Minimal glacier models

摘要: During the past few decades study of glaciers and their response to climate change has shown a strong development. Early theoretical work in fifties sixties been complemented by construction numerical models ice sheets with various degrees complexity. Observations from space have given us much better view on where are what they look like. More recently, advanced techniques like SAR interferometry revealed an unexpectedly rich dynamic behaviour many bodies. Fast flow (intermittent or continuous) observed large number glaciers, this finding suggests that may adjust more quickly than hitherto assumed. In these developments it seem bit odd write text “Minimal Glacier Models“. Why play around simple quasi-analytical if computer power is virtually unlimited run codes very high resolution? Well, digging into for 20 years me modelling also negative sides. First all, documentation (including my own) normally inadequate, details how boundary conditions implemented scheme generally not described, altogether reproducibility poor. An outstanding problem dependence solutions resolution computational mesh grid, particular when balance rate depends surface elevation, position grounding line plays important role evolution sheet. This criticism meant claim one should stick simpler models, but helps appreciate there lines along which can be studied. Simple first all learning tools. There intrinsic value solved analytically coded student couple days. advantage parameter explored great detail. means feeling developed matters fairly unsignificant. useful find out robust complex is. Subtle instabilities lost going freedom (in model spatial resolution) minimal model). It knowledge about “dimensionality“ process. focus interaction between - mechanics glacier flow. involves feedbacks mechanism captured models. The altitude most obvious example, leads nonlinear studied well