Articles | Volume 15, issue 4
https://doi.org/10.5194/os-15-941-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-15-941-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Single super-vortex as a proxy for ocean surface flow fields
Department of Physics of Complex Systems, Eötvös Loránd University, Pázmány Péter s. 1/A, 1117 Budapest, Hungary
Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany
von Kármán Laboratory for Environmental Flows, Eötvös Loránd University, Pázmány Péter s. 1/A, 1117 Budapest, Hungary
Miklós Vincze
von Kármán Laboratory for Environmental Flows, Eötvös Loránd University, Pázmány Péter s. 1/A, 1117 Budapest, Hungary
MTA-ELTE Theoretical Physics Research Group, Pázmány Péter s. 1/A, 1117 Budapest, Hungary
Gábor Tóth
Department of Physics of Complex Systems, Eötvös Loránd University, Pázmány Péter s. 1/A, 1117 Budapest, Hungary
Jason A. C. Gallas
Max Planck Institute for the Physics of Complex Systems, Nöthnitzer Str. 38, 01187 Dresden, Germany
Complexity Sciences Center, 9225 Collins Avenue Suite 1208, Surfside, FL 33154, USA
Instituto de Altos Estudos da Paraíba, Rua Silvino Lopes 419-2502, 58039-190 João Pessoa, Brazil
Related authors
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.
P. I. Orvos, V. Homonnai, A. Várai, Z. Bozóki, and I. M. Jánosi
Geosci. Instrum. Method. Data Syst., 4, 189–196, https://doi.org/10.5194/gi-4-189-2015, https://doi.org/10.5194/gi-4-189-2015, 2015
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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.
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
Short summary
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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.
Costanza Rodda, Uwe Harlander, and Miklos Vincze
Weather Clim. Dynam., 3, 937–950, https://doi.org/10.5194/wcd-3-937-2022, https://doi.org/10.5194/wcd-3-937-2022, 2022
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We report on a set of laboratory experiments that reproduce a global warming scenario. The experiments show that a decreased temperature difference between the poles and subtropics slows down the eastward propagation of the mid-latitude weather patterns. Another consequence is that the temperature variations diminish, and hence extreme temperature events might become milder in a global warming scenario. Our experiments also show that the frequency of such events increases.
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
Short summary
Short summary
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
Short summary
Short summary
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.
P. I. Orvos, V. Homonnai, A. Várai, Z. Bozóki, and I. M. Jánosi
Geosci. Instrum. Method. Data Syst., 4, 189–196, https://doi.org/10.5194/gi-4-189-2015, https://doi.org/10.5194/gi-4-189-2015, 2015
Short summary
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.
Related subject area
Approach: Analytic Theory | Depth range: Surface | Geographical range: All Geographic Regions | Phenomena: Current Field
The Ekman spiral for piecewise-uniform viscosity
Technical note: Two types of absolute dynamic ocean topography
David G. Dritschel, Nathan Paldor, and Adrian Constantin
Ocean Sci., 16, 1089–1093, https://doi.org/10.5194/os-16-1089-2020, https://doi.org/10.5194/os-16-1089-2020, 2020
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Ekman's (1905) solution for how wind affects ocean surface currents is revisited and extended analytically for a piecewise-constant profile of vertical diffusion. This allows a comprehensive understanding of how the surface current deflection angle relative to the wind direction varies with the profile of vertical diffusion.
Peter C. Chu
Ocean Sci., 14, 947–957, https://doi.org/10.5194/os-14-947-2018, https://doi.org/10.5194/os-14-947-2018, 2018
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Two types of marine geoid exist with the first type being the average level of sea surface height if the water is at rest (classical definition), and the second type being satellite-determined with the condition that the water is usually not at rest. The associated absolute dynamic ocean topography (DOT) also has two types. Horizontal gradients of the two DOTs are different with the 1st (2nd) type representing the absolute (relative) surface geostrophic currents.
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Short summary
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.
Mesoscale eddies are ubiquitous swirling flow patterns in the open ocean with diameters of...