Ph.D. in geophysics, University of
Copenhagen, Denmark, 2000-2004
(IFREMER, France, Autumn 2001). PhD thesis: Remote
sensing of the sea ice around Greenland using multiple microwave sensors, 2003.
Supervisor: C. C. Tscherning, co-supervisors: L. Toudal Pedersen and R. S. Gill.
Area of Research:
Sea ice microwave emission and scattering: 1) theoretical understanding
and modelling of sea ice microwave emission and scattering processes,
2) understanding and modelling of sea ice metamorphosis, growth and
decay and its impact on microwave signatures, and 3) using satellite
microwave data for sea ice type, concentration and morphology
Several recent projects have focussed on the modelling of sea ice microwave
signatures and the estimation of uncertainties in remote sensing measurements:
Simulation of the sea ice thickness uncertainty using radar altimeters such as
CryoSat in the EU projects GreenIce and Damocles. In addition to
the well known uncertainties due to radar penetration and floe buoyancy the uncertainty
due to preferential sampling was described and quantified. Preferential sampling
is a bias in the surface height measurement due to the non-linear range of backscatter
coefficients originating from different ice thickness categories i.e. ridges, refrozen
melt-ponds and hummocks within the radar footprint. These simulations are described
in Tonboe et al. (2006a, 2006b, 2010).
Development of both a high resolution thermodynamic model and an emission model for
snow and sea ice in the EU projects GreenICE, IOMASA, and Damocles.
The output from the thermodynamic model was used as input to the emission model.
These simulations gave realistic radiometric signatures for sea ice and provide
both microphysical snow and sea ice parameters and microwave brightness temperatures
and emissivity. These simulations are described in Tonboe (2010), Tonboe et al. (2011),
and Heygster et al. (2012).
The simulation results were used for developing an operational
near 50 GHz sea ice emissivity model to be used for atmospheric sounding applications over
sea ice. The model is implemented operationally in the EUMETSAT Ocean and Sea Ice SAF and
described in Tonboe et al. (2013).
Simulation of the L-band brightness temperatures,
effective temperatures and emissivity from new-ice, first-year ice and multiyear ice as
a function of physical
sea ice parameters such as temperature, salinity, thickness, snow cover etc. in the ESA SMOSICE 1+2 projects.
The emission model, a sea ice version of MEMLS, was forced by physical input from a high resolution
thermodynamic model. Using the simulations it was possible to constrain the variables used in more
simple emission models to ease the inversion and to estimate uncertainties. The projects have demonstrated
that it is possible to derive the thickness of thin ice using L-band radiometry e.g. SMOS (Kaleschke et al., 2009).
Both the ongoing ESA climate change initiative on sea ice and the EUMETSAT Ocean and sea ice SAF projects
are working towards an improved sea ice concentration estimate using microwave radiometer data.
These data now including uncertainties. My role in these projects have been diverse from simulation
of test data to the implementation of operational algorithms.The work has among other
things resulted in the EUMETSAT sea ice climate record, a 30 year global sea ice climatology,
including temporally and spatially varying uncertainty estimates (Tonboe et al. in preparation).
Resent and ongoing projects:
Convection (2000-2003) - EU 5th FP project lead by Peter Wadhams
New-ice classification technique using satellite radiometer and
GreenIce (2002-2006) - EU 5th
FP project lead by Peter Wadhams (www.greenice.org).
Sea ice emission modelling using a sea ice verion of MEMLS
(continued from IOMASA).
Coupled thermodynamic and emission modelling to simulate the
Initiation and definition of the snow and ice measurement
programme on Tara's transarctic drift 2006-2008. pdf-report
OSI SAF - EUMETSAT project, ongoing
Sea ice emissivity, temperature and concentration
Andersen, S., L. Toudal Pedersen, G. Heygster, R. Tonboe, L. Kaleschke, Intercomparison
of passive microwave sea ice concentration retrievals over the high concentration Arctic sea ice.
Journal of Geophysical Research 112, C08004, doi10.1029/2006JC003543, 2007.
