Understanding Observed Stratocumulus Variability and Implications for Aerosol Indirect EffectsOutlineIntroductionObservational effect of N on kMASEData DescriptionPrinciple Components AnalysisPrinciple Components Analysis: N0EOF: N0Principle Components Analysis: NEOF: NPrinciple Components Analysis: NR2EOF: NR2North TestSummaryNathan JohnsonOutlineEffects of aerosols on ClimateSusceptibilityObservations of Microphysical QuantitiesMArine Stratocumulus ExperimentPrinciple Components AnalysisIntroductionIndirect Effects of Aerosols on ClimateTwomey / Albrecht / DispersionObservational effect of N on kk increases with increasing NPruppacher and Klett (1997)Miles et al. (2000) ???Yum and Hudson (1997)Lu and Seinfeld (2006) (Modeling)Feingold et al. (1997) (Modeling)Lu et al. (2007)k decreases with increasing NMartin et al. (1994)Ackerman et al. (2000) McFarquhar and Heymsfield (2001) ???Liu and Daum (2000, 2002)Peng and Lohmann (2003) (Sensitivity)MASENLkLe g ALT CDN C K LWC6 534 199 0.76 0.337 627 189 0.8 0.4416 636 182 0.67 0.3Data DescriptionPrinciple Components Analysis% Variance Explained by Mode: 1 2 3CDNC 0.746 0.226 0.028LWC 0.879 0.001 0.120k 0.767 0.191 0.042Principle Components Analysis: N0EOF: N0Principle Components Analysis: NEOF: NPrinciple Components Analysis: NR2EOF: NR2North TestWeightColorN0BlackN RedNR2GreenSummaryWeighting of the data can influence the result obtained from PCAScattering - QNR2Uncertain which method will yield most interesting resultsImportant implications for aerosol indirect