Symposium

Symposium

(University of Belgrade)

"Scale separation challenge for convective scale data assimilation in the presence of convection"

This study investigates scale-dependent sensitivity of three-dimensional (3D) state of convection to coincident atmospheric environment within local meso-gamma scale neighborhoods using a 4500-member ensemble of cloud-resolving model simulations. It is shown that variability of the 3D vertical velocity and total condensate at the convective scales is nearly insensitive to variability of the near-neighborhood atmospheric state environment at horizontal scale of about 26 km.

In contrast, the total condensate at the neighborhood scale and the vertical velocity at the convective scales exhibit notable co-variability with the environment state variables at the convective scales. These findings point to scale separation problems for convective-scale data assimilation and a need for convective-scale specific background uncertainty representation to combat lack of observational constraint of the thermodynamic states at these scales.

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