Parametrization of Planetary Boundary-Layer Height with Helicity and Verification with Tropical Cyclone Prediction

摘要: To reduce the discrepancy between simulated and observed tropical cyclones, we consider a new parametrization scheme for planetary boundary-layer (PBL) height based on helicity, intended to provide an improved description of overall helical structures cyclone PBL in numerical model. This was preliminarily tested Yonsei University (YSU) integrated within National Center Atmospheric Research Weather Forecasting Based verification track simulations seven cyclones that made landfall over China, Morakot (2009) selected further evaluation scheme. Compared with original Richardson number (Ri), elevated associated intense convection, which is consistent observation. Importantly, simulation rainfall by modulating environment convection evolution. Furthermore, 2-m temperature land at night, are frequently overestimated YSU scheme, were using Because its effects evolution, intensity