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Variability of Liquid Water Path in Marine Boundary Layer Clouds

Variability of Liquid Water Path in Marine Boundary Layer Clouds. C.R.Barber@Reading.ac.uk. Introduction and Motivation Climatology Model Evaluation Variability of Cloud Liquid Water Conclusions and Future Work. C.R.Barber@Reading.ac.uk. Schematic of Tropical Circulation.

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Variability of Liquid Water Path in Marine Boundary Layer Clouds

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  1. Variability of Liquid Water Path in Marine Boundary Layer Clouds C.R.Barber@Reading.ac.uk

  2. Introduction and Motivation • Climatology • Model Evaluation • Variability of Cloud Liquid Water • Conclusions and Future Work C.R.Barber@Reading.ac.uk

  3. Schematic of Tropical Circulation C.R.Barber@Reading.ac.uk

  4. C.R.Barber@Reading.ac.uk

  5. Introduction and Motivation • Climatology • Model Evaluation • Variability of Cloud Liquid Water • Conclusions and Future Work C.R.Barber@Reading.ac.uk

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  19. Conclusions Part 1 • We’ve exploited the availability of a 30-year satellite record to construct a comprehensive climatology of global regions dominated by MBL cloud • Discussed the applicability of using Lower Tropospheric Stability as an indirect measure of inversion strength and hence Cloud Fraction. • In addition to a dependence on LTS, there is an additional, weaker dependence on the absolute temperature. • The seasonal cycle in LTS is governed by the potential temperature at 700hPa in the northern hemisphere, and by SST in the Southern Hemisphere regions. • These two factors can to a certain extent explain some of the differences in interregional behaviour. C.R.Barber@Reading.ac.uk

  20. Introduction and Motivation • Climatology • Model Evaluation • Variability of Cloud Liquid Water • Conclusions and Future Work C.R.Barber@Reading.ac.uk

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  24. Introduction and Motivation • Climatology • Model Evaluation • Variability of Cloud Liquid Water • Conclusions and Future Work C.R.Barber@Reading.ac.uk

  25. Horvath and Davies, JGR, 2007 C.R.Barber@Reading.ac.uk

  26. Seethala and Horvath, JGR, 2010 C.R.Barber@Reading.ac.uk

  27. Scene Average • Simultaneous Retrievals – possible biases • Assumes Small Particle size • Poor spatial resolution relative to visible spectrum 27 C.R.Barber@Reading.ac.uk

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  49. Introduction and Motivation • Climatology • Model Evaluation • Variability of Cloud Liquid Water • Conclusions and Future Work C.R.Barber@Reading.ac.uk

  50. Conclusions • The A-Train instruments provide the opportunity to use independent collocated measurements of LWP. • LWP can be strongly influenced by the large scale atmosphere • Increased Lower Tropospheric Stability acts to decrease in-cloud LWP • This partially offsets increased CRF due to increased fraction of overcast cloud at high stabilities • Wind speed and Potential Temperature at 700 hPa are good indicators of cloud properties for overcast cloud • Large scale atmospheric factors can also have a significant impact on droplet effective radius, possibly through cloud lifetime effects • Further work is needed to establish mechanisms fort he observed results. C.R.Barber@Reading.ac.uk

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