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Python Glacier Evolution Model “PyGEM” Manual

David R. Rounce and Regine Hock

Correspondence to: David R. Rounce (drounce@alaska.edu)

OVERVIEW Python Glacier Evolution Model (PyGEM) is an open-source glacier evolution model coded in Python that models the transient evolution of glaciers. Each glacier is modeled independently using a monthly time step. PyGEM has a modular framework that allows different schemes to be used for model calibration or model physics (e.g., climatic mass balance, glacier dynamics). The minimum data required to run the model is a glacier inventory and climate data. We recommend using glacier thickness, area, and width data to more explicitly account for glacier dynamics scheme. In the absence of these data, the model could be run using some form of volume-area-length scaling. Model parameters need to be calibrated and results should be validated using some form of mass balance data (altimetric, glaciological, geodetic, or gravimetric), runoff, snowline, or equilibrium line altitude data. The model has been developed to seamlessly integrate with publicly available glaciological and geodetic measurements (WGMS, 2017). Specific details regarding model parameterization are in subsequent sections.

Table of Contents:

1. Getting started