Abstract
Most of the current longer term forecasts are performed on horizontal grid resolutions of 15–50 km due to lack of computational resources. As this resolution can be too coarse to represent certain meteorological features, often limited area models (LAM) on higher resolutions are applied for the region of interest. They require external boundary conditions from a coarser driving model at the edges of the model domain. As this can deteriorate the results due to e.g. cutting through an intense storm, it is desirable to have less boundaries to allow the model to develop its own internal climate. In this study we present a high-resolution latitude belt simulation for half of the northern hemisphere. The horizontal resolution is 0.03∘ spanning a belt between 20∘ N and 65∘ N. The domain encompasses 12000∗1500∗57 grid boxes and is driven by the ECMWF operational analysis. The simulation period was July and August 2013. First results are promising as on average, the simulation of key meteorological variables like temperature, humidity, and wind is close to the ECMWF operational analysis. One of the highlights was the simulation of typhoon Soulik with 10 days lead time.
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Acknowledgements
This work was greatly supported by U. Küster, T. Beisel, and T. Bönisch from HLRS. We also achieved valuable technical support from S. Andersson and S. Dieterich from Cray Inc. We are also grateful to ECMWF for providing ECMWF analysis data from the operational model.
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Schwitalla, T., Warrach-Sagi, K., Wulfmeyer, V. (2015). High-Resolution Latitude Belt Simulation with the Weather Research and Forecasting Model. In: Resch, M., Bez, W., Focht, E., Kobayashi, H., Qi, J., Roller, S. (eds) Sustained Simulation Performance 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-20340-9_15
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DOI: https://doi.org/10.1007/978-3-319-20340-9_15
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