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Titolo:
Contribution to the climatological study of lightning
Autore:
Michalon, N; Nassif, A; Saouri, T; Royer, JF; Pontikis, CA;
Indirizzi:
Univ Antilles & Guyane, Meteo France, UFR Sci, Lab Phys Atmosphere Trop,CNRM, Pointe a Pitre 97159, Guadeloupe Univ Antilles & Guyane Pointe a Pitre Guadeloupe 97159 97159, Guadeloupe
Titolo Testata:
GEOPHYSICAL RESEARCH LETTERS
fascicolo: 20, volume: 26, anno: 1999,
pagine: 3097 - 3100
SICI:
0094-8276(19991015)26:20<3097:CTTCSO>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
TROPICAL THUNDERSTORM CLOUDS; FRENCH-GUYANA COAST; ATMOSPHERE MODEL; DISTRIBUTIONS; FREQUENCIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Michalon, N Univ Antilles & Guyane, Meteo France, UFR Sci, Lab Phys Atmosphere Trop,CNRM, Pointe a Pitre 97159, Guadeloupe Univ Antilles & Guyane Pointe a Pitre Guadeloupe 97159 loupe
Citazione:
N. Michalon et al., "Contribution to the climatological study of lightning", GEOPHYS R L, 26(20), 1999, pp. 3097-3100

Abstract

In this work. a new parameterization of the thunderstorm cloud electrical flash frequency is obtained on the basis of simple dimensional arguments. The flash frequency is expressed as a power function of both the cloud top height and the cloud droplet concentration, thus partly taking into account the role of the microphysical cloud characteristics. Since droplet concentrations are not predicted by General Circulation Models (GCMs) and further show great variability, two different "standard" droplet concentrations, respectively valid for continental and maritime thunderstorms, are used. A numerical experiment has been made by using the METEO-France GCM "ARPEGE" in relation to both, this new parameterization and the Price and Rind (1992) parameterization, in order to determine the global characteristics of electrical flashes. The analysis of the results reveals that the mean annual global flash frequency as well as the total number of flashes that strike annually the globe are higher when the new parameterization is used but are in better agreement with the Optical Transient Detector (OTD) (Christian et at.,1996) observations, thus indirectly attesting for its validity. Further, the good agreement between monthly and diurnal global flash numbers and the corresponding OTD observations confirms the ability of "ARPEGE' of correctly representing the global thunderstorm development. Finally, the new parameterization has been used in a second numerical experiment in order to inferthe role of a doubling of CO2 on the global distribution of electrical flashes. A 10% increase of the mean global annual flash frequency is obtained for a surface warming of roughly 2 degrees C.

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Documento generato il 28/11/20 alle ore 18:44:35