Impact of Subgrid-scale Radiative Heating Variability on the Stratocumulus-to-trade Cumulus Transition in Climate Models

TitleImpact of Subgrid-scale Radiative Heating Variability on the Stratocumulus-to-trade Cumulus Transition in Climate Models
Publication TypeJournal Article
Year of Publication2014
JournalJournal of Geophysical Research Atmospheres
Date Published04/2014
Abstract / Summary

Subgrid-scale interactions between turbulence and radiation are potentially important for accurately simulating marine low clouds in climate models. To better understand the impact of these interactions, the Weather Research and Forecasting model is configured for large eddy simulation to study the stratocumulus to trade cumulus (Sc-to-Cu) transition. Using the Global Energy and Water Cycle Experiment Atmospheric System Studies composite Lagrangian transition case and the Atlantic Trade Wind Experiment case, it is shown that the lack of subgrid-scale turbulence-radiation interaction, as is the case in current generation climate models, accelerates the Sc-to-Cu transition. Our analysis suggests that subgrid-scale turbulence-radiation interactions in cloud-topped boundary layers contribute to stronger production of temperature variance, which in turn leads to stronger buoyancy production of turbulent kinetic energy and helps to maintain the Sc cover.

DOI10.1002/2013JD020999
Journal: Journal of Geophysical Research Atmospheres
Year of Publication: 2014
Date Published: 04/2014

Subgrid-scale interactions between turbulence and radiation are potentially important for accurately simulating marine low clouds in climate models. To better understand the impact of these interactions, the Weather Research and Forecasting model is configured for large eddy simulation to study the stratocumulus to trade cumulus (Sc-to-Cu) transition. Using the Global Energy and Water Cycle Experiment Atmospheric System Studies composite Lagrangian transition case and the Atlantic Trade Wind Experiment case, it is shown that the lack of subgrid-scale turbulence-radiation interaction, as is the case in current generation climate models, accelerates the Sc-to-Cu transition. Our analysis suggests that subgrid-scale turbulence-radiation interactions in cloud-topped boundary layers contribute to stronger production of temperature variance, which in turn leads to stronger buoyancy production of turbulent kinetic energy and helps to maintain the Sc cover.

DOI: 10.1002/2013JD020999
Citation:
Xiao, H, WI Gustafson Jr., and H Wang.  2014.  "Impact of Subgrid-scale Radiative Heating Variability on the Stratocumulus-to-trade Cumulus Transition in Climate Models."  Journal of Geophysical Research Atmospheres.  https://doi.org/10.1002/2013JD020999.