Semi-implicit core

The semi-implicit core couples depth-averaged transport and the free surface through an elliptic solve. The production registry name is implicit_p0_fixed; its implementation is src/neuralpom/cores/implicit_p0_fixed/.

Implementation

implicit_barotropic.py implements the free-surface operator and solve. momentum.py, tracers.py, baroclinic.py and time_loop.py supply the remaining POM integration. autograd.py, strict_vertical.py and gradient_kernels.py provide the corresponding differentiation interfaces. See Elliptic solver.

Training configuration

The portable templates configs/examples/implicit_1h.json and implicit_1day.json select the compiled vertical operator and Triton solver backend used by the registered setup. The physical runtime applies the numerical settings through v1/core_spec.py and v1/runtime.py.

Reference ensembles and calibration assets must correspond to the selected core. The production data reader uses the generation manifest and each member's provenance to identify that pairing; see Data pipeline.