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Titre du document / Document title

An upgraded estimate of the radiative forcing of cryoplane contrails

Auteur(s) / Author(s)

MARQUART Susanne (1) ; PONATER Michael (1) ; STRÖM Linda (1) ; GIERENS Klaus (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) DLR-Institut für Physik der Atmosphäre, Oberpfaffenhofen, ALLEMAGNE

Résumé / Abstract

The radiative forcing of contrails is quantified for a hypothetical fleet of cryoplanes in comparison with a conventional aircraft fleet. The differences in bulk optical properties between conventional and cryoplane contrails are determined by numerical simulations of the microphysical evolution of conventional and cryoplane contrails, under several ambient conditions. Both types of contrails contain about the same ice mass, but the mean effective particle radius is found to be smaller by about a factor of 0.3 in conventional contrails than in cryoplane ones. Hence, in case of cryoplanes the contrail optical depth is lower, which counteracts (with respect to radiative forcing) the effect of increased contrail cover due to the higher specific emission of water vapour. If the information gained from the microphysical simulations is translated to the framework of a global climate model, the global mean radiative forcing of cryoplane contrails is simulated to be between about 30% lower and 30% higher compared to the radiative forcing of conventional contrails, depending on the quantitative assumptions made for the mean particle properties and also depending on the time slice considered. Our results indicate that the effect of decreased optical depth is about the same magnitude as the effect of increased contrail cover. Current state of knowledge does not allow a conclusive assessment whether the net radiative impact of cryoplane contrails will be smaller or larger than that of conventional contrails. Uncertainty with respect to radiative forcing arises mainly from insufficient knowledge regarding the mean effective ice crystal radius for both conventional and, especially, cryoplane contrails.

Revue / Journal Title

Meteorologische Zeitschrift    ISSN  0941-2948 

Source / Source

Congrès
European Conference on Aviation, Atmosphere and Climate (AAC), Friedrichshafen , ALLEMAGNE (30/06/2003)
2005, vol. 14, no 4 (148 p.)  [Document : 10 p.] (1 p.1/4), pp. 573-582 [10 page(s) (article)]

Langue / Language

Anglais

Revue : Allemand

Editeur / Publisher

Gebrüder Borntraeger, Stuttgart, ALLEMAGNE  (1992) (Revue)

Mots-clés anglais / English Keywords

Numerical simulation

;

Comparative study

;

Optical thickness

;

Forcing

;

Radiative transfer

;

Effect on climate

;

Condensation trail

;

Liquid fuel

;

Liquid hydrogen

;

Airplane

;

Air traffic

;

Air transportation

;

Mots-clés français / French Keywords

Avion conventionnel

;

Simulation numérique

;

Etude comparative

;

Epaisseur optique

;

Forçage

;

Transfert radiatif

;

Effet sur climat

;

Traînée condensation

;

Combustible liquide

;

Hydrogène liquide

;

Avion

;

Trafic aérien

;

Transport aérien

;

Mots-clés espagnols / Spanish Keywords

Simulación numérica

;

Estudio comparativo

;

Espesor óptico

;

Forzamiento

;

Transferencia radiativa

;

Efecto sobre clima

;

Estela condensación

;

Combustible líquido

;

Hidrógeno líquido

;

Avión

;

Tráfico aéreo

;

Transporte aéreo

;

Localisation / Location

INIST-CNRS, Cote INIST : 4834, 35400013177432.0140

Nº notice refdoc (ud4) : 17164234



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