The variational adjoint method was applied to retrieving the turbulivity of the atmospheric Ekman boundary layer along with the regularization principle, The validity of the method was verified by using the idealized ...The variational adjoint method was applied to retrieving the turbulivity of the atmospheric Ekman boundary layer along with the regularization principle, The validity of the method was verified by using the idealized data, and then the turbulivity profile and the geostrophic wind profile were retrieved through it for real observational wind filed data.展开更多
Diagnosis is performed of a thunderstorm rainstorm event occurring in the summer of 1996 at Nanjing and numerical simulation undertaken in the context of hydrostatic equilibrium framework of MM5 as the fifth version o...Diagnosis is performed of a thunderstorm rainstorm event occurring in the summer of 1996 at Nanjing and numerical simulation undertaken in the context of hydrostatic equilibrium framework of MM5 as the fifth version of the PSU/NCAR mesoscale model.Analyses show that the rainstorm-associated thermal condition was the accumulation of unstable potential energy and the dynamic condition was vigorous convergence updrafts.And the simulation within the hydrostatic framework indicates the significant role of latent heat release in the rainstorm occurrence:that even for a 30 km grid spacing horizontally of great importance to the successful modeling of the meso-β event was a convection parameterization scheme that led to less rainfall in our run based only on its explicit version but to the prediction in closer agreement with the observed when its implicit version was used in combination:for the thunderstorm-accompanied torrential rain.the Grell scheme was superior to the version of Kuo and the improved Arakawa-Schubert parameterization scheme(Grell 1993:Anthese and Kuo 1987:Arakawa and Scherbt 1974:Grell et al,1991).Moreover,better results came from the simulation in the context of hydrostatic framework of the MM5 compared to those from the run within the nonhydrostatic equilibrium framework,a problem that awaits further efforts.展开更多
An atmosphere watersphere disaster reduction system(AWDRS), which is mainly aimed at serious disasters, such as heavy rainstorms, floods and typhoons, is presented. The system took us six years to establish. It has b...An atmosphere watersphere disaster reduction system(AWDRS), which is mainly aimed at serious disasters, such as heavy rainstorms, floods and typhoons, is presented. The system took us six years to establish. It has been put in real time operation and proved beneficial both economically and socially. AWDRS consists of five sub systems, i.e., Disaster Pre warning System(DPS), Disaster Reduction Information System(DRIS), Database & Disaster Assessment System(DDAS), Disaster Reduction Countermeasure System(DRCS) and Local Demonstrating System(LDS). Through several years of operation, the system has brought about an economic benefit of more than one billion yuan, as well as notable social benefits. Its establishment has laid a good foundation for the construction of China’s National Disaster Preventing & Reducing System(CNDPRS) and the setting up of China’s National Disaster Reduction Center(CNDRC). The system has been awarded a first prize of CAS and a national prize.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No:90411006).
文摘The variational adjoint method was applied to retrieving the turbulivity of the atmospheric Ekman boundary layer along with the regularization principle, The validity of the method was verified by using the idealized data, and then the turbulivity profile and the geostrophic wind profile were retrieved through it for real observational wind filed data.
基金National Natural Science Foundation of China under Grants 49375246.
文摘Diagnosis is performed of a thunderstorm rainstorm event occurring in the summer of 1996 at Nanjing and numerical simulation undertaken in the context of hydrostatic equilibrium framework of MM5 as the fifth version of the PSU/NCAR mesoscale model.Analyses show that the rainstorm-associated thermal condition was the accumulation of unstable potential energy and the dynamic condition was vigorous convergence updrafts.And the simulation within the hydrostatic framework indicates the significant role of latent heat release in the rainstorm occurrence:that even for a 30 km grid spacing horizontally of great importance to the successful modeling of the meso-β event was a convection parameterization scheme that led to less rainfall in our run based only on its explicit version but to the prediction in closer agreement with the observed when its implicit version was used in combination:for the thunderstorm-accompanied torrential rain.the Grell scheme was superior to the version of Kuo and the improved Arakawa-Schubert parameterization scheme(Grell 1993:Anthese and Kuo 1987:Arakawa and Scherbt 1974:Grell et al,1991).Moreover,better results came from the simulation in the context of hydrostatic framework of the MM5 compared to those from the run within the nonhydrostatic equilibrium framework,a problem that awaits further efforts.
文摘An atmosphere watersphere disaster reduction system(AWDRS), which is mainly aimed at serious disasters, such as heavy rainstorms, floods and typhoons, is presented. The system took us six years to establish. It has been put in real time operation and proved beneficial both economically and socially. AWDRS consists of five sub systems, i.e., Disaster Pre warning System(DPS), Disaster Reduction Information System(DRIS), Database & Disaster Assessment System(DDAS), Disaster Reduction Countermeasure System(DRCS) and Local Demonstrating System(LDS). Through several years of operation, the system has brought about an economic benefit of more than one billion yuan, as well as notable social benefits. Its establishment has laid a good foundation for the construction of China’s National Disaster Preventing & Reducing System(CNDPRS) and the setting up of China’s National Disaster Reduction Center(CNDRC). The system has been awarded a first prize of CAS and a national prize.
