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Size distribution of atmospheric aerosols at Maitri, Antarctica

Pant, V and Siingh, D and Kamra, AK (2011) Size distribution of atmospheric aerosols at Maitri, Antarctica. Atmospheric Environment, 45 (29). pp. 5138-5149.

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Measurements of the concentration and size distribution of the atmospheric aerosol particles in the size range of 0.003–20 μm diameter have been made at Maitri (70°45′52″S, 11°44′03″E) during January–February, 2005. The measured particle size ranges extended from 0.5 to 20 μm throughout the period, from 0.016 to 0.7 μm in January and 0.01 to 0.4 μm in February. For short intervals of time, comprising a total period of 210 h, the measurements were made for particles in the size range of 0.003–0.16 μm. Total particle number concentrations of coarse and fine particles vary from 0.1 to 0.8 and from 100 to 2000 particles cm−3, respectively. The fine particle concentration undergoes a diurnal variation with values remaining low (300–400 cm−3) during low sun periods and increasing up to ∼750 cm−3 at noontime. The monthly-averaged number size distributions show maxima in accumulation mode at 0.772 ± 0.023 μm, in Aitken mode at 0.089 ± 0.005 μm in January which shifts to 0.03 ± 0.003 μm in February, and in nucleation mode at 0.018 ± 0.002 μm. The hourly-averaged curves can have one mode each in coarse, accumulation, and nucleation size ranges, and two modes in Aitken size range of particles. Total number concentration of particles in coarse mode is higher in oceanic than in continental air masses. Further, while the oceanic air masses have nucleation mode at 0.01 μm and Aitken mode at 0.024 μm, continental air masses have nucleation mode at 0.017 μm. Intermixing of the two air masses at coastal site results in multi-modal size distributions. It is inferred that while in continental air masses the nucleation mode particles are aged, in oceanic air masses these are likely to be transported from the upper troposphere under subsidence of cyclonic storms revolving around the continent of Antarctica

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Accumulation modes; Aerosol size distributions; Air mass; Aitken size; Antarctic aerosols; Antarctica; Atmospheric aerosol particles; Coarse mode; Coastal sites; Continental air mass; Cyclonic storms; Diurnal variation; Fine particles; Marine aerosols; Multi-modal; Nucleation mode particles; Nucleation modes; Number size distribution; Particle number concentration; Particle size ranges; Short-interval; Size ranges; Total number concentrations; Upper troposphere, Atmospheric thermodynamics; Nucleation; Particle size; Size distribution, Atmospheric aerosols, aerosol property; air mass; Aitken nucleus; concentration (composition); cyclone; diameter; marine atmosphere; mixing; nucleation; particle size; size distribution; storm; temporal variation; troposphere, aerosol; air; air pollution; Antarctica; article; atmosphere; atmospheric deposition; atmospheric pressure; atmospheric transport; concentration (parameters); measurement; molecular weight; particle size; particulate matter; priority journal; sea; sun; troposphere, Antarctica; East Antarctica; Maitri
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 12 Aug 2014 05:19
Last Modified: 12 Aug 2014 05:19

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