Dr. Tobias Jonas
Fonction
chef de groupe
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 14
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
Jonas, T.; Webster, C.; Mazzotti, G.; Malle, J., 2020: HPEval: a canopy shortwave radiation transmission model using high-resolution hemispherical images. Agricultural and Forest Meteorology, 284: 107903 (9 pp.). doi: 10.1016/j.agrformet.2020.107903
Mazzotti, G.; Essery, R.; Moeser, C.D.; Jonas, T., 2020: Resolving small‐scale forest snow patterns using an energy‐balance snow model with a 1‐layer canopy. Water Resources Research, doi: 10.1029/2019WR026129
Lievens, H.; Demuzere, M.; Marshall, H.; Reichle, R.H.; Brucker, L.; Brangers, I.; De Rosnay, P.; Dumont, M.; Girotto, M.; Immerzeel, W.W.; Jonas, T.; Kim, E.J.; Koch, I.; Marty, C.; Saloranta, T.; Schöber, J.; De Lannoy, G.J.M., 2019: Snow depth variability in the Northern Hemisphere mountains observed from space. Nature Communications, 10: 4629 (12 pp.). doi: 10.1038/s41467-019-12566-y
Griessinger, N.; Schirmer, M.; Helbig, N.; Winstral, A.; Michel, A.; Jonas, T., 2019: Implications of observation-enhanced energy-balance snowmelt simulations for runoff modeling of Alpine catchments. Advances in Water Resources, 133: 103410 (12 pp.). doi: 10.1016/j.advwatres.2019.103410
Mazzotti, G.; Malle, J.; Barr, S.; Jonas, T., 2019: Spatially continuous characterization of forest canopy structure and sub-canopy irradiance derived from handheld radiometer surveys. Journal of Hydrometeorology, 1417-1433. doi: 10.1175/JHM-D-18-0158.1
Lüthi, S.; Ban, N.; Kotlarski, S.; Steger, C.R.; Jonas, T.; Schär, C., 2019: Projections of Alpine snow-cover in a high-resolution climate simulation. Atmosphere, 10, 8: 463 (18 pp.). doi: 10.3390/atmos10080463
Winstral, A.; Magnusson, J.; Schirmer, M.; Jonas, T., 2019: The bias detecting ensemble: a new and efficient technique for dynamically incorporating observations into physics‐based, multi‐layer, snow models. Water Resources Research, 55: 613-631. doi: 10.1029/2018WR024521
Malle, J.; Rutter, N.; Mazzotti, G.; Jonas, T., 2019: Shading by trees and fractional snow cover control the subcanopy radiation budget. Journal of Geophysical Research D: Atmospheres, 3195-3207. doi: 10.1029/2018JD029908
Zellweger, F.; Baltensweiler, A.; Schleppi, P.; Huber, M.; Küchler, M.; Ginzler, C.; Jonas, T., 2019: Estimating below‐canopy light regimes using airborne laser scanning: an application to plant community analysis. Ecology and Evolution, 9, 16: 9149-9159. doi: 10.1002/ece3.5462
Currier, W.R.; Pflug, J.; Mazzotti, G.; Jonas, T.; Deems, J.S.; Bormann, K.J.; Painter, T.H.; Hiemstra, C.A.; Gelvin, A.; Uhlmann, Z.; Spaete, L.; Glenn, N.F.; Lundquist, J.D., 2019: Comparing aerial lidar observations with terrestrial lidar and snow‐probe transects from NASA's 2017 SnowEx campaign. Water Resources Research, 55, 7: 6285-6294. doi: 10.1029/2018WR024533
Mazzotti, G.; Currier, W.R.; Deems, J.S.; Pflug, J.M.; Lundquist, J.D.; Jonas, T., 2019: Revisiting snow cover variability and canopy structure within forest stands: insights from airborne lidar data. Water Resources Research, 55, 7: 6198-6216. doi: 10.1029/2019WR024898
Würzer, S.; Jonas, T., 2018: Spatio-temporal aspects of snowpack runoff formation during rain on snow. Hydrological Processes, 32, 23: 3434-3445. doi: 10.1002/hyp.13240
Webster, C.; Jonas, T., 2018: Influence of canopy shading and snow coverage on effective albedo in a snow-dominated evergreen needleleaf forest. Remote Sensing of Environment, 214: 48-58. doi: 10.1016/j.rse.2018.05.023
