Charge structure and lightning sensitivity in a simulated multicell thunderstorm

[1] A three-dimensional dynamic cloud model is used to investigate electrification of the full life cycle of an idealized continental multicell storm. Five laboratory-based parameterizations of noninductive graupel-ice charge separation are compared. Inductive (i.e., electric field-dependent) charge separation is tested for rebounding graupel-droplet collisions. Each noninductive graupel-ice parameterization is combined with variations in the effectiveness of inductive charging (off, moderate, and strong) and in the minimum ice crystal concentration (10 or 50 L−1). Small atmospheric ion processes such as hydrometeor attachment and point discharge at the ground are treated explicitly. Three of the noninductive schemes readily produced a normal polarity charge structure, consisting of a main negative charge region with an upper main positive charge region and a lower positive charge region. Negative polarity cloud-to-ground (CG) flashes occurred when the lower positive charge (LPC) region had sufficient charge density to cause high electric fields. Two of the three also produced one or more +CG flashes. The other two noninductive charging schemes, which are dependent on the graupel rime accretion rate, tended to produce an initially inverted polarity charge structure and +CG flashes. The model results suggest that inductive graupel-droplet charge separation could play a role in the development of lower charge regions. Noninductive charging, on the other hand, was also found to be capable of producing strong lower charge regions in the tests with a minimum ice crystal concentration of 50 L−1.

[1]  Extension and Application of a Local, Minimum Aliasing Method to Multidimensional Problems in Limited-Area Domains , 1993 .

[2]  D. A. Johnson,et al.  Charge separation due to riming in an electric field , 1972 .

[3]  Joseph B. Klemp,et al.  The Dependence of Numerically Simulated Convective Storms on Vertical Wind Shear and Buoyancy , 1982 .

[4]  T. Kato A box-Lagrangian rain-drop scheme , 1995 .

[5]  W. Cotton,et al.  New primary ice-nucleation parameterizations in an explicit cloud model , 1992 .

[6]  W. D. Keith,et al.  The collection efficiency of a cylindrical target for ice crystals , 1989 .

[7]  F. J. Scrase,et al.  The Distribution of Electricity in Thunderclouds , 1937 .

[8]  Eldo E. Ávila,et al.  Charge sign reversal in irregular ice particle‐graupel collisions , 2005 .

[9]  W. Gaskell A laboratory study of the inductive theory of thunderstorm electrification , 2007 .

[10]  W. D. Keith,et al.  The effect of liquid water on thunderstorm charging , 1991 .

[11]  J. A. Chalmers,et al.  On Wilson's theory of the collection of charge by falling drops , 1944 .

[12]  E. Mansell,et al.  A Bulk Microphysics Parameterization with Multiple Ice Precipitation Categories , 2005 .

[13]  Evaluation and Interpretation of the Columnar Resistance of the Atmosphere , 1944 .

[14]  James E. Dye,et al.  A model evaluation of noninductive graupel‐ice charging in the early electrification of a mountain thunderstorm , 1991 .

[15]  J. Helsdon Chaff Seeding Effects in a Dynamical-Electrical Cloud Model , 1980 .

[16]  Tsutomu Takahashi,et al.  NOTES AND CORRESPONDENCE Reexamination of Riming Electrification in a Wind Tunnel , 2002 .

[17]  Jerry M. Straka,et al.  Numerical Simulations of Microburst-producing Storms: Some Results from Storms Observed during COHMEX , 1993 .

[18]  Tsutomu Takahashi Warm Cloud Electricity in a Shallow Axisyminetric Cloud Model , 1979 .

[19]  J. Chalmers,et al.  Point-discharge currents through small trees in artificial fields , 1967 .

[20]  Tsutomu Takahashi,et al.  Thunderstorm Electrification—A Numerical Study , 1984 .

[21]  Kelvin K. Droegemeier,et al.  Entrainment and Detrainment in Numerically Simulated Cumulus Congestus Clouds. Part I: General Results , 1998 .

[22]  Tomoo Ushio,et al.  Vertical Development of Lightning Activity Observed by the LDAR System: Lightning Bubbles. , 2003 .

