The Development Of A Single Column Model For Planetary Boundary Layer And The Preliminary Study Of Numerical Experiments

Single-column model is one of the important means to study physical process parameterization scheme in the climate model.It can better reveal the characteristics and essence of these physical processes.This paper applied single-column model into ocean planet boundary layer research,aiming at the existing problems in the calculation of single column model.It used the finite element method and the Doolittle algorithm to solve the model equations and framework scheme.The paper simulated the planetary boundary layer of the south China sea and compared with ERA-Interim reanalysis data.Then it discussed the change characteristics of Marine planetary boundary layer preliminary.The results showed that:Single-column model framework and computing solutions by finite element method and the Doolittle algorithm,compared with the original framework and calculation scheme it increased about 51 times.It better solved the problem of the calculation speed and provided a reference for the application of the higher order closure schemes in the large scale application of the model.This paper proposed a new framework calculation scheme.The simulation results of temperature,humidity and wind speed have good consistency compared with the ERA-Interim data,and better reflect the layer structure of boundary layer.Paper puts forward the new framework of calculation,the results of the simulation of the temperature,specific humidity,wind speed compared with the ERA-Interim data have good consistency,and better reflect the stratification structure characteristics of the boundary layer.The simulation of the long wave net radiation flux increases with increasing altitude when there is no cloud.It affected by the low altitude atmosphere.It has a maximum value afternoon,and reaching the lowest value about 14:00.Affected by the cloud,the long wave net radiation flux change differently significant with no clouds.Simulation of short-wave net radiation flux exists obvious diurnal variation.It affected by the low altitude atmosphere when cloudless.It has a maximum value afternoon,and reaching the highest value about 14:00.Affected by the cloud,the shot wave net radiation flux change differently significant with no clouds.Simulation of the specific humidity value influenced by evaporation.In the condition of clear sky,the specific humidity lifted over time.Its value change rate is larger in the initial period of cloud development,with the change of height of delay phenomenon.The simulation results of liquid water increased gradually after sunrise,and changed little after the cloud was formed.As results,the new framework calculation scheme can well simulate planetary boundary layer characteristics.