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Featured researches published by Radovan Krejci.


NUCLEATION AND ATMOSPHERIC AEROSOLS: 19th International Conference | 2013

Atmospheric aerosol variability and properties in lowermost tropical free troposphere

Radovan Krejci; Thomas Hamburger; Johan Ström; Peter Tunved; Tina Schmeissner; Modris Matisans; Silvia Margarita Calderón; Pedro Hoffman

The long-term measurements of aerosol number and size distributions in tropical free troposphere (FT) were carried out from 2007 until 2009. The measurements took place at the high altitude Atmospheric Research Station Pico Espejo located on top of the Sierra Nevada mountain ridge at 4765 m a.s.l. nearby the city of Merida, Venezuela. Analysis of aerosol number concentration, size distribution and light absorbing aerosol focuses mainly on possible links to the atmospheric general circulation in the tropics and seasonality driven changes in biomass burning activity. Repeatable annual and diurnal cycles of the particle number concentration were observed.


NUCLEATION AND ATMOSPHERIC AEROSOLS: 19th International Conference | 2013

New particle formation events observed at a high altitude site Pico Espejo, Venezuela

Tuomo Nieminen; Jenni Kontkanen; Radovan Krejci; Johan Ström; Peter Tunved; Thomas Hamburger; Silvia Margarita Calderón; Pedro Hoffman

Formation and growth events of nucleation mode particles (10-25 nm in diameter) were analyzed from 27 month period of particle size distribution measurements at the high altitude site Pico Espejo in Venezuela. Particle formation was observed both in air masses connected to boundary layer air and in free tropospheric conditions. The frequency and magnitude of particle formation at this high altitude site was comparable to many observations at lower altitude sites.


Atmospheric Chemistry and Physics | 2017

The topography contribution to the influence of the atmospheric boundary layer at high altitude stations

Martine Collaud Coen; E. Andrews; Diego Aliaga; Marcos Andrade; Hristo Angelov; Nicolas Bukowiecki; Marina Ealo; Paulo Fialho; H. Flentje; A. Gannet Hallar; R. K. Hooda; Ivo Kalapov; Radovan Krejci; Neng-Huei Lin; Angela Marinoni; Jing Ming; Nhat Anh Nguyen; Marco Pandolfi; Véronique Pont; Ludwig Ries; Sergio Rodríguez; Gerhard Schauer; K. Sellegri; Sangeeta Sharma; Junying Sun; Peter Tunved; Patricio Velasquez; Dominique Ruffieux


Atmospheric Chemistry and Physics | 2018

Identification of topographic features influencing aerosol observations at high altitude stations

Martine Collaud Coen; E. Andrews; Diego Aliaga; Marcos Andrade; Hristo Angelov; Nicolas Bukowiecki; Marina Ealo; Paulo Fialho; H. Flentje; A. Gannet Hallar; R. K. Hooda; Ivo Kalapov; Radovan Krejci; Neng-Huei Lin; Angela Marinoni; Jing Ming; Nhat Anh Nguyen; Marco Pandolfi; Véronique Pont; Ludwig Ries; Sergio Rodríguez; Gerhard Schauer; K. Sellegri; Sangeeta Sharma; Junying Sun; Peter Tunved; Patricio Velasquez; Dominique Ruffieux


Supplement to: Freud, E et al. (2017): Pan-Arctic aerosol number size distributions: seasonality and transport patterns. Atmospheric Chemistry and Physics, 17(13), 8101-8128, https://doi.org/10.5194/acp-17-8101-2017 | 2017

Pan-Arctic hourly mean homogenised (dry diameter range 20 to 500 nm) observations of aerosol number size distributions from five arctic long-term observation sites

Eyal Freud; Radovan Krejci; Peter Tunved; W. Richard Leaitch; Quynh T. Nguyen; Andreas Massling; Henrik Skov; L. A. Barrie


Ciencia e Ingeniería | 2013

Cationes base en la lluvia de Los Andes Venezolanos en la Hechicera, Venezuela

Silvia Margarita Calderón; Nayret Calderón Malavé; Edinzo Jesús Iglesias Sánchez; Francis Larez; Oneida Ramírez; Julio Hernández; Daisy Sosa; José María Anderez; P. Hoffmann; Radovan Krejci


Archive | 2012

Arctic Ocean water : A source of light absorbing particles to the atmosphere

Johan Ström; Julia Zábori; Radovan Krejci; Annica M. L. Ekman; Peter Tunved; M. Hansson


Archive | 2010

Aircraft Measurements of Aerosol Properties in Pollution Layers Transported into the Arctic in Spring and Summer Seasons

Andreas Minikin; Bernadett Weinzierl; Radovan Krejci; Ann-Christine Engvall; Hans Schlager; Frank Arnold; Johan Ström; Andreas Herber; Andreas Stohl


Archive | 2010

Aerosol microphysical properties during anticyclonic conditions over Europe during EUCAARI-LONGREX

Thomas Hamburger; Andreas Minikin; Andreas Petzold; Gavin McMeeking; Hugh Coe; Heikki Junninen; Adam Kristensson; Bas Henzing; M. Dall'Osto; Wolfram Birmili; H. Flentje; Radovan Krejci


Archive | 2010

Aircraft Measurements of Tropospheric Aerosol in Antarctica

Andreas Minikin; Radovan Krejci; Andreas Herber; Andreas Stohl

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Johan Ström

University of Birmingham

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Andreas Herber

Alfred Wegener Institute for Polar and Marine Research

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H. Flentje

Deutscher Wetterdienst

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