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In situ measurements of the scattering phase function of stratocumulus, contrails and cirrus
Author(s) -
Gayet JeanFrançois,
Auriol Frédérique,
Oshchepkov Sergey,
Schröder Franz,
Duroure Christophe,
Febvre Guy,
Fournol JeanFrançois,
Crépel Olivier,
Personne Pascal,
Daugereon Daniel
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl00541
Subject(s) - cirrus , nephelometer , ice crystals , scattering , marine stratocumulus , remote sensing , environmental science , phase (matter) , radiative transfer , phase function , cloud physics , atmospheric sciences , mie scattering , liquid water content , range (aeronautics) , meteorology , light scattering , optics , cloud computing , physics , materials science , geology , aerosol , quantum mechanics , computer science , composite material , operating system
Original measurements were obtained in stratocumulus, contrails and cirrus clouds by using a new optical airborne probe, the ‘Polar Nephelometer’, which is the first airborne instrument to make direct in situ measurements of the scattering phase function of cloud particles over a broad range of sizes (from a few micrometers to about 500 µm diameter). Preliminary measurements show that in stratocumulus water droplet cloud, the measured phase function fits very well with the phase function derived from direct PMS probes measurements. This definitively confirms the reliability of the Polar Nephelometer for airborne measurements. In contrails and natural cirrus, measured scattering phase function indicates major differences with those used in cloud models which assume ice spheres or simple geometric shape of ice particles. These results highlight new potential insights on both modelling of climate processes and methodologies for cloud remote sensing from satellite measurements.