Suite configuration

Suite configuration#

The private repository https://github.com/21centuryweather/access-am3-configs includes two branches to run a low (n96) and a high (n512) resolution:

  • dev-n512-aeroclim

  • dev-n96e-aeroclim

The main differences with the alpha release version, it that this configuration runs with climatological aerosols.

Initial conditions#

Both suites are prepared to run with n96 restarts. In the case of n512 the reconfiguration step will interpolate all the necessary variables.

Also, both suite include a fix_cable_restart step to populate cable variables after the reconfiguration. While this is not necessary for n96, is included to match the configuration of the high resolution branch.

Restart files: available for every January from 1983 to 2009 at /g/data/gb02/public/AM3/restartdumps/n96e.

To change the restart used edit the file site/nci_gadi.rc:

{% set AINITIAL = '/path/to/restart/deva.da20070101_00' %}

Ancilliaries#

Ancillaries for n96 and n512 where generated using the suite u-dj813 (copy in /g/data/gb02/public/AM3/ancils/u-dj813_om3-025deg/).

Manual fixes:

  • Veg frac. For n512 it requires a manual fix to normalize values and remove NAs.

Optimization#

The IO Server was activated for both suites.

Resolution

NPROCX

NPROCY

IO

Threads

Processors

nodes

IO_tasks

n512

32

32

80

2

2208

46

8

n96

24

24

48

2

1248

26

4

Output variables#

The variables saved are listed here. The different groups of variables or “Packages” can be activated/deactivated from the gui.

Currently the COPS, 2D Extra and 3D Extra packages are not active because they haven’t been fully tested. They can be activated from the GUI in UM/namelist/Model Input and Output/STASH Request and Profiles/STASH request (upper right corner drop-down menu).

Things to consider when activating these packages:

  • Output streams (pp9 and pp10) may require more headers to allocate all the variables.

  • If field files are to big (more than 100gb) the netcdf conversion will probably fail. My recommendation is to switch from monthly output to daily (to create 30 small files instead of a big one). This is done also in the pp configuration.

  • To save some space we may want to deactivate the 3D ERA5 Diagnostics package to save some space.

Resources#

Resources per simulated month with the current configuration and output

Resolution

KSU

Wall time

Output (netcdf)

n96

0.462

00:11:05

8.8 GB

n512

11.7

02:40:00

226 GB