| Gravity wave is a stratospheric common medium-sized wave,playing a key role in global meteorology,climatology,chemistry,and high-level atmospheric and low-level atmospheric dynamics.The spatial and temporal distribution characteristics and propagation characteristics of gravity waves in the stratosphere are studied by using AMSU-A and MWTS microwave observation data in this paper.The differences of AMSU-A and MWTS in monitoring gravity wave are compared and analyzed.At the same time,five typical storms with the gravity wave events in China are analyzed,using AIRS data and ECMWF ERA-interim reanalysis data.And the WRF model was used to study the rainstorm process in Rushan City,Shandong Province.Meanwhile,the propagation characteristics of stratospheric gravity waves caused by heavy rain and the possible effects of gravity wave uploading on the development of heavy rain are discussed.The microwave channels of the oxygen absorption band near 50 ~ 60 GHz and118.75 GHz of FY-3C satellite can be used to monitor the atmospheric temperature of the near space.Study for analyzing the advantages of the FY-3C microwave sounder in the observations of the strong gravity wave(GW)disturbance in the stratosphere is conducted.The ability of different channels to monitor the stratospheric atmospheric temperature disturbance is analyzed,based on the statistical results of strong GWs disturbances in the stratosphere.Then,the similarities and differences between the FY-3C microwave temperature sounder and foreign similar instruments in observing stratospheric GWs perturbations are analyzed,and the ability of the same atmospheric microwave channels on different satellites to analyze the stratospheric GWs is discussed.In this paper,the frequency distribution of global stratospheric GWs disturbances in the winter of 2012(December,January,February)and the summer of 2014(June,July,August)is counted.The observation and analysis of a stratospheric GWs process from7 th to 11 th January 2014 in Greenland shows that the 50 ~ 60 GHz and 118.75 GHz bands of the FY-3C microwave sounder can be used to obtain the atmospheric temperature disturbances at different heights of the stratosphere.And the detection capability of 50~60GHz band is significantly better than the latter.The comparison between AMSU-A of METOP-B and MWTS-Ⅱ of FY-3C via a GWs process of the stratosphere near the Labrador Peninsula on 11 th January 2014 shows that MWTS-Ⅱcan reveal finer stratospheric gravity waves,and the intensity of the disturbance from MWTS-Ⅱ is also stronger.Finally,the analysis of the same channel of different platform for a GWs process near the Andes on 10 th August 2014 shows that the multi-platform observations can further improve the temporal resolution of monitoringthe stratospheric GWs.In order to analyze the characteristics of the deep convection-induced stratospheric gravitaty waves in Chinese continental region,five typical heavy rain events and the stratospheric gravitaty waves arised from them occurred from July 2007 to August 2011 in the terrestrial latitude region of China are analyzed,using the Aqua satellite hyperspectral infrared detector AIRS Combined with ERA-interim high-altitude background data and S-transform wavelet analysis method.And the possible influence of gravity wave uploading on rainstorm development is discussed.In addition,the stratospheric gravitaty wave process,which is observed by the satellite Aqua / AIRS and accompanied with the heavy rainstorm process on July 25 th,2011 in Rushan,is simulated using the mesoscale numerical model WRF.The analysis of the vertical velocity field and the temperature disturbance field of the mode output show that the structure of the torrential wave in the stratosphere is mainly concentrated in the east of the precipitation cloud system,and the horizontal influence range is more than 1000 km.With the increase of the height,the structure of the torrential wave tends to close,and the wave amplitude is also significantly enhanced.In addition,the analysis of the vertical velocity profile shows that the gravity wave transmit eastward against the background wind field during the uploading process,and the fluctuation shapes are different at different height.Then,the results of power spectrum analysis based on three-dimensional Fourier transform(FFT)shows that the stratospheric gravity wave induced by the storm at 35 km has the period of approximately 7 ~ 20 h,the horizontal wavelength of about 1000 km and the vertical wavelength of 5 ~ 10 km.Finally,the parameterized forcing in gravity wave uploading process is quantifiably reflected by analyzing the vertical transport of momentum flux reflects. |