Griessinger, N.; Mohr, F.; Jonas, T., 2018: Measuring snow ablation rates in alpine terrain with a mobile multioffset ground-penetrating radar system. Hydrological Processes, 32, 21: 3272-3282. doi: 10.1002/hyp.13259
Webster, C.; Westoby, M.; Rutter, N.; Jonas, T., 2018: Three-dimensional thermal characterization of forest canopies using UAV photogrammetry. Remote Sensing of Environment, 209: 835-847. doi: 10.1016/j.rse.2017.09.033
Todt, M.; Rutter, N.; Fletcher, C.G.; Wake, L.M.; Bartlett, P.A.; Jonas, T.; Kropp, H.; Loranty, M.M.; Webster, C., 2018: Simulation of longwave enhancement in boreal and montane forests. Journal of Geophysical Research D: Atmospheres, 123: 13731-13747. doi: 10.1029/2018JD028719
Webster, C.; Rutter, N.; Jonas, T., 2017: Improving representation of canopy temperatures for modeling subcanopy incoming longwave radiation to the snow surface. Journal of Geophysical Research D: Atmospheres, 122, 17: 9154-9172. doi: 10.1002/2017JD026581
Marty, C.; Tilg, A.; Jonas, T., 2017: Recent evidence of large-scale receding snow water equivalents in the European Alps. Journal of Hydrometeorology, 18, 4: 1021-1031. doi: 10.1175/JHM-D-16-0188.1
Winstral, A.; Jonas, T.; Helbig, N., 2017: Statistical downscaling of gridded wind speed data using local topography. Journal of Hydrometeorology, 18: 335-348. doi: 10.1175/JHM-D-16-0054.1
Helbig, N.; Mott, R.; Van Herwijnen, A.; Winstral, A.; Jonas, T., 2017: Parameterizing surface wind speed over complex topography. Journal of Geophysical Research D: Atmospheres, 122, 2: 651-667. doi: 10.1002/2016JD025593
Magnusson, J.; Winstral, A.; Stordal, A.S.; Essery, R.; Jonas, T., 2017: Improving physically based snow simulations by assimilating snow depths using the particle filter. Water Resources Research, 53, 2: 1125-1143. doi: 10.1002/2016WR019092
Juras, R.; Würzer, S.; Pavlásek, J.; Vitvar, T.; Jonas, T., 2017: Rainwater propagation through snowpack during rain-on-snow sprinkling experiments under different snow conditions. Hydrology and Earth System Sciences, 21, 9: 4973-4987. doi: 10.5194/hess-21-4973-2017
Würzer, S.; Wever, N.; Juras, R.; Lehning, M.; Jonas, T., 2017: Modelling liquid water transport in snow under rain-on-snow conditions – considering preferential flow. Hydrology and Earth System Sciences, 21, 3: 1741-1756. doi: 10.5194/hess-21-1741-2017
Moeser, D.; Mazzotti, G.; Helbig, N.; Jonas, T., 2016: Representing spatial variability of forest snow: implementation of a new interception model. Water Resources Research, 52, 2: 1208-1226. doi: 10.1002/2015WR017961
Würzer, S.; Jonas, T.; Wever, N.; Lehning, M., 2016: Influence of initial snowpack properties on runoff formation during rain-on-snow events. Journal of Hydrometeorology, 17, 6: 1801-1815. doi: 10.1175/JHM-D-15-0181.1
Webster, C.; Rutter, N.; Zahner, F.; Jonas, T., 2016: Modeling subcanopy incoming longwave radiation to seasonal snow using air and tree trunk temperatures. Journal of Geophysical Research D: Atmospheres, 121, 3: 1220-1235. doi: 10.1002/2015JD024099
Webster, C.; Rutter, N.; Zahner, F.; Jonas, T., 2016: Measurement of incoming radiation below forest canopies: a comparison of different radiometer configurations. Journal of Hydrometeorology, 17, 3: 853-864. doi: 10.1175/JHM-D-15-0125.1
