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Study of vertical structure of aerosol optical properties with sun photometers and ceilometer during the MACRON campaign in 2007

Markowicz K., Zieliński T., Blindheim S., Gausa M., Jagodnicka A., Kardas A., Kumala W., Malinowski S., Petelski T., Posyniak M.

Acta Geophysica

2012

Vol. 60, no. 5

1308-1337

This paper presents the measurements of a vertical structure of aerosol optical properties performed during the MACRON (Maritime Aerosol, Clouds and Radiation Observation in Norway) campaign, which took place in July and August 2007 at ALOMAR observatory on And?ya island (69.279 °N, 16.009 °E, elevation 380 m a.s.l.). The mean value of the aerosol optical thickness (AOT) at 500 nm during campaign was 0.12. Significant increase of the AOT above longtime mean value was observed on 7 and 8 August 2007 when the AOT exceeded 0.4 at 500 nm. Analyses of back trajectories show the aerosol transported from over Africa and Central Europe. The aerosol extinction coefficient obtained from the synergy of ceilometer and sun photometer observations reached 0.05-0.08 km-1 (at 1064 nm) in the dust layer. The single scattering albedo at the ALOMAR observatory decreased during the dust episode to 0.93-0.94, which indicates some absorptive aerosols in the lower PBL.

Node-node distance distribution for growing networks

Malarz K., Karpińska J., Kardas A., Kułakowski K.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2004

Vol. 8, No 1

115-119

We present a simulation of the time evolution of the distance matrix. The result is a node-node distance distribution for various kinds of networks. For the exponential trees, analytical formulas are derived for the moments of distance distribution.