Quantitative precipitation estimation provided by weather radars plays a vital role in many hydrometeorological applications. The complexity of all the factors that contribute, on the one hand, to rainfall processes, and on the other hand, to the behavior of the energy beam emitted by the radar in its traverse through the atmosphere, mean that current estimates generally differ from the precipitation observed on surface. The aim of this study was to validate the SRI product (Surface Rain Intensity), which is a method of radar rainfall estimation that applies a correction considering a vertical profile of reflectivity (VPR). The VPR takes into account the freezing level height to make a correction in areas affected by the phenomenon known as “bright band”. Precipitation estimates obtained through this method were compared with other methods currently operational in the Meteorological Service of Catalonia in five representative episodes of convective and stratiform rainfall. In general, better results were obtained when compared with raingauge observations. Although this is a preliminary assessment that will have to be completed with more case studies, the results indicate good prospects for an operational use of this method.
pp. 25-39
DOI
10.3369/tethys.2010.7.03
Entire article
- - Andrieu, H. and Creutin, J. D., 1995: Identification of vertical profiles of radar reflectivity for hydrological applications using an inverse method. Part I: Formulation, J Appl Meteorol, 34, 240–258.
- - Bech, J., Rigo, T., Pineda, N., Segalà, S., Vilaclara, E., Sánchez-Diezma, R., Sempere, D., and Velasco, E., 2005: Implementation of the EHIMI software package in the weather radar operational chain of the Catalan Meteorological Service, Proc. 32nd International Conf. on Radar Meteorology, Albuquerque, NM, USA.
- - Bech, J., Gjertsen, U., and Haase, G., 2007: Modelling weather radar beam propagation and topographical blockage at northern high latitudes, Q J R Meteorol Soc, 133, 1191–1204, doi: 10.1002/qj.98.
- - Bech, J., Rigo, T., Pineda, N., Argemí, O., Bordoy, R., and Vilaclara, E., 2008: An updated description of the radar network of the Meteorological Service of Catalonia, 5th Eur. Radar Conf. ERAD2008, Finland.
- - Browning, K. A., 1980: Structure, mechanism and prediction of orographically enhanced rain in Britain. Orographic Effects in Planetary Flows, World Meteorological Organization, 85-114.
- - Collier, C. G., 1986: Accuracy of rainfall estimates by radar, Part 1: Calibration by telemetering raingauges, J Hydrol, 93, 207–223.
- - Cotton, W. R., George, R. L., Wetzel, P. J., and McAnelly, R. L., 1983: A long-lived mesoscale convective complex. Part I: The mountain-generated component, Mon Wea Rev, 111, 1983–1918, doi: 10.1175/1520-0493(1983)111<1893:ALLMCC>2.0.CO;2.
- - Cunningham, R. M., 1947: A different explanation of the “bright line”, Journal of Meteorology, 4, 163, doi: 10.1175/1520-0469(1947)004<0163:ADEOTB>2.0.CO;2.
- - Dinku, T., Anagnostou, E. N., and Borga, M., 2002: Improving radarbased estimation of rainfall over complex terrain, J Appl Meteorol, 41, 1163–1178.
- - Fabry, F. and Zawadzki, I., 1994: Long-term radar observations of the melting layer of precipitation and their interpretation, J Atmos Sci, 52, 838–851, doi: 10.1175/1520-0469(1995)052<0838:LTROOT>2.0.CO;2.
- - Franco, M., Sánchez-Diezma, R., and Sempere-Torres, D., 2006: Improvements in weather radar rain rate estimates using a method for identifying the vertical profile of reflectivity from volume radar scans, Meteorologische Zeitschrift, 15, 521–536, doi: 10.1127/0941-2948/2006/0154.
- - Germann, U., Galli, G., Boscacci, M., and Bolliger, M., 2006: Radar precipitation measurement in a mountainous region, Q J R Meteorol Soc, 132, 1669–1692, doi: 10.1256/qj.05.190.
