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Microphysical and optical properties of midlatitude cirrus clouds observed in the southern hemisphere during INCA

Gayet, Jean-Francois and Shcherbakov, Valery and Mannstein, Hermann and Minikin, Andreas and Schumann, Ulrich and Ström, Johan and Petzold, Andreas and Ovarlez, Joelle and Immler, Franz (2006) Microphysical and optical properties of midlatitude cirrus clouds observed in the southern hemisphere during INCA. DOI: 10.1256/qj.05.162.

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Official URL: http://www3.interscience.wiley.com/cgi-bin/jissue/114123345

Abstract

Airborne microphysical and optical properties of cirrus clouds, jet-stream and wave clouds were measured at temperatures ranging from −25° C to −62° C in the southern hemisphere from Punta Arenas (53° S) in March and April 2000 during the INCA experiment (INterhemispheric differences in Cirrus properties from Anthropogenic emissions). The observations related to cirrus clouds show general decreases of the ice water content (18 mg m<sup>−3</sup> to 0.05 mg m<sup>−3</sup>), extinction coefficient (0.70 km<sup>−1</sup> to 0.08 km<sup>−1</sup>), ice particle concentration (2.2 cm<sup>−3</sup> to 0.5 cm<sup>−3</sup>), and the effective diameter (80 μm to 17 μm) linked to the variation of ambient temperature (−25° C to −60° C). The lowest temperature at which supercooled water droplets were detected was −33° C. The asymmetry parameter shows relatively small variations, with the smallest values (0.758) observed at the lowest temperatures. High-altitude clouds which form with a rapid vertical transport, i.e. jet-stream cirrus and orographic-wave ice-cloud, are characterized by very high values of ice particle concentrations (up to 100 cm<sup>−3</sup>) compared to mean values as a whole (1.45 cm<sup>−3</sup>). These two kinds of high clouds are the subjects of detailed case-studies. Although formed at a similar range of temperatures and with similar aerosol properties, the strong differences in cloud properties and humidity fields highlight the key role of the dynamical structure in controlling the formation, evolution and subsequent radiative properties of such high-altitude clouds.

Document Type:Article
Title:Microphysical and optical properties of midlatitude cirrus clouds observed in the southern hemisphere during INCA
Authors:
AuthorsInstitution or Email of Authors
Gayet, Jean-FrancoisUniv. Blaise Pascal, Aubière, F
Shcherbakov, ValeryInst. of Physics, Minsk, BRS
Mannstein, HermannUNSPECIFIED
Minikin, AndreasUNSPECIFIED
Schumann, UlrichUNSPECIFIED
Ström, JohanStockholm Univ., S
Petzold, AndreasUNSPECIFIED
Ovarlez, JoelleCNRS/IPSL, Palaiseau, F
Immler, FranzAWI, Bremerhaven
Date:2006
Refereed publication:No
Volume:132
DOI:10.1256/qj.05.162
Page Range:pp. 2719-2748
Status:Published
Keywords:Aircraft observations, Ice particles, Microphysics
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Atmospheric Remote Sensing
Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:25 Jun 2007
Last Modified:11 Nov 2014 21:56

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