Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
Zur Ablage hinzufügen
  Lokale TagsFreigabegeschichteDetailsÜbersicht

Freigegeben
Zeitschriftenartikel

Vertical resolution refinement in an aqua-planet and its effect on the ITCZ

MPG-Autoren

Retsch,  Matthias Heinz
Hans Ertel Research Group Clouds and Convection, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons59492

Hohenegger,  Cathy
Hans Ertel Research Group Clouds and Convection, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37347

Stevens,  Bjorn       
Director’s Research Group AES, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

Externe Ressourcen
Es sind keine externen Ressourcen hinterlegt
Volltexte (beschränkter Zugriff)
Für Ihren IP-Bereich sind aktuell keine Volltexte freigegeben.
Volltexte (frei zugänglich)
Ergänzendes Material (frei zugänglich)

Retsch_JAMES_2017.tar
(Ergänzendes Material), 43MB

Zitation

Retsch, M. H., Hohenegger, C., & Stevens, B. (2017). Vertical resolution refinement in an aqua-planet and its effect on the ITCZ. Journal of Advances in Modeling Earth Systems, 9, 2425-2436. doi:10.1002/2017MS001010.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002C-ED1C-6
Zusammenfassung
The General Circulation Model ECHAM is used to study the effects of three refined vertical resolutions on convection in the tropics and on the structure of the intertropical convergence zone (ITCZ). Additional vertical resolutions have 76, 134, or 192 levels, which is over four times the default resolution of 47 levels. New levels are placed in the troposphere only. The simulations are conducted on an aqua-planet with equator symmetrical, time and zonal independent sea surface temperature, and without a yearly solar cycle. Whereas the default vertical resolution shows a double ITCZ, refining the vertical resolution yields an equatorward shift of the ITCZ. The ITCZ converges to its equatorial position with 134 levels. The sensitivity of the ITCZ to the vertical resolution is traced back first and foremost to the mixing formulation in the convection scheme. Here a higher number of vertical levels leads to a stronger mixing between the updraft and its environment by design, which favors an equatorward position of the ITCZ. Differences in the relative humidity profiles explain the remaining differences in the ITCZ location. These differences can mostly be eliminated by making clouds transparent.