Please notify us if you are participating in the case and we will supply you with the lastest updates to the case. Please email dobbie@env.leeds.ac.uk if you download the data.

Setup details and requested diagnostics

The specifics of the inter-comparison case setup and the requested diagnostics are specified on the link below. This will explain the model simulation setup and what we expect from you in terms of diagnostics. The diagnostics are listed as L1, L2, and L3. We hope that participants will at the minimum supply L1 and we expect that L2 will also be supplied, as it will faciliated better comparisons to remote sensing observations. Please suppply L3 to make possible detailed comparisons. Click here for case setup details

Download data

We request that participants do a single simulation run at this stage. After the first analysis in June-July, we may suggest further sensitivity runs.

Below are the datafiles to be downloaded to run the case. We have provided two sets of initialisation data. One with 91 vertical resolution and a higher resolution of 191. For the LEM simulations we performed, we used the 91 level initialisation. For models unable to set their vertical resolution, we provide a high resolution initialization. Please try to use the 91 level data if possible.

The gravity wave (GW) and radiative heating rate (solar and IR) are applied as a forcing in the simulation. The GW data is provided in two columns, the first is time and the second is the GW forcing in m/s. There is one value of GW forcing at each time and it is to be applied to the whole atmosphere at that time. The radiative heating rate is provided with a vertical profile for each 5 min. So the first 91 values (surface value first,..., TOA last) is the radiative heating (K/day) at t=0, the next 91 values are for t=5min, and so on.

91 level initialisation (we used in our LEM simulations) -- Recommended

Height (m)	data
Pressure (mb)	data
Potential temperature* (K)	data
Horizontal wind (m/s)	data
Water vapor mixing ratio (kg/kg)	data
Time (s) vs Gravity wave (forcing) (m/s)	data
Heating rate (forcing) (K/day) listed every 5 mins	data

* Note: this profile produces approximately a small supersaturation with respect to ice for the peak value of inital water vapour according to our formula (modified Tetan's formula). If you are using a different formula then you may have to modify the water vapour profile to obtain the same 10% supersaturation. Contact us if you need assistance.

Note: To calculate the temperature from the potential temperature, we use a reference pressure of 1019.3844 mb.

Note: the heating rate has been tapered to 0 above 14 km.

191 level initialisation -- provided for models without control over their vertical resolution

Height (m)	data
Pressure (mb)	data	plot
Potential temperature (K)	data	plot
Horizontal wind (m/s)	data	plot
Water vapor mixing ratio (kg/kg)	data	plot
Time (s) vs. Gravity wave (forcing) (m/s)	data	plot
Heating rate (forcing) (K/day) listed every 5 mins	data	plots

Data format and requested diagnositics

• See the following page for data formats and requested diagnostics: Setup and requested diagnostics

· Note: This case has been developed for exclusive use of the GCSS WG2 inter-comparison.