Revuelto, J.; Jonas, T.; López-Moreno, J., 2016: Backward snow depth reconstruction at high spatial resolution based on time-lapse photography. Hydrological Processes, 30, 17: 2976-2990. doi: 10.1002/hyp.10823
Furrer, R.; Schaub, M.; Bossert, A.; Isler, R.; Jenny, H.; Jonas, T.; Marti, C.; Jenni, L., 2016: Variable decline of Alpine Rock Ptarmigan (Logopus muta helvetica) in Switzerland between regions and sites. Journal für Ornithologie, 157, 3: 787-796. doi: 10.1007/s10336-016-1324-8
Griessinger, N.; Seibert, J.; Magnusson, J.; Jonas, T., 2016: Assessing the benefit of snow data assimilation for runoff modeling in Alpine catchments. Hydrology and Earth System Sciences, 20, 9: 3895-3905. doi: 10.5194/hess-20-3895-2016
Jenicek, M.; Seibert, J.; Zappa, M.; Staudinger, M.; Jonas, T., 2016: Importance of maximum snow accumulation for summer low flows in humid catchments. Hydrology and Earth System Sciences, 20, 2: 859-874. doi: 10.5194/hess-20-859-2016
Moeser, D.; Morsdorf, F.; Jonas, T., 2015: Novel forest structure metrics from airborne LiDAR data for improved snow interception estimation. Agricultural and Forest Meteorology, 208: 40-49. doi: 10.1016/j.agrformet.2015.04.013
Kobierska, F.; Jonas, T.; Griessinger, N.; Hauck, C.; Huxol, S.; Bernasconi, S.M., 2015: A multi-method field experiment to determine local groundwater flow in a glacier forefield. Hydrological Processes, 29, 6: 817-827. doi: 10.1002/hyp.10188
Magnusson, J.; Wever, N.; Essery, R.; Helbig, N.; Winstral, A.; Jonas, T., 2015: Evaluating snow models with varying process representations for hydrological applications. Water Resources Research, 51, 4: 2707-2723. doi: 10.1002/2014WR016498
Kobierska, F.; Jonas, T.; Kirchner, J.W.; Bernasconi, S.M., 2015: Linking baseflow separation and groundwater storage dynamics in an alpine basin (Dammagletscher, Switzerland). Hydrology and Earth System Sciences, 19, 8: 3681-3693. doi: 10.5194/hess-19-3681-2015
Helbig, N.; Van Herwijnen, A.; Magnusson, J.; Jonas, T., 2015: Fractional snow-covered area parameterization over complex topography. Hydrology and Earth System Sciences, 19, 3: 1339-1351. doi: 10.5194/hess-19-1339-2015
Helbig, N.; Van Herwijnen, A.; Jonas, T., 2015: Forecasting wet-snow avalanche probability in mountainous terrain. Cold Regions Science and Technology, 120: 219-226. doi: 10.1016/j.coldregions.2015.07.001
Gouttevin, I.; Lehning, M.; Jonas, T.; Gustafsson, D.; Mölder, M., 2015: A two-layer canopy model with thermal inertia for an improved snowpack energy balance below needleleaf forest (model SNOWPACK, version 3.2.1, revision 741). Geoscientific Model Development, 8, 8: 2379-2398. doi: 10.5194/gmd-8-2379-2015
Moeser, D.; Stähli, M.; Jonas, T., 2015: Improved snow interception modeling using canopy parameters derived from airborne LiDAR data. Water Resources Research, 51, 7: 5041-5059. doi: 10.1002/2014WR016724
Bühler, Y.; Marty, M.; Egli, L.; Veitinger, J.; Jonas, T.; Thee, P.; Ginzler, C., 2015: Snow depth mapping in high-alpine catchments using digital photogrammetry. Cryosphere, 9, 1: 229-243. doi: 10.5194/tc-9-229-2015
Wever, N.; Jonas, T.; Fierz, C.; Lehning, M., 2014: Model simulations of the modulating effect of the snow cover in a rain-on-snow event. Hydrology and Earth System Sciences, 18, 11: 4657-4669. doi: 10.5194/hess-18-4657-2014
Moeser, D.; Roubinek, J.; Schleppi, P.; Morsdorf, F.; Jonas, T., 2014: Canopy closure, LAI and radiation transfer from airborne LiDAR synthetic images. Agricultural and Forest Meteorology, 197: 158-168. doi: 10.1016/j.agrformet.2014.06.008
