What is it about?
Instead of imposing local compensation of convective mass flux, a hybrid mass flux cumulus scheme (HYMACS) dynamically resolves mass compensation, making the dynamic response to a prescribed mass lifting to change less with changes in grid-cell width.
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Why is it important?
This study points out a problem and a remedy in representing convection in weather and climate models when computer resources allow finer model grids than in tradition, which may lead to model development that improves prediction, which improves our lives.
Perspectives
In atmospheric convection, convective drafts bring air mass up or down, and a wider environment brings air mass back in compensation. All these processes occur within a ~100-km-wide model grid cell, so the models cannot resolve convection and instead parameterize the bulk effects of both convective drafts and the environment. However, with increasing computer resources, models can run with ~10-km-wide grid cells, wider than convective drafts but narrower than the environment. Is there any consequences of imposing environmental compensating mass flux within a ~10-km-wide grid cell? This question motivates me to do this study.
Hing Ong
University of California, Davis
Read the Original
This page is a summary of: Effects of artificial local compensation of convective mass flux in the cumulus parameterization, Journal of Advances in Modeling Earth Systems, August 2017, American Geophysical Union (AGU),
DOI: 10.1002/2017ms000926.
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