Is the weather generator a physical concept?

Yes.

According to the query of the Department of Geographic Sciences of Beijing Normal University, weather generators (Weather generators) are based on the statistical characteristics of historical observed meteorological elements and belong to the physical range concept. They physically generate a certain location through random simulation methods. Or meteorological data of any length of time in a certain area and with similar statistical characteristics to the observation sequence. So weather generators are physical concepts.

Estimating the impact of future climate change on the natural environment and social economy can provide decision-making support for humans to respond to the risks brought by climate change. The climate scenarios simulated by global climate models (GCMs) have a coarse spatiotemporal scale, while the climate scenarios required for regional and local scale climate change impact assessments have a finer spatiotemporal scale. The downscaling method has become a powerful tool to connect the two scales.