Cirrus microphysical and radiative properties

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Presentation transcript:

Cirrus microphysical and radiative properties Steven Dobbie

Progression: Radiative Transfer Optical Properties GCM Modelling Cloud Modelling

Importance of cirrus: - Albedo effect (iris effect) - Radiation-convection feedback - Precipitation - Indirect effects

Research developments: Sat Ghosh Radiative properties of inhom cirrus (CWVC) (May ’03). John Marsham Shear effects on cirrus clouds (EMERALD) (April ‘03). Adrian Hill Semi-direct/indirect effects bin resolved LES (warm) (Oct ‘02). Clare Allen Iris effect of cirrus on climate (Oct ‘03). Gourihar Kulkarni Aerosol mixtures. Environmental Chamber (Oct ‘03).

Collaborations: - Laki eruption - Highwood (Reading) - Stevenson (Edinburgh) - Contrails (FP6) - Mannstein (DLR)

UK LES modelling

(z,t)/z + (/Tv) ((z,t)/z) t < 0 (z,t)/z Radiation and latent stability numbers (z,t)/z + (/Tv) ((z,t)/z) t < 0 (z,t)/z Rsn = ------------------------- (/Tv) ((z,t)/z) t For Radiative Instability 0 < Rsn < 1

Modelling cirrus: - Driving mechanisms - Microphysics - Aerosol influences - Sub-grid variability - Radiative properties - Climate feedback mechanisms

Sub-grid cloud inhomogeneity GCM Grid cell 40-400km