TY - JOUR AU - Király, Csilla AU - Falus, György AU - Gresina, Fruzsina AU - Jakab, Gergely Imre AU - Szalai, Zoltán AU - Varga, György TI - Granulometric properties of particles in Upper Miocene sandstones from thin sections, Szolnok Formation, Hungary JF - HUNGARIAN GEOGRAPHICAL BULLETIN (2009-) J2 - HUNG GEOGR BULL (2009-) VL - 68 PY - 2019 IS - 4 SP - 341 EP - 353 PG - 13 SN - 2064-5031 DO - 10.15201/hungeobull.68.4.2 UR - https://m2.mtmt.hu/api/publication/31029800 ID - 31029800 N1 - Geographical Institute, Research Centre for Astronomy and Earth Sciences, Budaörsi út 45, Budapest, H-1112, Hungary Mining and Geological Survey of Hungary, Columbus u. 17-23, Budapest, H-1145, Hungary Institute of Geography and Earth Sciences, Faculty of Science, Eötvös University, Pázmány Péter sétány 1/c, Budapest, H-1117, Hungary Institute of Geography and Geoinformatics, University of Miskolc, Egyetemváros, Miskolc, H-3515, Hungary Cited By :2 Export Date: 25 October 2020 Correspondence Address: Falus, G.; Mining and Geological Survey of Hungary, Columbus u. 17-23, Hungary Geographical Institute, Research Centre for Astronomy and Earth Sciences, Budaörsi út 45, Budapest, H-1112, Hungary Mining and Geological Survey of Hungary, Columbus u. 17-23, Budapest, H-1145, Hungary Institute of Geography and Earth Sciences, Faculty of Science, Eötvös University, Pázmány Péter sétány 1/c, Budapest, H-1117, Hungary Institute of Geography and Geoinformatics, University of Miskolc, Egyetemváros, Miskolc, H-3515, Hungary Cited By :2 Export Date: 11 February 2021 Correspondence Address: Falus, G.; Mining and Geological Survey of Hungary, Columbus u. 17-23, Hungary Funding text 1: Acknowledgement: Support of the National Research, Development and Innovation Office NKFIH K131353, K120620, FK-128230 is gratefully acknowledged. The research was additionally supported by KEP-08. LA - English DB - MTMT ER - TY - JOUR AU - Varga, György AU - Újvári, Gábor AU - Kovács, János TI - Interpretation of sedimentary (sub)populations extracted from grain size distributions of Central European loess-paleosol series JF - QUATERNARY INTERNATIONAL J2 - QUATERN INT VL - 502 PY - 2019 IS - Part A SP - 60 EP - 70 PG - 11 SN - 1040-6182 DO - 10.1016/j.quaint.2017.09.021 UR - https://m2.mtmt.hu/api/publication/3280132 ID - 3280132 AB - Grain size proxies of aeolian dust deposits have widely been applied in environmental and sedimentary studies. However, large body of research papers are not taking into consideration that a complex grain size distribution curve cannot be an indicator of a single one environmental factor (e.g. wind speed/strength, transportation distance, aridity). The aim of the present paper is to discuss the main differences of frequently used statistical methods and to provide possible interpretations of the results by applying these various approaches on the high-resolution loess-paleosol profile of Dunaszekcso, South Hungary (Central Europe). Beside single statistical descriptors (mean, median, mode) of grain size and simple indices of size-fraction ratios (U-ratio, Grain Size Index), some more complex algorithms were also used in our paper. The applied parametric curve-fitting, end-member modelling and hierarchical cluster analysis techniques are using the whole spectrum of the measured grain size distributions and provide a more reliable and more representative results even in case of small scale variations. According to our findings, approaches which provide direct linkage among simple statistical descriptors and single atmospheric or other environmental elements are rather oversimplified as properties aeolian dust deposits are influenced by the integrated effects of several concurrent processes. Differences of more complex decomposition methods arise from the different approach and scope. End-members are determined from the unmixing