E3SM-Project/E3SM
Nov 2024 – Jul 2025
8 Months active
Languages Used
Fortran
Technical Skills
Climate ModelingCode RefactoringFortran ProgrammingOceanographyConfiguration ManagementDebugging
Alexander Hager
PROFILE
Alexander Hager
Andrew Hager developed and refined core ocean-ice interaction features for the E3SM-Project/E3SM repository, focusing on ice shelf melt modeling, thermal forcing, and coastal dynamics. He applied Fortran and high-performance computing techniques to restructure thermal forcing workflows, enhance inland sea and lake handling, and improve data integrity across parallel simulations. His work included robust error handling, configuration management, and code refactoring to ensure maintainability and scientific accuracy. By introducing flexible 3D and 2D forcing logic, improving mask and halo exchanges, and extending restart capabilities, Andrew delivered deeper model fidelity and stability for complex climate and glaciology simulations in production environments.
Overall Statistics
Feature vs Bugs
63%Features
Repository Contributions
68Total
Bugs
7
Commits
68
Features
12
Lines of code
2,198
Activity Months8
Your Network
164 people
Work History
July 2025
16 Commits • 2 Features
Jul 1, 2025Monthly Summary for 2025-07 (E3SM): Key features delivered include Ice Shelf Melt and Thermal Forcing Enhancements and Inland Lakes Melt Modeling with data integrity improvements. Major bugs fixed cover validation and robustness of melt calculations and consistency in ocean masking. Overall impact: more robust, reliable simulations with improved data integrity and cross-method compatibility. Technologies/skills demonstrated span defensive programming, input validation, and iterative code enhancements across complex MPAS workflows.
16 Commits • 2 Features
Jul 1, 2025Monthly Summary for 2025-07 (E3SM): Key features delivered include Ice Shelf Melt and Thermal Forcing Enhancements and Inland Lakes Melt Modeling with data integrity improvements. Major bugs fixed cover validation and robustness of melt calculations and consistency in ocean masking. Overall impact: more robust, reliable simulations with improved data integrity and cross-method compatibility. Technologies/skills demonstrated span defensive programming, input validation, and iterative code enhancements across complex MPAS workflows.
July 2025
June 2025
6 Commits
Jun 1, 2025June 2025 performance summary for E3SM project (E3SM repo). Focused on hardening ice shelf melt physics and improving code quality to deliver reliable, accurate, and maintainable climate model components. Key work centered on ice shelf melt subroutine corrections, stability enhancements, and development discipline that supports future physics improvements and maintainability.
June 2025
6 Commits
Jun 1, 2025June 2025 performance summary for E3SM project (E3SM repo). Focused on hardening ice shelf melt physics and improving code quality to deliver reliable, accurate, and maintainable climate model components. Key work centered on ice shelf melt subroutine corrections, stability enhancements, and development discipline that supports future physics improvements and maintainability.
May 2025
10 Commits • 2 Features
May 1, 2025May 2025 monthly summary for E3SM development focusing on delivering robust physics improvements, configuration hygiene, and maintainability gains. The work emphasizes business value through more accurate forcing, faster and more reliable runs, and cleaner code for future enhancements.
10 Commits • 2 Features
May 1, 2025May 2025 monthly summary for E3SM development focusing on delivering robust physics improvements, configuration hygiene, and maintainability gains. The work emphasizes business value through more accurate forcing, faster and more reliable runs, and cleaner code for future enhancements.
May 2025
April 2025
9 Commits
Apr 1, 2025April 2025 performance snapshot for E3SM: Implemented robustness and correctness improvements in marine mask handling and ocean extrapolation; restructured OceanField with Time dimension for accurate extrapolations; refined halo timing/measurement for data consistency; updated default extrapolation settings to improve inland-sea accuracy. These changes deliver more reliable coastal simulations, reduce risk of invalid extrapolated values across MPI ranks, and improve overall model accuracy.
April 2025
9 Commits
Apr 1, 2025April 2025 performance snapshot for E3SM: Implemented robustness and correctness improvements in marine mask handling and ocean extrapolation; restructured OceanField with Time dimension for accurate extrapolations; refined halo timing/measurement for data consistency; updated default extrapolation settings to improve inland-sea accuracy. These changes deliver more reliable coastal simulations, reduce risk of invalid extrapolated values across MPI ranks, and improve overall model accuracy.
