Numerical Simulation and Analysis on the Phoenix Typhoon Rainstorm Using WRF
Rainstorm caused by the Typhoon Phoenix, between July 28th and 31st 2008, is studied by using the meso-scale numerical simulation model WRF and some NCEP reanalysis data of 1¡ã¡Á1¡ãwith 6h interval. Results show that, the distribution of the SLP, wind and rain belt was simulated successfully by the WRF model. The research shows that the strong upward motion at the 600 -700hPa and 100 -200hPa of 24¡ãN and two closure centers of near 21¡ãN-22¡ãN and 31¡ãN-33¡ãN at the high troposphere induced convective cloud cluster to develop.
Variational Assimilation of AMSU Data and Its Application to Numerical Simulation of Heavy Rainfall
GRAPES three-dimensional variational data assimilation system is used in this paper to assimilate AMSU data,then a process of a heavy rainstorm on 4~5 July 2003 is simulated through the WRF mesoscal model(version 2.0),in order to find the impact of AMSU data on numerical forecast of heavy rainfall in our country.By comparing and analyzing the results of assimilation and simulation respectively,the main conclusions to be drawn from this paper are as follows:(1) AMSU-A data contributes mainly to adjusting the temperature of initial fields,and AMSU-B data adjusts its humidity more distinctly;(2) From the adjusting extent to the results of hard rain simulation,the contribution of AMSU-B data is superior to one of AMSU-A data,and the effect of AMSU-A data seems to be less;(3) After assimilating AMSU-A/B data synchronously,the results of torrential rain simulation are improved more obviously than that of only using AMSU-A data or AMSU-B data in the areas and intensity of heavy rains.The analyses above show that AMSU data may advance the quality of the initial fields and increase the accuracy of heavy rainfall NWP in our country.
Target of inhibition by the anti-lipogenic antibiotic cerulenin of sterol synthesis in yeast.
Abstract The antibiotic cerulenin inhibited the incorporation of 14 C-acetyl-CoA by 67% at a concentration of 9 × 10 −6 M but not that of 14 C-HMG-CoA into the non-saponifiable fraction in a cell-free extract of Saccharomyces cerevisiae . Cerulenin markedly inhibited the activity of partially purified HMG-CoA synthase. No inhibition of acetoacetyl-CoA thiolase activity was observed in the same preparation of HMG-CoA synthase. Therefore, cerulenin inhibition of overall sterol synthesis may be accounted for by the specific inhibition of HMG-CoA synthase activity.