based on the covariance structure of the whole grain size data-series of the section, while the parametric curve-fitting is based on the one-by-one deconvolution of the grain size distribution curves. End-members of loess-paleosol samples are regarded as representation of the average dust grain size distribution of various temporal sediment clusters of seasonal or other short-term intervals, while (sub) populations by parametric curve-fitting are proposed to illustrate process-related elements of background and dust storm depositional components for each sample. Results of cluster analysis represent similar grouping conditions as end-member modelling with a reduced sedimentary and genetically meaning. (C) 2017 Elsevier Ltd and INQUA. All rights reserved. LA - English DB - MTMT ER - TY - JOUR AU - Varga, György AU - Gresina, Fruzsina AU - Újvári, Gábor AU - Kovács, János AU - Szalai, Zoltán TI - On the reliability and comparability of laser diffraction grain size measurements of paleosols in loess records JF - SEDIMENTARY GEOLOGY J2 - SEDIMENT GEOL VL - 389 PY - 2019 SP - 42 EP - 53 PG - 12 SN - 0037-0738 DO - 10.1016/j.sedgeo.2019.05.011 UR - https://m2.mtmt.hu/api/publication/30710244 ID - 30710244 N1 - Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Budapest, H-1112, Hungary Institute of Geography and Earth Sciences, Faculty of Science, Eötvös University, Pázmány Péter sétány 1/c, Budapest, H-1117, Hungary Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi u. 45, Budapest, H-1112, Hungary Department of Lithospheric Research, University of Vienna, Althanstraße 14, Wien, A-1090, Austria Environmental Analytical & Geoanalytical Research Group, Szentágothai Research Centre, University of Pécs, Ifjúság u. 20, Pécs, H-7624, Hungary Department of Geology & Meteorology, University of Pécs, Ifjúság u. 6, Pécs, H-7624, Hungary Export Date: 16 July 2019 Correspondence Address: Varga, G.; Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Hungary; email: varga.gyorgy@csfk.mta.hu Funding Agency and Grant Number: National Research, Development and Innovation Office [NKFIH K120620, KH130337]; MTA research fund [KEP-08/2018] Funding text: Support of the National Research, Development and Innovation Office NKFIH K120620 and KH130337 are gratefully acknowledged. The research was additionally supported by the MTA research fund KEP-08/2018. Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Budapest, H-1112, Hungary Institute of Geography and Earth Sciences, Faculty of Science, Eötvös University, Pázmány Péter sétány 1/c, Budapest, H-1117, Hungary Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi u. 45, Budapest, H-1112, Hungary Department of Lithospheric Research, University of Vienna, Althanstraße 14, Wien, A-1090, Austria Environmental Analytical & Geoanalytical Research Group, Szentágothai Research Centre, University of Pécs, Ifjúság u. 20, Pécs, H-7624, Hungary Department of Geology & Meteorology, University of Pécs, Ifjúság u. 6, Pécs, H-7624, Hungary Export Date: 24 September 2019 Correspondence Address: Varga, G.; Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Hungary; email: varga.gyorgy@csfk.mta.hu LA - English DB - MTMT ER - TY - JOUR AU - Varga, György AU - Kovács, János AU - Szalai, Zoltán AU - Cserháti, Csaba AU - Újvári, Gábor TI - Granulometric characterization of paleosols in loess series by automated static image analysis JF - SEDIMENTARY GEOLOGY J2 - SEDIMENT GEOL VL - 370 PY - 2018 SP - 1 EP - 14 PG - 11 SN - 0037-0738 DO - 10.1016/j.sedgeo.2018.04.001 UR - https://m2.mtmt.hu/api/publication/3357510 ID - 3357510 N1 - Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, H-1112, Budapest, Hungary Department of Geology & Meteorology, University of Pécs, Ifjúság u. 6, Pécs, H-7624, Hungary Environmental Analytical & Geoanalytical Research Group, Szentágothai Research Centre, University