run2-glm-config

name	run2_glm-config
description	Advanced GLM configuration and calibration strategies for vertical temperature profiles.

Advanced GLM Configuration

The General Lake Model (GLM) performance depends on several key parameters that govern energy balance and mixing.

Calibration Parameters and Effects

• Kw (Light Extinction): Controls how deep light penetrates. Higher Kw keeps deep layers cooler and surface layers warmer. Range: [0.1, 0.5].
• wind_factor: Scales input wind speed. Affects surface mixing and latent/sensible heat fluxes. Range: [0.7, 1.3].
• lw_factor: Scales incoming longwave radiation. Affects the overall heat budget. Range: [0.7, 1.3].
• ch (Sensible Heat Transfer): Bulk coefficient for sensible heat flux. Affects surface temperature. Range: [0.0005, 0.002].
• coef_mix_hyp: Controls mixing below the thermocline. Lower values reduce heating of the hypolimnion. Range: [0.3, 0.7].

Configuration Workflow

1. Baseline Run: Start with default parameters.
2. Energy Balance: Adjust lw_factor and ch to align the overall temperature magnitude.
3. Stratification: Adjust Kw and wind_factor to match the thermocline depth and surface temperatures.
4. Deep Mixing: Adjust coef_mix_hyp to match deep water temperatures during summer.

Example sed command for precise replacement:

sed -i 's/\bKw\s*=\s*[0-9.e+-]*/Kw = 0.4/' glm3.nml

Or use Python regex for more complex cases.