Versions Compared

Old Version 20

changes.mady.by.user Anca Brookshaw

Saved on

compared with

New Version 21

changes.mady.by.user Eduardo Penabad

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

2.1 Atmosphere and land surface

layers: 10 (for layer depths, see table below)

Main (Physics) Time-step: 30 minutes.

“Tracer” Advection Time step: 225 seconds (1/8 of the Physics time step)

Fluid-Dynamics Time step: 56.25 seconds (1/32 of the Physics time step.
Model

CESM 1.2 - CAM 5.3 (Atmosphere)

CESM 1.2 - CLM 4.5 (Land surface)

Horizontal resolution and grid1/2° lat-lon approx
Atmosphere vertical resolution46 levels in the vertical
Land vertical resolution15 layers (see table below)
Top of atmosphere0.2 hPa (60 km approx.)
Soil layers

15


(10 soil layers plus 5 bedrock layers

Time step

)

Layer

n.

Layer depth (m)

1 (soil)

: 0.0000-0.

0279

0279m
Layer 2 (soil)

: 0.0279-0.

0623

0623m
Layer 3 (soil)

: 0.0623-0.

1189

1189m
Layer 4 (soil)

: 0.1189-0.

2122

2122m
Layer 5 (soil)

: 0.2122-0.

3661

3661m
Layer 6 (soil)

: 0.3661-0.

6198

6198m
Layer 7 (soil)

: 0.6198-1.

0380

0380m
Layer 8 (soil)

: 1.0380-1.

7276

7276m
Layer 9 (soil)

: 1.7276-2.

8646

8646m
Layer 10 (soil)

: 2.8646-4.

7392

7392m
Layer 11 (bedrock)

: 4.7392-7.

8298

8298m

12 

Layer 12  (bedrock)

: 7.8298-12.

9253

9253m

13 

Layer 13  (bedrock)

: 12.9253-21.

3265

3265m

14 

Layer 14  (bedrock)

: 21.3265-35.

1776

1776m

15 

Layer 15  (bedrock)

: 35.1776-50

.0000

.0000m 

Time step

Main (Physics) Time-step: 30 minutes.

“Tracer” Advection Time step: 225 seconds
(1/8 of the Physics time step)

Fluid-Dynamics Time step: 56.25 seconds
(1/32 of the Physics time step).


Detailed documentation:

CAM Model documentation http://www.cesm.ucar.edu/models/cesm1.2/cam/

...


HindcastForecast
Ocean initializationC-GLORS
Global Ocean 3D-VAR		C-GLORS
Global Ocean 3D-VAR
Ocean IC perturbations48
Unperturbed control forecast?NONOYES

Detailed documentation:

More details on ocean data assimilation at  http://c-glors.cmcc.it/index/index.html

...

The 10 atmospheric perturbed initial conditions, the 3 land perturbed initial conditions and the 8 (4 9 ocean initial conditions (8 perturbed plus the unperturbed, only 4 perturbed in hindcast mode) ocean perturbed initial conditions are combined to yield 240 270 (120 in hindcast mode) possible perturbed forecast system initial conditions from which 50 initial conditions (40 in hindcast mode) are chosen at random, to produce the forecast ensembleForecast Ensemble.

Detailed documentation:

CMCC technical documentation Gualdi et al (2020) CMCC Technical Note RP0288 DOI: https://doi.org/10.25424/CMCC/SPS3.5 

...