Dr. Tobias Jonas

Fonction

chef de groupe

Neige et atmosphère

Hydrologie nivale

Contact

jonas(at)slfto make life hard for spam bots.ch

+41 81 417 02 59+41 81 417 02 59

Institut fédéral pour l'étude de la neige et des avalanches SLF
Flüelastrasse 11
7260 Davos Dorf

Site

Davos Da B 2 12

Reseach Interests

Monitoring and modeling of snow water resources and melt water discharge from alpine basins

Development and verification of snow hydrological models

Climate change effects on catchment hydrology

Snow-vegetation interactions, forest-snow hydrology

Operational snow hydrology, snow climatology

Development of GPR methodology for snow surveys

FURTHER INFORMATION

Publications WSL

Scientific publication article peer reviewed

Haugeneder, M.; Lehning, M.; Reynolds, D.; Jonas, T.; Mott, R., 2023: A novel method to quantify near-surface boundary-layer dynamics at ultra-high spatio-temporal resolution. Boundary-Layer Meteorology, 186: 177-197. doi: 10.1007/s10546-022-00752-3

Schirmer, M.; Winstral, A.; Jonas, T.; Burlando, P.; Peleg, N., 2022: Natural climate variability is an important aspect of future projections of snow water resources and rain-on-snow events. Cryosphere, 16, 9: 3469-3488. doi: 10.5194/tc-16-3469-2022

De Lannoy, G.J.M.; Bechtold, M.; Albergel, C.; Brocca, L.; Calvet, J.; Carrassi, A.; Crow, W.T.; De Rosnay, P.; Durand, M.; Forman, B.; Geppert, G.; Girotto, M.; Hendricks Franssen, H.; Jonas, T.; Kumar, S.; Lievens, H.; Lu, Y.; Massari, C.; Pauwels, V.R.N.; ... Steele-Dunne, S., 2022: Perspective on satellite-based land data assimilation to estimate water cycle components in an era of advanced data availability and model sophistication. Frontiers in Water, 4: 981745 (14 pp.). doi: 10.3389/frwa.2022.981745

Koutantou, K.; Mazzotti, G.; Brunner, P.; Webster, C.; Jonas, T., 2022: Exploring snow distribution dynamics in steep forested slopes with UAV-borne LiDAR. Cold Regions Science and Technology, 200: 103587 (15 pp.). doi: 10.1016/j.coldregions.2022.103587

Lievens, H.; Brangers, I.; Marshall, H.P.; Jonas, T.; Olefs, M.; De Lannoy, G., 2022: Sentinel-1 snow depth retrieval at sub-kilometer resolution over the European Alps. Cryosphere, 16, 1: 159-177. doi: 10.5194/tc-16-159-2022

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Further scientific publications

Bauder, A.; Mazzotti, G.; Berger, C.; Langhammer, L.; Griessinger, N.; Jonas, T., 2018: Winter accumulation measurements on alpine glaciers using ground penetrating radar. In: 2018: 2018 17th international conference on ground penetrating radar (GPR 2018). 17th international conference on ground penetrating radar (GPR 2018), Rapperswil, Switzerland. (5 pp.). doi: 10.1109/ICGPR.2018.8441559

Helbig, N.; Ehrler, M.; Schirmer, M.; Jonas, T., 2018: Where is the snow: validating a fractional-snow covered area parameterization for snow melt forecasting with satellite measurements. In: 2018: International snow science workshop proceedings 2018. International snow science workshop, ISSW 2018, Innsbruck. 357-360.

Helbig, N.; Van Herwijnen, A.; Jonas, T., 2016: Deriving mean snow depth in complex terrain from flat field measurements. In: 2016: International snow science workshop proceedings 2016. International snow science workshop, ISSW 2016, Breckenridge, CO, USA, October 2-7, 2016. 707-712.

Bellaire, S.; Van Herwijnen, A.; Mitterer, C.; Helbig, N.; Jonas, T.; Schweizer, J., 2016: Regional forecasting of wet snow avalanche cycles: an essential tool for avalanche warning services?. In: 2016: International snow science workshop proceedings 2016. International snow science workshop, ISSW 2016, Breckenridge, CO, USA, October 2-7, 2016. 140-147.

Helbig, N.; Techel, F.; Van Herwijnen, A.; Jonas, T., 2014: Linking large-scale wet-snow spatial patterns in mountainous terrain to incident radiation and topography. In: 2014: International snow science workshop proceedings 2014. International snow science workshop, ISSW 2014, Banff, AB, Canada, September 29 - October 3, 2014. 456-460.

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Magazine article and brochures

Würzer, S.; Jonas, T., 2017: Der Einfluss von Schneedeckeneigenschaften auf die Abflussgenerierung während Regen-auf-Schnee-Ereignissen. Wasser, Energie, Luft, 109, 2: 197-202.

