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The Separate Physics and Dynamics Experiment (SPADE) framework for determining resolution awareness: A case study of microphysics
Author(s) -
Gustafson William I.,
Ma PoLun,
Xiao Heng,
Singh Balwinder,
Rasch Philip J.,
Fast Jerome D.
Publication year - 2013
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/jgrd.50711
Subject(s) - grid , meteorology , resolution (logic) , cloud physics , climate model , statistical physics , cloud computing , physics , environmental science , computer science , geography , climate change , geology , artificial intelligence , oceanography , geodesy , operating system
Multiresolution dynamical cores for weather and climate modeling are pushing the atmospheric community toward developing scale aware or, more specifically, resolution aware parameterizations that function properly across a range of grid spacings. Determining resolution dependence of specific model parameterizations is difficult due to resolution dependencies in many model components. This study presents the Separate Physics and Dynamics Experiment (SPADE) framework for isolating resolution dependent behavior of specific parameterizations without conflating resolution dependencies from other portions of the model. To demonstrate SPADE, the resolution dependence of the Morrison microphysics, from the Weather Research and Forecasting model, and the Morrison‐Gettelman microphysics, from the Community Atmosphere Model, are compared for grid spacings spanning the cloud modeling gray zone. It is shown that the Morrison scheme has stronger resolution dependence than Morrison‐Gettelman, and the partial cloud fraction capability of Morrison‐Gettelman is not the primary reason for this difference.