大气科学2017，Vol.41Issue(3)：421-436,16.DOI:10.3878/j.issn.1006-9895.1610.16105
风云三号微波观测资料的海雾同化模拟
Sea Fog Simulation with Assimilation of FY-3A Microwave Data
摘要
Abstract
Inappropriate description of physical processes within the boundary layer and errors in the initial condition are two primary reasons for the low accuracy of sea fog simulation.In order to obtain more satellite data assimilation and simulation experience for improving the initial condition,the present paper investigates the impact of assimilation of FY-3A MicroWave Humidity Sounding (MWHS) and MicroWave Temperature Sounding (MWTS) data derived from optimal channels.The WRF-3DVar (Weather Research and Forecasting-Three-dimensional variational data assimilation) is applied to assimilate these data that have been quality controlled and bias corrected in simulation and prediction experiments of sea fog over the Yellow Sea and Bohai.Analysis of the increments of temperature and relative humidity from the assimilation system over the sea fog region detected by Geo-satellite indicates that differences in the model capability for sea fog simulation and various types of sea fog that are related to the environmental condition have significant influences on the assimilation effects,i.e.the model performance is greatly improved by assimilation for the simulation of cold-type advection sea fog,which the model already has a strong simulation ability.However,for warm-type sea fog that involves non-typical mixing processes,data assimilation results in little changes in the simulation.In order to determine the reasons,direct comparisons between the simulated temperature and relative humidity at a sea fog covered grid and standard rawinsonde observations nearby,and analysis of the evolution of the temperature and relative humidity and their increments from assimilation at all sea fog covered grids,are carried out.The results show that the increments from assimilation at the cold-type sea fog covered grids can make up the deviations between observations and simulation by reducing temperature and increasing relative humidity;meanwhile,the atmospheric water vapor and liquid water contents also appear to be adjusted by assimilation.Possible increments and adjustment in the boundary layer by assimilation are also found in the vertical direction.However,similar phenomena and other beneficial signs of adjustment are not found during the warm-type sea fog period.关键词
卫星资料/数据同化/海雾模拟/微波湿度计(MWHS)/微波温度计(MWTS)/边界层Key words
Satellite data/Data assimilation/Sea fog simulation/MicroWave Humidity Sounding (MWHS)/MicroWave Temperature Sounding (MWTS)/Boundary layer分类
天文与地球科学引用本文复制引用
吴晓京,朱江,王曦,杨冰韵..风云三号微波观测资料的海雾同化模拟[J].大气科学,2017,41(3):421-436,16.基金项目
国家自然科学基金项目41075057、41675110 （）
National Natural Science Foundation of China (Grants 41075057 and 41675110) （Grants 41075057 and 41675110）
