E3SM-Project/E3SM
Apr 2024 – Apr 2026
13 Months active
Languages Used
FortranPerlXMLPythonShell
Technical Skills
Fortran programmingnumerical modelingocean modelingoceanographyscientific computingconfiguration management
Carolyn Begeman
PROFILE
Carolyn Begeman
Contributed to the E3SM-Project/E3SM repository by developing and refining features for ocean and climate modeling, with a focus on freshwater tracer integration, land-ice draft diagnostics, and latitude-dependent diffusivity. Leveraged Fortran and Python to implement configurable simulation components, enhance numerical stability, and improve model realism for high-latitude and polar scenarios. Applied configuration management and scientific computing skills to streamline build systems, strengthen test automation, and ensure reproducibility across diverse mesh types. Addressed code maintainability through targeted refactoring and documentation updates, while integrating new diagnostics and validation checks to support robust, production-scale climate simulations and facilitate ongoing model development.
Overall Statistics
Feature vs Bugs
84%Features
Repository Contributions
52Total
Bugs
4
Commits
52
Features
21
Lines of code
1,952
Activity Months13
Your Network
175 peopleShared Repositories
108
Abhishek BagusettyMember
Erin ThomasMember
Erin ThomasMember
Oscar Diaz-IbarraMember
Andrew RobertsMember
Andrew RobertsMember
Alexander HagerMember
Andrew M. BradleyMember
Andrew M. BradleyMember
Work History
April 2026
3 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for E3SM development (repo: E3SM-Project/E3SM). Focused on delivering robust SORRM mesh configuration upgrades to enhance ocean and sea-ice simulation accuracy and performance. No explicit bug fixes documented for this period; main work centered on feature delivery that improves realism, stability, and computational efficiency.
3 Commits • 1 Features
Apr 1, 2026April 2026 monthly summary for E3SM development (repo: E3SM-Project/E3SM). Focused on delivering robust SORRM mesh configuration upgrades to enhance ocean and sea-ice simulation accuracy and performance. No explicit bug fixes documented for this period; main work centered on feature delivery that improves realism, stability, and computational efficiency.
April 2026
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026: Strengthened testing coverage for the latitude-dependent background diffusivity feature in E3SM. The core deliverable was a stealth test added to the testing framework to validate the feature across latitudinal variations, accompanied by a commit that records the work: 70663a547ba80711c9ab77870f292814f55343a6 (Add stealth test for latitude-dependent diffusivity). No major bugs fixed were documented in this period. Impact: improved test coverage and CI reliability, enabling earlier regression detection and more robust feature readiness. Technologies/skills demonstrated: testing framework enhancements, Git-based traceability, stealth testing approach, and CI integration readiness.
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026: Strengthened testing coverage for the latitude-dependent background diffusivity feature in E3SM. The core deliverable was a stealth test added to the testing framework to validate the feature across latitudinal variations, accompanied by a commit that records the work: 70663a547ba80711c9ab77870f292814f55343a6 (Add stealth test for latitude-dependent diffusivity). No major bugs fixed were documented in this period. Impact: improved test coverage and CI reliability, enabling earlier regression detection and more robust feature readiness. Technologies/skills demonstrated: testing framework enhancements, Git-based traceability, stealth testing approach, and CI integration readiness.
November 2025
1 Commits • 1 Features
Nov 1, 2025November 2025 — E3SM: Delivered a latitude-dependent background diffusivity function with a configurable maximum latitude and fixed transition width, integrated into the diffusivity module to enable latitude-aware simulations. No major bugs reported this period. Impact: improves model realism for high-latitude scenarios, reduces manual tuning, and supports climate-scenario analysis. Technologies/skills demonstrated: algorithm design for latitude-dependent diffusivity, configuration-driven development, code integration with existing diffusion workflows, and strong version-control discipline.
1 Commits • 1 Features
Nov 1, 2025November 2025 — E3SM: Delivered a latitude-dependent background diffusivity function with a configurable maximum latitude and fixed transition width, integrated into the diffusivity module to enable latitude-aware simulations. No major bugs reported this period. Impact: improves model realism for high-latitude scenarios, reduces manual tuning, and supports climate-scenario analysis. Technologies/skills demonstrated: algorithm design for latitude-dependent diffusivity, configuration-driven development, code integration with existing diffusion workflows, and strong version-control discipline.
