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487 results on '"Kern, Stefan"'

1. Delivering Sustained, Coordinated, and Integrated Observations of the Southern Ocean for Global Impact

Author

Newman, Louise, Heil, Petra, Trebilco, Rowan, Katsumata, Katsuro, Constable, Andrew, van Wijk, Esmee, Assmann, Karen, Beja, Joana, Bricher, Phillippa, Colemans, Richard, Costa, Daniel, Diggs, Steve, Farneti, Riccardo, Fawcett, Sarah, Gille, Sarah T, Hendry, Katharine R, Henley, Sian, Hofmann, Eileen, Maksym, Ted, MazIoff, Matthew, Meijers, Andrew, Meredith, Michael M, Moreau, Sebastian, Ozsor, Burcu, Robertson, Robin, Schloss, Irene, Schofield, Oscar, Shi, Jiuxin, Sikes, Elisabeth, Smith, Inga J, Swart, Sebastiaan, Wahlin, Anna, Williams, Guy, Williams, Michael JM, Herraiz-Borreguero, Laura, Kern, Stefan, Liesers, Jan, Massom, Robert A, Melbourne-Thomas, Jessica, Miloslavich, Patricia, and Spreen, Gunnar

Subjects
Southern Ocean, observations, modeling, ocean-climate interactions, ecosystem-based management, long-term monitoring, international coordination, Oceanography, Ecology
Published
2019

5. Curriculum Prothetik: Band 3

Author

Matthias Kern, Stefan Wolfart, Guido Heydecke, Siegbert Witkowski, Jens Christoph Türp, Jörg R. Strub and Matthias Kern, Stefan Wolfart, Guido Heydecke, Siegbert Witkowski, Jens Christoph Türp, Jörg R. Strub

Published
2022

6. Curriculum Prothetik: Band 1

Author

Matthias Kern, Stefan Wolfart, Guido Heydecke, Siegbert Witkowski, Jens Christoph Türp, Jörg R. Strub and Matthias Kern, Stefan Wolfart, Guido Heydecke, Siegbert Witkowski, Jens Christoph Türp, Jörg R. Strub

Published
2022

9. Estimating the uncertainty of sea-ice area and sea-ice extent from satellite retrievals.

Author

Wernecke, Andreas, Notz, Dirk, Kern, Stefan, and Lavergne, Thomas

Subjects
ICE navigation, MICROWAVE measurements, SEA ice, GLOBAL warming, MICROWAVES
Abstract

The net Arctic sea-ice area (SIA) can be estimated from the sea-ice concentration (SIC) by passive microwave measurements from satellites. To be a truly useful metric, for example of the sensitivity of the Arctic sea-ice cover to global warming, we need, however, reliable estimates of its uncertainty. Here we retrieve this uncertainty by taking into account the spatial and temporal error correlations of the underlying local sea-ice concentration products. As 1 example year, we find that in 2015 the average observational uncertainties of the SIA are 306 000 km 2 for daily estimates, 275 000 km 2 for weekly estimates, and 164 000 km 2 for monthly estimates. The sea-ice extent (SIE) uncertainty for that year is slightly smaller, with 296 000 km 2 for daily estimates, 261 000 km 2 for weekly estimates, and 156 000 km 2 for monthly estimates. These daily uncertainties correspond to about 7 % of the 2015 sea-ice minimum and are about half of the spread in estimated SIA and SIE from different passive microwave SIC products. This shows that random SIC errors play a role in SIA uncertainties comparable to inter-SIC-product biases. We further show that the September SIA, which is traditionally the month with the least amount of Arctic sea ice, declined by 105000±9000 km 2 a -1 for the period from 2002 to 2017. This is the first estimate of a SIA trend with an explicit representation of temporal error correlations. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Optimization of Aircraft Wake Alleviation Schemes through an Evolution Strategy

Author

Chatelain, Philippe, Gazzola, Mattia, Kern, Stefan, Koumoutsakos, Petros, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Palma, José M. Laginha M., editor, Daydé, Michel, editor, Marques, Osni, editor, and Lopes, João Correia, editor

Published
2011
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28. Frequenzmessung

Author

Thumm, Manfred, Wiesbeck, Werner, Kern, Stefan, Thumm, Manfred, Wiesbeck, Werner, and Kern, Stefan