Magnusson, J.; Kobierska, F.; Huxol, S.; Hayashi, M.; Jonas, T.; Kirchner, J.W., 2014: Melt water driven stream and groundwater stage fluctuations on a glacier forefield (Dammagletscher, Switzerland). Hydrological Processes, 28, 3: 823-836. doi: 10.1002/hyp.9633
Magnusson, J.; Gustafsson, D.; Hüsler, F.; Jonas, T., 2014: Assimilation of point SWE data into a distributed snow cover model comparing two contrasting methods. Water Resources Research, 50, 10: 7816-7835. doi: 10.1002/2014WR015302
Jörg-Hess, S.; Fundel, F.; Jonas, T.; Zappa, M., 2014: Homogenisation of a gridded snow water equivalent climatology for Alpine terrain: methodology and applications. Cryosphere, 8, 2: 471-485. doi: 10.5194/tc-8-471-2014
Hüsler, F.; Jonas, T.; Riffler, M.; Musial, J.P.; Wunderle, S., 2014: A satellite-based snow cover climatology (1985–2011) for the European Alps derived from AVHRR data. Cryosphere, 8, 1: 73-90. doi: 10.5194/tc-8-73-2014
Bavera, D.; Bavay, M.; Jonas, T.; Lehning, M.; De Michele, C., 2014: A comparison between two statistical and a physically-based model in snow water equivalent mapping. Advances in Water Resources, 63: 167-178. doi: 10.1016/j.advwatres.2013.11.011
Steger, C.; Kotlarski, S.; Jonas, T.; Schär, C., 2013: Alpine snow cover in a changing climate: a regional climate model perspective. Climate Dynamics, 41, 3-4: 735-754. doi: 10.1007/s00382-012-1545-3
Kobierska, F.; Jonas, T.; Zappa, M.; Bavay, M.; Magnusson, J.; Bernasconi, S.M., 2013: Future runoff from a partly glacierized watershed in Central Switzerland: a two-model approach. Advances in Water Resources, 55: 204-214. doi: 10.1016/j.advwatres.2012.07.024
López-Moreno, J.I.; Fassnacht, S.R.; Heath, J.T.; Musselman, K.N.; Revuelto, J.; Latron, J.; Morán-Tejeda, E.; Jonas, T., 2013: Small scale spatial variability of snow density and depth over complex alpine terrain: implications for estimating snow water equivalent. Advances in Water Resources, 55: 40-52. doi: 10.1016/j.advwatres.2012.08.010
Magnusson, J.; Jonas, T.; Kirchner, J.W., 2012: Temperature dynamics of a proglacial stream: identifying dominant energy balance components and inferring spatially integrated hydraulic geometry. Water Resources Research, 48, 6: W06510 (16 pp.). doi: 10.1029/2011WR011378
Hüsler, F.; Jonas, T.; Wunderle, S.; Albrecht, S., 2012: Validation of a modified snow cover retrieval algorithm from historical 1-km AVHRR data over the European Alps. Remote Sensing of Environment, 121: 497-515. doi: 10.1016/j.rse.2012.02.018
Egli, L.; Jonas, T.; Grünewald, T.; Schirmer, M.; Burlando, P., 2012: Dynamics of snow ablation in a small Alpine catchment observed by repeated terrestrial laser scans. Hydrological Processes, 26, 10: 1574-1585. doi: 10.1002/hyp.8244
Dutra, E.; Kotlarski, S.; Viterbo, P.; Balsamo, G.; Miranda, P.M.A.; Schär, C.; Bissolli, P.; Jonas, T., 2011: Snow cover sensitivity to horizontal resolution, parameterizations, and atmospheric forcing in a land surface model. Journal of Geophysical Research D: Atmospheres, 116: D21109 (16 pp.). doi: 10.1029/2011JD016061
Magnusson, J.; Farinotti, D.; Jonas, T.; Bavay, M., 2011: Quantitative evaluation of different hydrological modelling approaches in a partly glacierized Swiss watershed. Hydrological Processes, 25, 13: 2071-2084. doi: 10.1002/hyp.7958
Egli, L.; Griessinger, N.; Jonas, T., 2011: Seasonal development of spatial snow-depth variability across different scales in the Swiss Alps. Annals of Glaciology, 52, 58: 216-222. doi: 10.3189/172756411797252211
