanography.”
Achievementsinbiologicaloceanography
Thesecondmajorthemewassimplynewdiscoverieswherethegoalwasincreasingknowledgeforthesakeofknowledge.AfterWWII,theproblemsofpollutionanditstransportrequiredthatweknowhowtheoceanfunctionedsoitcouldbemanagedandtheconceptofsustainabilitybecamemorewidespread.
AfterWWII,oneofthemostimportantbiologicaloceanographicdiscoverieswastheunexpectedfindingofchemosynthetichydrothermalventcommunities.Insteadofsunlight,thesecommunitiesreliedonbacteria.Theywerefirstdiscoveredin1977neartheGalapagosislands.
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Thishydrothermalventcommunity,locatedontheGalapagosRift,includesgianttubeworms(Riftiapachyptila),mussels(Bathymodiolusthermophilus),andcrabs(Bythograeathermydron)atadepthof2,500mdepth.(PhotobyFredGrasslel,WHOI)
Chemosyntheticecosystemshaveturnedupeverywhereintheocean:onthecontinentalshelvesandslopes,inthedeepsea,atplatemargins,andridgecrests
Autotrophicbacteria(abletoformnutritionalorganicsubstancesfromsimpleinorganicsubstancessuchascarbondioxide)oxidizehydrogensulfideinventwatertoobtainenergy,whichisthenusedtoproduceorganicmaterialforgrowth.Theprimaryproducers(plantsinourphotosyntheticworld)intheventsarechemosyntheticbacteriathatformthebaseofventfoodwebs.Allventanimalsultimatelydependonthesebacteriaforfood.
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In1978,theCoastalZoneColorScanner(CZCS)waslaunchedandshowed,forthefirsttime,thecoherenceofoceanbiology,revealingitspatterns,variability,andcomplexity,totheoceanographiccommunity.
CZCSwasfollowedin1997byanimprovedU.S.oceancolorsatelliteSea-ViewingWideFieldofViewSensor(SeaWiFS).
Oceancolorshowedthat(1)theoceanisveryundersampled,(2)mesoscale(basin)physicalprocessesdeterminethespatialdistributionofphytoplankton,(3)bottomtopographyorbathymetryinfluencesplantbiomass,(4)thereiscomplexityintheseasonalphytoplanktonsignal,and(5)themagnitudeofinterannualvariabilityisbetterknown.
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Specificadvancesinbiologicaloceanography1. Understandingofdeep-seadiversityinthelate1960sfueleddebatesonhowdiversityis
maintainedinalarge,monotonousenvironment.
2. ThelandmarkachievementbyDugdaleandJohnGoering(1967)showingthatprimaryproductivityintheoceancanbedividedintolocallyrecyclednutrients,regeneratedproduction,andnewnutrientstransportedintotheeuphoticzoneasnewproduction.Thisisdrivenbythephysicalprocessesofmixingandupwelling.
3. Determiningthatzooplanktonswim,feed,breed,andliveinaviscous,highlystructuredmedium.
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In1998,amajoroceanographicdiscoveryoceanographycamefromestimatesofsubseafloorsedimentarymicrobialabundancewhichsuggestedmicrobesmayaccountfor27–33%ofEarth’slivingbiomass.Thisisanastonishingandpreviouslyunheardamountofbiomass,althoughmorerecentestimatesreducethisestimatesomewhat.
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AdvancesinChemicalOceanographyAristotleconsideredtheoriginsofsaltinthesea,and,sinceAristotle'stime,manyscientistshavemadesignificantcontributionstounderstandingthechemistryoftheoceans.In1647,RobertBoylewrote"ObservationsandExperimentAbouttheSaltnessoftheSea”,whichestablishedhimasthefounderchemicaloceanography.
ItwasWilliamDittmarwhoundertooktheanalysesofseawatertoestablishtheconstancyofratiosofthemajorionsinseawater.Dittmar'sreportonseawaterchemistrybasedonthe77watersamplesofthe'Challenger'expeditionwasthemostextensiveseawateranalysisperformedatthattime.
Thefocustodayisonuseofgeochemicaltracersandquantifyingratesandfluxes,particularlyofcarbonasCO2andradionuclides.
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AchievementsinPhysicalOceanography
Inthe1940sand1950sageneralunderstandingoftheabyssalcirculationwaslaid-out.Inthe1950s,thebasiccurrentsweresowellknownthatthesurfacecurrentswereonhandkerchiefsgiventopilotsshouldtheyneedit.Seehttp://www.escape-maps.com/escape_maps/map_list_wwii_us_liferaft.htm
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AchievementsinPhysicalOceanography
TheEkmanSpiralAllstudentsofoceanographylearnabouttheEkmanspiral,anelegantearly-centurymathematicalsolutiontothewind-drivencurrentprofile.
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AchievementsinPhysicalOceanography
Duringthe1950sand1960s,thedevelopmentofthe“Hydrographicmethod”allowedoceanographerstodeterminecurrentsbasedonmeasurementsofTemperature,Salinity,andPressure.
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AchievementsinPhysicalOceanography
Advancesinourthinking:Pre-1970theoceanwasviewedas“steadystate”.After1970thefocuswasonmesoscale(basinscale)variabilitywhere99%ofthekineticenergyisfound.Thisincludesinternalwaves,edgewaves,mixingevents,andothertime-dependentprocesses.TheoceanisMUCHmoreenergeticthanwerealized.Today,weaskwhereistheoceanenergysuppliedbythewinddissipated?Howanoceanproductivitybesustained?Whatroledooceancurrentsplayintransportingheataroundtheplanet?
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AcousticThermometry
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Today,manyofthescientificeffortsarefocusedonrestoringormaintainenvironmentalhealth.
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