Development of the Non-hydrostatic United Model for the Atmosphere (NUMA): Limited‐Area Model
Kelly, James F.
Giraldo, Francis X.
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Numerical weather prediction at high‐resolution (~10 km) requires a nonhydrostatic dynamical core (e.g. compressible Euler equations). Ideally, the same core should be used for both limited‐area (Lokal Modell, WRF, COAMPS) and global prediction (UK Met Office, NOGAPS). • Spectral Elements (SE) have many benefits : 1) higher‐order accuracy, 2) flexibility with unstructured/adaptive grids and 3) efficiency on large parallel computers (Giraldo and Rosmond 2004, Taylor et. al. 1997). • Due to fast acoustic waves in the compressible Euler equations, explicit time‐stepping is not efficient. • Therefore, we have developed a 3D SE non‐hydrostatic dynamical core with semi‐implicit 4me‐stepping. The current implementation is targeted toward distributed memory architectures (clusters).