January 2026 monthly summary for E3SM/EAMxx in the E3SM repository. The team delivered substantive feature work, core bug fixes, and infrastructure improvements that enhance decomposition flexibility, data handling accuracy, grid geometry support, and test reliability. The work focused on business value through improved simulation fidelity, reduced overhead and contention, and stronger maintainability and automation. Key results include: Scorpio interface extended to support arbitrary 2+ dimensional decompositions with associated cleanup; DataInterpolation enhanced with nearest-point time interpolation to accommodate non-uniform time stepping; substantial grid/geometry enhancements for point grids (GID base control), geometry file IO, and remap handling; expanded testing and validation with lat-lon output tests and extended eamxx-prod test coverage; and multiple maintenance and configuration improvements to reduce risk and streamline CI/build processes.

December 2025 monthly summary for the E3SM repository (E3SM-Project/E3SM) focusing on delivering business value, stabilizing core physics, and improving testability and maintainability across the codebase. Key outcomes reflect substantial modernization of cloud and atmosphere components (EAMxx), targeted fixes to core math and proc utilities (Hommexx), and cross-cutting improvements in constants handling, documentation, and build hygiene. The period emphasizes measurable impact on correctness, portability, and developer productivity, with a strong emphasis on unit tests, emulator workflows, and clear documentation to reduce future integration risk.

Monthly summary for 2025-11 focused on E3SM/EAMxx work. Delivered a major API cleanup/refactor of the EAMxx API, added test coverage, and implemented stability improvements that reduce build failures and improve maintainability. Key contributions were in API simplification, DP test integration, and targeted bug fixes across the EAMxx code path.

October 2025 (Month: 2025-10) performance highlights for the E3SM repository, focused on stabilizing the build/test surface, modularizing core physics code, and aligning data/IO components with the new library layout. The work strengthens CI reliability, accelerates baseline generation, and delivers tangible business value by reducing build failures and enabling faster iteration on physics and test development.

September 2025 performance summary for E3SM (EAMxx, EKAT, HOMME, and related components). The month focused on delivering modular, high-value features, stabilizing the codebase, and laying groundwork for faster, more reliable builds and diagnostics. Key business-value outcomes include reduced maintenance burden through library/folder restructuring, improved data organization for grid and field utilities, and stronger CI quality gates.

August 2025 (2025-08) focused on increasing debuggability, stability, configurability, and testing coverage for EAMxx within E3SM, delivering business value through faster triage, more reliable simulations, and stronger CI automation. Notable outcomes include enhanced error reporting for PySession::safe_import failures, stabilization of IO storage handling and related tests for daily/monthly/yearly outputs, configurable atmosphere namelist handling, expanded cld_frac/clf_fraction test coverage with a PyTorch ML emulator test, and CI/workflow improvements for artifact uploads and selective runs. These efforts reduce production risk, shorten feedback cycles, and provide a robust foundation for future experiments.

July 2025 monthly summary for E3SM and mam4xx contributions. Key features were delivered, IO was modernized, and remapping configurations were stabilized to improve reliability and readiness for upcoming EKAT and EAMxx evolutions. In E3SM/EAMxx, DataInterpolation API and usage enhancements were implemented, introducing new accessors and support for non-standard dimension names, with a sequence of commits focusing on API correctness and usability. Remapper design and setup improvements refined vertical remapping configuration and related plumbing, reducing unnecessary forcing of pack-compatibility and improving configuration workflows. EKAT IO migration to standard C++ streams modernized the IO path and decoupled from legacy EKAT file utilities. Additional enhancements included Rank-5 field support in print_field_hyperslab, and ongoing adaptations to the new EKAT and Python hooks to strengthen scripting and testing. On the reliability and quality front, model restart tests were improved, subview information in the PD remapper was kept consistent, multiple IO/test fixes were applied, and submodule updates to Haero and mam4xx were aligned with newer dependencies. Overall, these changes improve robustness, enable higher-fidelity remapping, simplify IO paths, and strengthen testing coverage, positioning the project for future EKAT and EAMxx iterations.

