Firn-air Modelling in the Community Firn Model ...

• Main Author: Holm, Jesper Ejlebæk
• Format: Text
• Language: English
• Published: Zenodo 2023
• Subjects: Polar firn; Brent's method; Community Firn Model; Ice Core; ice core
• Online Access: https://dx.doi.org/10.5281/zenodo.7998161; https://zenodo.org/record/7998161

Abstract: Over the last glacial period, a series of 25 climate fluctuations were observed, characterized by rapid warming followed by a longer cooling period. One of these Dansgaard-Oescher (D-O) events happened around 11,500 years ago and heralded the end of the ice age and the beginning of the Holocene period. To simulate these events, studies use firn densification models coupled to air and heat diffusion in order to reconstruct paleotemperatures. The Community Firn Model (CFM) is one such example, and it provides an open-source-modular framework to simulate physical processes in the firn. A 1-dimensional Lagrangian grid is used where density is explicitly calculated while diffusion is solved through an implicit Finite Volume Method (FVM). The project seeks to aid in the interpretation of these DO-events by conducting two experiments to better understand the model’s behaviour under different conditions. Initially, we examine the behaviour of the CFM with different densification schemes by testing a ...