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ChemicalMassBalanceSoftware:EPA-CMB8.2C.ThomasCoulterAirQualityModelingGroupOfficeofAirQualityPlanning&StandardsU.S.EnvironmentalProtectionAgencyResearchTrianglePark,NC27711JohnV.ScalcoIdealSoftware,Inc.P.O.Box298Apex,NC27502GoverningEquationCiistheambientconcentrationofspeciei;aijisthefractionalconcentrationofspecieiintheemissionsfromsourcej;Sjisthetotalmassconcentrationcontributedbysourcej;andpisthenumberofsources,andnisthenumberofspecies,withn

≥

p.TheCiandaijareknownandtheSjarefoundbyaleastsquaressolutionoftheoverdeterminedsystemofequations.FEATURESWindows®-based,event-drivenoperationsMultiplearraysforfittingspeciesandfittingsourcesBritt-LueckealgorithmImprovedcollinearitydiagnosticsBetterhandlingofVOCapplications

Searchforbestfit

User-selectedpreferencesFEATURES(cont’d)NegativesourcecontributionsImprovedmemorymanagementUpgradedlinearalgebralibraryVersatilegraphicdisplaycapabilityContext-sensitiveon-linehelpFlexibleinputandoutputformatsFilehandling Previously EPA-CMB8.2SourcePRofileselectionfile: SO*.sel

PR*.selSPeciesselectionfile: PO*.sel

SP*.selAmbientData(sample)selectionfile: DS*.sel

AD*.selLaunchingtheEPA-CMB-8.2SoftwareClickBrowseDialogfor

SelectingaControlFileClickWeloadtheSanJoaquinValleyFinedataset(Chowetal.,1992).ClickBannerPageviaHelp|AboutClick

ControlFilenameisechoed,asareany inputfilesitdirectstoload.Usebrowseboxestoadd/changeinput filesduringasession.ClickClickThisparametersetsthemaximumnumberofiterationsEPA-CMB8.2willattempttoarriveatasolution.Ifnoconvergencecanbeachieved,thereisprobablyexcessivecollinearityforthissampleandcombinationoffittingsources.Itsvalueisadjustedviathespinners.(Mustbe>0;notheoreticalupperlimit;default=20)AllowstheeligiblespacecollinearityevaluationmethodofHenry(1992)tobeimplementedwitheachCMBcalculation.Themaximumsourceuncertaintyisathresholdexpressedasapercentageofthetotalmeasuredmassandisadjustableviathespinners(default=20%;acceptablerange0-100).AllowstheeligiblespacecollinearityevaluationmethodofHenry(1992)tobeimplementedwitheachCMBcalculation.Theminimumsourceprojectionissettoadefaultvalueof0.95(acceptablerange0.0-1.0),butcanbechangedinthedisplayfield.Thisparametersetsthenumberofdecimalplacesdisplayedintheoutputwindowandoutputfiles.Dependsontheunitsusedintheinputdatafiles.Settingaffectsthedisplaycolumnsforsourcecontributionsestimates,measuredspeciesconcentrations(ambientsamplesandsourceprofiles),calculatedcontributionsbyspecies,aswellasforinversesingularvalues.Adjustedbyusingthespinners.Thedefaultvalueis5andthemaximumvalueis6.Theunitsusedforreportingresultsmaybechangedviaapull-downmenu.Othertypicalunitsareavailable,oronemaybecreated(thenumberofcharactersislimitedto5orless).Fileformatforspreadsheet-typeoutputisselectedinthepull-downbox.DefaultisASCII(txt);comma-separatedvalue(CSV)isalsoavailable.Selectionisechoedonthestatusbaratthetopofthescreen.CheckingthisboxappliestheBrittandLuecke(1973)linearleastsquaressolutionexplainedbyWatsonetal.(1984)whenappliedtoCMBcalculations.Allowsthesourceprofilesusedinthefitcalculationtovary,andenablesageneralsolutiontotheleastsquaresestimationthatincludesuncertaintyinallthevariables(i.e.,thesourcecompositionsaswellastheambientconcentrations).Checkingthisboxeliminatesnegativesourcecontributionsfromthecalculation,oneatatime.Aftereachfitattempt,ifanysourceshavenegativecontributions,thesourcewiththelargestnegativecontributioniseliminatedandanotherfitisattempted.ProcessisrepeateduntilEPA-CMB8.2findsnosourceswithnegativecontributions.Invocationofthisoptionaffectsthefitobtainedbyeffectivelyremovingcollinearsources.Causestheprogramtocyclethroughthecorrespondingpairs(samearrayindex)offittingspeciesandsourceprofilearraysspecifiedinthesourceandspeciesselectioninputwindowsuntilbestcompositeFitMeasurehasbeenachieved.ThefitwiththelargestFitMeasureisthendisplayedandbecomesthecurrentfit.AfteraBestFithasbeenmade,thefittingspeciesandfittingsourcesarrayswillbetagged(highlighted)intheirrespectivewindows.Weights(coefficients)appliedtoeachoftheperformancemeasureschisquare,r-square,percentmass,andfractionofeligiblesources.Positivevaluesbetween0and1maybeenteredbytypingintotheappropriatedisplayfields.Defaultsare1.0foreachperformancemeasureweight.ClickClickClickCollapsedlistofsamples.ClickClickClickIndexNumberClickClickIndexNumberClickClickClickClickCollapsedviewforArray5NB:Sampleselectionwillberetainedfollowingthebatchcalculation.SamplescaneasilybeDEselectedandREselectedontheAmbientDataSamplesscreen.ClickClickBatchrunforthe6samplestagged…3rdresultofthe6inthebuffer…SUMClickPrint/SaveMainReportClickClickClickClickClickSavespreadsheet-typeresultsClickSPcode