of Pécs, Ifjúság u. 20, Pécs, H-7624, Hungary Department of Environmental and Landscape Geography (Institute of Geography and Earth Sciences, Faculty of Science), Eötvös University, Pázmány Péter sétány 1/c, Budapest, H-1117, Hungary Department of Solid State Physics, University of Debrecen, Bem tér 18/b, Debrecen, H-4026, Hungary Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi u. 45., Budapest, H-1112, Hungary Cited By :11 Export Date: 25 October 2020 Correspondence Address: Varga, G.; Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, H-1112, Hungary; email: varga.gyorgy@csfk.mta.hu LA - English DB - MTMT ER - TY - JOUR AU - Varga, György AU - Roettig, C-B TI - Identification of Saharan dust particles in Pleistocene dune sand- paleosol sequences of Fuerteventura (Canary Islands) JF - HUNGARIAN GEOGRAPHICAL BULLETIN (2009-) J2 - HUNG GEOGR BULL (2009-) VL - 67 PY - 2018 IS - 2 SP - 121 EP - 141 PG - 21 SN - 2064-5031 DO - 10.15201/hungeobull.67.2.2 UR - https://m2.mtmt.hu/api/publication/3394402 ID - 3394402 N1 - Export Date: 30 August 2019 Correspondence Address: Varga, G.; Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Hungary; email: varga.gyorgy@csfk.mta.hu Export Date: 24 September 2019 Correspondence Address: Varga, G.; Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Hungary; email: varga.gyorgy@csfk.mta.hu Cited By :8 Export Date: 25 October 2020 Correspondence Address: Varga, G.; Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Hungary; email: varga.gyorgy@csfk.mta.hu Cited By :8 Export Date: 26 October 2020 Correspondence Address: Varga, G.; Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45, Hungary; email: varga.gyorgy@csfk.mta.hu LA - English DB - MTMT ER - TY - JOUR AU - Udvardi, Beatrix AU - Kovács, István János AU - Fancsik, Tamás AU - Kónya, Péter AU - Batori, M AU - Stercel, F AU - Falus, György AU - Szalai, Zoltán TI - Effects of particle size on the attenuated total reflection spectrum of minerals JF - APPLIED SPECTROSCOPY J2 - APPL SPECTROSC VL - 71 PY - 2017 IS - 6 SP - 1157 EP - 1168 PG - 12 SN - 0003-7028 DO - 10.1177/0003702816670914 UR - https://m2.mtmt.hu/api/publication/3238351 ID - 3238351 N1 - Geological and Geophysical Institute of Hungary, Budapest, Hungary Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budapest, Hungary Department of Environmental and Landscape Geography, Eötvös University, Budapest, Hungary Cited By :11 Export Date: 3 September 2019 CODEN: APSPA Correspondence Address: Udvardi, B.; Geological and Geophysical Institute of Hungary, Stefánia u. 14, Hungary; email: udvardi.beatrix@mfgi.hu AB - This study focuses on particle size effect on monomineralic powders recorded using attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy. Six particle size fractions of quartz, feldspar, calcite, and dolomite were prepared (<2, 2-4, 4-8, 8-16, 16-32, and 32-63 mu m). It is found that the width, intensity, and area of bands in the ATR FT-IR spectra of minerals have explicit dependence on the particle size. As particle size increases, the intensity and area of IR bands usually decrease while the width of bands increases. The band positions usually shifted to higher wavenumbers with decreasing particle size. Infrared spectra of minerals are the most intensive in the particle size fraction of 2-4 mu m. However, if the particle size is very small (<2 mu m), due to the wavelength and penetration depth of the IR light, intensity decreases. Therefore, the quantity of very fine-grained minerals may be underestimated compared to the coarser phases. A nonlinear regression analysis of the data indicated that the average coefficients and indices of the power trend line equation imply a very simplistic relationship between median particle diameter and absorbance at a given wavenumber. It is concluded that when powder samples with substantially