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Understanding Observed Stratocumulus Variability and Implications for Aerosol Indirect Effects

Understanding Observed Stratocumulus Variability and Implications for Aerosol Indirect Effects. Nathan Johnson. Outline. Effects of aerosols on Climate Susceptibility Observations of Microphysical Quantities MArine Stratocumulus Experiment Principle Components Analysis. Introduction.

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Understanding Observed Stratocumulus Variability and Implications for Aerosol Indirect Effects

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  1. Understanding Observed Stratocumulus Variability and Implications for Aerosol Indirect Effects Nathan Johnson

  2. Outline • Effects of aerosols on Climate • Susceptibility • Observations of Microphysical Quantities • MArine Stratocumulus Experiment • Principle Components Analysis

  3. Introduction • Indirect Effects of Aerosols on Climate • Twomey / Albrecht / Dispersion

  4. Observational 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)

  5. N L k MASE

  6. Data Description

  7. Principle Components Analysis % Variance Explained by Mode: 1 2 3 CDNC 0.746 0.226 0.028 LWC 0.879 0.001 0.120 k 0.767 0.191 0.042

  8. Principle Components Analysis: N0

  9. EOF: N0

  10. Principle Components Analysis: N

  11. EOF: N

  12. Principle Components Analysis: NR2

  13. EOF: NR2

  14. North Test

  15. Summary • 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 effects

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