Articles | Volume 4, issue 2
https://doi.org/10.5194/gi-4-189-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/gi-4-189-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Global trend analysis of the MODIS drought severity index
P. I. Orvos
Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary
Regional Research Center, Eötvös Loránd University, Székesfehérvár, Hungary
V. Homonnai
Regional Research Center, Eötvös Loránd University, Székesfehérvár, Hungary
A. Várai
Department of Physics of Complex Systems, Eötvös Loránd University, Budapest, Hungary
Z. Bozóki
MTA-SZTE Research Group on Photoacoustic Spectroscopy, University of Szeged, Szeged, Hungary
I. M. Jánosi
Regional Research Center, Eötvös Loránd University, Székesfehérvár, Hungary
Department of Physics of Complex Systems, Eötvös Loránd University, Budapest, Hungary
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Imre M. Jánosi, Holger Kantz, Jason A. C. Gallas, and Miklós Vincze
Ocean Sci., 18, 1361–1375, https://doi.org/10.5194/os-18-1361-2022, https://doi.org/10.5194/os-18-1361-2022, 2022
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Surface flow fields of the global oceans are dominated by so-called mesoscale (50–300 km) eddies. They usually drift westward at a few kilometers per day, transporting mass, temperature, chlorophyll, and debris. There are several methods to identify and track eddies based on satellite measurements, some of them very computationally demanding. Here we extend a recently proposed simple procedure to the global scale, which gives quick coarse-grained statistics on mesoscale vortex properties.
Imre M. Jánosi, Amin Padash, Jason A. C. Gallas, and Holger Kantz
Ocean Sci., 18, 307–320, https://doi.org/10.5194/os-18-307-2022, https://doi.org/10.5194/os-18-307-2022, 2022
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Spectacular climatic phenomena such as El Nino—La Nina oscillations are connected with large-scale rearrangements of oceanic surface flow patterns. In order to get a better insight into the dynamics of such changes, we performed numerical experiments on the advection of 6600 water parcels in the focal area. Surface flow fields were taken from the AVISO data bank. A simple stochastic model (fractional Brownian motion) with only two parameters nicely reproduced the statistics of advection.
Karim Medjdoub, Imre M. Jánosi, and Miklós Vincze
Ocean Sci., 17, 997–1009, https://doi.org/10.5194/os-17-997-2021, https://doi.org/10.5194/os-17-997-2021, 2021
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In our laboratory experiments we addressed the question of how surface standing waves in a closed stratified basin are damped by the interaction of the flow in the bulk with a sill-like bottom obstacle reaching up to a density interface between the more saline deep layer and the freshwater layer at the top. We quantify the decay rates of the surface waves and explore what types of internal waves can be excited in this process along the internal density interface.
Imre M. Jánosi, Miklós Vincze, Gábor Tóth, and Jason A. C. Gallas
Ocean Sci., 15, 941–949, https://doi.org/10.5194/os-15-941-2019, https://doi.org/10.5194/os-15-941-2019, 2019
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Mesoscale eddies are ubiquitous swirling flow patterns in the open ocean with diameters of around 100 km. They transport a huge amount of heat and material and are therefore key elements of the “weather” of the ocean. Using satellite-based ocean surface elevation, we found that the combined global effect of all mesoscale eddies can be treated as a single strong “super-vortex”. This finding can be helpful to estimate the energy budget of ocean regions where only sparse field data are available.
Annette Filges, Christoph Gerbig, Chris W. Rella, John Hoffnagle, Herman Smit, Martina Krämer, Nicole Spelten, Christian Rolf, Zoltán Bozóki, Bernhard Buchholz, and Volker Ebert
Atmos. Meas. Tech., 11, 5279–5297, https://doi.org/10.5194/amt-11-5279-2018, https://doi.org/10.5194/amt-11-5279-2018, 2018
Ádám Tóth, András Hoffer, Mihály Pósfai, Tibor Ajtai, Zoltán Kónya, Marianne Blazsó, Zsuzsanna Czégény, Gyula Kiss, Zoltán Bozóki, and András Gelencsér
Atmos. Chem. Phys., 18, 10407–10418, https://doi.org/10.5194/acp-18-10407-2018, https://doi.org/10.5194/acp-18-10407-2018, 2018
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Atmospheric tar balls are abundant particles in biomass smoke and some of them were shown to be strongly light-absorbing. Being able to synthesize pure tar balls in the laboratory we deployed various analytical techniques to determine the chemical characteristics of these tar balls and to compare them with those of other light-absorbing particle types such as soot (black carbon, BC). The results have relevance in better representing these specific smoke particles in global climate models.