Andersen, S., R. T. Tonboe and L. Kaleschke. Satellite thermal microwave sea ice concentration
algorithm comparison. Arctic Sea Ice Thickness: Past, Present and Future, edited by Wadhams and Amanatidis.
Climate Change and Natural Hazards Series 10, EUR 22416, 2006.
Andersen, S., R. Tonboe, S. Kern, H. Schyberg. Improved retrieval of sea ice total concentration
from spaceborne passive microwave observations using Numerical Weather Prediction model fields:
An intercomparison of nine algorithms. Remote Sensing of Environment 104, 374-392, 2006.
Breivik, L.A., S. Eastwood, O. Godoy, H. Schyberg, S. Andersen and R. Tonboe. Sea ice products for the
EUMETSAT satellite application facility. Can. J. Rem. Sens. 27(5), 403-410, 2001.
Gill, R. S. and R. T. Tonboe. Classification of GreenICE SAR data using Fuzzy Screening Method.
Arctic Sea Ice Thickness: Past, Present and Future, edited by Wadhams and Amanatidis. Climate Change
and Natural Hazards Series 10, EUR 22416, 2006.
Dybkjar, G., Hoyer, J., Tonboe, R., 2012. Arctic surface temperatures from Metop AVHRR compared to
in situ ocean and land data. Ocean Sci., 9, doi:10.5194/osd-9-1009-2012.
Haarpaintner, J., R. T. Tonboe, D. G. Long, and M. L. VanWoert. Improvement and validity of the enhanced
resolution SeaWinds/ QuikScat sea ice edge. IEEE Trans. Geosci. Rem. Sens. 42(7), 1433-1443, 2004.
Heygster, G., C. Melsheimer, N. Mathew, L. Toudal, R. Saldo, S. Andersen, R. Tonboe, H. Schyberg, F. Thomas
Tveter, V. Thyness, N. Gustafsson, T. Landelius, and P. Dahlgren: POLAR PROGRAM: Integrated Observation and
Modeling of the arctic Sea Ice and Atmosphere. Bull. Amer. Meteor. Soc., 90, 293-297, 2009.
Heygster, G., V. Alexandrov, G. Dybkjar, F. Girard-Ardhuin, W. von Hoyningen-Huene, I.L. Katsev, A. Kokhanovsky,
T. Lavergne, A.V. Malinka, C. Melsheimer, L. Toudal Pedersen, A.S. Prikhach, R. Saldo, R. Tonboe, H. Wiebe, E P. Zege.
Remote sensing of sea ice: advances during the DAMOCLES project. The Cryosphere, 6, 1411-1434, 2012
Hoyer, J. L., I. Karagali, G. Dybkjar, R. Tonboe, Multi sensor validation and error characteristics of Arctic
satellite sea surface temperature observations, Remote Sensing of Environment 121, 335-346, 2012.
Horstmann, J. W. Koch, S. Lehner, and R. Tonboe, Wind retrieval over the ocean using synthetic aperture
radar with C-band HH polarization, IEEE Trans. Geosci. Rem. Sens. 38(5), 100-107, 2000.
Horstmann, J., S. Lehner, W. Koch, and R. Tonboe, Computation of wind vectors over the ocean using spaceborne
synthetic aperture radar, John Hopkins APL Technical Digest 21(1), 100-107, 2000.
Horstmann, J., W. Koch, S. Lehner, and R. Tonboe, Ocean winds from RADARSAT-1 ScanSAR, Can. J. Rem. Sens. 28(3), 534-533, 2002.
Kaleschke, L., N. MaaÃŸ, C. Haas, S. Hendricks, G. Heygster, and R. T. Tonboe. A sea ice thickness retrieval model
for 1.4 GHz radiometry and application to airborne measurements over low salinity sea ice. The Cryosphere 4, 583-592, 2010.
Narvekar, P. S., G. Heygster, R. Tonboe, T. J. Jackson. Analysis of WindSat third and fourth Stokes components
over Arctic sea ice. IEEE Transactions on Geoscience and Remote Sensing 49(5), 1627-1636, 2011.
Tonboe, R. T., S. Andersen, and L. Toudal. Simulation of the Ku-band radar altimeter sea ice signal.
