Center for Atmospheric Research

Atmospheric observatory at Otlica

Meteorological measurements

View from Otlica (45.93N, 13.91E, elevation 965m) towards S (Carst plateau, Bay of Trieste)

View from Dolenje near Ajdovščina (45.87N, 13.90E, 83 m.n.m.) towards Otlica

The UNG Atmospheric observatory at Otlica is a node in the national network for environmental monitoring operated by the Environmental Agency of the Republic of Slovenia (ARSO) and continuously provides a number of meteorological and environmental measurements, which are being used for research and teaching at UNG. In 2013, our meteorological station at Otlica has been upgraded and serves as a test case for the future monitoring network in Slovenia. It has new wind, precipitation, temperature and solar irradiation sensors and broadband connection, which provides increased sampling frequencies with periodicity of 10 minutes. The new station will in particular be used for Bora wind studies, a phenomenon that frequently gives rise to winds with speeds exceeding 120 km/h in the region.

Lidar research

Aerosol transport in the troposphere and other atmospheric properties are being studied using a Mie and a Raman lidar system, which measure various types of backscattering of short laser pulses on aerosols and molecules of air. Otlica Mie lidar provides information on optical properties of the troposphere above the Vipava valley, Karst plateu and the Bay of Trieste up to the distances of about 40 km from the lidar site, based on which the areas with increased aerosol concentrations can be identified. Further information regarding aerosol origin and microscopic properties can be obtained by the use of meteorological models for the backtracking of their transport trajectories.


Schematic view of the Otlica lidars line of sight.


An example scan using the Mie lidar showing a layer of clouds at about 8 km above the sea level.