March 2025
11 Commits • 4 Features
Mar 1, 2025March 2025 (2025-03) focused on delivering robust coastal and ice-ocean dynamics, extending restart capability with temperature and salinity data, and improving masking, forcing, and melt physics to enhance reliability and scientific value of E3SM simulations. Key outcomes include four major features delivered, targeted bug fixes for non-physical data handling, and code hygiene improvements that collectively improve coastal realism, restart reliability, and run stability for extended climate simulations.
11 Commits • 4 Features
Mar 1, 2025March 2025 (2025-03) focused on delivering robust coastal and ice-ocean dynamics, extending restart capability with temperature and salinity data, and improving masking, forcing, and melt physics to enhance reliability and scientific value of E3SM simulations. Key outcomes include four major features delivered, targeted bug fixes for non-physical data handling, and code hygiene improvements that collectively improve coastal realism, restart reliability, and run stability for extended climate simulations.
March 2025
February 2025
13 Commits • 2 Features
Feb 1, 2025February 2025 — E3SM focused on strengthening ocean forcing fidelity and inland-seas observability. Delivered two primary feature streams: Thermal forcing and ocean extrapolation improvements, and inland-seas connectivity debugging enhancements. Key outcomes include a robust recalculation workflow for thermal forcing, refined 2D forcing logic and depth indexing, and tighter error handling for invalid ocean values. Enhanced visibility into marineMask behavior to validate inland-seas connectivity and prevent propagation of invalid data locations. Notable commits include: 'create call for recalculate_thermal_forcing', 'debug recalculate_thermal_forcing', 'Update invalid ocean value error messages', 'FOR DEBUGGING: output connectedMarineMask', and 'Add debugging output variable'. These changes improve model fidelity, numerical stability, and the ability to validate marine connectivity under challenging ocean-ice configurations.
February 2025
13 Commits • 2 Features
Feb 1, 2025February 2025 — E3SM focused on strengthening ocean forcing fidelity and inland-seas observability. Delivered two primary feature streams: Thermal forcing and ocean extrapolation improvements, and inland-seas connectivity debugging enhancements. Key outcomes include a robust recalculation workflow for thermal forcing, refined 2D forcing logic and depth indexing, and tighter error handling for invalid ocean values. Enhanced visibility into marineMask behavior to validate inland-seas connectivity and prevent propagation of invalid data locations. Notable commits include: 'create call for recalculate_thermal_forcing', 'debug recalculate_thermal_forcing', 'Update invalid ocean value error messages', 'FOR DEBUGGING: output connectedMarineMask', and 'Add debugging output variable'. These changes improve model fidelity, numerical stability, and the ability to validate marine connectivity under challenging ocean-ice configurations.
January 2025
2 Commits • 1 Features
Jan 1, 2025January 2025: Delivered targeted refactor and cleanup in the MPAS Ocean Extrapolation module for E3SM, focusing on configurability and maintainability. Key improvements enable external configuration and cross-module usage, and reduce technical debt through cleanup and reference correction.
2 Commits • 1 Features
Jan 1, 2025January 2025: Delivered targeted refactor and cleanup in the MPAS Ocean Extrapolation module for E3SM, focusing on configurability and maintainability. Key improvements enable external configuration and cross-module usage, and reduce technical debt through cleanup and reference correction.
January 2025
November 2024
1 Commits • 1 Features
Nov 1, 20242024-11 Monthly summary: Delivered a feature refactor to consolidate 3D thermal forcing profiles into 2D scalars for MALI configurations, aligning code paths that do not use ocean extrapolation. The change preserves core logic while improving consistency, maintainability, and future testability across configurations. No major bugs fixed this month; efforts focused on clean feature delivery and repository alignment.
November 2024
1 Commits • 1 Features
Nov 1, 20242024-11 Monthly summary: Delivered a feature refactor to consolidate 3D thermal forcing profiles into 2D scalars for MALI configurations, aligning code paths that do not use ocean extrapolation. The change preserves core logic while improving consistency, maintainability, and future testability across configurations. No major bugs fixed this month; efforts focused on clean feature delivery and repository alignment.
Activity
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Quality Metrics
Correctness84.6%
Maintainability84.2%
Architecture80.0%
Performance69.6%
AI Usage20.2%
Skills & Technologies
Programming Languages
Fortran
Technical Skills
Bug FixingClimate ModelingCode RefactoringCode ReversionCode ReviewConfiguration ManagementConstants ManagementData ManagementData ValidationDebuggingError HandlingFortran DevelopmentFortran ProgrammingGlaciologyHigh-Performance Computing
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