MICROPHYSICAL CHARACTERISTICS OF THE RAINDROP SIZE DISTRIBUTION IN TYPHOON MORAKOT (2009)

CHEN Bao-jun; WANG Yuan; MING Jie

doi:10.3969/j.issn.1006-8775.2012.02.006

Abstract:

Microphysical characteristics of the raindrop size distribution (RSD) in Typhoon Morakot (2009) have been studied through the PARSIVEL disdrometer measurements at one site in Fujian province, China during the passage of the storm from 7 to 10 August 2009. The time evolution of the RSD reveals different segments of the storm. Significant difference was observed in the microphysical characteristics between the outer rainband and the eyewall; the eyewall precipitation had a broader size distribution (a smaller slope) than the outer rainband and eye region. The outer rainband and the eye region produced stratiform rains while the eyewall precipitation was convective or mixed stratiform-convective. The RSD was typically characterized by a single peak distribution and well represented by the gamma distribution. The relations between the shape (μ) and slope (Λ) of the gamma distribution and between the reflectivity (Z) and rainfall rate (R) have been investigated. Based on the NW–CDm relationships, we suggest that the stratiform rain for the outer rainband and the eye region was formed by the melting of graupel or rimed ice particles, which likely originated from the eyewall clouds.

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CHEN Bao-jun, WANG Yuan, MING Jie. MICROPHYSICAL CHARACTERISTICS OF THE RAINDROP SIZE DISTRIBUTION IN TYPHOON MORAKOT (2009) [J]. Journal of Tropical Meteorology, 2012, 18(2): 162-171, https://doi.org/10.3969/j.issn.1006-8775.2012.02.006

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MICROPHYSICAL CHARACTERISTICS OF THE RAINDROP SIZE DISTRIBUTION IN TYPHOON MORAKOT (2009)

Key Laboratory of Mesoscale Severe Weather/MOE, and School of Atmospheric Sciences, Nanjing University, Nanjing 210093 China

Received Date: 2011-09-30

Rev Recd Date: 2012-02-15

Abstract: Microphysical characteristics of the raindrop size distribution (RSD) in Typhoon Morakot (2009) have been studied through the PARSIVEL disdrometer measurements at one site in Fujian province, China during the passage of the storm from 7 to 10 August 2009. The time evolution of the RSD reveals different segments of the storm. Significant difference was observed in the microphysical characteristics between the outer rainband and the eyewall; the eyewall precipitation had a broader size distribution (a smaller slope) than the outer rainband and eye region. The outer rainband and the eye region produced stratiform rains while the eyewall precipitation was convective or mixed stratiform-convective. The RSD was typically characterized by a single peak distribution and well represented by the gamma distribution. The relations between the shape (μ) and slope (Λ) of the gamma distribution and between the reflectivity (Z) and rainfall rate (R) have been investigated. Based on the NW–CDm relationships, we suggest that the stratiform rain for the outer rainband and the eye region was formed by the melting of graupel or rimed ice particles, which likely originated from the eyewall clouds.

