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A New Lightning Parameterization and its Implementation in a Weather Prediction Model

Dahl, Johannes and Höller, Hartmut and Schumann, Ulrich (2010) A New Lightning Parameterization and its Implementation in a Weather Prediction Model. 25th AMS Conference on Severe Local Storms, 11.-14. Oktober 2010, Denver, CO, USA.

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Official URL: http://www.ametsoc.org/meet/fainst/201025sls.html

Abstract

Based on a straightforward physical model, a new lightning parameterization has been developed: A twoplate capacitor represents the basic dipole charge structure of a thunderstorm, which is charged by the generator current and discharged by lightning. In this approach, the generator current as well as the discharge strength are parameterized using the graupel-mass field. If these two quantities are known, and if the charging and discharging are in equilibrium, then the flash rate is uniquely determined. This approach remedies shortcomings of earlier theoretical approaches that relate the flash rate e.g., to generator power. No distinction is made between intracloud and cloud-to-ground discharges in this approach. In order to test this approach, polarimetric radar data were used, from which the graupel distribution in observed thunderstorms could be inferred. The lightning activity was detected using the LINET network. The comparison between theoretically-predicted and measured flash rates is encouraging: Over a wide range of flash rates, the new approach yields accurate results for isolated thunderstorms. The investigated cases include intense supercellular hailstorms, as well as weak and comparatively shallow storms at the weak end of the spectrum. This approach is compared with an existing approach which is based on the cold cloud depth of the thunderstorm. These approaches were implemented in the convection-resolving model, COSMO-DE. The output includes the time and the geographic location of each simulated discharge. Real-world scenarios were simulated and results will be shown for a severe hailstorm that affected southern Germany in August 2008.

Document Type:Conference or Workshop Item (Speech)
Title:A New Lightning Parameterization and its Implementation in a Weather Prediction Model
Authors:
AuthorsInstitution or Email of Authors
Dahl, JohannesDLR
Höller, HartmutDLR
Schumann, UlrichDLR
Date:2010
Status:Published
Keywords:Lightning, Thunderstorms, Modelling
Event Title:25th AMS Conference on Severe Local Storms
Event Location:Denver, CO, USA
Event Type:international Conference
Event Dates:11.-14. Oktober 2010
Organizer:American Meteorological Society, AMS
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Air Traffic and Weather (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Dr.rer.nat. Hartmut Höller
Deposited On:07 Jan 2011 14:28
Last Modified:07 Jan 2011 14:28

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