Characteristics of Kd （490） around Nansha Islands in the South China Sea-中国Betway体育网页登陆

摘要 Thediffusionattenuationcoefficientfordownwellingirradiance,Kd(490),isanimportantopticalparameterofseawater.Theopticalproperty,Kd(490),aroundNanshaIslandsintheSouthChinaSeawasanalyzedbasedonopticaldataprofilesmeasuredwithSPMR(SeaWiFSProfilingMultichannelRadiometer)andSMSR(SeaWiFSMuitichannelSurfaceReference)instrumentinAprilandMay,1999.TheresultsshowthatKd(490)iscloselycorrelatedwithchlorophyll-aconcentration,Cchl.a,andthattheverticaldistributionofKd(490)showsthestrongstratificationofthewatercolumninthisarea.Kd(490)hasasimilarverticalco-variationasKL(490),thediffusiveattenuationcoefficientforupwellingradiance.Bothcoefficientsincreasewithdepthintheupperlayer,whereKL(490)isgreaterthanKd(490);andafteradepth,approximativelyatthechlorophyllmaximum,theydecreasewithdepth,withtheformerbeingsmallerthanthelatter.

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Characteristics of Kd （490） around Nansha Islands in the South China Sea

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