Scale-aware parameterization of cloud fraction and condensate for a
global atmospheric model machine-learnt from coarse-grained
kilometer-scale simulations
Abstract
Kilometer grid-length simulations over a variety of different locations
worldwide are used as training data for a deep-learning model designed
to predict clouds in a global climate model.
The inputs to the neural network are profiles of temperature, humidity
and pressure
from the high-resolution model, averaged to the scale of the climate
model.
The outputs are profiles of cloud fraction, liquid water content and ice
water content.
The high-resolution data is coarse-grained to a range of sizes, allowing
the model to learn how the cloud formation depends on the size of the
area being considered.
The machine-learnt cloud cover and condensate scheme is coupled to a
global climate model and used to run multi-year simulations where the
clouds predicted by the neural-network are fully interacting with the
rest of the model.