A European Aerosol Research Lidar Network to Establish an Aerosol Climatology: EARLINET

The European Aerosol Research Lidar Network, EARLINET, was established in 2000 as a research project with the goal of creating a quantitative, comprehensive, and statistically significant database for the horizontal, vertical, and temporal distribution of aerosols on a continental scale. Since then EARLINET has continued to provide the most extensive collection of ground-based data for the aerosol vertical distribution over Europe.


Atmospheric aerosols are considered one of the major uncertainties in climate forcing, and a detailed aerosol characterization is needed in order to understand their role in the atmospheric processes as well as human health and environment. The most significant source of uncertainty is the large variability in space and time. Due to their short lifetime and strong interactions, their global concentrations and properties are poorly known. For these reasons, information on the large-scale three-dimensional aerosol distribution in the atmosphere should be continuously monitored. It is undoubted that information on the vertical distribution is particularly important and that lidar remote sensing is the most appropriate tool for providing this information. Long-term multiwavelength backscatter and extinction coefficient profiles are available from EARLINET through an easily accessible database, covering the European continent.

The dataset is used to validate and improve models that predict the future state of the atmosphere and its dependence on different scenarios describing economic development, including those actions taken to preserve the quality of the environment.


EARLINET will continue to build a quantitative comprehensive statistical database of the horizontal, vertical, and temporal distribution of aerosols on a continental scale. The goal is to provide aerosol data with unbiased sampling, for important selected processes, and air-mass history, together with comprehensive analyses of these data. The objectives will be reached by operating a network distributed over most of Europe, using advanced quantitative laser remote sensing to directly measure the vertical distribution of aerosols, supported by a suite of more conventional observations.

EARLINET measurements must meet stringent stability and absolute accuracy standards to achieve the desired confidence in aerosol radiative forcing needs; thus, the network has developed a rigorous quality assurance program addressing both instrument performance and evaluation of the algorithms. These operational pillars have been developed to ensure instrument standardization and consistent lidar retrievals within the network in a standardized data exchange format and are described in the following sections. For the full harmonization of data analysis and data traceability, the EARLINET Single Calculus Chain (SCC), a tool for the automatic analysis of lidar measurements has been developed.

A major part of the measurements is performed according to a fixed schedule to provide an unbiased statistically significant data set. Additional measurements are performed to specifically address important processes that are localised either in space or time. Back-trajectories derived from operational weather prediction models are used to characterise the history of the observed air parcels, accounting explicitly for the vertical distribution.

EARLINET is a key component of the ACTRIS infrastructure, which represents a big step towards a better coordination of the atmospheric observations in Europe towards the establishment of the European component of an Integrated Atmospheric Global System as part of GEOSS, the Global Earth Observation System of Systems (GEOSS, 2005). EARLINET is also a contributing network to the GAW Programme.



EARLINET is currently supported by the ACTRIS-2 project, funded by the European Union – Research Infrastructure Action under the H2020 specific programme for “Integrating and opening existing national and regional research infrastructures of European interest” under Grant Agreement n°654109 (1 May 2015 - 1 May 2019).


At present, 28 stations distributed over Europe are part of the network.

Map of the EARLINET stations currently active.

High resolution maps can be downloaded from the download section.

New EARLINET stations

EARLINET is a voluntary association of research institutions which shares scientific expertise and data. As part of the EARLINET community, each member benefits from continuous exchange / transfer of expertise, direct access to technological developments, intense scientific and technical training, support in accessing funds and, generally, a well-established reputation of high quality research. Although no funds are provided directly, collaboration within common research projects is encouraged. EARLINET has been involved over the years in several network-wide projects (EARLINET, EARLINET-ASOS, ACTRIS, ACTRIS-2) and numerous multi-lateral projects, which supported us to improve both as a distributed research infrastructure, and as an expert scientific forum.

Among the EARLINET members, lidar stations are of specific importance, through their contribution to the collection of atmospheric data, advancement of aerosol research and lidar technology. Lidars used by EARLINET are not standardized instruments moreover they are continuously upgraded to improve the quantity and the quality of the measured parameters. To cope with this diversity, a complex quality assurance program was developed and implemented.

Because of the constant dealing with significant dynamics, EARLINET can only afford to embrace active members, i.e. those who contribute systematically to the scientific and technical objectives. If you want to become an EARLINET lidar station, you have to consider an average 2-years period to accommodate to the rules described below. Although the efforts made during the integration process are significant, you will acknowledge that the number of benefits is much higher.

In order to apply for joining the network, please, read carefully the Guidelines and send a letter of interest to the EARLINET General Assembly (EARLINET speaker Gelsomina Pappalardo) using the template.

Last update: 20/10/2016