November 2025
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary focused on stabilizing the test suite for the mpas-ocean component of E3SM by correcting the upwind advection test configuration to use the split_explicit time integrator. This change aligns the test with the intended integration scheme, reducing false failures and improving reproducibility across CI environments. Delivered with a targeted commit and reinforced testing discipline in the E3SM repository.
July 2025
1 Commits
Jul 1, 2025July 2025 monthly summary focused on stabilizing the test suite for the mpas-ocean component of E3SM by correcting the upwind advection test configuration to use the split_explicit time integrator. This change aligns the test with the intended integration scheme, reducing false failures and improving reproducibility across CI environments. Delivered with a targeted commit and reinforced testing discipline in the E3SM repository.
June 2025
5 Commits • 3 Features
Jun 1, 2025June 2025 performance highlights for E3SM: Key refactor and test enhancements with documentation upgrades. Land Ice Draft calculation refactor: make landIceDraftForSsh exclusive to landIcePressurePKG and remove the unused landIceDraftForSsh pointer from MLD analysis to improve modularity and maintainability (commits b2ae028bfc5de48ad3d3cfc3a115c29b1896bbdd, a57ac6f2291ebc62c4e805a5cd37046f483078f6). Spatially variable upwinding in the upwind test configuration was added to support min/max bounds and adaptive behavior based on spatial characteristics, improving advection accuracy (commit d692dadbea464cc08eacca9d0cc27cb6915b6648). Documentation improvements: clarify that surface values are not extrapolated from zMid to zTop and update inline diagnostics to reflect current surface tracer handling (commits e2ba718c13b1580eb04f372bbe8852bbe43e7aa6, be96654a9d75d735d61e387e2391f663c6834c79).
5 Commits • 3 Features
Jun 1, 2025June 2025 performance highlights for E3SM: Key refactor and test enhancements with documentation upgrades. Land Ice Draft calculation refactor: make landIceDraftForSsh exclusive to landIcePressurePKG and remove the unused landIceDraftForSsh pointer from MLD analysis to improve modularity and maintainability (commits b2ae028bfc5de48ad3d3cfc3a115c29b1896bbdd, a57ac6f2291ebc62c4e805a5cd37046f483078f6). Spatially variable upwinding in the upwind test configuration was added to support min/max bounds and adaptive behavior based on spatial characteristics, improving advection accuracy (commit d692dadbea464cc08eacca9d0cc27cb6915b6648). Documentation improvements: clarify that surface values are not extrapolated from zMid to zTop and update inline diagnostics to reflect current surface tracer handling (commits e2ba718c13b1580eb04f372bbe8852bbe43e7aa6, be96654a9d75d735d61e387e2391f663c6834c79).
June 2025
May 2025
10 Commits • 3 Features
May 1, 2025May 2025 performance summary for E3SM project focused on land-ice draft handling improvements, build/test stability, and mesh compatibility across SSH-based diagnostics. Delivered integrated landIceDraft diagnostics within SSH calculations and MLD adjustments, introduced configurable land-ice-draft mode with backward compatibility for legacy meshes, and cleaned test/namelist/build settings to reduce configuration errors. These changes enhance model accuracy, stability, and ease of experimentation across mesh types, supporting more reliable sensitivity analyses and faster iteration.
May 2025
10 Commits • 3 Features
May 1, 2025May 2025 performance summary for E3SM project focused on land-ice draft handling improvements, build/test stability, and mesh compatibility across SSH-based diagnostics. Delivered integrated landIceDraft diagnostics within SSH calculations and MLD adjustments, introduced configurable land-ice-draft mode with backward compatibility for legacy meshes, and cleaned test/namelist/build settings to reduce configuration errors. These changes enhance model accuracy, stability, and ease of experimentation across mesh types, supporting more reliable sensitivity analyses and faster iteration.
April 2025
4 Commits • 2 Features
Apr 1, 2025April 2025: Focused on reinforcing simulation defaults, restoring key physical forcings, and simplifying iceberg handling in the E3SM project to improve reproducibility, stability, and user configuration. The changes enhance long-run consistency across simulations, reduce drift, and provide clearer defaults for users configuring runs via namelists.
4 Commits • 2 Features
Apr 1, 2025April 2025: Focused on reinforcing simulation defaults, restoring key physical forcings, and simplifying iceberg handling in the E3SM project to improve reproducibility, stability, and user configuration. The changes enhance long-run consistency across simulations, reduce drift, and provide clearer defaults for users configuring runs via namelists.
