Impact of increased vertical resolution on simulation of tropical climate

Paolo M. Ruti, D. Di Rocco, S. Gualdi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The aim of this study is to describe the behaviour of tropical dynamics in the ECHAM4 model when increased vertical resolution around the tropopause and in the planetary boundary layer is used. In this work we perform experiments with the ECHAM4 model using T30 horizontal resolution and 19 and 42 vertical levels. The impact of the increased vertical resolution on the simulation of tropical clouds and precipitation has been investigated. Therefore, the dynamic fields related to tropical convection have been analyzed. The results suggest a beneficial effect of the increased number of vertical levels on the convective scheme performance and on the related dynamic fields over the Tropics. The improvement of the rainfall climatologies in the 42-level model has been explained via the impact of vertical resolution on the cloud structure. In the cloud spectrum of the L42 simulation, a third peak appears around 600hPa, revealing that when using higher vertical resolution the convective parametrization starts to represent cumulus congestus clouds. © Springer-Verlag 2006.
Original languageEnglish
Pages (from-to)61 - 80
Number of pages20
JournalTheorectical and Applied Climatology
Volume85
Issue number1-2
DOIs
Publication statusPublished - May 2006
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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