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

Dahl, Johannes und Höller, Hartmut und 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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Offizielle URL: http://www.ametsoc.org/meet/fainst/201025sls.html

Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:A New Lightning Parameterization and its Implementation in a Weather Prediction Model
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Dahl, JohannesDLR
Höller, HartmutDLR
Schumann, UlrichDLR
Datum:2010
Status:veröffentlicht
Stichwörter:Lightning, Thunderstorms, Modelling
Veranstaltungstitel:25th AMS Conference on Severe Local Storms
Veranstaltungsort:Denver, CO, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:11.-14. Oktober 2010
Veranstalter :American Meteorological Society, AMS
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Luftverkehr und Wetter (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Wolkenphysik und Verkehrsmeteorologie
Hinterlegt von: Dr.rer.nat. Hartmut Höller
Hinterlegt am:07 Jan 2011 14:28
Letzte Änderung:07 Jan 2011 14:28

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