天然水体中CDOM光漂白：动力学和模型

天然水体中CDOM光漂白：动力学和模型Photobleachingofchromophoricdissolvedorganicmatterinnaturalwaters:kineticsandmodelingRossanaDelVecchio,NeilV.Blough*DepartmentofChemistryandBiochemistry,CollegeofLifeSciences,UniversityofMaryland,CollegePark,MD20742,USAReceived2August2001;receivedinrevisedform29April2002;accepted30April2002AbstractTheeffectsofmonochromaticandpolychromaticUVandvisible(VIS)radiationontheopticalproperties(absorptionandfluorescence)ofchromophoricdissolvedorganicmatter(CDOM)wereexaminedforaSuwanneeRiverfulvicacid(SRFA)standardandforwaterfromtheDelawareandChesapeakeBays.Theprimary(direct)lossofabsorptionandfluorescenceoccurredattheirradiationwavelength(s),withsmallersecondary(indirect)lossesoccurringoutsidetheirradiationwavelength(s).Theefficiencyofbothdirectandindirectphotobleachingdecreasedmonotonicallywithincreasingwavelength.ExposuretopolychromaticlightincreasedtheCDOMabsorptionspectralslope(S),consistentwithpreviousfieldmeasurements.Ananalysisofthemonochromaticphotobleachingkineticsar