April 2025
March 2025
13 Commits • 4 Features
Mar 1, 2025March 2025 performance summary for E3SM development. The team delivered high-value features and stability improvements across ocean-ice components, enabling more reliable experiments and cleaner maintenance. Key outcomes include: (1) freshwater tracer framework enablement with testing and reliability enhancements for configurable tracer advection; (2) upwinding configuration defaults for MPAS ocean models to support spatially varying schemes; (3) land ice diagnostics and wetting/drying management integrated into diagnostics for improved state tracking; (4) density standardization and code hygiene across modules to improve consistency and readability; and (5) a corrected iceberg latent heat flux calculation by removing a fixed iceberg temperature assumption, improving energy flux fidelity. These changes increase modeling fidelity, support reproducible experiments, and reduce risk in production runs.
March 2025
13 Commits • 4 Features
Mar 1, 2025March 2025 performance summary for E3SM development. The team delivered high-value features and stability improvements across ocean-ice components, enabling more reliable experiments and cleaner maintenance. Key outcomes include: (1) freshwater tracer framework enablement with testing and reliability enhancements for configurable tracer advection; (2) upwinding configuration defaults for MPAS ocean models to support spatially varying schemes; (3) land ice diagnostics and wetting/drying management integrated into diagnostics for improved state tracking; (4) density standardization and code hygiene across modules to improve consistency and readability; and (5) a corrected iceberg latent heat flux calculation by removing a fixed iceberg temperature assumption, improving energy flux fidelity. These changes increase modeling fidelity, support reproducible experiments, and reduce risk in production runs.
January 2025
4 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for E3SM (E3SM-Project/E3SM). Key accomplishments include implementing frazil ice meltwater temperature tendency calculation and enhancing MPAS-ocean with spatially variable upwinding. The features improve physical realism at the freezing point and enable a dynamic upwind factor per time step, while the centered-weighting minimum column thickness was adjusted based on drying_slope analysis. Business value includes more accurate ocean-ice coupling in polar regions, improved numerical stability, and more reliable climate projections. Technologies demonstrated include MPAS-ocean physics integration, dynamic diagnostic updates, and drying_slope-based parameter adaptation; commits: 90d3f90e88e7183265951454cbca2aeda593e5c6, 89e74107168c9baad5a9f8efdc7615433ee7e5e1, 2df3a12090d0ea8aba3890708565da5def025fd8, 6c67371c2684fb87fb8976f3e3fcbb7be1d35c95.
4 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for E3SM (E3SM-Project/E3SM). Key accomplishments include implementing frazil ice meltwater temperature tendency calculation and enhancing MPAS-ocean with spatially variable upwinding. The features improve physical realism at the freezing point and enable a dynamic upwind factor per time step, while the centered-weighting minimum column thickness was adjusted based on drying_slope analysis. Business value includes more accurate ocean-ice coupling in polar regions, improved numerical stability, and more reliable climate projections. Technologies demonstrated include MPAS-ocean physics integration, dynamic diagnostic updates, and drying_slope-based parameter adaptation; commits: 90d3f90e88e7183265951454cbca2aeda593e5c6, 89e74107168c9baad5a9f8efdc7615433ee7e5e1, 2df3a12090d0ea8aba3890708565da5def025fd8, 6c67371c2684fb87fb8976f3e3fcbb7be1d35c95.
January 2025
December 2024
2 Commits • 1 Features
Dec 1, 2024Monthly summary for 2024-12: Key features delivered and major fixes in the E3SM Manufactured Solution module, highlighting business value and technical improvements.
December 2024
2 Commits • 1 Features
Dec 1, 2024Monthly summary for 2024-12: Key features delivered and major fixes in the E3SM Manufactured Solution module, highlighting business value and technical improvements.
September 2024
3 Commits • 1 Features
Sep 1, 2024September 2024 monthly summary for E3SM: Focused on delivering ocean-model freshwater dynamics enhancements with validation and observability improvements. Key features include the addition of fresh-water source terms for del2 and del4 in the manufactured solution, introduction of a subglacial runoff freshwater tracer, and updates to the registry to track new freshwater-source variables. Validation checks were added to ensure proper association of freshwater fluxes in bulk forcing, improving robustness and reliability. No major bug fixes were reported this month; the work emphasizes feature delivery, code quality, and model realism. Impact includes improved realism of freshwater forcing, better tracing and diagnostics, and increased readiness for production-scale runs. Technologies/skills demonstrated include Fortran-based model development, registry-driven observability, validation patterns, and Git-based version control (commits: 995d87a2589a87db7917a6ec2c5c1a481d01ddf2; 6d9357c48d5077f8b49b01c9bf624fd07be9965d; f938f022fd4ac7c939b9e05d0c58947164764e64).
