Cloud Process Coupling and Time Integration in the E3SM Atmosphere Model

Abstract In this study, we find significant sensitivity to the choice of time step for the Energy Exascale Earth System Model's atmospheric component, leading to large decreases in the magnitude of cloud forcing when the time step is reduced to 10 s. Reducing the time step size for the microphy...

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Autores principales:	Sean Patrick Santos, Peter M. Caldwell, Christopher S. Bretherton
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	E3SM GCM process coupling time step Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/de83fde07fe84957ab69d11e2e7da253
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id	oai:doaj.org-article:de83fde07fe84957ab69d11e2e7da253
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spelling	oai:doaj.org-article:de83fde07fe84957ab69d11e2e7da2532021-11-24T08:11:41ZCloud Process Coupling and Time Integration in the E3SM Atmosphere Model1942-246610.1029/2020MS002359https://doaj.org/article/de83fde07fe84957ab69d11e2e7da2532021-05-01T00:00:00Zhttps://doi.org/10.1029/2020MS002359https://doaj.org/toc/1942-2466Abstract In this study, we find significant sensitivity to the choice of time step for the Energy Exascale Earth System Model's atmospheric component, leading to large decreases in the magnitude of cloud forcing when the time step is reduced to 10 s. Reducing the time step size for the microphysics increases precipitation, leading to a drying of the atmosphere and an increase in surface evaporation. This effect is amplified when the microphysics is substepped together with other cloud physics processes. Coupling the model's dynamics and physics more frequently reduces cloud fraction at lower altitudes, while producing more cloud liquid at higher altitudes. Reducing the deep convection time step also reduces low cloud mass and cloud fraction. Together, these results suggest that cloud physics in a global circulation model can depend strongly on time step and, in particular, on the frequency with which cloud‐related processes are coupled with each other and with the model dynamics.Sean Patrick SantosPeter M. CaldwellChristopher S. BrethertonAmerican Geophysical Union (AGU)articleE3SMGCMprocess couplingtime stepPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 13, Iss 5, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	E3SM GCM process coupling time step Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	E3SM GCM process coupling time step Physical geography GB3-5030 Oceanography GC1-1581 Sean Patrick Santos Peter M. Caldwell Christopher S. Bretherton Cloud Process Coupling and Time Integration in the E3SM Atmosphere Model
description	Abstract In this study, we find significant sensitivity to the choice of time step for the Energy Exascale Earth System Model's atmospheric component, leading to large decreases in the magnitude of cloud forcing when the time step is reduced to 10 s. Reducing the time step size for the microphysics increases precipitation, leading to a drying of the atmosphere and an increase in surface evaporation. This effect is amplified when the microphysics is substepped together with other cloud physics processes. Coupling the model's dynamics and physics more frequently reduces cloud fraction at lower altitudes, while producing more cloud liquid at higher altitudes. Reducing the deep convection time step also reduces low cloud mass and cloud fraction. Together, these results suggest that cloud physics in a global circulation model can depend strongly on time step and, in particular, on the frequency with which cloud‐related processes are coupled with each other and with the model dynamics.
format	article
author	Sean Patrick Santos Peter M. Caldwell Christopher S. Bretherton
author_facet	Sean Patrick Santos Peter M. Caldwell Christopher S. Bretherton
author_sort	Sean Patrick Santos
title	Cloud Process Coupling and Time Integration in the E3SM Atmosphere Model
title_short	Cloud Process Coupling and Time Integration in the E3SM Atmosphere Model
title_full	Cloud Process Coupling and Time Integration in the E3SM Atmosphere Model
title_fullStr	Cloud Process Coupling and Time Integration in the E3SM Atmosphere Model
title_full_unstemmed	Cloud Process Coupling and Time Integration in the E3SM Atmosphere Model
title_sort	cloud process coupling and time integration in the e3sm atmosphere model
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/de83fde07fe84957ab69d11e2e7da253
work_keys_str_mv	AT seanpatricksantos cloudprocesscouplingandtimeintegrationinthee3smatmospheremodel AT petermcaldwell cloudprocesscouplingandtimeintegrationinthee3smatmospheremodel AT christophersbretherton cloudprocesscouplingandtimeintegrationinthee3smatmospheremodel
_version_	1718415829203156992

Cloud Process Coupling and Time Integration in the E3SM Atmosphere Model

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