June 2025 monthly summary for E3SM EAMxx improvements: delivered foundational Python integration groundwork, reinforced restart and IO robustness for radiation workflows, and advanced code quality and build optimization across the EAMxx subsystem. These efforts enable Python-based atmospheric processing, improve restart consistency and diagnostic accuracy, and enhance maintainability and CI/testing coverage to accelerate experimentation and deployment.

May 2025 monthly summary for performance review. Overview: Delivered a suite of feature improvements, refactors, and stability fixes across the E3SM EAMxx codebase, with targeted maintenance and modernization work in Mam4xx. Focused on delivering business value through reliability, performance-oriented refactors, and clearer runtime behavior, enabling faster development cycles and more predictable production runs. Key features delivered and major fixes: - Remapper registration cleanup in E3SM: upgraded remappers and removed registration_begins usage to reduce complexity and improve maintainability. Commits included 0a7975972988410c9f17298cd3baf41e7785c245 and 6ba2f94cf679eec35bb2145a77474f44655cefcf. - FieldManager refactor and unit tests: removed registration_begins and adjusted creation semantics (Closed), with tests updated to reflect new lifecycle. Commits 162370d10e8d113a3fb4db3c174d9028096ca1bd and d41eb74593ea00002d71c528dacdce95c4200c95. - IOP process naming alignment: fixed inconsistency to ensure iop process name matches ATM proc factory registration. Commit 4be45344f0ad3f21737c9147050097cb0cecbbee. - Rad/COsp runtime behavior and restart data: revised rad/cosp supercycling logic; added rad_heating_pdel to restart files; removed build-nml consistency check for frequency. Commits 50974d7b822d38b4200d886dc884c40965a0809e, c36e5f8192f3c6fb99c2c978a74bd27f36896153, f67e080d7180cbe10ab507cd8856eb2b86884357. - Driver top-run message improvements: clarified top-of-run messages for better observability. Commits d530f6fbbdd9cc378dbda7cb7b964094510e253a and 99ae7dcb19a65aed5fc44a994574e76a421a1cd5. - Horizontal remap fixes and tests: fixed horizontal remap bug, added micro-optimizations in remapper data setup, and introduced unit test for sampling-like horizontal remap. Commits fac606e6954faa34a0a5bf4be0cb4a30069d22da, e20a7477299dc2819936c6de4a33ca354ce732b9, 3bf0271013463c668d887ce62ec4e41c0b442168. - Compiler warnings/diagnostics fixes: resolved warnings in Homme F90 interface and precip flux diagnostic. Commits cce9ce7fb75851f50121b0aaa5400e7c8287f229 and 85462fd5199ab41e721a1b0d6971e7f25183681b. - Core API and runtime improvements: replaced ExecSpaceUtils with TeamPolicyFactory/ReductionUtils; updated scalar traits; improved includes for genRandArray; session handling changes; added missing timestamp init for rad heating. Commits 28d7a6e642dddb7d41fcb27637888503baa86d9e, 72cc74fc294bde90a9de2057f697162111364824, a5f3b6eb91aa0951e750a3d1c890fc1803686e16, dab0514c64b2318a1b7432f36f7a2994ac43aaae, d20aa690ab8269d22b86178a9942d7955022228c. - Build/test hygiene and reliability: improved build cleanliness by avoiding test-only code in regular libs, fixed standalone tests, unit test for radiation_do, and lint fixes in build scripts. Commits 5343874f1395fe3a6cfeb872dfde3086014a9fbb, 69bc29a70068d5869742061f8462707bb40f2233, 174eec0f6965e29da9ce89474d4959783307c307, 2819884c66117baf2d229de8630f096c22192661, 2dc444d7c3dd2df3b0794922eb2ae821be8cfcc1. - Maintenance and configuration updates: updated ekat submodule, PAM configuration, python CMake var handling, and packaging for p3 standalone executable. Commits a85ce562e0cc294a3b8da94f0cdb68461aa8a0df, d9d485a973196b265fa135d5c02d01dd022b15ec, 82d3fdf6021fd191c3fb895af4d2349561b107e4, e19c5a28f0ec0188003e79766b465be1127c282c. - Other improvements and fixes: improved error messaging for HorizRemapperData; fixed GID index base and SP build diagnostics; switched to std::any and std shared_from_this; refactored Scorpio output; added inline docs for output class; and numerous IO/diagnostic robustness and metadata fixes in EAMxx. Key commits include 210f040bedbe919f51e141ead201b92107396f6b, a5f83d4ca70632754fe6cb7ab47d1a1f1291d8a0, eb426707eacf151c2990642d43bb96ec906968d5, 1adf4412325dd84f26be7d5b074f4bdb41c28303, 1a426a526a545b02c0b782d4d46c22cc750a09b9, 19009255ab5b6bfbe55a06f3284c993d46f0a01d, ec904f3d781756826e6e2d2f1516aef775d5d789, 666ebf530aee4947d85e605a99aa5fec8d5a716c, 0a2b7ff8236d8511c686e760fe362946aaa68fde, 7544c443cc996e1a8d538f65410897f4b04d2a58, 4cffb23504f08dbddfb6eaa6bbb6cd800d39d202, 21227cae4a6e73077dc57a6a22110e7009d82dcc, e62a291b2a1751aba78c28f2633d8c3c7c3baec5, 21a9da9c7ab8c7ecdce930fa06c67e726825b5aa, 755d1cd39b35c884279f6d4d448e1a1ad73c9c6a, b3878ab92dba12764c402bb96c2cc30c665eaf71, 4b34051594e60e15d920cf54f6a4268429806b1b, 8869a6e44bbdbb3847a68231843416febc4f15fe, ed4b493187d60ae995d725e253c2c1bda69eeed5 - Mam4xx header inclusion refactor: code maintenance improvement in mam4xx, refactoring ekat header inclusion for clarity and future development. Commit 181fbaab93c3dd506fb870059f58db11fa4ebe87.

