Socrates 26.03

Full Changelog: git_migration...2026.03.1

---

Points of note

• Radiation code used by LFRic Apps version 3.1 and the Unified Model version 14.1.
• Updated Total Internal Partition Sums for HITRAN2024: #14
• Fixed python script to generate .view file and other small fixes: #19

Known Issues

• None

Socrates 25.11

Full Changelog: apps2.2...git_migration

---

Points of note

• Last release from the FCM (subversion) repository prior to the move to github.
• Radiation code used by the Unified Model version 14.0 and LFRic Apps version 3.0.
• Functionality to use new format MT_CKD water vapour continuum data as included in HITRAN: #190
• Functionality to use temperature-only look-up tables for gas absorption: #188
• New prototype chemistry code: #165
• New prototype two-stream driver using LFRic diagnostic fields as input: #160
• All ksh scripts have been converted to bash: #193

Known Issues

• None

Socrates 25.07

Full Changelog: apps2.1...apps2.2

---

Points of note

• Radiation code used by the Unified Model version 13.9 and LFRic Apps version 2.2.
• Minor release with some fixes required for the LFRic interface, notably: #185
• Build configuration for Met Office Azure SPICE system available: #179

Known Issues

• The examples/aerosols test does not have a matching KGO for the azure_gfortran12_debug build configuration: #189

Socrates 25.03

Full Changelog: um13.7...apps2.1

---

Points of note

• Radiation code used by LFRic Apps version 2.1 and the Unified Model version 13.8.
• A change is made to the way mixed phase cloud is split into ice and liquid fractions for the LFRic interface, significantly affecting downward SW flux over the Arctic: #177
• Additional functionality and diagnostics included in the LFRic interface routines: #167, #175, #176

Known Issues

• None

Socrates 24.11

Full Changelog: um13.6...um13.7

---

Points of note

• Radiation code used by the Unified Model version 13.7 and LFRic Apps version 1.2.
• Minor update with a couple of important bug-fixes to non-core applications used by LFRic.
• The technical guide has been updated with a new section on the Stellar Illumination code.
• The user guide has been updated with a new section on Calculating Horizon Angles for LFRic.

Known Issues

• None

Socrates 24.07

Full Changelog: um13.5...um13.6

---

Points of note

• Radiation code used by the Unified Model version 13.6 and LFRic Apps version 1.1.
• A relatively major update including functionality changes in the core radiative transfer routines and pre-processing programs.
• The original equivalent extinction code has been removed in favour of the more flexible updated routines (maintaining physical, but not numerical consistency for older configurations): #161
• This change also corrected some errors introduced with #147 that may have caused problems with the exact major overlap method for treating overlap of gas absorption: #161
• Functionality improvements for the calculation of photolysis rates: #155, #162
• Introduction of a new utility to calculate horizon angles on the LFRic UGRID for inclusion in orography ancillary files: #146

Known Issues

• None

Socrates 24.03

Full Changelog: um13.4...um13.5

---

Points of note

• Radiation code used by the Unified Model version 13.5 and LFRic Apps version 1.0.
• Minor updates and bugfixes.

Known Issues

• None

Socrates 23.11

Full Changelog: um13.3...um13.4

---

Points of note

• Radiation code used by the Unified Model version 13.4.
• The core radiative transfer routines have been wrapped in modules for this release: #148
• The build_code script has been modified to allow bespoke programming environments to be set up. Within the Met Office, environments for ifort 19 and gfortran 11 are now available: #150

Known Issues

• None

Socrates 23.06

Full Changelog: um13.2...um13.3

---

Points of note

• Radiation code used by the Unified Model version 13.3.
• Enhanced functionality for generation of correlated-k coefficients, including updates for the latest HITRAN database: #103
• Inclusion of the COSP2 code for LFRic builds (this is likely to be temporary until COSP can be built directly from github): #131

Known Issues

• None

Socrates 23.04

Full Changelog: um13.1...um13.2

---

Points of note

• Radiation code used by the Unified Model version 13.2.
• Updates to the interface routines for LFRic: #130, #134, #137.
• Pre-processing directives have (again) been removed from the code: #123.

Known Issues

• None