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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:31 |
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Conference: Bucharest University Faculty of Physics 2016 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Study on the relationship between Lifted Condensation Level and weather radar quantitative precipitation estimates
Authors:
Cristian CRACIUN(1,2), Oana CATRINA(1,2)
Affiliation:
1) University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Bucharest, Magurele,Romania
2) National Meteorology Administration, Bucharest, Romania
E-mail
cristi_craciun_2009@yahoo.com
Keywords:
radar, gage, LCL
Abstract:
There are many challenges regarding weather radar-based quantitative precipitation estimations. One of the main concerns is the confidence level that a forecaster should have when taking the decision to issue warnings for dangerous weather phenomena that are located above different types of terrain. This paper aims to give a better understanding on why, at a certain distance from the radar and for a specific terrain structure, accumulated precipitation amounts are higher than radar estimates [1]. For the Transylvanian plateau, a map showing the spatial distribution of the correlation between radar amounts and gage amounts was made by using a radar dataset from a single polarization S-band Doppler radar, located in the central part of Romania, and a gage datasets that consist in daily accumulated precipitation, measured in a rain gage network within synoptic weather stations. The spatial distribution was made by transforming radar reflectivity data into rain-rate by using the Marshall-Palmer Z-R relation and comparing the two datasets using four objective methods [1]. Based on the spatial correlation distribution, some radar parameters, like beam-height and beam-width at certain distance from the radar, are calculated. Also, at gage location, Lifted Condensation Level (LCL) is determined from skew-t diagrams. The relation between radar beam spatial parameters and LCL shows that the differences and correlations between rain gage and radar data amounts have rather local significance over the studied area than general relevance.
References:
1. Craciun C., Catrina C., "An objective approach for comparing radar estimated and rain gage measured precipitation", paper accepted in Meteorological Applications
Acknowledgement:
We thank National Meteorological Administration for providing all the materials needed in this research.
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