Abstract
This paper investigates spatial and temporal distributions of the microphysical properties of precipitating stratiform clouds based on Doppler spectra of rain particles observed by an L-band profiler radar. The retrieval of raindrop size distributions (RSDs) is accomplished through eliminating vertical air motion and isolating the terminal fall velocity of raindrops in the observed Doppler velocity spectrum. The microphysical properties of raindrops in a broad stratiform region with weak convective cells are studied using data collected from a 1320-MHz wind profiler radar in Huayin, Shaanxi Province on 14 May 2009. RSDs and gamma function parameters are retrieved at altitudes between 700 and 3000 m above the surface, below a melting layer. It is found that the altitude of the maximum number of raindrops was closely related to the surface rain rate. The maximum number of large drops was observed at lower altitudes earlier in the precipitation event but at higher altitudes in later periods, suggesting decreases in the numbers of large and medium size raindrops. These decreases may have been caused by the breakup of larger drops and evaporation of smaller drops as they fell. The number of medium size drops decreased with increasing altitude. The relationship between reflectivity and liquid water content during this precipitation event was Z = 1.69×104 M 1.5, and the relationship between reflectivity and rain intensity was Z = 256I 1.4.
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Allen, B. W., D. J. Gottas, E. T. Strem, et al., 2002: An automated bright band height detection algorithm for use with Doppler radar spectral moments. J. Atmos. Oceanic Technol., 19, 687–697.
Chen Baojun, Li Zihua, and Liu Jicheng, 1998: Model of raindrop size distribution in three types of precipitation. Acta Meteor. Sinica, 56, 506–512. (in Chinese)
Gunn, R., and G. D. Kinzer, 1949: The terminal velocity of fall for water droplets in stagnant air. J. Meteor., 6, 243–248.
Hildebrand, P. H., and R. S. Sekhon, 1974: Objective determination of the noise level in Doppler spectra. J. Appl. Meteor., 13, 808–811.
Huang Yu, Ruan Zheng, Ge Runsheng, et al., 2011: Study on bright band detection using wind profiler radar. Plateau Meteor., 30, 1376–1383. (in Chinese)
Kim, D.-K., K. R. Knupp, and C. R. Williams, 2009: Airflow and precipitation properties within the stratiform region of tropical storm gabrielle during landfall. Mon. Wea. Rev., 137, 1954–1971.
Kirankumar, N. V. P., T. N. Rao, B. Radhakrishna, et al., 2008: Statistical characteristics of raindrop size distribution in southwest monsoon season. J. Appl. Meteor. Climatol., 47, 576–590.
Kobayashi, T., and A. Adachi, 2005: Retrieval of arbitrarily shaped raindrop size distributions from wind profiler measurements. J. Atmos. Oceanic Technol., 22, 433–442.
Liao Fei, Deng Hua, Wan Qilin, et al., 2011: Observation studies on characteristics of raindrop size distribution of two typical summer thunderstorm cases in the Pearl River delta. Plateau Meteor., 30, 798–808. (in Chinese)
Liu Hongyan and Lei Hengchi, 2006: Characteristics of rain from stratiform versus convective cloud based on the surface raindrop data. J. Atmos. Sci., 30, 693–702. (in Chinese)
Lucas, C., A. D. MacKinnon, R. A. Vincent, et al., 2004: Raindrop size distribution retrievals from a VHF boundary layer profiler. J. Atmos. Oceanic Technol., 21, 45–60.
Maguire, W. B., II, and S. K. Avery, 1994: Retrieval of raindrop size distributions using two Doppler wind profilers: Model sensitivity testing. J. Appl. Meteor., 33, 1623–1635.
Mallet, C., and L. Barthes, 2009: Estimation of gamma raindrop size distribution parameters: Statistical fluctuations and estimation errors. J. Atmos. Oceanic Technol., 26, 1572–1584.
Radhakrishna, B., and T. N. Rao, 2009: Multipeak raindrop size distribution observed by UHF/VHF wind profilers during the passage of a mesoscale convective system. Mon. Wea. Rev., 137, 976–990.
Rao, T. N., N. V. P. Kirankumar, B. Radhakrishna, et al., 2008: Classification of tropical precipitating systems using wind profiler spectral moments. Part I: Algorithm description and validation. J. Atmos. Oceanic Technol., 25, 884–897.
Schafer, R., S. Avery, P. May, et al., 2002: Estimation of rainfall drop size distributions from dual-frequency wind profiler spectra using deconvolution and a nonlinear least squares fitting technique. J. Atmos. Oceanic Technol., 19, 864–874.
Sharma, S., M. Konwar, D. K. Sarma, et al., 2009: Characteristics of rain integral parameters during tropical convective, transition, and stratiform rain at Gadanki and its application in rain retrieval. J. Appl. Meteor. Climatol., 48, 1245–1266.
Shupe, M. D., P. Kollias, P. O. G. Persson, et al., 2008: Vertical motions in arctic mixed-phase stratiform clouds. J. Atmos. Sci., 65, 1304–1322.
Steiner, M., H. Richner, and S. E. Yuter, 1995: Climatological characterization of three-dimensional storm structure from operational radar and rain gauge data. J. Appl. Meteor., 34, 1978–2007.
Ulbrich, C. W., and P. B. Chilson, 1994: Effects of variations in precipitation size distribution and fall speed law parameters on relations between mean Doppler fall speed and reflectivity factor. J. Atmos. Oceanic Technol., 11, 1656–1663.
Wang Xiaolei, Ruan Zheng, Ge Runsheng, et al., 2010: A study of drop-size distribution in precipitation cloud from wind profile radar. Plateau Meteor., 29, 498–505. (in Chinese)
White, A. B., D. J. Gottas, E. T. Strem, et al., 2002: An automated bright band height detection algorithm for use with Doppler radar spectral moments. J. Atmos. Oceanic Technol., 19, 687–697.
Williams, C. R., W. L. Ecklund, and K. S. Gage, 1995: Classification of precipitating clouds in the tropics using 915-MHz wind profilers. J. Atmos. Oceanic Technol., 12, 996–1012.
—, —, P. E. Johnston, et al., 2000: Cluster analysis techniques to separate air motion and hydrometeors in vertical incident profiler observations. J. Atmos. Oceanic Technol., 17, 949–962.
Zhang Peichang, Du Bingyu, and Dai Tiepi, 2000: Radar Meteorology. China Meteorological Press, 511 pp. (in Chinese)
Zhong Liujun, Ruan Zheng, Ge Runsheng, et al., 2010: Calibration method of echo intensity of wind profile radar. J. Appl. Meteor. Sci., 21, 598–605. (in Chinese)
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Supported by the National Natural Science Foundation of China (41075023), China Meteorological Administration Special Public Welfare Research Fund (GYHY200906039 and GYHY201206042), and State Key Laboratory of Severe Weather Research Fund.
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Ruan, Z., Ming, H., Ma, J. et al. Analysis of the microphysical properties of a stratiform rain event using an L-Band profiler radar. J Meteorol Res 28, 268–280 (2014). https://doi.org/10.1007/s13351-014-3091-x
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DOI: https://doi.org/10.1007/s13351-014-3091-x