The LARS-WG model integrates 15 climate models from the multi-model ensemble used in the IPCC Fourth Assessment Report (AR4) to reduce uncertainty in climate predictions resulting from structural differences in the global climate models, as well as uncertainty due to variations in initial conditions or model parameterizations [15].
The LARS-WG model is still in the development phase and not stable at all times. Lutz et al. [22] compare the latest climate change projections generated for the IPCC report (CMIP5) and projections used in the fourth IPCC assessment (CMIP3); the spread in projections of future glacier extent in Central Asia is similar for both ensembles. Uncertainties in
climate change projections increase with the length of the time horizon. In the near-term (the 2020s), climate model uncertainties play the most important role; while over longer time horizons, uncertainties due to the selection of the emissions scenario become increasingly significant [23].