EARLINET climatology (2000-2010)

A European Aerosol Research Lidar Network to Establish an Aerosol ClimatologyAerosols affect life on earth in several ways. They play an important role in the climate system; the effect of aerosols on the global climate system is one of the major uncertainties of present climate predictions. They play a major role in atmospheric chemistry and hence affect the concentrations of other potentially harmful atmospheric constituents, e.g. ozone. They are an important controlling factor for the radiation budget, in particular in the UV-B part of the spectrum. At ground level, they can be harmful, even toxic, to man, animals, and plants. Because of these adverse effects that aerosols can have on human life, it is necessary to achieve an advanced understanding of the processes that generate, redistribute, and remove aerosols in the atmosphere.A quantitative dataset describing the aerosol vertical, horizontal, and temporal distribution, including its variability on a continental scale, is necessary. 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. The EARLINET data set is the most comprehensive compilation of data available for this purpose.This project description is taken from: http://www.earlinet.org/index.php?id=earlinet_homepageSummary: EARLINET climatological lidar observations are performed on a regularschedule of one daytime measurement per week around noon (on Monday), when theboundary layer is usually well developed, and two night-time measurements per week(on Monday and Thursday), with low background light, in order to perform Ramanextinction measurements. This regular schedule for observations minimizes the biasin the dataset possibly related to specific measurement conditions. The resultingdataset is used to obtain unbiased data for climatological studies.This dataset contains profiles of aerosol extinction, backscatter and lidar ratio.Several aerosol extinction/backscatter datasets can be present for the sameclimatological measurement in order to provide profiles either with a better temporalresolution or with an extended height range by using a larger temporal average.This is by far the largest dataset on the aerosol vertical distribution, and it isthe only one which is collected systematically and is covering a whole