Bernasconi, S.M.; Bauder, A.; Bourdon, B.; Brunner, I.; Bünemann, E.; Christl, I.; Derungs, N.; Edwards, P.; Farinotti, D.; Frey, B.; Frossard, E.; Furrer, G.; Gierga, M.; Göransson, H.; Gülland, K.; Hagedorn, F.; Hajdas, I.; Hindshaw, R.; Ivy-Ochs, S.; ... Zumsteg, A., 2011: Chemical and biological gradients along the Damma Glacier soil chronosequence, Switzerland. Vadose Zone Journal, 10, 3: 867-883. doi: 10.2136/vzj2010.0129
Kobierska, F.; Jonas, T.; Magnusson, J.; Zappa, M.; Bavay, M.; Bosshard, T.; Paul, F.; Bernasconi, S.M., 2011: Climate change effects on snow melt and discharge of a partly glacierized watershed in Central Switzerland (SoilTrec Critical Zone Observatory). Applied Geochemistry, 26: S60-S62. doi: 10.1016/j.apgeochem.2011.03.029
Egli, L.; Jonas, T.; Bettems, J., 2010: A virtual network for estimating daily new snow water equivalent and snow depth in the Swiss Alps. Annals of Glaciology, 51, 54: 32-38. doi: 10.3189/172756410791386427
Sturm, M.; Taras, B.; Liston, G.E.; Derksen, C.; Jonas, T.; Lea, J., 2010: Estimating snow water equivalent using snow depth data and climate classes. Journal of Hydrometeorology, 11, 6: 1380-1394. doi: 10.1175/2010jhm1202.1
Magnusson, J.; Jonas, T.; Lopéz-Moreno, I.; Lehning, M., 2010: Snow cover response to climate change in a high alpine and half-glacierized basin in Switzerland. Hydrology Research, 41, 3-4: 230-240. doi: 10.2166/nh.2010.115
Rammig, A.; Jonas, T.; Zimmermann, N.E.; Rixen, C., 2010: Changes in alpine plant growth under future climate conditions. Biogeosciences, 7, 6: 2013-2024. doi: 10.5194/bg-7-2013-2010
Rutter, N.; Essery, R.; Pomeroy, J.; Altimir, N.; Andreadis, K.; Baker, I.; Barr, A.; Bartlett, P.; Boone, A.; Deng, H.; Jonas, T.; Stähli, M.; Yamazaki, T., 2009: Evaluation of forest snow processes models (SnowMIP2). Journal of Geophysical Research D: Atmospheres, 114: D06111 (18 pp.). doi: 10.1029/2008JD011063
Salzmann, N.; Huggel, C.; Calanca, P.; Diaz, A.; Jonas, T.; Jurt, C.; Konzelmann, T.; Lagos, P.; Rohrer, M.; Silverio, W.; Zappa, M., 2009: Integrated assessment and adaptation to climate change impacts in the Peruvian Andes. Advances in Geosciences, 22: 35-39. doi: 10.5194/adgeo-22-35-2009
Stähli, M.; Jonas, T.; Gustafsson, D., 2009: The role of snow interception in winter-time radiation processes of a coniferous sub-alpine forest. Hydrological Processes, 23, 17: 2498-2512. doi: 10.1002/hyp.7180
Jonas, T.; Marty, C.; Magnusson, J., 2009: Estimating the snow water equivalent from snow depth measurements in the Swiss Alps. Journal of Hydrology, 378: 161-167. doi: 10.1016/j.jhydrol.2009.09.021
Egli, L.; Jonas, T.; Meister, R., 2009: Comparison of different automatic methods for estimating snow water equivalent. Cold Regions Science and Technology, 57: 107-115. doi: 10.1016/j.coldregions.2009.02.008
Bavay, M.; Lehning, M.; Jonas, T.; Löwe, H., 2009: Simulations of future snow cover and discharge in Alpine headwater catchments. Hydrological Processes, 23, 1: 94-108. doi: 10.1002/hyp.7195
Egli, L.; Jonas, T., 2009: Hysteretic dynamics of seasonal snow depth distribution in the Swiss Alps. Geophysical Research Letters, 36: L02501 (5 pp.). doi: 10.1029/2008GL035545
Jonas, T.; Rixen, C.; Sturm, M.; Stöckli, V., 2008: How alpine plant growth is linked to snow cover and climate variability. Journal of Geophysical Research G: Biogeosciences, 113, G03013: 10 pp.. doi: 10.1029/2007JG000680
