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Analysis of number size distributions of tropical free tropospheric aerosol particles observed at Pico Espejo (4765 m a.s.l.), Venezuela

Schmeissner T, Krejci R, Ström J, Birmili W, Wiedensohler A, Hochschild G, Gross J, Hoffmann P, Calderon S ...see all

Atmospheric Chemistry and Physics, vol. 11, issue 7 (2011) pp. 3319-3332

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Abstract

The first long-term measurements of aerosol num- ber and size distributions in South-American tropical free troposphere (FT) were performed from March 2007 until March 2009. The measurements took place at the high al- titude Atmospheric Research Station Alexander von Hum- boldt. The station is located on top of the Sierra Nevada mountain ridge at 4765ma.s.l. nearby the city of M´ erida, Venezuela. Aerosol size distribution and number concentra- tion data was obtained with a custom-built Differential Mo- bility Particle Sizer (DMPS) system and a Condensational Particle Counter (CPC). The analysis of the annual and diur- nal variability of the tropical FT aerosol focused mainly on possible links to the atmospheric general circulation in the tropics. Considerable annual and diurnal cycles of the parti- cle number concentration were observed. Highest total par- ticle number concentrations were measured during the dry season (January–March, 519±613cm−3), lowest during the wet season (July–September, 318±194cm−3). The more humid FT (relative humidity (RH) range 50–95%) contained generally higher aerosol particle number concentrations (573±768cm−3 during dry season, 320±195cm−3 during wet season) than the dry FT (RH

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Authors

  • T. Schmeissner

  • R. Krejci

  • J. Ström

  • W. Birmili

  • A. Wiedensohler

  • G. Hochschild

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