[23]  C. Saunders,et al.  A laboratory study of charge transfer accompanying the collision of ice crystals with a simulated hailstone , 1978 .

[24]  Paul Krehbiel,et al.  A GPS‐based three‐dimensional lightning mapping system: Initial observations in central New Mexico , 1999 .

[25]  W. D. Rust,et al.  Possibly inverted‐polarity electrical structures in thunderstorms during STEPS , 2002 .

[26]  C. Saunders,et al.  An experimental investigation of the inductive mechanism of thunderstorm electrification , 1994 .

[27]  Chin-Shan Chiu,et al.  Numerical study of cloud electrification in an axisymmetric, time-dependent cloud model , 1978 .

[28]  C. Saunders,et al.  A laboratory study of graupel charging , 2000 .

[29]  M. Baker,et al.  Lightning flash rate and type in convective storms , 1998 .

[30]  E. R. Jayaratne The Heat Balance of a Riming Graupel Pellet and the Charge Separation during Ice–Ice Collisions , 1993 .

[31]  C. Saunders,et al.  Thunderstorm charging : laboratory experiments clarified , 1995 .

[32]  Robert B. Wilhelmson,et al.  Simulations of Right- and Left-Moving Storms Produced Through Storm Splitting , 1978 .

[33]  Tsutomu Takahashi,et al.  Riming Electrification as a Charge Generation Mechanism in Thunderstorms , 1978 .

[34]  B. P. Leonard,et al.  The ULTIMATE conservative difference scheme applied to unsteady one-dimensional advection , 1991 .

[35]  V. Chandrasekar,et al.  The Severe Thunderstorm Electrification and Precipitation Study , 2001 .

[36]  Ronald B. Standler,et al.  Effects of coronae on electric fields beneath thunderstorms , 1979 .

[37]  E. Mansell,et al.  Simulated three‐dimensional branched lightning in a numerical thunderstorm model , 2002 .

[38]  Brad Baker,et al.  The Influence of Diffusional Growth Rates On the Charge Transfer Accompanying Rebounding Collisions Between Ice Crystals and Soft Hailstones , 2007 .

[39]  C. Moeng A Large-Eddy-Simulation Model for the Study of Planetary Boundary-Layer Turbulence , 1984 .

[40]  B. J. Mason,et al.  Electrical charging of hail pellets in a polarizing electric held , 1962, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[41]  C. Saunders,et al.  Laboratory studies of the influence of the rime accretion rate on charge transfer during crystal/graupel collisions , 1998 .

[42]  J. Deardorff Stratocumulus-capped mixed layers derived from a three-dimensional model , 1980 .

[43]  Conrad L. Ziegler,et al.  Retrieval of Thermal and Microphysical Variables in Observed Convective Storms. , 1985 .

[44]  Roger Lhermitte,et al.  Doppler Radar and Radio Observations of Thunderstorms , 1979, IEEE Transactions on Geoscience Electronics.

[45]  G. Foote,et al.  Case Study of a Hailstorm in Colorado. Part III: Airflow From Triple-Doppler Measurements. , 1983 .

[46]  S. Jennings Electrical charging of water drops in polarizing electric fields , 1975 .

[47]  E. R. Jayaratne,et al.  Thunderstorm electrification: The effect of cloud droplets , 1985 .

[48]  R. Lhermitte,et al.  Thunderstorm electrification: A case study , 1985 .

[49]  Conrad L. Ziegler,et al.  Observed lightning morphology relative to modeled space charge and electric field distributions in a tornadic storm , 1994 .

[50]  John H. Helsdon,et al.  A numerical modeling study of a Montana thunderstorm: 2. Model results versus observations involving electrical aspects , 1987 .

[51]  R. Pereyra,et al.  Charge transfer during Crystal‐Graupel Collisions for two different cloud droplet size distributions , 2000 .

[52]  W. D. Rust,et al.  Electric field magnitudes and lightning initiation in thunderstorms , 1995 .

[53]  Peter V. Hobbs,et al.  Ice particle concentrations in clouds , 1985 .

[54]  E. Williams,et al.  Mixed-Phase Microphysics and Cloud Electrification. , 1991 .

[55]  Jerry M. Straka,et al.  A lightning parameterization for numerical cloud models , 2001 .

