Adam Leelossy

Eötvös Loránd University · Department of Meteorology

Modeling of dispersion of air pollutants in the atmosphere is one of the most important and challenging scientific problems. There are several natural and anthropogenic events where passive or chemically active compounds are emitted into the atmosphere. The effect of these chemical species can have serious impacts on our environment and human healt...

We investigate the influence of the regional-scale weather types on the atmospheric dispersion processes of the air pollutants originated from point sources. Hypothetical accidents were simulated with two different dispersion models. During a year’s test period, the 6-h emission of a radionuclide from the Paks Nuclear Power Plant (Paks NPP, Hungary...

The Chernobyl accident and unfortunately the recent accident at the Fukushima 1 Nuclear Power Plant are the most serious accidents in the history of the nuclear technology and industry. Both of them have a huge and prolonged impact on environment as well as human health. Therefore, any technological developments and strategies that could diminish t...

Early peaks of airborne ragweed (Ambrosia L.) pollen concentrations were observed at several monitoring stations in Hungary in June 2017 and 2018, one month before the usual start of the pollen season at the end of July. Backward trajectories were calculated to simulate potential sources of pollen collected at different locations in the Pannonian B...

Similarly to other countries, the first wave of the COVID pandemic induced a collapse of mobility in Hungary during the spring of 2020. From the environmental perspective, the obtained road traffic reduction of 20–50% could be regarded as an undesired traffic regulation experiment. Air quality impacts within Hungary were evaluated based on data fro...

Siliceous marine microfossils were unexpectedly discovered during the analysis of flower honey samples from Poland and Tunisia. The microfossils were represented by protist with siliceous skeletons: silicoflagellates, diatoms, and endoskeletal dinoflagellates. This is the first record of such microfossils in honeys. Based on the high percent of ane...

Tritium has been long recognized as a useful tracer for the study of atmospheric transport, ocean circulation, and the global water cycle. In addition, the application of tritium measurements in various fields has grown significantly in the last few decades. Since 1963, the atmospheric test-ban treaty, bomb tritium concentrations in precipitation h...

Budapest, the capital of Hungary, has been facing serious air pollution episodes in the heating season similar to other metropolises. In the city a dense urban air quality monitoring network is available; however, air quality prediction is still challenging. For this purpose, 24-h PM2.5 forecasts obtained from seven individual models of the Coperni...

Ragweed Pollen Alarm System (R-PAS) has been running since 2014 to provide pollen information for countries in the Pannonian biogeographical region (PBR). The aim of this study was to develop forecast models of the representative aerobiological monitoring stations, identified by analysis based on a neural network computation. Monitoring stations wi...

In this study, we focus on the relationship between the water vapor source region and the isotopic composition of the precipitation. The change of isotope characteristics of precipitation depends on the moisture source region. Long-term stable isotope (δ 18 O, δ 2 H) measurements of precipitation were performed in Debrecen, Hungary, between 2001 an...

The emission parameterization is a crucial part of numerical pollen dispersion models. This paper shows that Artificial Neural Networks (ANNs) can substantially improve the performance of the Ambrosia pollen emission in numerical pollen dispersion models such as COSMO-ART. Based on simultaneous measurement of Ambrosia pollen concentrations and mete...

WRF-Chem is a numerical Eulerian non-hydrostatic mesoscale weather prediction model online coupled with the atmospheric chemistry model, developed mainly by the National Center for Atmospheric Research (NCAR) and the National Oceanic and Atmospheric Administration (NOAA). This model system is a frequently used tool for creating high resolution air...

A Parlagfű Pollen Riasztási Rendszer (Ragweed Pollen Alarm System (R-PAS)) 2014 óta nyújt információt a Pannon Biogeográfiai Régióban (PBR) lévő országok légterének pollenkoncentrációjáról. Tanulmányunk célja, egy, az aerobiológiai hálózat mérésein alapuló előrejelzési modell kifejlesztése neurális háló segítségével. A modell elkészítéséhez a PBR-b...

Tactic motion in nature is one of the key properties of a living organism. Similar behaviour can be observed in inanimate systems at the liquid-air interface, in which a chemical entity (droplets, particles) can be self-propped and provides artificial chemotactic motion in a gradient of concentration or temperature. In these systems the global and...

The field of atmospheric dispersion modeling has evolved together with nuclear risk assessment and emergency response systems. Atmospheric concentration and deposition of radionuclides originating from an unintended release provide the basis of dose estimations and countermeasure strategies. To predict the atmospheric dispersion and deposition of r...

In April 2015, a serious industrial pollution gained large public interest in Budapest, the capital city of Hungary. An abandoned industrial site of the former Budapest Chemical Works company was found to contain 2000-3000 tonnes of leaking industrial waste and dangerous chemicals. As the former factory is located in a densely populated urban envir...

Nowadays, several dispersion models are available to simulate the transport processes of air pollutants and toxic substances including radionuclides in the atmosphere. Reliability of atmospheric transport models has been demonstrated in several recent cases from local to global scale; however, very few actual emission data are available to evaluate...

Unconventional computational methods provide alternative ways to solve numerous mathematical and computational problems compared to conventional approaches. Maze solving and finding the shortest path is one of the most challenging problems in this field. In the past few decades, several chemical, physical, and other techniques have been developed....

Long-range simulation of the dispersion of air pollutants in the atmosphere is one of the most challenging tasks in geosciences. Application of precise and fast numerical models in risk management and decision support can save human lives and can diminish consequences of an accidental release. Disaster at Fukushima Daiichi nuclear power plant has b...

Simulation of the dispersion, chemical and physical transformations of air pollutants in the atmosphere is one of the most important and challenging tasks in environment science. Computations should be fast and the results should be precise to be used in decision support. There are two main approaches to solve atmospheric transport equations that d...

Several dispersion models are available to simulate the transport processes of air pollutants and toxic substances including radionuclides in the atmosphere. Reliability of atmospheric transport models has been demonstrated in several recent cases from local to global scale, however, very few actual emission data are available to evaluate model res...

Industrial accidents have been a serious environmental and public health issue for the last decades. Although the development of atmospheric dispersion models was largely motivated by the notorious nuclear catastrophes, simulations are now mostly used in cases of chemical accidents that regularly occur in all parts of the world. In an accidental si...

Computational Fluid Dynamics software are becoming more and more popular in environmental modelling, especially for the local scale simulations of the atmospheric dispersion of dangerous materials. However, successful application of a multi-purpose CFD application for atmospheric studies depends largely on the correct model setup. Selection of the...

An increased attention of anthropogenic effects on the environment was observable in the last decades. As more nuclear, biological and industrial accidents occurred in the different part of the world, there is an increased demand both on the part of population and scientific society for the understanding and effective prediction of the environmenta...