Steinkogler, W.; Lehning, M.; Sovilla, B.; Jonas, T., 2014: L'energia termica nelle valanghe. Neve e Valanghe, 82: 16-21.

Jonas, T.; Stähli, M., 2013: Bodenfeuchte und Abfluss aus der Schneedecke - Messnetze, Methoden und operationelle Produkte. FAN Agenda, Fachleute Naturgefahren Schweiz, 6-8.

Job, D.; Angehrn, S.; Helland, E.; Rietmann, D.; Schneider, R.; Dupraz, C.; Mueller, C.; Boogen, N.; Spreng, D.; Widmer, F.; Hänggi, P.; Weingartner, R.; Haeberli, W.; Linsbauer, A.; Paul, F.; Bosshard, T.; Ewen, T.; Kotlarski, S.; Schär, C.; ... Zappa, M., 2011: Auswirkungen der Klimaänderung auf die Wasserkraftnutzung - Synthesebericht. Beiträge zur Hydrologie der Schweiz, 38. Auswirkungen der Klimaänderung auf die Wasserkraftnutzung - Synthesebericht, . 26 p.

Huggel, C.; Salzmann, N.; Angulo, L.; Calanca, P.; Díaz, A.; Encinas, C.; Jonas, T.; Juárez, H.; Jurt, C.; Konzelmann, T.; Lagos, P.; Robledo, C.; Rohrer, M.; Silverio, W.; Zappa, M., 2009: A new Peruvian-Swiss program on climate change adaptation: advancing towards integrated climate change research, implementation and science-policy dialogue. The Andes: highly vulnerable to climate change. Mountain Research Initiative Newsletter, 9-12.

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Earlier publications

Selected publications from previous research

Jonas, T., A. Stips, W. Eugster, and A. Wüest (2003). Observations of a quasi shear-free lacustrine convective boundary layer: Stratification and its implications on turbulence. J. Geophys. Res.-Oceans, 108 (C10): art. no. 3328 (abstract)

Eugster, W., G. Kling, T. Jonas, J.P. McFadden, A. Wüest, S. MacIntyre, and F.S. Chapin III (2003). CO₂ exchange between air and water in an Arctic Alaskan and midlatitude Swiss lake: Importance of convective mixing. J. Geophys. Res.-Atmos., 108 (D12): art. no. 4362 (abstract)

Jonas, T., A. Terzevik, D. Mironov, and A. Wüest (2003). Radiatively driven convection in an ice-covered lake investigated by using temperature microstructure technique. J. Geophys. Res.-Oceans, 108 (C6): art. no. 3183 (abstract)

Mironov, D., A. Terzhevik, G. Kirilin, T. Jonas, J. Malm, and D. Farmer (2002). Radiatively driven convection in ice-covered lakes: Observations, scaling, and a mixed layer model. J. Geophys. Res.-Oceans, 107 (C4): art. no. 3032 (download)

Lorke, A., L. Umlauf, T. Jonas, and A. Wüest (2002). Dynamics of turbulence in low-speed oscillating bottom-boundary layers of stratified basins. Environ. Fluid Dynamics, 291-313 (abstract)

Sander, J., A. Simon, T. Jonas, and A. Wüest (2000). Surface turbulence in natural waters: A comparison of large eddy simulations with microstructure observations. J. Geophys. Res.-Oceans, 105 (C1): 1195-1207

Jonas, T. (2001). Convective mixing processes in natural waters. Ph.D. thesis, Eidg. Tech. Hochschule, Zürich, Switzerland, No. 14339

Jonas, T., 1996. Transiente Phänomene beim Tropfenaufprall auf temperierte Wände. Diplomathesis, Georg-August-Universität, Göttingen, Germany

My CV

Career

2006 until now: Head of Snow Hydrology Research Group at the WSL. The research group is based in Davos (SLF).

2002 – 2006: Scientific Staff of the WSL at the Swiss Federal Institute for Snow and Avalanche Research SLF in Davos. Research focus on Snow meteorology and snow ecology.

2001 – 2002: Scientific Staff of the Swiss Federal Institute of Aquatic Science and Technology (Eawag) in Dübendorf. Research focus on Aquatic Physics.

1997 – 2001: PhD student at the Swiss Federal Institute of Aquatic Science and Technology (Eawag) in Dübendorf. Title of thesis: "Convective mixing processes in natural water bodies".

1997: Research Fellow at Technical University of Freiberg. Research focus on technical fluid dynamics.

1995 – 1996: Research Assistant at Max-Planck-Institut of Fluid Mechanics in Göttingen. Research focus on technical fluid dynamics.

Education

2001: Ph.D., Department of Environmental Sciences, Swiss Federal Institute of Technology Zurich (ETHZ). Title of thesis: "Convective mixing processes in natural water bodies".

1996: Diploma in Physics, Fluid Dynamics Institute, Georg-August University Göttingen (GAU). Title of thesis: "Transient break-up mechanisms of drops impinging on heated walls (in german)".