What Are General Circulation Models (GCMs)of the Atmosphere

What are general circulation models (GCMs) of the atmosphere?

A) These are pre-computer based models that estimated atmospheric and oceanic circulation and are now being used to study climate change.
B) These are highly simplistic models that use one or two variables to test the veracity of climate proxies,such as ice core and ocean sediment core samples.
C) These are based on statistical three-dimensional grids that characterize portions of the atmosphere and ocean in terms of climate-related variables.
D) These are used to calculate the concentrations of greenhouse gases in the atmosphere based on data from weather stations located around the globe.

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