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1、ImprovingaccuracymeasurementofopticalpropertiesUnderwayandmooredmethodsforimprovingaccuracyinmeasurementofspectralparticulateabsorptionandattenuationWayneH.Slade(1),EmmanuelBoss(1),GiorgioDall'Olmo(2),M.RoisLangner(3),JamesLoftin(1),MichaelJ.Behrenfeld(2),andCollinRoesle
2、r(4)(1)SchoolofMarineSciences,5706AubertHall,UniversityofMaine,Orono,ME(2)DepartmentofBotanyandPlantPathology,OregonStateUniversity,Corvalis,OR(3)Formerlyof:BigelowLaboratoryforOceanSciences,WestBoothbayHarbor,ME(4)DepartmentofGeology,BowdoinCollege,Brunswick,MECorrespon
3、dingAuthorContact:wayne.slade@gmail.com5706AubertHallUniversityofMaineOrono,ME04469SubmittedtoJournalofAtmosphericandOceanicTechnology(JAOTO.755)46ImprovingaccuracymeasurementofopticalpropertiesAbstractOpticalsensorshavedistinctadvantageswhenusedinoceanobservatories,auto
4、nomousplatforms,andonvesselsofopportunity,becauseoftheirhigh-frequencymeasurements,lowpowerconsumption,andthenumerousestablishedrelationshipsbetweenopticalmeasurementsandbiogeochemicalvariables.However,theissuesofbio-foulingandinstrumentstabilityovertimeremaincomplicatin
5、gfactorswhenopticalinstrumentsareusedoverperiodslongerthanseveraldays.Here,amethodforobtainingcalibration-independentmeasurementsofspectralparticleabsorptionandattenuationispresented.Flowthroughopticalinstrumentationisroutinelydivertedthroughalargesurfacearea0.2mmcartrid
6、gefilter,allowingcalculationofparticleopticalpropertiesbydifferenceoftemporally-adjacentfilteredandwholewatersamples.Thisapproachyieldsmeasurementsthatareindependentofdriftininstrumentcalibration.Themethodhasadvantagesnotonlyforcoastalmooreddeployments,butalsoforapplicat
7、ionsinopticallyclearwaterswhereuncertaintiesininstrumentcalibrationcanbeasignificantpartofthesignalmeasured.ThedifferencingtechniqueisdemonstratedusingWETLabs(Philomath,OR)ac-9andac-smulti-andhyper-spectralabsorptionandattenuationmeters.Fortheac-ssensor,acorrectionscheme
8、isdiscussedwhichutilizesthespectralshapeofwaterabsorptioninthenear-infraredtoimproveaccuracyoftemperatu