Jonas, T.; Geiger, F.; Jenny, H., 2008: Mortality pattern of the Alpine chamois: the influence of snow-meteorological factors. Annals of Glaciology, 56-62. doi: 10.3189/172756408787814735
Lundström, T.; Jonas, T.; Volkwein, A., 2008: Analysing the mechanical performance and growth adaptation of Norway spruce using a non-linear finite-element model and experimental data. Journal of Experimental Botany, 59, 9: 2513-2528. doi: 10.1093/jxb/ern116
Fontana, F.; Rixen, C.; Jonas, T.; Aberegg, G.; Wunderle, S., 2008: Alpine grassland phenology as seen in AVHRR, VEGETATION, and MODIS NDVI time series - a comparison with in situ measurements. Sensors, 8, 4: 2833-2853. doi: 10.3390/s8042833
Bernasconi, S.M.; Christl, I.; Hajdas, I.; Zimmermann, S.; Hagedorn, F.; Smittenberg, R.H.; Furrer, G.; Zeyer, J.; Brunner, I.; Frey, B.; Plötze, M.; Lapanje, A.; Edwards, P.; Olde Venterink, H.; Göransson, H.; Frossard, E.; Bünemann, E.; Jansa, J.; Tamburini, F.; ... Abbaspour, K., 2008: Weathering, soil formation and initial ecosystem evolution on a glacier forefield: a case study from the Damma Glacier, Switzerland. Mineralogical Magazine, 72, 1: 19-22. doi: 10.1180/minmag.2008.072.1.19
Lundström, T.; Jonas, T.; Stöckli, V.; Ammann, W., 2007: Anchorage of mature conifers: resistive turning moment, root-soil plate geometry and root growth orientation. Tree Physiology, 27: 1217-1227. doi: 10.1093/treephys/27.9.1217
Further scientific publications
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.
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.; 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.
Small, D.; Miranda, N.; Ewen, T.; Jonas, T., 2013: Reliably flattened radar backscatter for wet snow mapping from wide-swath sensors. In: 2013: ESA living planet symposium, Edinburgh, Scotland. (8 pp.).
WSL-Institut für Schnee- und Lawinenforschung SLF (Ed.); Feistl, T.; Fierz, C.; Huovinen, C.; Jonas, T.; Löwe, H.; Margreth, S.; Marty, C.; Phillips, M.; Rhyner, H.; Rixen, C.; Schweizer, J.; Stähli, M.; Stucki, T., 2013: Schnee. 160 p.
Steinkogler, W.; Sovilla, B.; Jonas, T.; Lehning, M., 2013: Thermal energy in snow avalanches. In: Naaim-Bouvet, F.; Durand, Y.; Lambert, R. (eds), 2013: International snow science workshop proceedings 2013. International snow science workshop, ISSW 2013, Grenoble - Chamonix Mont-Blanc, France, October 7-11, 2013. 583-586.
Rhyner, H.; Jonas, T.; Rixen, C.; Marty, C., 2013: Schnee als Ressource. In: WSL-Institut für Schnee- und Lawinenforschung SLF (eds), 2013: Schnee. Darmstadt, Primus. 88-109.
Schweizer, J.; Margreth, S.; Feistl, T.; Stucki, T.; Jonas, T., 2013: Schnee als Bedrohung. In: WSL-Institut für Schnee- und Lawinenforschung SLF (eds), 2013: Schnee. Darmstadt, Primus. 56-87.
Fierz, C.; Jonas, T.; Stähli, M., 2013: Die Schneedecke. In: WSL-Institut für Schnee- und Lawinenforschung SLF (eds), 2013: Schnee. Darmstadt, Primus. 38-55.
Jonas, T., 2012: Monitoring von Schneewasserressourcen in der Schweiz. In: 2012: Alpine Schnee- und Wasserressourcen gestern, heute, morgen. Forum für Wissen 2012, WSL Birmensdorf. 7-12.
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. In: 2011: Auswirkungen der Klimaänderung auf die Wasserkraftnutzung - Synthesebericht. 28 pp..
Jonas, T.; Essery, R., 2011: Snow cover and snowmelt in forest regions. In: Singh, V.P.; Singh, P.; Haritashya, U.K. (eds), 2011: Encyclopedia of Snow, Ice and Glaciers. Dordrecht, Springer. 1033-1036.