IEEE Geosci. Rem. Sens. Let. 3(2), 237-240, 2006a.
Tonboe, R. T. and L. Toudal. Classification of new-ice in the Greenland Sea using satellite SSM/I radiometer and
SeaWinds data and comparison with ice model. Rem. Sens. Env. 97, 277-287, 2005.
Tonboe, R. T. The simulated sea ice thermal microwave emission at window and sounding frequencies. Tellus 62A, 333-344, 2010.
Tonboe, R. T., G. Dybkjar, J. L. HÃ¸yer. Simulations of the snow covered sea ice surface temperature and microwave effective
temperature. Tellus 63A, 1028-1037, 2011.
Tonboe, R. T., L. T. Pedersen, and C. Haas. Simulation of the Cryosat-2 satellite radar altimeter sea ice thickness
retrieval uncertainty. Canadian Journal of Remote Sensing 36(1), 55-67, 2010.
Tonboe, R. T., S. Andersen, R. S. Gill and L. Toudal Pedersen. The simulated seasonal variability of the Ku-band radar
altimeter effective scattering surface depth in sea ice. Arctic Sea Ice Thickness: Past, Present and Future, edited by
Wadhams and Amanatidis. Climate Change and Natural Hazards Series 10, EUR 22416, 2006b.
Tonboe, R., S. Andersen, L. Toudal and G. Heygster. Sea ice emission modelling. In: MÃ¤tzler, C., P.W. Rosenkranz, A. Battaglia
and J.P. Wigneron (eds.), "Thermal Microwave Radiation - Applications for Remote Sensing", IET Electromagnetic Waves
Series 52, London, UK, 2006.
Tonboe, R. T., H. Schyberg, E. Nielsen, K. R. Larsen, F. T. Tveter. The EUMETSAT OSI SAF near 50 GHz sea ice emissivity model.
Tellus A, 2013, 65, 18380, http://dx.doi.org/10.3402/tellusa.v65i0.18380
Tonboe, R. T., S. Eastwood, T. Lavergne, E. Nielsen, K. R. Larsen, G. Dybkjar, L. Toudal, J. L. Hoyer. The EUMETSAT sea ice
climate record. In preparation 2013.
Popular in danish, selected:
Tonboe, R. T., L. Toudal, S. Andersen, R. S. Gill. CryoSat -
baste forventninger. Geologisk Nyt 5, 20-23, 2005. pdf
Tonboe, R. T., S. Andersen, T. Schmith. DAMOCLES -
bidrag til IPY. Geologisk Nyt 3, 14-16, 2006. pdf
Andersen, H. S. and R. T. Tonboe (1999). Monitoring Agriculture
with Remote Sensing (MARS) Investigation of the MARS project for
potential DMI involvement. DMI tech. rep. Det Offentlige
Forskningsudvalg for Rummet J. nr. 1106-OFRbevilling/19-20/98.
Heygster, G., C. Melsheimer, N. Mathew, L. Toudal, R. Saldo, S.
Andersen, R. Tonboe, H. Schyberg, F. Tveter, V. Thyness, N. Gustafsson,
T. Landelius, P. Dahlgren, & V. Perov. IOMASA - Integrated
Observation and modelling of the Arctic Sea Ice and Atmosphere. Final
report for EU project EVK-CT-2002-0067, University of Bremen, Institute
of Environmental Physics, 2005.
Sandven, S., M. Makynen, M. Mallikinen, A. Cavanie, R. Ezraty, R.
S. Gill, H. H. Valeur, L. Toudal Pedersen, V. Alexandrov, A. Bogdanov,
R. T. Tonboe, M. Lundhaug, Ø. Dalen and K. Kloster (1999). IMSI
Final Report. EU Contract No. ENV4-CT96-0361.
Tonboe, R. & J. Haarpaintner (2003). Implementation of
QuikScat SeaWinds data in the EUMETSAT Ocean & Sea Ice ice product.
DMI Technical Report No. 03-13, p. 34.
Tonboe, R. & S. Hanson. Microphysical measurements important
for microwave remote sensing of sea ice, field guide. DMI Scientific
Report 06-03, 2006.
