Abstract
To date, seasonal forecasts are often performed by applying horizontal resolutions of 75–150 km due to lack of computational resources and associated operational constraints. As this resolution is too coarse to represent fine scale structures impacting the large scale circulation, a convection permitting (CP) resolution of less than 4 km horizontal resolution is required. Most of the simulations are carried out as limited area model (LAMs) and thus require boundary conditions at all four domain boundaries. In this study, the Weather Research and Forecasting (WRF) model is applied in a latitude belt set-up in order to avoid the application of zonal boundaries. The horizontal resolution is 0.03\(^{\circ }\) and 0.45\(^{\circ }\) spanning a belt between 65\(^{\circ }\)N and 57\(^{\circ }\)S encompassing 12000 * 4060 * 57 grid boxes for the high-resolution domain. The simulations are driven by ECMWF analysis and high resolution SST data from multiple sources. The simulation period was February 1st–July 1st, 2015 which was a strong El Niño period.
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The required computation time for the WRF simulations was kindly provided by HLRS. We also highly appreciate the valuable technical support from HLRS and Cray.
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Schwitalla, T., Wulfmeyer, V., Warrach-Sagi, K. (2019). Seasonal Simulation of Weather Extremes (WRFXXXL). In: Nagel, W., Kröner, D., Resch, M. (eds) High Performance Computing in Science and Engineering ' 18. Springer, Cham. https://doi.org/10.1007/978-3-030-13325-2_24
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