April 2025 monthly summary focused on delivering robust build and runtime improvements, strengthening data handling correctness, expanding test automation, and enhancing configurability. Key business value stems from more reliable cross-platform builds, improved stability of simulation workflows, and accelerated regression testing.

March 2025 performance highlights for E3SM project. Delivered end-to-end EAMxx v1 workflow enhancements, strengthened hash-based provenance, expanded Scorpio interface capabilities, and improved logging/observability and stability across the EAMxx code path. These efforts increase reproducibility, CI artifact quality, portability, and developer productivity while delivering concrete business value.

February 2025 monthly summary for E3SM/EAMxx development. Delivered API enhancements and stability improvements across EAMxx, GridI/O, and diagnostics, with a focus on business value, traceability, and scalable performance. Implemented extended field operations and safe field manipulation, improved grid management with lazy initialization, decoupled MPI-dependent code paths, and strengthened CI/testing for robust production runs. Also advanced data handling and IO robustness, including standardized diagnostic naming, clearer time/unlimited dimension handling, and robust DataInterpolation support.

January 2025 monthly summary for E3SM development. This month focused on delivering high-value features, stabilizing CI, and improving data remapping capabilities. Key contributions span automated testing baselines, time handling reliability, and remapping infrastructure, with strong emphasis on business value and scientific workflow reliability.

December 2024: Delivered core EAMxx enhancements, stability improvements, and migration activities across E3SM and SCREAM. Notable features include a grids manager and diagnostics refactor with YAML inspection, a new TimeInterval struct plus QoL methods for TimeStamp, and metadata utilities consolidated to shared/util with an updated EKAT submodule. DataInterpolation received extrapolation support for vremap, expanded test coverage, and a p1d read fix, complemented by improvements in remappers. Maintenance and quality efforts included compiler warnings and valgrind cleanups (including pack size 1 adjustments and test fixes), plus CI/workflow improvements (MMF testing in the eamxx v1 workflow and config cleanup). The SCREAM repository was retired and its development migrated to the E3SM repository with updated READMEs. Overall this period increased modularity, debugging visibility, testing coverage, and reliability of configurations, delivering tangible business value through faster iteration, robust models, and smoother migrations.