Tonboe, R. A mass and thermodynamic model for sea ice. DMI
Scientific Report 05-10, 2005
Tonboe, R. T. & S. Andersen, Modelled radiometer algorithm
ice concentration sensitivity to emissivity variations of the Arctic
sea ice snow cover, DMI Scientific Report 04-03, 2004.
Tonboe, R. T. and Rosengreen, M. K. (1998). Operational test of
RADARSAT and data dissemination. IMSI report no. 10. EU Contract No.
Tonboe, R. T. Detailed wind speed information from Radarsat
ScanSAR Wide. DMI tech. rep. 01-04, 2001.
Tonboe, R. T. Radar mapping of Råbjerg Mile. M.Sc. thesis.
Geological Institute, University of Aarhus 1997.
Tonboe, R. T. Remote sensing of the sea ice around Greenland
using multiple microwave satellite sensors. Ph.D. thesis, Department of
Geophysics, Niels Bohr nstitute, University of Copenhagen 2004.
Tonboe, R. T. Simulation of the seasonal sea ice microwave
emissivity variability - a demonstration of model functionality. DMI
scientific report 06-05, p. 16, 2006. (pdf)
Tonboe, R. T., M. K. Rosengreen, P. M. Eriksen, K. Q. Hansen, R.
S. Gill. Evaluation of the operational Radarsat ice mapping in the Cape
Farewell waters during summer 1999. DMI tech. rep. 01-03, 2001.
Tonboe, R., S. Andersen, & L. Toudal (2003). Anomalous winter
sea ice backscatter and brightness temperatures. DMI scientific report
No. 03-13, p. 59.
Ezraty, R., R. Tonboe, & R. S. Gill (2002). Monitoring the
2001 Odden with SeaWinds. Proceedings of the 7th Circumpolar symposium
on remote sensing of polar environments, Longyearbyen, Svalbard, Norway.
Gill, R. S., Rosengreen M.K., Andersen H. S., Tonboe R. T. and
Valeur H. H. (1998). Sea ice mapping around Greenland using Radarsat,
Proceedings the 7th POLARTECH'98, Nuuk, Greenland.
Haapaintner, J., R. T. Tonboe, D. G. Long, M. L. VanWoert, &
K. R. Dedrick (2003). Refinement of the SeaWinds/ QuikScat sea ice
edge. Proceedings ACSYS conference 2003, Sct. Petersbourg, Russia.
Horstmann, J., W. Koch, I. Weinreich, S. Lehner, R. Tonboe
(1999). Computation of Ocean Wind Vectors Using RADARSAT ScanSAR and
ERS SAR Images. Proceedings IGARSS '99, Hamburg.
Horstmann, J., W. Koch, S. Lehner, E. Romaneessen, & R.
Tonboe (2000). Extraction of Ocean Wind Fields Using RADARSAT-1 ScanSAR
Images, in Proceedings of the Sixth International Conference on Remote
Sensing for Marine and Coastal Environments, Charleston, South Carolina.
Tonboe, R. & J. Haarpaintner (2003). Implementation of
QuikScat SeaWinds data in the EUMETSAT O&SI SAF ice product.
Proceedings EUMETSAT 2003 meteorological satellite conference in
Tonboe, R. (2001). QuikScat - SeaWinds scatterometer observations
of sea ice types around Greenland. Proceedings SPIE conference,
Tonboe, R. T., R. S. Gill and J. Horstmann (1999). Near Ice Edge
Estimation of the Sea Surface Winds Using Radarsat ScanSAR. Proceedings
EUMETSAT Meteorological Satellite Data Users Conference, Copenhagen.
Tonboe, R. T., S. Andersen, R. S. Gill, L. Toudal Pedersen. Sea
ice microwave emission modelling applications. Proceedings EUMETSAT
2006 meteorological satellite conference in Helsinki, Finland.
Tonboe, R., & R. Ezraty. Monitoring of New Sea Ice in
Greenland Waters. IGARSS 2002, Proceedings IEEE, pp. 1932-1934, 2002.
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