Imre Salma, Zoltán Németh, Tamás Weidinger, Willy Maenhaut, Magda Claeys, Mihály Molnár, István Major, Tibor Ajtai, Noémi Utry, and Zoltán Bozóki
Atmos. Chem. Phys., 17, 13767–13781, https://doi.org/10.5194/acp-17-13767-2017, https://doi.org/10.5194/acp-17-13767-2017, 2017
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The major finding of this study lies in the new pragmatic coupled radiocarbon–LVG apportionment scheme, which allows assessment of the contribution of the major carbonaceous species from fossil fuel combustion, biomass burning and biogenic sources with a reasonable uncertainty, and without coupling of thermal or separation methods with an AMS for rather small amounts of samples.
T. Ajtai, N. Utry, M. Pintér, G. Kiss-Albert, R. Puskás, Cs. Tápai, G. Kecskeméti, T. Smausz, B. Hopp, Z. Bozóki, Z. Kónya, and G. Szabó
Atmos. Meas. Tech., 8, 1207–1215, https://doi.org/10.5194/amt-8-1207-2015, https://doi.org/10.5194/amt-8-1207-2015, 2015
N. Utry, T. Ajtai, M. Pintér, E. Tombácz, E. Illés, Z. Bozóki, and G. Szabó
Atmos. Meas. Tech., 8, 401–410, https://doi.org/10.5194/amt-8-401-2015, https://doi.org/10.5194/amt-8-401-2015, 2015
D. Tátrai, Z. Bozóki, H. Smit, C. Rolf, N. Spelten, M. Krämer, A. Filges, C. Gerbig, G. Gulyás, and G. Szabó
Atmos. Meas. Tech., 8, 33–42, https://doi.org/10.5194/amt-8-33-2015, https://doi.org/10.5194/amt-8-33-2015, 2015
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Airborne hygrometry is very important in climate research, and the interest in knowing not only water vapor concentration but (cirrus) cloud content as well is increasing. The authors provide a photoacoustic spectroscopy-based dual-channel hygrometer system that can be a good solution for such measurements. The instrument was proven to operate properly from ground level up to the lower stratosphere, giving the possibility even for cirrus cloud studies.
D. W. Fahey, R.-S. Gao, O. Möhler, H. Saathoff, C. Schiller, V. Ebert, M. Krämer, T. Peter, N. Amarouche, L. M. Avallone, R. Bauer, Z. Bozóki, L. E. Christensen, S. M. Davis, G. Durry, C. Dyroff, R. L. Herman, S. Hunsmann, S. M. Khaykin, P. Mackrodt, J. Meyer, J. B. Smith, N. Spelten, R. F. Troy, H. Vömel, S. Wagner, and F. G. Wienhold
Atmos. Meas. Tech., 7, 3177–3213, https://doi.org/10.5194/amt-7-3177-2014, https://doi.org/10.5194/amt-7-3177-2014, 2014
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Single point positioning with vertical total electron content estimation based on single-epoch data
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Artur Fischer, Sławomir Cellmer, and Krzysztof Nowel
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A simple and autonomous ionospheric correction estimation method in SPP allows independence from external products delivering information on the ionospheric delay. The elaborated mathematical model improves navigation solutions in reference to the SPP approach with the Klobuchar algorithm and ensures results on a similar level compared to the IGS TEC map. The numerical experiment was carried out utilizing real GNSS code data and a MATLAB environment.
P. Zhu, M. van Ruymbeke, Ö. Karatekin, J.-P. Noël, G. Thuillier, S. Dewitte, A. Chevalier, C. Conscience, E. Janssen, M. Meftah, and A. Irbah
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The PICARD Bolometric Oscillation Sensor experiment was the first experiment to simultaneously measure the solar and terrestrial radiation with a single detector. It is a powerful tool for exploring thermal properties of a planetary body. The sensor has high repeatability due to its simplified design. Thus, it has the potential to payload on several microsatellites or even CubeSats and form a consultation array to track small energy exchange of the planet.
A. Kestilä, T. Tikka, P. Peitso, J. Rantanen, A. Näsilä, K. Nordling, H. Saari, R. Vainio, P. Janhunen, J. Praks, and M. Hallikainen
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Short summary
The remotely sensed drought severity index (DSI) records compiled by Mu et al. (2013) exhibit significant local trends in several geographic areas. Since the interpretation of DSI values and trends depend on several local factors, standard field significance tests cannot provide more reliable results than the presented local trend survey. The observed continent-wide trends might be related to a slow (decadal) mode of climate variability, a link to global climate change cannot be established.
The remotely sensed drought severity index (DSI) records compiled by Mu et al. (2013) exhibit...