Bubble Configuration#

Input dependencies:

(for Levante)

root = /pool/data/ICON/grids/public/mpim

# Grid (any torus grid works)
$root/Torus_Triangles_20x4_5000m/Torus_Triangles_20x4_5000m.nc  # (Example)
Compatible machines and compilers:

Levante CPU, MacOS

Recommended resources:

Single Processor.

Estimated runtime (for resources indicated above):

Tens of seconds

Scripting:

Bubble mkexp config (note the initialization is performed here, using default parameter settings, which, along with model parameters, can be modified within Namelists) (add your slurm account ACCOUNT in the mkexp script to run in Levante).

Analysis/postprocessing:

Checkout the examples on easyGEMS.

Description#

The basic set-up of the bubble experiment consists of an atmosphere over a bi-periodic domain. A roughly 20 km deep atmosphere is discretized over 70 layers and initialized to form two uniformally stratified layers upon which a perturbation is imposed. The first layer extending upwards with a temperature profile given by

\[T(z) = T_0 + z\Gamma_0\]

to a height z_0 above which the temperature follows the profile

\[T(z) = T(z_0) + (z-z_0)\Gamma_1\]

where T_0, z_0, Gamma_0, and Gamma_1 are parameters that can be specified. The humidity is set to a constant prescribed value. The perturbation, or “bubble”, is specified as a latitudinally slab symmetric gaussian perturbation in relative humidity and temperature that is centered at the surface and the central longitude. The surface is given the properties of saturated water at a fixed temperature, and the mean wind is initialized to 0 m/s. In terms of the physical set up, it is often most useful to vary T_0 (aes_bubble_config%t0 which is set in aes_bubble_nml) and the surface temperature (ape_sst_val which is set in nh_testcase_nml) as this determines the phase of the condensate that forms in the bubble.

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