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Raindrop Size Distribution Over Northeastern Coast of Brazil
Tenorio Ricardo Sarmento,Kwon Byung-Hyuk,Silva Moraes Marcia Cristina da The Korea Institute of Information and Commucation 2006 Journal of information and communication convergen Vol.4 No.1
Precipitation measurement with ground-based radar needs an information of the raindrop size distribution (RSD) characteristics. A 10-month dataset was collected in tropical Atlantic coastal zone of northeastern Brazil where the weather radar was installed. The number of drop was mainly recorded in 300 - 500 drop $mm^{-3}$, of which the maximum was registered around 1.1 mm drop diameter.
Z-R Relationships for a Weather Radar in the Eastern Coast of Northeastern Brazil
Tenorio Ricardo Sarmento,Kwon Byung-Hyuk,Silva Moraes Marcia Cristina da The Korea Institute of Information and Commucation 2006 Journal of information and communication convergen Vol.4 No.1
A disdrometer has been used to determine Z-R relationships for the weather radar, which is unique coastal radar operating regularly in western tropical south Atlantic. Rainfall rates were divided into the stratiform rain and the convective rain on the basis of $10\;mm\;h^{-1}$. The Z-R relationship for the stratiform class was similar to the general one since the convective clouds did not developed and two classes of the rain rate were mixed.
Tropical Rainfall Characteristics at the Eastern Coast of South America
Ricardo Sarmento Tenório,권병혁,이규원,Marcia Cristina da Silva Moraes 한국기상학회 2010 Asia-Pacific Journal of Atmospheric Sciences Vol.46 No.3
Z-R relationships were developed for the Eastern Coast of Northeastern Brazil (NEB) using rainfall raindrop size distribution (RSD)data collected with a disdrometer RD-69 in the Campus of the Universidade Federal de Alagoas (UFAL: The Federal University of Alagoas) in Maceió in 2001. The RSD was stratified by rainfall rate classes. It is found that the RSD are clearly dependent on the parameters of the analytical distribution functions are, and show a marked monthly variability. The parameters of the frequency distributions are dependent on the rain rate (R). The forms of RSDs are similar to previous studies but the amount of droplets is not in each one very strongly. This may be possible due to the short period of data collection or to the intraseasonal rainfall variability. The general relationship for the Eastern Coast of NEB was found to be Z = 176.5 R1.29, with correlation coefficient equal to 0.83. This equation is in accordance with the ones for stratiform rain reported in the literature. We found that the convective rain observed is produced by convective cells imbedded into stratiform cloud layers. However, when separating stratiform and convective rainfall we found that the linear coefficient of the Z-R relation is significantly smaller for convective rainfall than for stratiform one (65 and 167 respectively), but the exponential coefficient is higher for convective than for stratiform (1.69 and 1.26 respectively).