Published
1998
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32. Meßgeneratoren

Author

Thumm, Manfred, Wiesbeck, Werner, Kern, Stefan, Thumm, Manfred, Wiesbeck, Werner, and Kern, Stefan

Published
1998
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33. Leistungsmessung

Author

Thumm, Manfred, Wiesbeck, Werner, Kern, Stefan, Thumm, Manfred, Wiesbeck, Werner, and Kern, Stefan

Published
1998
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34. Einleitung

Author

Thumm, Manfred, Wiesbeck, Werner, Kern, Stefan, Thumm, Manfred, Wiesbeck, Werner, and Kern, Stefan

Published
1998
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37. Einleitung

Author

Thumm, Manfred, Wiesbeck, Werner, Kern, Stefan, Thumm, Manfred, Wiesbeck, Werner, and Kern, Stefan

Published
1997
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40. Frequenzmessung

Author

Thumm, Manfred, Wiesbeck, Werner, Kern, Stefan, Thumm, Manfred, Wiesbeck, Werner, and Kern, Stefan

Published
1997
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42. Leistungsmessung

Author

Thumm, Manfred, Wiesbeck, Werner, Kern, Stefan, Thumm, Manfred, Wiesbeck, Werner, and Kern, Stefan

Published
1997
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44. Meßgeneratoren

Author

Thumm, Manfred, Wiesbeck, Werner, Kern, Stefan, Thumm, Manfred, Wiesbeck, Werner, and Kern, Stefan

Published
1997
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47. Sea-ice transport driving Southern Ocean salinity and its recent trends

Author

Haumann, F. Alexander, Gruber, Nicolas, Mnnich, Matthias, Frenger, Ivy, and Kern, Stefan

Subjects
Sea ice -- Research, Fresh water -- Research, Climate change -- Research, Upwelling (Oceanography) -- Research, Salinity -- Research, Oceanographic research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): F. Alexander Haumann (corresponding author) [1, 2]; Nicolas Gruber [1, 2]; Matthias Mnnich [1]; Ivy Frenger [1, 3]; Stefan Kern [4] Recent salinity changes in the Southern Ocean [1, [...]

Published
2016
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48. Local Meta-models for Optimization Using Evolution Strategies

Author

Kern, Stefan, Hansen, Nikolaus, Koumoutsakos, Petros, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Runarsson, Thomas Philip, editor, Beyer, Hans-Georg, editor, Burke, Edmund, editor, Merelo-Guervós, Juan J., editor, Whitley, L. Darrell, editor, and Yao, Xin, editor

Published
2006
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49. A New Structure for the Sea Ice Essential Climate Variables of the Global Climate Observing System

Author

Lavergne, Thomas, primary, Kern, Stefan, additional, Aaboe, Signe, additional, Derby, Lauren, additional, Dybkjaer, Gorm, additional, Garric, Gilles, additional, Heil, Petra, additional, Hendricks, Stefan, additional, Holfort, Jürgen, additional, Howell, Stephen, additional, Key, Jeffrey, additional, Lieser, Jan L, additional, Maksym, Ted, additional, Maslowski, Wieslaw, additional, Meier, Walt, additional, Muñoz-Sabater, Joaquín, additional, Nicolas, Julien, additional, Özsoy, Burcu, additional, Rabe, Benjamin, additional, Rack, Wolfgang, additional, Raphael, Marilyn, additional, de Rosnay, Patricia, additional, Smolyanitsky, Vasily, additional, Tietsche, Steffen, additional, Ukita, Jinro, additional, Vichi, Marcello, additional, Wagner, Penelope, additional, Willmes, Sascha, additional, and Zhao, Xi, additional

Published
2022
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50. A Mixed Bayesian Optimization Algorithm with Variance Adaptation

Author

Ocenasek, Jiri, Kern, Stefan, Hansen, Nikolaus, Koumoutsakos, Petros, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Yao, Xin, editor, Burke, Edmund K., editor, Lozano, José A., editor, Smith, Jim, editor, Merelo-Guervós, Juan Julián, editor, Bullinaria, John A., editor, Rowe, Jonathan E., editor, Tiňo, Peter, editor, Kabán, Ata, editor, and Schwefel, Hans-Paul, editor

Published
2004
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