Arwen Global (Python package "arwen_global", distribution "gpuwm-global")
Copyright 2026 ArWen contributors

Licensed under the Apache License, Version 2.0. This distribution is an
independent implementation. The upstream works, datasets and services it
derives from, reads, or is verified against retain their own licences and
notices, and the ones that place an obligation on a derivative are recorded
below.

This file travels with every copy of this distribution, in the source
distribution and inside the wheel, under Apache-2.0 section 4(c).

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Relationship to the gpuwm engine

Arwen Global runs on the gpuwm engine, which it depends on rather than
vendors: physics tables, the GRIB2 source engine, the observation front
doors, the static-field builder, the NetCDF bridge, the LETKF filter core,
the wrfout writer and the product renderer are all gpuwm's, and gpuwm carries
its own NOTICE covering them. Nothing from that engine is copied into this
distribution. Reading this file is therefore not a substitute for reading
gpuwm's; both are installed together and both apply.

Two modules that were part of the engine's source tree moved here when this
package was carved out of it, because each had exactly one consumer and that
consumer is this model: the global physics registry (now
arwen_global.physics.registry) and the rows-grid helper (now
arwen_global.statics_rows). They carry the same Apache-2.0 terms they carried
there.

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WRF / NCAR / UCAR

This software is not affiliated with, endorsed by, or sponsored by the
National Center for Atmospheric Research (NCAR) or the University Corporation
for Atmospheric Research (UCAR). The Weather Research and Forecasting (WRF)
model, developed at NCAR, is the reference for the physics parameterizations
this model runs through its native adapters, and "WRF", "WPS" and "wrfout"
are used nominatively to name that reference and the file format it defined.

The parameterization schemes named in this model's configuration surface --
the Noah land-surface model, the YSU planetary boundary layer, Morrison
microphysics, Grell-Freitas and New Tiedtke convection, RRTMG and RTE+RRTMGP
radiation -- are published schemes with their own authors and their own
notices, reproduced in the gpuwm distribution that carries their code and
tables. This distribution ships none of that code and none of those tables.

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CRTM (Community Radiative Transfer Model)

The satellite radiance legs of this model are verified against the Community
Radiative Transfer Model, developed by the Joint Center for Satellite Data
Assimilation (JCSDA). CRTM is a reference this model is scored against, not
a component of it: no CRTM source, table or coefficient file is transcribed
or redistributed here. The tools that drive a CRTM installation expect the
reader to obtain it from JCSDA under its own terms.

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Test cases from the published literature

The dry dynamical-core cases this model is verified on are standard published
test problems, implemented from their published descriptions rather than from
anyone's code:

  - the Williamson et al. (1992) shallow-water test suite;
  - the Held and Suarez (1994) idealized forcing.

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Data services (not redistributed)

This software fetches data at the user's request from third-party services
and redistributes none of it. Each service carries its own terms and the user
is subject to them:

  - NOAA: the GDAS and GFS analyses and forecasts, GOES-R ABI Level 1b
    radiances, NDBC marine observations, and the IGRA2 radiosonde archive;
  - NASA and NOAA jointly: ATMS microwave radiances from the JPSS series;
  - ECMWF: the open-data global forecast set, under ECMWF's own open licence;
  - Iowa State University Environmental Mesonet: the surface station archive;
  - the WMO Information System 2 (WIS2) global brokers;
  - UCAR COSMIC: GNSS radio-occultation profiles.

The geography archive this model builds its static surface fields from is
fetched through the engine and is not part of this distribution.

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Rust components (not redistributed in this artefact)

Every data path in this software is Rust, and none of those binaries are
inside this wheel. They are built from the engine's own workspace and
delivered as release assets. Their sources, and the crates they vendor,
carry their own licences in the trees that hold them.
