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1、1007-4619(2012)01-176-18JournalofRemoteSensing遥感学报Purewaterabsorptioncoefficientmeasurementaftereliminatingtheimpactofsuspendedsubstanceinspectrumfrom400nmto900nmDENGRuru,HEYingqing,QINYan,CHENQidong,CHENLeiSchoolofGeographyandPlanning,CentreforRemoteSensingandGeograph
2、icalInformationSciences,SunYat-senUniversity,GuangdongGuangzhou510275,ChinaAbstract:Inthispaper,wedesignedanewdevicewhichcanbeusedtomeasuretheabsorptioncoefficientofpurewaterdi-rectly.First,wemeasuredtheirradianceofdirectlightpenetratingthroughdifferentthicknessesofwat
3、erlayers.Thenweusedtheratiomethodtoeliminatetheimpactofmeasuringinstrumentsonexperimentalresults.Finally,weacquiredtheextinctioncoefficient.Theextinctioncoefficientexperimentprovedthatextinctioncoefficientofsuspendedsubstanceinwatercanbecalcu-latedbyformulaofÅngstrom.W
4、ethereforeputforwardamethodonhowtoeliminatetheimpactofsuspendedsubstanceinpurewaters.Eventually,wedeterminedtheabsorptioncoefficientofpurewaterfrom400nmto900nm.Comparingwithpreviousstudies,overallresultsareconsistent,butwithbetterprecisioninthelongwavelength.Theabsorpt
5、ioncoefficientofpurewatercanbeusedasthenormaldataforwaterqualityremotesensing.Keywords:absorptioncoefficient,purewater,suspendedsubstance,extinctioncoefficientCLCnumber:TP701Documentcode:ACitationformat:DengRR,HeYQ,QinY,ChenQDandChenL.2012.Purewaterabsorptioncoefficien
6、tmeasurementaftereliminatingtheimpactofsuspendedsubstanceinspectrumfrom400nmto900nm.JournalofRemoteSensing,16(1):176–1931INTRODUCTIONBaker(1981)selectedaconsistentaccuratesetofdatafortheopticalpropertiesoftheclearestnaturewaters.TheyalsoprovidedSincewaterplaysanimporta
7、ntroleinmanyscientificdisci-upperboundestimatesfortheabsorptioncoefficientofpurewater.plines,e.g.,chemistry,biology,meteorologyandabsorptionspec-Theirworkindicatesthatmostmeasureddatumofabsorptioncoef-trumofpurewaterhasawideuseinmanyareas.Largeamountficientonopticalspe
8、ctrumarelargerthantheiractualvalues.Errorsofexistingstudies(Morel,1974;Querry&Cary,1978;Patel&Tam,mainlycomefromthesc
