Dynamical downscaling: Assessment of model system dependent retained and added variability for two different regional climate models

Burkhardt Rockel, Christopher Castro, Roger A. Pielke, Hans von Storch, Giovanni Leoncini

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

In this paper, we compare the retained and added variability obtained using the regional climate model CLM (Climate version of the Local Model of the German Weather Service) to an earlier study using the RAMS (Regional Atmospheric Modeling System) model. Both models yield similar results for their standard configurations with a commonly used nudging technique applied to the driving model fields. Significantly both models do not adequately retain the large-scale variability in total kinetic energy with results poorer on a larger grid domain. Additional experiments with interior nudging, however, permit the retention of large-scale values for both models. The spectral nudging technique permits more added variability at smaller scales than a four-dimensional internal grid nudging on large domains. We also confirmed that dynamic downscaling does not retain (or increase) simulation skill of the large-scale fields over and beyond that which exists in the larger-scale model or reanalysis. Our conclusions should be relevant to all applications of dynamic downscaling for regional climate simulations.

Original languageEnglish (US)
Article numberD21107
JournalJournal of Geophysical Research: Space Physics
Volume113
Issue number21
DOIs
StatePublished - Nov 16 2008

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Climate models
climate models
downscaling
regional climate
climate modeling
climate
grids
scale models
atmospheric modeling
weather
kinetic energy
simulation
Kinetic energy
configurations

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Dynamical downscaling : Assessment of model system dependent retained and added variability for two different regional climate models. / Rockel, Burkhardt; Castro, Christopher; Pielke, Roger A.; von Storch, Hans; Leoncini, Giovanni.

In: Journal of Geophysical Research: Space Physics, Vol. 113, No. 21, D21107, 16.11.2008.

Research output: Contribution to journalArticle

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