3 Commits • 1 Features
Sep 1, 2024September 2024 monthly summary for E3SM: Focused on delivering ocean-model freshwater dynamics enhancements with validation and observability improvements. Key features include the addition of fresh-water source terms for del2 and del4 in the manufactured solution, introduction of a subglacial runoff freshwater tracer, and updates to the registry to track new freshwater-source variables. Validation checks were added to ensure proper association of freshwater fluxes in bulk forcing, improving robustness and reliability. No major bug fixes were reported this month; the work emphasizes feature delivery, code quality, and model realism. Impact includes improved realism of freshwater forcing, better tracing and diagnostics, and increased readiness for production-scale runs. Technologies/skills demonstrated include Fortran-based model development, registry-driven observability, validation patterns, and Git-based version control (commits: 995d87a2589a87db7917a6ec2c5c1a481d01ddf2; 6d9357c48d5077f8b49b01c9bf624fd07be9965d; f938f022fd4ac7c939b9e05d0c58947164764e64).
September 2024
July 2024
2 Commits • 1 Features
Jul 1, 2024July 2024 monthly summary: Delivered Freshwater Tracer Configuration Enhancements in E3SM, introducing new namelist build options and MPAS-Ocean integration to improve freshwater tracer dynamics and flux tracking. Two commits contributed: b9ded791eb717d7c75a8a5a6cfdf8a09283ebab9 (Change namelist bld files) and dd670fc7084889fc0c50888d3af34aa265cb4225 (Update e3sm namelist files). No major bugs fixed this period. Impact: improved configurability and reproducibility of tracer budgets, enabling more accurate simulations and validation. Skills: Namelist-driven configuration, MPAS-Ocean modeling integration, version control, cross-repo coordination.
July 2024
2 Commits • 1 Features
Jul 1, 2024July 2024 monthly summary: Delivered Freshwater Tracer Configuration Enhancements in E3SM, introducing new namelist build options and MPAS-Ocean integration to improve freshwater tracer dynamics and flux tracking. Two commits contributed: b9ded791eb717d7c75a8a5a6cfdf8a09283ebab9 (Change namelist bld files) and dd670fc7084889fc0c50888d3af34aa265cb4225 (Update e3sm namelist files). No major bugs fixed this period. Impact: improved configurability and reproducibility of tracer budgets, enabling more accurate simulations and validation. Skills: Namelist-driven configuration, MPAS-Ocean modeling integration, version control, cross-repo coordination.
April 2024
3 Commits • 1 Features
Apr 1, 2024April 2024: Delivered key ocean model enhancements to improve freshwater budgeting and tracer-based experimentation in E3SM. Major feature: Freshwater Tracer Integration and Ice-Runoff Flux Correction in the Ocean Model, with routed surface fluxes and tracer tendencies integrated into the bulk forcing framework. Corrected ice runoff flux assignment to ensure freshwater contributions are mapped to the correct surface flux array; consolidated freshwater flux handling into the bulk forcing workflow for consistency and maintainability. These changes enable more realistic freshwater budgets, higher-fidelity salinity fields, and support for tracer-enabled climate studies.
3 Commits • 1 Features
Apr 1, 2024April 2024: Delivered key ocean model enhancements to improve freshwater budgeting and tracer-based experimentation in E3SM. Major feature: Freshwater Tracer Integration and Ice-Runoff Flux Correction in the Ocean Model, with routed surface fluxes and tracer tendencies integrated into the bulk forcing framework. Corrected ice runoff flux assignment to ensure freshwater contributions are mapped to the correct surface flux array; consolidated freshwater flux handling into the bulk forcing workflow for consistency and maintainability. These changes enable more realistic freshwater budgets, higher-fidelity salinity fields, and support for tracer-enabled climate studies.
April 2024
Activity
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Quality Metrics
Correctness89.2%
Maintainability89.6%
Architecture85.4%
Performance81.6%
AI Usage20.4%
Skills & Technologies
Programming Languages
FortranPerlPythonShellXML
Technical Skills
Atmospheric ScienceBuild System ConfigurationBuild SystemsClimate ModelingClimate ScienceCode ConsistencyCode DocumentationCode RefactoringCode RefinementConfigurationConfiguration ManagementDocumentationFortranFortran DevelopmentFortran Programming
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