SPnameISiteIDDATESTDRSIZEMconc

Munc

Cconc

Cunc

Rsquare

CHIsqr%MASSSJV001SOIL01TMACTMAUFELLOW07/26/88024FINE21.536301.1900020.619571.055510.912764.8686395.743324.725330.30812N3ICN3IU*FELLOW07/26/88024FINE0.212800.185200.256880.059220.912764.8686395.743320.012760.02221S4ICS4IU*FELLOW07/26/88024FINE5.147500.270905.645510.507300.912764.8686395.743320.001890.00614N4TCN4TU*FELLOW07/26/88024FINE1.915400.133301.721040.175200.912764.8686395.743320.002840.00236KPACKPAU*FELLOW07/26/88024FINE0.115100.023800.101790.038010.912764.8686395.743320.004730.00142NAACNAAU*FELLOW07/26/88024FINE0.148800.058300.134990.031600.912764.8686395.743320.004250.00189ECTCECTU*FELLOW07/26/88024FINE0.817200.198101.812630.499710.912764.8686395.743320.129950.05434OCTCOCTU*FELLOW07/26/88024FINE3.892600.457802.745720.615830.912764.8686395.743320.484820.06521ALXCALXU*FELLOW07/26/88024FINE0.295100.030000.449820.051060.912764.8686395.743320.447960.05103SIXCSIXU*FELLOW07/26/88024FINE0.943300.061201.173690.134670.912764.8686395.743321.150140.13042SUXCSUXU_FELLOW07/26/88024FINE2.016400.102001.834510.157980.912764.8686395.743320.009450.00520CLXCCLXU*FELLOW07/26/88024FINE0.027500.007100.050080.015150.912764.8686395.743320.003310.00047KPXCKPXU*FELLOW07/26/88024FINE0.163200.010600.145030.029870.912764.8686395.743320.048670.00567CAXCCAXU*FELLOW07/26/88024FINE0.178200.011600.094460.010200.912764.8686395.743320.088360.00992TIXCTIXU*FELLOW07/26/88024FINE0.029800.006900.025050.002880.912764.8686395.743320.024570.00284VAXCVAXU*FELLOW07/26/88024FINE0.036600.003700.038360.002750.912764.8686395.743320.001420.00047CRXCCRXU*FELLOW07/26/88024FINE0.006600.001800.001870.000900.912764.8686395.743320.001420.00000MNXCMNXU*FELLOW07/26/88024FINE0.005800.001000.006320.000750.912764.8686395.743320.005200.00047FEXCFEXU*FELLOW07/26/88

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