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Titolo:
TEMPORAL AND SPATIAL VARIATIONS OF THE ATMOSPHERIC DUST LOADING THROUGHOUT WEST-AFRICA OVER THE LAST 30 YEARS
Autore:
NTCHAYI GM; BERTRAND J; LEGRAND M; BAUDET J;
Indirizzi:
UNIV LILLE 1,OPT ATMOSPHER LAB F-59655 VILLENEUVE DASCQ FRANCE UNIV LILLE 1,OPT ATMOSPHER LAB F-59655 VILLENEUVE DASCQ FRANCE FAST,PHYS ATMOSPHERE LAB ABIDJAN 22 COTE IVOIRE
Titolo Testata:
Annales geophysicae
fascicolo: 2-3, volume: 12, anno: 1994,
pagine: 265 - 273
SICI:
0992-7689(1994)12:2-3<265:TASVOT>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
SATELLITE DATA; DROUGHT; RAINFALL; TRANSPORT; SAHEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
G.M. Ntchayi et al., "TEMPORAL AND SPATIAL VARIATIONS OF THE ATMOSPHERIC DUST LOADING THROUGHOUT WEST-AFRICA OVER THE LAST 30 YEARS", Annales geophysicae, 12(2-3), 1994, pp. 265-273

Abstract

The dust haze conditions, typical of the African atmosphere south of the Sahara, are a result of wind-generated dust from arid lands. The magnitude of the dust haze is evaluated for the 30-year period beginning in 1957 by calculating the number of occurrences where the observed visibility was reduced below threshold values of 10 km and 5 km. The frequency of low visibility was several times greater for the 1977-1986period than for the 1957-1966 period. Large decreases in visibility are observed after the severe droughts of 1972-1973 and 1982-1984. Contrasting regional differences of the dustiness evolution are noticed. These differences are closely related to the differences in the regional rainfall evolution. The increase in dustiness is believed to arise from dust produced in new desertic areas which result from rainfall shortages along the southern border of the Sahara.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 19:03:53