Loading in 5 sec....

Perturbations of stratocumulus steady-state solutions PowerPoint Presentation

Perturbations of stratocumulus steady-state solutions

- By
**vanig** - Follow User

- 113 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about ' Perturbations of stratocumulus steady-state solutions ' - vanig

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### Seven free parameters (some of which change in a perturbed CGILS run)

### Conclusions

### Equilibrium inversion height as a function of the LTS.Mixed layer model results starting with a dry convective boundary layer

Five unknowns

Changes in atmospheric state

Sea surface temperature q0,SST

Horizontal wind velocity U

Free atmospheric moisture qFA

Free atmospheric temperature qFA

Large-scale divergence D

Property of the model

Entrainment rate we

(as a function of free parameters only)

Same can be done for qL,ML, etc., (long equations)

Total change in LWP

Total change in LWP ifonly the SST is changed

Negative feedback

Total change in LWP if the SST and qt,FA are changed

(with the same amount as qt,0)

Now a positive feedback

Change in LWP for a change in the large-scale divergence

More ls-div, thinner clouds (lower cloud tops)

Change in LWP for a change in the horizontal wind velocity

More wind, thicker clouds (BL becomes moister)

Change in LWP for a change in the entrainment efficiency A

More entrainment, thicker clouds

Effect of free parameters on the sign of the cloud feedback

higher SST , lower LWP

larger Div , lower LWP

higher U , higher LWP

qFA , both lower and higher LWP, depends on magnitude of change

higher wENT , higher LWP (* for the base state discussed here)

Entrainment rate is the only quantity that is determined by the model's parameterizations

Equilibrium inversion height as a function of the LTS.Mixed layer model results for a case with a weak large-scale cooling (net effect of radiation and horizontal advection)

inversion height ->

more stable (warmer free atmosphere) ->

Cloudy

boundary layer

free atmosphere humidity ->

Stable

boundary layer

large stability causes

went<wsubs

Clear convective

boundary layer

more stable (warmer free atmosphere) ->

CGILS: Perturb equilibrium states and investigate what happens with the LWP

Mixed Layer Model happens with the LWP

total specific humidity qT

liquid water potential temperature qL

entrainment flux

entrainment flux

zi

zb

zb

Radiative cooling

surface flux

surface flux

Download Presentation

Connecting to Server..