A short course on cloud feedbacks and cloud dynamics

8/10/2019 A short course on cloud feedbacks and cloud dynamics

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?xercise @ rap upModel setup%0ir parcel model' no exchange o, heat' moisture'


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p g ,particles ith en ironment1 Constant ertical indspeed (cooling rate) cooling' condensation1

?xplicit calculation o, microphysics'resol ed si#e spectra1

8nitial temperature'pressure' humidity'aerosol particlespectrum prescribed

W

, p, 6v,aerosols

Model used%Simmel et al1' :44;

Sensiti ity o, pro,iles to erticalind speed>iquid ater pro,iles


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Close-up

q p


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Sensiti ity o, pro,iles to erticalind speedumber density pro,iles


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Model setup/numerics (modelgoes nuts here)

Sensiti ity o, spectra at end o,simulation to ertical ind speed

umerical stu,,'you ould normally

article number spectra


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you ould normallynot plot numberdensities this small111

Why the model goes nuts111


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Constant ertical ind speed cooling goes on' super-saturation cannot e,,ecti ely be remo ed anymoreo sedimentation particles are not remo ed butkeep gro ing collision and breakup o erly acti e

Why the model goes nuts111


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(0nimation)

0dditionals8ncreasing aerosol number leads to acti ation o, more


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particles at a gi en supersaturation concurrentgro th' smaller drops' e entually no precipitation peak,orming because coalescence is not e,,ecti e ,or toosmall drops

Smaller ,raction o, soluble material corresponds toha ing smaller particles' hich acti ate at higher super-saturation ,e er but larger dropsChanging bet een sea salt and ammonium sulphatealters the acti ity coe,,icient in the B hler equation15hat coe,,icient is hard-coded in the model1

>iterature ruppacher' 9161 and Blett' F1 1' 3


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0cademic ublishers1 ( ery detailed' goes deep into theory) 6ogers' 6161 and Pau' M1B1' 3iterature oms' !1' et al1' :4331

0 escription o, the onhydrostatic 6egional Model >M art 88%
http://www.cosmo-model.org/


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hysical arameteri#ation1 0 ailable at http%// 1cosmo-model1org 1(still being updated' nice and easy to read introduction to C.SM.Us3-moment bulk schemes plus background in,ormation)

Bhain' 01 1' et al1 :4441otes on the state-o,-the-art numerical modeling o, cloud micro-physics1 0tmos1 6es1 ;;' 3;

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A short course on cloud feedbacks and cloud dynamics