摘要
Carbonmonoxide(CO)playsasignificantroleinglobalwarmingandatmosphericchemistry.GlobaloceansarenetnaturalsourcesofatmosphericCO.COatsurfaceoceanisprimarilyproducedfromthephotochemicaldegradationofchromophoricdissolvedorganicmatter(CDOM).Inthisstudy,theeffectsofphotobleaching,temperatureandtheorigin(terrestrialormarine)ofCDOMontheapparentquantumyields(AQY)ofCOwerestudiedforseawatersamplescollectedfromJiaozhouBay.Ourresultsdemonstratthatphotobleaching,temperatureandtheoriginofCDOMstronglyaffectedtheefficiencyofCOphotoproduction.Theconcentration,absorbanceandfluorescenceofCDOMexponentiallydecreasedwithincreasinglightdose.Terrestrialriverineorganicmattercouldbemorepronetophotodegradationthanthemarinealgae-derivedone.TherelationshipsbetweenCOAQYandthedissolvedorganiccarbon-specificabsorptioncoefficientat254nmforthephotobleachingstudywerenonlinear,whereasthoseoftheoriginalsampleswerestronglylinear.Thissuggeststhat:1)terrestrialriverineCDOMwasmoreefficientthanmarinealgae-derivedCDOMforCOphotoproduction;2)aromaticandolefinicmoietiesoftheCDOMpoolwereaffectedmorestronglybydegradationprocessesthanbyaliphaticones.WatertemperatureandtheoriginofCDOMstronglyaffectedtheefficiencyofCOphotoproduction.ThephotoproductionrateofCOinautumnwasestimatedtobe31.98μmolm-2d-1andthetotalDOCphotomineralizationwasequivalentto3.25%-6.35%ofprimaryproductioninJiaozhouBay.OurresultsindicatethatCOphotochemistryincoastalareasisimportantforoceaniccarboncycle.
出版日期
2014年03月13日（中国期刊网平台首次上网日期，不代表论文的发表时间）
