Abstract

This work reports an analysis of the concentration, size distribution, and depositionvelocity of atmospheric particles over snow and iced surfaces on the Nansen Ice Sheet(Antarctica). Measurements were performed using the eddy-correlation method at a remotesite during the XXII Italian expedition of the National Research Program in Antarctica(PNRA) in 2006. The measurement system was based on a condensation particle counter(CPC) able to measure particles down to 9 nm in diameter with a 50% efficiency and aDifferential Mobility Particle Sizer for evaluating particle size distributions from 11 to521 nm diameter in 39 channels. A method based on postprocessing with digital filterswas developed to take into account the effect of the slow time response of the CPC. Theaverage number concentration was 1338 cm-3 (median, 978 cm-3; interquartile range,435-1854 cm-3). Higher concentrations were observed at low wind velocities. Resultsgave an average deposition velocity of 0.47 mm/s (median, 0.19 mm/s; interquartile range,-0.21 -0.88 mm/s). Deposition increased with the friction velocity and was on average0.86 mm/s during katabatic wind characterized by velocities higher than 4 m/s. Observedsize distributions generally presented two distinct modes, the first at approximately15-20 nm and the second (representing on average 70% of the total particles) at 60-70 nm.Under strong-wind conditions, the second mode dominated the average size distribution.

Autore Pugliese

• Donateo Antonio , Contini Daniele , Grasso Fabio Massimo

Tutti gli autori

• D. Contini; A. Donateo; F. Belosi; F.M. Grasso; G Santachiara; F. Prodi

Titolo volume/Rivista

Journal of geophysical research

Anno di pubblicazione

2010

ISSN

0148-0227

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

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Settori ERC

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Codici ASJC

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