Abstract
It has always been a challenge to compare data that is collected from the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) for varying scan angles. Intercomparisons between ground radar and spaceborne radar on a point-by-point basis can be a difficult task. Errors result from the mismatch between ground radar and spaceborne radar resolution volume, spatial alignment, and operating frequencies as well as the limited number of the data set collected instantaneously by both instruments. Differences in viewing aspects and resolution that result from the measurement of return signals from different volumes of the precipitation medium contribute to the intercomparison error. Searching for a model profile from one of the atmospheric phenomenon that has unique characteristics can help to adjust the error in the collected data and can serve as an intercomparison data set. The TRMM-PR produces unprecedented high-resolution vertical profiles of precipitation that can be used in study the characteristics of the precipitation. One of the most widely known radar signatures is Bright band. A study of the characteristics of the region of the bright band from TRMM- PR vertical profile measurements for one year on a global scale indicates that while bright band height varies widely, the distribution of bright band structure does not vary around the globe (1). This result is examined in this paper by comparing the vertical profile of reflectivity at bright band region using bright band height as a common reference from different regions around the globe. The results show that the average profile of the reflectivity vertical profile of stratiform rain type with bright band using bright band height as a common reference around the globe has unique profile and does not change around the globe for a large data set. This unique profile can be used to adjust the radar observation error due to different parameters. This result can be used to adjust the effect of the scanning cross-track at angle far from the nadir-ray by intercomparison the model profile at the nadir ray with other rays profile at the scan edge.
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