November 2024 monthly development summary focusing on EAMxx, CI/CD automation, and data interpolation capabilities. Delivered expanded EAMxx testing/workflows, hardened workflow skip/execute logic, updated CI/Mergify configurations, aligned EAMxx with Ekat updates, and introduced a data interpolation class with tests, driving higher release quality, faster baseline generation, and more reliable validation.

Month: 2024-10 | Repository: E3SM-Project/E3SM Key features delivered: - Enable branch run type in EAMxx: adds support for branch-based run type in EAMxx. (commit 3422a999eda3bc16f1ac68e75ece95bb7f99e502) - Propagate run_type to OM setup in EAMxx: propagates run_type into OM setup for consistency. (commit 82a85c84b94b00909912b8ef328965cf8d89c51d) - Simplify TraceGasesWorkaround struct: reduces complexity of TraceGasesWorkaround struct. (commit 25d940b28fc0cfb95243dd18c91f3a1863bc9e76) - Update output specs for MAM tests (EAMxx): updates output specs for MAM tests. (commit 88b1da8fddbfb8ab07d06700dbd0136c4c3aacdd) - Add support for ghci-snl-cuda in standalone testing: enables CUDA support in standalone testing for ghci-snl. (commit 6dc8af9e4bc72e1af3a051b70cc5a6aa858a5921) - Workflow: run script tests on ghci-snl-cpu: adds a workflow to run script tests on ghci-snl-cpu. (commit cff9601368929a82a1931eb38f3a483f32d4d41d) - Shorten eamxx job names in workflows: shortens EAMxx job names in workflows. (commit 77bbccb03ff2323dbb737f4b61ea2b30f5aff301) Major bugs fixed: - Fix compilation errors in MCT interface (EAMxx): fixes compilation errors in the MCT interface. (commit e1467c60bd86bd1da96e0f8dfe7aa6f47fe2d4f2) - Fix init_timestep logic in OM (EAMxx): corrects initialization timestep logic in the OM. (commit acbaa6c3e7aa8d89b7389c13dc5f86c9cb7dd893) - Fix a couple of warnings (EAMxx): suppresses or fixes several compiler warnings. (commit 6f3afbb486948ef66a7c18afc049a9645ea3711f) - Remove namelist param for restart casename (EAMxx): removes the namelist parameter from the restart casename flow. (commit 6fa67eb586d0f4eca1d90f869d8ea0adff3513ca) - Don’t skip layer when using add_subdirectory (EAMxx): do not skip layer when building via add_subdirectory. (commit 30b87a90a06436dfca38b239ebcfd08ff78af48f) - Fix eamxx testing path filtering in workflows (Workflows): corrects path filtering logic for eamxx testing in workflows. (commit 6c48c8556038cca4134ea05b1efd00dfb4939f3e) - Fix scream-env-cmd (EAMxx): fixes the scream-env-cmd invocation or behavior. (commit 5547914ce6103d281cd7b83ba4f01e47f8472c89) - Disable CUDA-aware MPI in ghci-snl-cuda (EAMxx): disables CUDA-aware MPI in the ghci-snl-cuda module. (commit 3724d459ddd94694a35c359aa07001e00ac24ea7) Overall impact and accomplishments: - Hardened CI/CD pipelines and improved reliability of EAMxx builds and tests, enabling broader hardware coverage (ghci-snl-cpu and ghci-snl-cuda) and nightly/SA workflows. - Accelerated branch-based experimentation and ensured run_type consistency across EAMxx and OM setups. - Codebase maintainability improved via refactors (TraceGasesWorkaround, machine_specs) and cleanup (removing semi-unused util). Technologies/skills demonstrated: - Fortran/C++ code changes in EAMxx, MCT interface, and OM initialization. - CI/CD optimization: GitHub Actions workflows, composite actions, early repo checkout, concurrency management, and workflow scripting. - Cross-machine testing strategies and automation for CPU/GPU environments. Business value: - Faster, more reliable experimentation cycles with consistent run configurations. - Improved stability and maintainability of the EAMxx pipeline, enabling safer deployment and broader testing across hardware platforms.