Abstract
Abstract. In this study, the non-iteration dimensional-split semi-Lagrangian (NDSL) advection scheme is applied to the National Centers for Environmental Prediction (NCEP) Regional Spectral Model (RSM) to alleviate the Gibbs phenomenon. The Gibbs phenomenon is a problem wherein negative values of positive-definite quantities (e.g., moisture and tracers) are generated by the spectral space transformation in a spectral model system. To solve this problem, the spectral prognostic specific humidity and radioactive tracer advection scheme is replaced by the NDSL advection scheme, which considers advection of tracers in a grid system without spectral space transformations. A regional version of the NDSL is developed in this study and is applied to the RSM. Idealized experiments show that the regional version of the NDSL is successful. The model runs for an actual case study suggest that the NDSL can successfully advect radioactive tracers (iodine-131 and cesium-137) without noise from the Gibbs phenomenon. The NDSL can also remove negative specific humidity values produced in spectral calculations without losing detailed features.
Reference32 articles.
1. Aranami, K., Davies, T., and Wood, N.: A mass restoration scheme for limited-area models with semi-Lagrangian advection, Q. J. R. Meteor. Soc., 141, 1795–1803, 2015.
2. Bourke, W.: An Efficient, One-Level, Primitive-Equation Spectral Model, Mon. Weather Rev., 100, 683–689, 1972.
3. Chang, E.-C. and Hong, S.-Y.: Projected climate change scenario over East Asia by a regional spectral model, J. Korean Earth Sci. Soc., 32, 770–783, 2011.
4. Chen, Q.-S. and Kuo, Y.-H.: A harmonic-sine series expansion and its application for partitioning and reconstruction problems in a limited area, Mon. Weather Rev., 120, 91–112, 1992.
5. Chino, M., Nakayama. H., Nagai. H., Terada. H., Katata. G., and Yamazawa. H.: Preliminary estimation of release amounts of 131I and 137Cs accidentally discharged from the Fukushima Daiichi Nuclear Power Plant into the atmosphere, J. Nuclear Sci. Tech., 48, 1129–1134, 2011.
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