different particle size are compared, as in regression analysis for modal predictions using ATR FT-IR, it is also important to report the grain size distribution or surface area of samples. The band area of water (3000-3620cm(-1)) is similar in each mineral fraction, except for the particles below 2 mu m. It indicates that the finest particles could have disproportionately more water adsorbed on their larger surface area. Thus, these higher wavenumbers of the ATR FT-IR spectra may be more sensitive to this spectral interference if the number of particles below 2 mu m is considerable. It is also concluded that at least a proportion of the moisture could be very adhesive to the particles due to the band shift towards lower wavenumbers in the IR range of 3000-3620cm(-1). LA - English DB - MTMT ER - TY - JOUR AU - Újvári, Gábor AU - Kok, J F AU - Varga, György AU - Kovács, János TI - The physics of wind-blown loess: Implications for grain size proxy interpretations in Quaternary paleoclimate studies JF - EARTH-SCIENCE REVIEWS J2 - EARTH-SCI REV VL - 154 PY - 2016 SP - 247 EP - 278 PG - 32 SN - 0012-8252 DO - 10.1016/j.earscirev.2016.01.006 UR - https://m2.mtmt.hu/api/publication/3011427 ID - 3011427 N1 - Funding Agency and Grant Number: Hungarian Scientific Research FundOrszagos Tudomanyos Kutatasi Alapprogramok (OTKA) [OTKA PD-108639]; Bolyai Janos Research Scholarship of the Hungarian Academy of SciencesHungarian Academy of Sciences [BO/00326/15/10]; Directorate For GeosciencesNational Science Foundation (NSF)NSF - Directorate for Geosciences (GEO) [1358621] Funding Source: National Science Foundation; Div Atmospheric & Geospace SciencesNational Science Foundation (NSF)NSF - Directorate for Geosciences (GEO) [1358621] Funding Source: National Science Foundation Funding text: This work has been funded by a post doc project from the Hungarian Scientific Research Fund to GU (OTKA PD-108639). Additional financial support provided by the Bolyai Janos Research Scholarship of the Hungarian Academy of Sciences (BO/00326/15/10) (GU, GV) is gratefully acknowledged. Constructive and insightful comments by Joe Mason and Thomas Stevens improved this paper substantially. Editorial handling and comments by Ian Candy is appreciated. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi u. 45., Budapest, H-1112, Hungary Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Acaemy of Sciences, Csatkai E. u. 6-8., Sopron, H-9400, Hungary Department of Atmospheric and Oceanic Sciences, University of California, 405 Hilgard Ave, Los Angeles, CA 90095, United States Geographical Institute, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Budaörsi út 45., Budapest, H-1112, Hungary Department of Geology and Meteorology, University of Pécs, Ifjúság u. 6., Pécs, H-7624, Hungary Environmental Analytical and Geoanalytical Laboratory, Szentágothai Research Centre, University of Pécs, Ifjúság u. 20., Pécs, H-7624, Hungary Cited By :87 Export Date: 16 February 2021 Correspondence Address: Újvári, G.; Institute for Geological and Geochemical Research, Budaörsi u. 45., Hungary; email: ujvari.gabor@csfk.mta.hu Funding details: Magyar Tudományos Akadémia, MTA, BO/00326/15/10 ) Funding details: Hungarian Scientific Research Fund, OTKA Funding details: Hungarian Scientific Research Fund, OTKA, PD-108639 Funding text 1: This work has been funded by a post doc project from the Hungarian Scientific Research Fund to GÚ ( OTKA PD-108639 ). Additional financial support provided by the Bolyai János Research Scholarship of the Hungarian Academy of Sciences ( BO/00326/15/10 ) (GÚ, GV) is gratefully acknowledged. Constructive and insightful comments by Joe Mason and Thomas Stevens improved this paper substantially. Editorial handling and comments by Ian Candy is appreciated. AB - Loess deposits are recorders of aeolian activity during past