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Titolo:
Validation of very high cloud droplet number concentrations in air masses transported thousands of kilometres over the ocean
Autore:
Martinsson, BG; Frank, G; Cederfelt, SI; Berg, OH; Mentes, B; Papaspiropoulos, G; Swietlicki, E; Zhou, JC; Flynn, M; Bower, KN; Choularton, TW; Makela, J; Virkkula, A; Van Dingenen, R;
Indirizzi:
Univ Lund, Div Nucl Phys, SE-22100 Lund, Sweden Univ Lund Lund Sweden SE-22100 und, Div Nucl Phys, SE-22100 Lund, Sweden UMIST, Dept Phys, Manchester M60 1QD, Lancs, England UMIST Manchester Lancs England M60 1QD Manchester M60 1QD, Lancs, England Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00014 ys, FIN-00014 Helsinki, Finland Commiss European Communities, Joint Res Ctr, Inst Environm, I-21020 Ispra,Italy Commiss European Communities Ispra Italy I-21020 nm, I-21020 Ispra,Italy
Titolo Testata:
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY
fascicolo: 2, volume: 52, anno: 2000,
pagine: 801 - 814
SICI:
0280-6509(200004)52:2<801:VOVHCD>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANTHROPOGENIC AEROSOLS; STRATIFORM CLOUDS; PARAMETERIZATION; MICROPHYSICS; PARTICLES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Martinsson, BG Univ Lund, Div Nucl Phys, POB 118, SE-22100 Lund, Sweden Univ Lund POB 118 Lund Sweden SE-22100 -22100 Lund, Sweden
Citazione:
B.G. Martinsson et al., "Validation of very high cloud droplet number concentrations in air masses transported thousands of kilometres over the ocean", TELLUS B, 52(2), 2000, pp. 801-814

Abstract

The microstructure of orographic clouds related to the aerosol present wasstudied during the second Aerosol Characterisation Experiment (ACE-2). Very high cloud droplet number concentrations (almost 3000 cm(-3)) were observed. These high concentrations occurred when clouds formed on a hill slope at Tenerife in polluted air masses originating in Europe that had transported the order of 1000 km over the Atlantic Ocean. The validity of the measured droplet number concentrations was investigated by comparing with measurements of the aerosol upstream of the cloud and cloud interstitial aerosol. Guided by distributions of the ratios between the measurements, three criteria of typically 30% in maximum deviation were applied to the measurements to test their validity. Agreement was found for 88% of the cases. The validated data set spans droplet number concentrations of 150 3000 cm(-3). The updraught velocity during the cloud formation was estimated to 2.2 m s(-1) bymodel calculations, which is typical of cumuliform clouds. The results of the present study are discussed in relation to cloud droplet number concentrations previously reported in the literature. The importance of promoting the mechanistic understanding of the aerosol/cloud interaction and the use of validation procedures of cloud microphysical parameters is stressed in relation to the assessment of the indirect climatic effect of aerosols.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 14:48:59