A study on the relation between terminal velocity and VHF backscatter from precipitation particles using the Chung-Li VHF radar

Yen Hsyang Chu, Shun Peng Shih, Ching Lun Su, Kan Lin Lee, Tzer Horng Lin, Wei Chung Liang

研究成果: 雜誌貢獻期刊論文同行評審

7 引文 斯高帕斯(Scopus)

摘要

The relationships between the mean Doppler terminal velocities VT of the hydrometeors with different phases and the range-corrected VHF backscatter P from the corresponding precipitation particles are investigated by using the Chung-Li VHF radar. The radar precipitation data employed for the analysis were taken from four independent experiments conducted on different weather conditions. They show that the observed α and β values in the power-law approximation VT = αPβ above the melting layer are generally smaller than those below the layer, while in the bright band the values of β (α) are enormously smaller (greater) than those above and below the bright band. Theoretical analysis shows that the mathematical relationship between α and β can be approximated very well by a simple exponential function, which is in excellent agreement with the observations. A new method for estimating the coefficient A and exponent B in the fall speed-diameter relationship V(D) = ADB with respect to still air on the basis of the theoretical relation between α and β is also proposed. A comparison of the estimations of A and B with those reported in the literature indicates that the former are smaller than the latter. The authors believe that the difference in the two is due to the different types of the clouds producing the precipitation. In addition, it is found that the value of A is proportional to the height of the 0°C isotherm, implying that the air temperature plays a role in establishing the relationship between the fall speed and the diameter of the hydrometeors.

原文???core.languages.en_GB???
頁(從 - 到)1720-1729
頁數10
期刊Journal of Applied Meteorology
38
發行號12
DOIs
出版狀態已出版 - 12月 1999

指紋

深入研究「A study on the relation between terminal velocity and VHF backscatter from precipitation particles using the Chung-Li VHF radar」主題。共同形成了獨特的指紋。

引用此