Magnusson, J.; Jonas, T.; Lopez-Moreno, I.; Lehning, M., 2008: Potential impact of climate change on the snowpack in a partly-glaciated basin in central Switzerland. In: Sveinsson, O.G.B.; Gardarsson, S.M.; Gunnlaugsdottir, S. (eds), 2008: orthern Hydrology and its global role. Proceedings vol. 1. XXV Nordic Hydrological Conference, Reykjavik. 67-81.
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.
Huggel, C.; Salzmann, N.; Angulo, L.; Calanca, P.; Diaz, A.; Encinas, C.; Jonas, T.; Juarez, 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. Mountain Research Initiative Newsletter, 11-14.
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)".
- 1991: High school exam (German Abitur), Helene-Lange Gymnasium, Rendsburg.
Scientific Community
- President of the International Commission for Snow and Ice Hydrology (ICSIH / IAHS / IUGG)
- Member of the Swiss Hydrological Commission (CHy) of the Swiss Academy of Sciences (SCNAT)
- Member of several scientific societies such as International Glaciological Society (IGS) and American Geophysical Union (AGU)
- Serving as lead convener in scientific conferences
Supervised PhD Students
Current Dissertations
Johanna Malle (2017 - 2020)
- Preliminary title of PhD thesis: Improving the representation of forest albedo in land-surface models
- University: Northumbria University
- Supervisor at SLF: Dr. Tobias Jonas
- Supervisor in Northumbria: Dr. Nick Rutter
Giulia Mazzotti (2017 - 2020)
- Preliminary Title of PhD thesis: Improving the representation of forest snow processes in land surface models
- University: Swiss Federal Institute of Technology Zurich (ETHZ)
- Supervisor: Dr. Tobias Jonas
- Examiner: Prof. Dr. Martin Funk
Nena Griessinger (2015 - 2018)
- Preliminary Title of PhD thesis: Spatial and temporal variability of snowmelt
- University: Universität Zürich (UZH)
- Supervisor: Dr. Tobias Jonas
- Examiner: Prof. Dr. Jan Seibert
Sebastian Würzer (2013 - 2017)
- Title of PhD thesis: Snowpack runoff formation processes during rain-on-snow events
- University: Ecole polytechnique fédérale de Lausanne (EPFL)
- Supervisor: Dr. Tobias Jonas
- Examiner: Prof. Dr. Michael Lehning
- Co-Examiner: Prof. Dan Moore, Prof. Juraj Parajka, Prof. Alexis Berne
Completed Dissertations
Clare Webster (2013 - 2017)
- Title of PhD thesis: Measurement and modelling of sub-canopy radiation to seasonal snow in alpine forests
- University: Northumbria University
- Supervisor at SLF: Dr. Tobias Jonas
- Supervisor in Northumbria: Dr. Nick Rutter
David C Moeser (2012 - 2016)
- Title of PhD thesis: The influence of forest canopy structure on snow hydrology
- University: Swiss Federal Institute of Technology Zurich (ETHZ)
- Supervisor: Dr. Tobias Jonas
- Examiner: Prof. Dr. Harald Bugmann
- Co-Examiner: Prof. Dr. Jan Seibert, Dr. Felix Morsdorf
Florian Kobierska (2010 - 2014)
- Title of PhD thesis: Hydrology of a glacierized catchment across temporal and spatial scales
- University: Swiss Federal Institute of Technology Zurich (ETHZ)
- Supervisor: Dr. Tobias Jonas
- Examiner: Prof. Dr. Stefano Bernasconi
- Co-Examiner: Prof. Dr. James Kirchner, Prof. Dr. Mario Schirmer
Jan Magnusson (2007 - 2011)
- Title of PhD thesis: Hydrological conditions on the forefield of a retreating glacier
- University: Swiss Federal Institute of Technology Zurich (ETHZ)
- Supervisor: Dr. Tobias Jonas
- Examiner: Prof. Dr. James Kirchner
- Co-Examiner: Prof. Dr. Jan Seibert
Luca Egli (2007 - 2011)
- Title of PhD thesis: Dynamic of Snow Cover’s Spatial Distribution over Alpine Topography
- University: Swiss Federal Institute of Technology Zurich (ETHZ)
- Supervisor: Dr. Tobias Jonas
- Examiner: Prof. Dr. Paolo Burlando
- Co-Examiner: Prof. Dr. John W. Pomeroy