Vort3D model

A minimal 3D tropical cyclone model following Zhu, Smith & Ulrich (2001): sigma-coordinate primitive equations on an f/beta-plane, with nz free-atmosphere layers plus one boundary layer at the bottom, surface fluxes, radiative cooling, explicit condensation, and a convective closure (the paper’s own ooyama scheme, or a simplified betts_miller column relaxation for nz other than 2).

The prognostic state is wind (\(u,v\)), potential temperature (\(\theta\)), and moisture (\(q\)) on all nz + 1 layers, plus a single-level surface pressure field (\(p^*\), column mass). Vortex position, intensity, and size, the background steering flow, and the reference Coriolis parameter f0 are all configurable, making it a lightweight testbed for ensemble DA experiments involving vortex tracking and position error.

See NEDAS.models.vort3d package for the model interface and NEDAS.datasets.vort3d package for the corresponding synthetic observation dataset. Default parameters are documented in NEDAS/models/vort3d/default.yml.

Note

No step-by-step tutorial notebook is available yet for this model (unlike vort2d, qg, and nextsimdg above).