glaciations. Since the size distribution of loess deposits depends on distance to the dust source, and environmental conditions at the source, during transport, and at deposition, loess particle size distributions and derived statistical measures are widely used proxies in Quaternary paleoenvironmental studies. However, the interpretation of these proxies often only considers dust transport processes. To move beyond such overly simplistic proxy interpretations, and toward proxy interpretations that consider the range of environmental processes that determine loess particle size distribution variations we provide a comprehensive review on the physics of dust particle mobilization and deposition. Furthermore, using high-resolution bulk loess and quartz grain size datasets from a last glacial/interglacial sequence, we show that, because grain size distributions are affected by multiple, often stochastic processes, changes in these distributions over time allow multiple interpretations for the driving processes. Consequently, simplistic interpretations of proxy variations in terms of only one factor (e.g. wind speed) are likely to be inaccurate. Nonetheless using loess proxies to understand temporal changes in the dust cycle and environmental parameters requires (i) a careful site selection, to minimize the effects of topography and source distance, and (ii) the joint use of bulk and quartz grain size proxies, together with high resolution mass accumulation rate calculations if possible. © 2016 Elsevier B.V. LA - English DB - MTMT ER - TY - JOUR AU - Centeri, Csaba AU - Jakab, Gergely Imre AU - Szabó, Szilárd AU - Farsang, Andrea AU - Barta, Károly AU - Szalai, Zoltán AU - Biró, Zsolt TI - Comparison of particle-size analyzing laboratory methods JF - ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL J2 - ENVIRON ENG MANAG J VL - 14 PY - 2015 IS - 5 SP - 1125 EP - 1135 PG - 11 SN - 1582-9596 UR - https://m2.mtmt.hu/api/publication/2899755 ID - 2899755 LA - English DB - MTMT ER - TY - JOUR AU - Centeri, Csaba AU - Szalai, Zoltán AU - Jakab, Gergely Imre AU - Barta, Károly AU - Farsang, Andrea AU - Szabó, Szilárd AU - Biró, Zsolt TI - Soil erodibility calculations based on different particle size distribution measurements JF - HUNGARIAN GEOGRAPHICAL BULLETIN (2009-) J2 - HUNG GEOGR BULL (2009-) VL - 64 PY - 2015 IS - 1 SP - 17 EP - 23 PG - 7 SN - 2064-5031 DO - 10.15201/hungeobull.64.1.2 UR - https://m2.mtmt.hu/api/publication/2885054 ID - 2885054 N1 - Department of Nature Conservation and Landscape Ecology, Institute of Environmental and Landscape Management, Szent István University, Páter K. u. 1, Gödöllő, H-2100, Hungary Geographical Institute, Research Centre for Astronomy and Earth Sciences, HAS, Budaörsi út 45, Budapest, H-1112, Hungary Department of Physical Geography and Geoinfor-matics, University of Szeged, Egyetem u. 2, Szeged, H-6720, Hungary Department of Physical Geography and Geoinfor-mation Systems, Debrecen University, Egyetem tér 1, Debrecen, H-4032, Hungary Institute for Wildlife Conservation, Szent István University, Páter K. u. 1, Gödöllő, H-2100, Hungary Cited By :8 Export Date: 6 September 2019 Department of Nature Conservation and Landscape Ecology, Institute of Environmental and Landscape Management, Szent István University, Páter K. u. 1, Gödöllő, H-2100, Hungary Geographical Institute, Research Centre for Astronomy and Earth Sciences, HAS, Budaörsi út 45, Budapest, H-1112, Hungary Department of Physical Geography and Geoinfor-matics, University of Szeged, Egyetem u. 2, Szeged, H-6720, Hungary Department of Physical Geography and Geoinfor-mation Systems, Debrecen University, Egyetem tér 1, Debrecen, H-4032, Hungary Institute for Wildlife Conservation, Szent István University, Páter K. u. 1, Gödöllő, H-2100, Hungary Cited By :14 Export Date: 27 October 2020 LA - English DB - MTMT ER -