caa a22 4500 605472084 CHVBK 20210128100336.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00382-014-2396-x doi (NATIONALLICENCE)springer-10.1007/s00382-014-2396-x Effect of horizontal resolution on ECHAM6-AMIP performance [Elektronische Daten] [Eileen Hertwig, Jin-Song von Storch, Dörthe Handorf, Klaus Dethloff, Irina Fast, Thomas Krismer] This study analyzes the effect of increasing horizontal resolution in the atmospheric model ECHAM6 on the simulated mean climate state and climate variability. For that purpose three AMIP-style simulations with the resolutions T63L95, T127L95, and T255L95 are compared to reanalysis data and observations. Biases in atmospheric fields as well as tropospheric and stratospheric biases individually are analyzed. Besides mean errors of the climate state and the variance, some atmospheric phenomena with different time scales are studied at the three horizontal resolutions: the transient eddy kinetic energy, storm tracks, atmospheric teleconnections, the Madden-Julian-Oscillation (MJO), and the Quasi-Biennial Oscillation (QBO). The main result is that, overall, the bias of the simulated climate is reduced with increasing resolution when considering the mean state and the variance. A greater improvement takes place in the extra-tropical than in the tropical troposphere. The errors in the stratosphere are generally larger but the relative benefit of increasing resolution is greater than in the troposphere and we find that stratospheric phenomena, like the QBO, are sensitive to horizontal resolution. Globally, the bias of the mean state improves by 19%, while the bias of the variability improves by 15% (from T63 to T255). Major challenges remain the simulation of the precipitation and climate features like the MJO, which might require a coupled atmosphere-ocean model. Springer-Verlag Berlin Heidelberg, 2014 Hertwig Eileen Max Planck Institute for Meteorology, Bundesstraße 53, 20146, Hamburg, Germany aut von Storch Jin-Song Max Planck Institute for Meteorology, Bundesstraße 53, 20146, Hamburg, Germany aut Handorf Dörthe Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany aut Dethloff Klaus Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany aut Fast Irina German Climate Computing Center, Hamburg, Germany aut Krismer Thomas Max Planck Institute for Meteorology, Bundesstraße 53, 20146, Hamburg, Germany aut Climate Dynamics Springer Berlin Heidelberg 45/1-2(2015-07-01), 185-211 0930-7575 45:1-2<185 2015 45 382 https://doi.org/10.1007/s00382-014-2396-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2396-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hertwig Eileen Max Planck Institute for Meteorology, Bundesstraße 53, 20146, Hamburg, Germany aut NATIONALLICENCE 700 1- von Storch Jin-Song Max Planck Institute for Meteorology, Bundesstraße 53, 20146, Hamburg, Germany aut NATIONALLICENCE 700 1- Handorf Dörthe Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany aut NATIONALLICENCE 700 1- Dethloff Klaus Alfred Wegener Institute for Polar and Marine Research, Potsdam, Germany aut NATIONALLICENCE 700 1- Fast Irina German Climate Computing Center, Hamburg, Germany aut NATIONALLICENCE 700 1- Krismer Thomas Max Planck Institute for Meteorology, Bundesstraße 53, 20146, Hamburg, Germany aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/1-2(2015-07-01), 185-211 0930-7575 45:1-2<185 2015 45 382