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[1]	HONG C C, LEE M Y, HSU H H, et al. Role of submonthlydisturbance and 40-50 day ISO on the extreme rainfall eventassociated with Typhoon Morakot (2009) in Southern Taiwan[J]. Geophys. Res. Lett., 2010, 37, L08805,doi:10.1029/2010GL042761.
[2]	ZHANG F, WENG Y, KUO Y-H, et al. Predicting typhoonMorakot's catastrophic rainfall with a convection-permittingmesoscale ensemble system [J]. Wea. Forecasting, 2010, 25(6):1816-1825.
[3]	CHIEN F C, KUO H C. On the extreme rainfall of TyphoonMorakot (2009) [J]. J. Geophys. Res., 2011, 116, D05104,doi:10.1029/2010JD015092.
[4]	LIU C C, LIU G R, LIN T H, et al. Accumulated rainfallforecast of Typhoon Morakot (2009) in Taiwan using satellite data [J]. J. Meteor. Soc. Japan, 2010, 88(5): 785-798.
[5]	EBERT E E, TURK M, KUSSELSON S J, et al. Ensembletropical rainfall potential (eTRaP) forecasts [J]. Wea.Forecasting, 2011, 26(2): 213-224.
[6]	NGUYEN H V, CHEN Y L. High-resolution initializationand simulations of Typhoon Morakot (2009) [J]. Mon. Wea.Rev., 2011, 139(5): 1463-1691.
[7]	ATLAS D, ULBRICH C W. Drop size spectra and integralremote sensing parameters in the transition from convective tostratiform rain [J]. Geophys. Res. Lett., 2006, 33, L16803,doi:10.1029/2006GL026824.
[8]	CHAPON B, DELRIEU G, GOSSET M, et al. Variability ofrain drop size distribution and its effect on the Z�CR relationship:A case study for intense Mediterranean rainfall [J]. Atmos. Res.,2008, 87(1): 52-65.
[9]	MARTNER B E, YUTER S E, WHITE A B, et al. Raindropsize distributions and rain characteristics in California coastalrainfall for periods with and without a radar bright band [J]. J.Hydrometeor., 2008, 9(3): 408-425.
[10]	MOUMOUNI S, GOSSET M, HOUNGNINOU E. Mainfeatures of rain drop size distributions observed in Benin, WestAfrica, with optical disdrometers [J]. Geophys. Res. Lett., 2008,35, L23807, doi:10.1029/2008GL035755.
[11]	LEE C K, LEE G W, ZAWADZKI I, et al. A preliminaryanalysis of spatial variability of raindrop size distributionsduring stratiform rain events [J]. J. Appl. Meteor. Climatol.,2009, 48(2): 270-283.
[12]	NIU Sheng-jie, JIA Xing-can, SANG Jian-ren, et al.Distributions of raindrop sizes and fall velocities in a semiaridplateau climate: Convective versus stratiform rains [J]. J. Appl.Meteor. Climatol., 2010, 49(4): 632-645.
[13]	TAPIADOR F J, CHECA R, DE CASTRO M. Anexperiment to measure the spatial variability of rain drop sizedistribution using sixteen laser disdrometers [J]. Geophys. Res.Lett., 2010, 37, L16803, doi:10.1029/2010GL044120.
[14]	TOKAY A, BASHOR P G, HABIB E, et al. Raindrop sizedistribution measurements in Tropical Cyclones [J]. Mon. Wea.Rev., 2008, 136(5): 1669-1685.
[15]	CHANG W Y, WANG T C C, LIN P L. Characteristics ofthe raindrop size distribution and drop shape relation intyphoon systems in the western Pacific from the 2D videodisdrometer and NCU C-band polarimetric radar [J]. J. Atmos.Ocean Technol., 2009, 26(10): 1973-1993.
[16]	BATTAGLIA A, RUSTEMEIER E, TOKAY A, et al.PARSIVEL snow observations: A critical assessment [J]. J.Atmos. Ocean Technol., 2010, 27(2): 333-344.
[17]	YUTER S E, KINGSMILL D E, NANCE L B, et al.Observations of precipitation size and fall speed characteristicswithin coexisting rain and wet snow [J]. J. Appl. Meteor., 2006,45(10): 1450-1464.
[18]	CHEN Bao-jun, HU Wen, PU Jiang-ping. Characteristicsof the raindrop size distribution for freezing precipitationobserved in southern China [J]. J. Geophys. Res., 2011, 116,D06201, doi:10.1029/2010JD015305.
[19]	L?FFLER-MANG M, BLAHAK U. Estimation of theequivalent radar reflectivity factor from measured snow sizespectra [J]. J. Appl. Meteor., 2001, 40(4): 843-849.
[20]	L?FFLER-MANG M, JOSS J. An optical disdrometer formeasuring size and velocity of hydrometeors [J]. J. Atmos.Oceanic Technol., 2000, 17(2): 130-139.
[21]	GUNN R, KINZER G D. The terminal velocity of fall forwater droplets in stagnant air [J]. J. Meteor., 1949, 6(4):243-248.
[22]	ULBRICH C W. Natural variations in the analytical formof the raindrop size distribution [J]. J. Clim. Appl. Meteor.,1983, 22(10): 1764-1775.
[23]	VIVEKANANDAN J, ZHANG G, BRANDES E.Polarimetric radar estimators based on a constrained gammadrop size distribution model [J]. J. Appl. Meteor., 2004, 43(2):217-230.
[24]	BRINGI V N, CHANDRASEKAR V, HUBBERT J, et al.Raindrop size distribution in different climatic regimes fromdisdrometer and dual-polarized radar analysis [J]. J. Atmos.Sci., 2003, 60(2): 354-365.
[25]	HOUZE R A Jr. Clouds in tropical cyclones [J]. Mon.Wea. Rev., 2010, 138(2): 293-344.
[26]	BRANDES E A, ZHANG G, VIVEKANANDAN J. Anevaluation of a drop distribution�Cbased rainfall estimator [J]. J.Appl. Meteor., 2003, 42(5): 652-660.
[27]	ZHANG G, VIVEKANANDAN J, BRANDES E A, et al.The shape�Cslope relation in observed gamma raindrop sizedistributions: Statistical error or useful information? [J]. J.Atmos. Oceanic Technol., 2003, 20(8): 1106-1119.
[28]	JORGENSEN D P, WILLIS P T. A Z-R relationship forhurricanes [J]. J. Appl. Meteor., 1982, 21(3): 356-366.

MICROPHYSICAL CHARACTERISTICS OF THE RAINDROP SIZE DISTRIBUTION IN TYPHOON MORAKOT (2009)

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