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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-316
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-316
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model evaluation paper 03 Dec 2019

Submitted as: model evaluation paper | 03 Dec 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Near global scale high-resolution seasonal simulations with WRF-NOAHMP v.3.8.1

Thomas Schwitalla1, Kirsten Warrach-Sagi1, Volker Wulfmeyer1, and Michael Resch2 Thomas Schwitalla et al.
  • 1Institute of Physics and Meteorology, University of Hohenheim, Stuttgart, 70599, Germany
  • 2High-Performance Computing Center Stuttgart, Stuttgart, Germany

Abstract. The added value of global simulations on the convection-permitting (CP) scale is a subject of extensive research in the earth system science community. An increase in predictive skill can be expected due to advanced representations of feedbacks and teleconnections in the ocean-land-atmosphere system. However, the proof of this hypothesis by corresponding simulations is computationally and scientifically extremely demanding. We present a novel latitude-belt simulation from 57° S to 65° N using the WRF-NOAHMP model system with a grid increment of 0.03° km over a period of 5 months forced by sea surface temperature observations. In comparison to a latitude-belt simulation with 45 km resolution, at CP resolution the representation of the spatial-temporal scales as well as the organization of tropical convection are improved considerably. The teleconnection pattern are very close to that of the operational ECMWF analyses. The CP simulation is associated with an improvement of the precipitation forecast over South America, Africa, and the Indian Ocean and considerably improves the representation of cloud coverage along the tropics. Our results demonstrate a significant added value of future simulations on the CP scale up to the seasonal forecast range.

Thomas Schwitalla et al.
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Thomas Schwitalla et al.
Model code and software

Modified WRF source code and NCL scripts for the GMD manuscript "Near global scale high-resolution seasonal simulations with WRF" T. Schwitalla https://doi.org/10.5281/zenodo.3550622

Thomas Schwitalla et al.
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Short summary
Performing seasonal simulations on horizontal grid resolutions of a few kilometers over the entire globe remains challenging. We demonstrate the added value of simulating large-scale patterns and feedbacks at 3 km resolution compared to a coarser resolution forecast using the WRF numerical weather model on a latitude-belt domain. Results show an improvement of cloud coverage in the tropics, better representation of teleconnection, and improvements of precipitation patterns in different regions.
Performing seasonal simulations on horizontal grid resolutions of a few kilometers over the...
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