[56]  C. Saunders,et al.  The effects of high liquid water content on thunderstorm charging , 1992 .

[57]  John H. Helsdon,et al.  An examination of the convective charging hypothesis: Charge structure, electric fields, and Maxwell currents , 2002 .

[58]  E. Philip Krider,et al.  Electrostatic Field Changes Produced by Florida Lightning , 1976 .

[59]  S. Rutledge,et al.  A Modeling Study on the Early Electrical Development of Tropical Convection: Continental and Oceanic (Monsoon) Storms , 1994 .

[60]  E. Williams,et al.  A numerical study of thundercloud electrification by graupel‐crystal collisions , 1998 .

[61]  W. David Rust,et al.  Lightning and precipitation history of a microburst‐producing storm , 1988 .

[62]  James E. Dye,et al.  The Mechanism of Precipitation Formation in Northeastern Colorado Cumulus III. Coordinated Microphysical and Radar Observations and Summary , 1974 .

[63]  C. Scavuzzo,et al.  Thunderstorm Electrification Analysis: The Dependence on the Temperature-LWC Diagram. , 1996 .

[64]  F. Rawlins A numerical study of thunderstorm electrification using a three dimensional model incorporating the ice phase , 1982 .

[65]  John H. Helsdon,et al.  An examination of thunderstorm‐charging mechanisms using a two‐dimensional storm electrification model , 2001 .

[66]  R. Rauber,et al.  Numerical Simulation of the Effects of Varying Ice Crystal Nucleation Rates and Aggregation Processes on Orographic Snowfall , 1986 .

[67]  William L. Woodley,et al.  Deep convective clouds with sustained supercooled liquid water down to -37.5 °C , 2000, Nature.

[68]  E. L. Shreve Theoretical Derivation of Atmospheric Ion Concentrations, Conductivity, Space Charge Density, Electric Field and Generation Rate from 0 to 60 km , 1970 .

[69]  W. D. Keith,et al.  Further laboratory studies of the charging of graupel during ice crystal interactions , 1990 .

[70]  C. Saunders,et al.  Laboratory studies of the influence of cloud droplet size on charge transfer during crystal-graupel collisions , 1998 .

[71]  R. Pielke,et al.  The forward-in-time upstream advection scheme:extension to higher orders , 1987 .

[72]  E. R. Jayaratne,et al.  Laboratory studies of the charging of soft hail during ice crystal interactions , 1983 .

[73]  John Hallett,et al.  Measurements of initial potential gradient and particle charges in a Montana summer thunderstorm , 1985 .

[74]  M. Freeman,et al.  Dayside ionospheric convection changes in response to long‐period interplanetary Magnetic field oscillations: Determination of the ionospheric phase velocity , 1992 .

[75]  O. H. Gish Evaluation and Interpretation of the Columnar Resistance of the Atmosphere , 1943 .

[76]  M. Baker,et al.  Mechanism of charge transfer between colliding ice particles in thunderstorms , 1994 .

[77]  B. J. Mason,et al.  The generation of electric charges and fields in thuderstorms , 1988, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[78]  Joseph B. Klemp,et al.  The structure and classification of numerically simulated convective storms in directionally varying wind shears , 1984 .

[79]  John C. Adams,et al.  MUDPACK: Multigrid portable FORTRAN software for the efficient solution of linear elliptic partial d , 1989 .

[80]  D. J. Malan,et al.  Preliminary discharge processes in lightning flashes to ground , 1957 .

[81]  C. Saunders,et al.  The effect on thunderstorm charging of the rate of rime accretion by graupel , 1997 .

[82]  E. Williams,et al.  Density of rime in laboratory simulations of thunderstorm microphysics and electrification , 1996 .

[83]  Earle R. Williams,et al.  The tripole structure of thunderstorms , 1989 .

[84]  Richard E. Orville,et al.  The relationship between lightning type and convective state of thunderclouds , 1989 .

[85]  S. E. Reynolds,et al.  THUNDERSTORM CHARGE SEPARATION , 1957 .

[86]  U. Inan,et al.  Electrical discharge from a thundercloud top to the lower ionosphere , 2002, Nature.