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Effective real refractive index of dry aerosols in the Antarctic boundary layer
Author(s) -
Virkkula A.,
Koponen I. K.,
Teinilä K.,
Hillamo R.,
Kerminen VM.,
Kulmala M.
Publication year - 2006
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 - 10.1029/2005gl024602
Subject(s) - aerosol , refractive index , mie scattering , boundary layer , atmospheric sciences , scattering , environmental science , materials science , mineralogy , chemistry , physics , meteorology , light scattering , optics , thermodynamics
The real refractive index ( n r ) of dry aerosols measured at an Antarctic site was calculated using two methods. Number size distributions were applied in a Mie model where n r was varied until the measured and modeled scattering coefficients matched. Ion concentrations analyzed from impactor samples were used for calculating size‐dependent n r . Generally the two methods were consistent with each other. The average iteration‐derived n r varied mainly between ∼1.4 and ∼1.5 but also unreasonably low values, n r < 1.3, were obtained in air masses from the ocean. Possible explanations, such as inaccuracies in the method, water in the particles, non‐analyzed biogenic particles, or non‐spherical particles being responsible for the low values are discussed.

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