.. _new_latest: .. _new_2026.4.3: Version 2026.4.3 (released on 3 April 2026) -------------------------------------------- This release delivers a major backend migration to Rust FFI, RSL physics refinements, a new temperature attribution module, DTS enhancements, seasonal albedo adjustments, comprehensive validation improvements, and extensive bug fixes. **Major Features:** - **Rust FFI Bridge**: Replaced f90wrap with a Rust FFI bridge as the sole simulation backend, improving build reliability and cross-platform support. (:pr:`1209`) - **Rust CLI Installation**: Unified CLI interface with automatic PATH installation for the Rust-based ``suews-run`` command. (:pr:`1215`) - **T2 Attribution Module**: Added module for diagnosing near-surface temperature, humidity, and wind speed changes by decomposing model output into physical process contributions, with diurnal cycle and heatmap visualisation helpers. (:pr:`918`) - **Dynamic RSL Coefficients**: Compute momentum and heat transfer coefficients (c2m/c2h) dynamically from Harman and Finnigan (2007, 2008) RSL theory, replacing previous static lookup. (:pr:`1116`) - **Refined RSL Parameterisation**: Explicit ``R = beta * hd / elm`` parameterisation for c2m/c2h with improved numerical stability. (:pr:`1232`) - **Seasonal Albedo Adjustment**: Added seasonal adjustment of surface albedo (``alb_id``) for vegetated surfaces based on phenology state. (:pr:`1211`) - **Auto-initialise Vegetation Albedo**: Vegetation albedo now auto-initialises from phenology state. (:pr:`1133`) - **STEBBS Profiles**: Added support for Heating setpoints, Cooling setpoints, Appliance, Occupants, and Hot Water 10-minute profiles in STEBBS. (:pr:`1038`) - **Albedo Validation**: Added ``same_albedo_wall`` and ``same_albedo_roof`` model options for roof and wall albedo consistency validation. (:pr:`1123`) **DTS Enhancements:** - Added ``chunk_day`` parameter for long DTS simulations. (:pr:`1172`) - Added ``run_dts_multi`` for multi-grid DTS simulation support. (:pr:`1173`) **Validation Improvements:** - Added draft rules registry for structured validator rule management. (:pr:`1246`) - Added conditional validation via ``_is_physics_explicitly_configured`` using Pydantic v2 ``model_fields_set``. (:pr:`1247`) - Added upper limit to ``nlayer`` to prevent run crashes. (:pr:`1206`) - Added ``SUEWSOutput`` index property. (:pr:`1178`) - Improved error message for timezone and ``startdls``/``enddls``. (:pr:`1174`) - Fixed optional ``qn_surfs`` and ``dqndt_surf`` but required in DyOHM settings. (:pr:`1189`) - Fixed biogenic parameters not required when carbon is switched off. (:pr:`1188`) - Improved error message in ``validate_albedo_ranges``. (:pr:`1193`) **Bug Fixes:** - Fixed interpolation bounds error in RSL profiles. (:pr:`1228`) - Fixed division-by-zero pitfalls in RSL/resistance chain. (:pr:`1229`) - Guarded SPARTACUS LW solver against NaN from matrix singularity. (:pr:`1212`) - Fixed SUEWS output packing overflow with fail-fast behaviour. (:pr:`1198`) - Fixed Pydantic dict format handling in YAML numeric parser. (:pr:`1236`) - Validated Rust output layout against Fortran metadata. (:pr:`1226`) - Pinned pydantic>=2.12 to prevent OSGeo4W version conflict. (:pr:`1213`) - Fixed STEBBS WWR extreme cases (``WWR = 0`` or ``WWR = 1``). (:pr:`1261`) - Fixed biogenic CO2 to use local climate instead of global average temperature. (:pr:`1117`) - Fixed missing STEBBS parameters in ``sample_config.yml``. (:pr:`1111`) - Retained ``DatetimeIndex.freq`` after concat in forcing data loading. (:pr:`1105`) - Extended nullification logic in validator for ``stebbsmethod==0``. (:pr:`1115`) - Serialised Pydantic models across multiprocessing spawn boundaries for DTS. (:pr:`1197`) - Hardened parallel multi-grid DTS execution and unified return shape. (:pr:`1176`) - Corrected DTS availability check and removed unsupported parameter. (:pr:`1187`) - Auto-repair stale refs in fetch_origin conductor. (:pr:`1239`) - Deduplicated Discourse-to-GitHub issue pipeline. (:pr:`1153`) - Fixed Sphinx and docs dependencies for Sphinx 8 compatibility. (:pr:`1159`) - Fixed missing import in orchestrator.py validator. (:pr:`1094`) - Fixed error message in pressure range check. (:pr:`1090`) - Fixed macOS UMEP wheel build by replacing sed with Python. (:pr:`1128`) **Build System and CI:** - Hardened CI and dependency supply chain after LiteLLM incident with startup hook auditing. (:pr:`1264`) - Added Rust change detection and Cargo build caching across all platforms. (:pr:`1217`, :pr:`1219`) - Gated tag-triggered deployments on master ancestry. (:pr:`1162`) - Pre-built documentation on CI, served from ``rtd`` branch. (:pr:`1167`) - Deprecated ``env.yml`` and conda/mamba build pathway. (:pr:`1163`) - UMEP build filter for compiled extension ABI changes. (:pr:`1164`) - Granular path filters and pyproject classification. (:pr:`1161`) - Added GitHub workflow skills and pre-commit quality gate. (:pr:`1160`) - Cleaned up Sphinx deps for Sphinx 8 compatibility. (:pr:`1157`) **Other Improvements:** - Bridge Discourse forum topics to GitHub issues with webhook sync. (:pr:`1138`) - Added status tags for changelog entries (governance). (:pr:`1181`) - Removed internal-only parameters from ``sample_config.yml``. (:pr:`1216`) - Cleaned up STEBBS outputs. (:pr:`1175`) - Refactored land cover fraction check to use Phase B as single authority. (:pr:`1099`) **Documentation:** - Revised README as science-first landing page. (:pr:`1265`) - Improved project branding with logo and favicon. (:pr:`1260`) - Added anthropogenic emission defaults and parameter guidance. (:pr:`1231`) - Linked community forum URLs to invite page. (:pr:`1201`) - Added user workflow guide for getting started with SUEWS. (:pr:`1014`) - Added executable documentation examples using sphinx-gallery. (:pr:`1057`) - Specified precision requirements for pressure input. (:pr:`1107`) **Breaking Changes:** - f90wrap is no longer supported; the Rust FFI bridge is the sole simulation backend. (:pr:`1209`) - Deprecated ``env.yml`` and conda/mamba build pathway. (:pr:`1163`) For complete details, see the `CHANGELOG `_.