Product application of Doppler weather radar

The products of the new generation Doppler weather radar include basic products and derivative products. There are three basic products: reflectivity factor, average radial velocity and spectral width. The reflection coefficient describes a complete 360 &:ordm；; The echo intensity data of azimuth scanning, and the data grade is represented by dBZ. Radar operators can rely on reflectivity products to determine the echo intensity, determine the intensity and structure of storm and rainstorm (snow) area, and also determine the movement and future trend of precipitation echo according to the change of reflectivity factor with time. The average radial velocity represents the whole 360 &:ordm；; Azimuth scans the radial velocity data, which is the component of the moving velocity of the object parallel to the radial direction of the radar. Radial velocity has many direct applications, which can derive the atmospheric structure and storm structure, and can help to generate, adjust and update the high-altitude analysis map. The average radial velocity product has two limitations: first, the radial velocity of the wind perpendicular to the radar beam is expressed as 0; Second, distance folding and incorrect speed deblurring. Spectral width data actually refers to velocity spectral width data, which is a measure of velocity dispersion. It can provide the observation of the average radial velocity change caused by wind shear, turbulence and velocity sample quality, and can also be used to determine the position of the boundary (density discontinuity), estimate the turbulence size and check whether the radial velocity is reliable. Derivative products are products obtained by radar product generation system (RPG) through meteorological algorithm based on basic data. The more important products are the average radial velocity map relative to the storm, the average radial velocity region relative to the storm, strong weather analysis, combined reflectivity factor, echo top, profile products and so on. So far, the most commonly used products are basic products, and export products can only play the role of tips and reference.