- - Gjertsen, U., Sâlek, M., and Michelson, D. B., 2004: Gaugeadjustment of radar-based precipitation estimates, COST Action 717, ISBN-92-898-0000-3.
- - Joss, J. and Lee, R., 1995: The application of radar-gauge comparisons to operational precipitation profile corrections, J Appl Meteorol, 34, 2612–2630, doi: 10.1175/1520-0450(1995)034<2612:TAORCT>2.0.CO;2.
- - Joss, J. and Waldvogel, A., 1990: Precipitation measurements and hydrology, Amer Meteorol Soc, Battan memorial and 40th anniversary of the radar meteorology, pp. 577-606.
- - Koistinen, J., 1991: Operational correction of rainfall errors due to the vertical reflectivity profile, Amer Meteorol Soc, Preprints, 25th Int. Conf. on Radar Meteorology, Paris, France, 91-96.
- - Marshall, J. and Palmer, W., 1948: The distribution of raindrops with size, Journal of Meteorology, 5, 165–166, doi: 10.1175/1520-0469(1948)005<0165:TDORWS>2.0.CO;2.
- - Mittermaier, M. and Illingworth, A., 2003: Comparison of modelderived and radar-observed freezing-level heights: Implications for vertical reflectivity profile-correction schemes, Q J R Meteorol Soc, 129, 83–95.
- - Prohom, M. and Herrero, M., 2008: Cap a la creació d’una base de dades climàtica de Catalunya (segles XVIII a XXI), Tethys, 5, 3–11, doi: 10.3369/tethys.2008.5.01.
- - Rigo, T. and Llasat, M. C., 2004: A methodology for the classification of convective structures using meteorological radar: Application to heavy rainfall events on the Mediterranean coast of the Iberian Peninsula, Nat Hazards Earth Syst Sci, 4, 59–68.
- - Rinehart, R. E., 1997: Radar for Meteorologists, Rinehart Publications, Grand Forks, USA, 428pp.
- - Sánchez-Diezma, R., 2001: Optimización de la medida de lluvia por radar meteorológico para su aplicación hidrológica, PhD thesis, Universitat Politècnica de Catalunya.
- - Sánchez-Diezma, R., Sempere-Torres, D., Bech, J., and Velasco, E., 2002: Development of a hydrometeorological flood warning system (EHIMI) based on radar data, 2nd Eur. Radar Conf. European Meteorological Society. Copernicus Gesellschat, Delft, Holland.
- - Scovell, R., Lewis, H., Harrison, D., and Kitchen, M., 2008: Local vertical profile corrections using data from multiple scan elevations, Proceedings 5th Eur. Radar Conf. ERAD2008, Finland.
- - Sigmet, 2006: Iris Product and Display Manual. Chapter 2.14. SRI: Surface Rainfall Intensity, Sigmet, Inc., Westford, Boston, MA, USA.
- - Ulbrich, C. W. and Lee, L. G., 1998: Rainfall measurement error by WSR-88D radars due to variations in Z-R law parameters and the radar constant, J Atmos Ocean Technol, 16, 1017–1024, doi: 10.1175/1520-0426(1999)016<1017:RMEBWR>2.0.CO;2.
- - Vignal, B., Andrieu, H., and Creutin, J., 1998: Identification of vertical profiles of reflectivity from volume scan radar data, J Appl Meteorol, 38, 1214–1228, doi: 10.1175/1520-0450(1999)038<1214:IOVPOR>2.0.CO;2.
- - Vignal, B., Galli, G., and Joss, J., 2000: Three methods to determine profiles of reflectivity from volumetric radar data to correct precipitation, J Appl Meteorol, 39, 1715–1726, doi: 10.1175/1520-0450-39.10.1715.
- - Zawadzki, I., 1984: Factors affecting the precision of radar measurements of rain, Preprints, 22nd Int. Conf. on Radar Meteorology, Zurich, Switzerland, Amer Meteorol Soc, 251-256.