Profile for Thorsten Markus


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Title: Lab Chief
Affiliation: NASA
Contact: E-mail
NASA-GSFC, Code 615
Greenbelt, MD 20771

Office Phone: 301-614-5882
Fax: 301-614-5644

Research Interests

Remote sensing of sea ice; polar ocean processes and their connection to global climate.

Short Biography

Thorsten Markus is the head of NASA Goddard's Cryospheric Sciences Lab and the Project Scientist for the ICESat-2 mission. His research focuses on the development of new approaches to derive cryospheric parameters from space-borne or air-borne observations.

Thorsten received his Ph.D. degree in Physics from the University of Bremen, Germany. He came to NASA Goddard SFC in 1996, first as an NRC post-doc, working on Antarctic coastal polynyas, and then via UMBC JCET where he still is an adjunct professor in the physics department. In 2002, he was hired as a civil servant and joined the Microwave Sensors Branch.

He is a member of the Aqua AMSR-E Science Team, where he is responsible for the sea ice concentration and snow on sea ice products, the ICESat Science Team, and the the JAXA GCOM-W AMSR2 Science Team. He has participated in and co-led ship-borne and air-borne validation campaigns in both hemispheres. His research activities led him three times to the Antarctic and three times to the Arctic. He furthermore is working on the use of satellite-derived geophysical parameters in data analysis efforts and in data assimilation schemes to explore the role of cryospheric processes in the polar and global climate system.

Current Projects

Publications

Brucker, L., D.J. Cavalieri, T. Markus, and A. Ivanoff (2014). NASA Team 2 Sea Ice Concentration Algorithm Retrieval Uncertainty IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING.
10.1109/TGRS.2014.2311376

Brunt, K., T. A. Neumann, K. M. Walsh, and T. Markus. (2014). Determination of Local Slope on the Greenland Ice Sheet Using a Multibeam Photon-Counting Lidar in Preparation for the ICESat-2 Mission IEEE Geoscience and Remoste Sensing Letters, 11(5).

Kwok, R., T. Markus, J. Morison, S. P. Palm, T. A. Neumann, K. M. Brunt, W. B. Cook, D. W. Hancock, and G. F. Cunningham. (2014). Profiling sea ice with a Multiple Altimeter Beam Experimental Lidar (MABEL) Journal of Atmospheric and Oceanic Technology, 31(5), 1151-1168
10.1175/JTECH-D-13-00120.1

Stroeve, J., T. Markus, L. Boisvert, J. Miller, and A. Barrett. (2014). Changes in Arctic melt season and implications for sea ice loss Geophys. Res. Lett., 41.
10.1002/2013GL058951

Boisvert, L., T. Markus, and Vihma T. (2013). Moisture flux changes and trends for the entire Arctic in 2003-2011 derived from EOS Aqua data Moisture Fluxes in the Arctic: 2003-2011 Journal of geophysical research. Oceans, 118(10), 5829 - 5843
10.1002/jgrc.20414

Boisvert, L., T. Markus, and T. Vihma. (2013). Moisture flux changes and trends for the entire Arctic in 2003-2011 derived from EOS Aqua Data J. Geophys. Res. Oceans, 118, 5829-5843
10.1002/jgrc.20414

Brucker, L., and T. Markus. (2013). Arctic-Scale Assessment of Satellite Passive Microwave Derived Snow Depth on Sea Ice using Operation IceBridge Airborne Data Journal of Geophysical Research, 118, 14
10.1002/jgrc.20228

McGill, Matthew, T. Markus, V. Stanley Scott, and T. Neumann (2013). The Multiple Altimeter Beam Experimental Lidar (MABEL), an airborne simulator for the ICESat-2 mission Journal of Atmospheric and Oceanic Technology , 30, 345–352
10.1175/JTECH-D-12-00076.1

Boisvert, L., T. Markus, C. L. Parkinson, and T. Vihma (2012). Moisture fluxes derived from EOS Aqua satellite data for the North Water polynya over 2003-2009 Journal of Geophysical Research, 117(D6).
10.1029/2011JD016949

Cavalieri, D., T. Markus, A. Ivanoff, J. A. Miller, L. Brucker, M. Sturm, J. A. Maslanik, J. F. Heinrichs, A. J. Gasiewski, C. Leuschen, W. Krabill, and J. Sonntag. (2012). A Comparison of Snow Depth on Sea Ice Retrievals Using Airborne Altimeters and an AMSR-E Simulator IEEE Transactions on Geoscience and Remote Sensing, 50(8).
10.1109/TGRS.2011.2180535

Farrell, S., N.T. Kurtz, L. Connor, B. Elder, C. Leuschen, T. Markus, D.C. McAdoo, B. Panzer, J. Richter-Menge, and J. Sonntag. (2012). A First Assessment of IceBridge Snow and Ice Thickness Data over Arctic Sea Ice IEEE Transactions on Geoscience and Remote Sensing, 50(6).
10.1109/TGRS.2011.2170843

Kurtz, N., and T. Markus. (2012). Satellite observations of Antarctic sea ice thickness and volume Journal of Geophysical Research, 117.
10.1029/2012JC008141

Farrell, S., T. Markus, R. Kwok, and L. Connor (2011). Laser Altimetry Sampling Strategies over Sea Ice Ann. Glaciol., 52(57), 69-76

Kurtz, N., T. Markus, S.L. Farrell, D.L. Worthen, and L.N. Boisvert (2011). Observations of recent Arctic sea ice volume loss and its impact on ocean-­‐ atmosphere energy exchange and ice production J. Geophys. Res, 116, C04015
10.1029/2010JC006235

Kwok, R., B. Panzer, C. Leuschen, S. Pang, T. Markus, B. Holt, and S. Gogineni (2011). Airborne surveys of snow depth over Arctic sea ice J. Geophys. Res, 116, C11018
10.1029/2011JC007371

Markus, T., R. Massom, T. Worby, V. Lytle, N. Kurtz, and T. Maksym. (2011). Freeboard, snow depth, and sea ice roughness in East Antarctica from in-situ and multiple satellite data Annals of Glaciology, 52(57).

Worby, A., Worby, A., A. Steer, A. Steer, J.L. Lieser, J.L. Lieser, P. Heil, P. Heil, D. Yi, D. Yi, T. Markus, T. Markus, I. Allison, I. Allison, R.A. Massom, R.A. Massom, N. Galin, N. Galin, H.J. Zwally., and H.J. Zwally. (2011). Regional-scale sea ice and snow thickness distributions from in situ and satellite measurements over East Antarctica during SIPEX 2007 Deep Sea Research, 58, 1125-1136

Abdalati, W., H.J. Zwally, R. Bindschadler, B. Csatho, S. Farrell, H. Fricker, D. Harding, R. Kwok, M. Lefsky, T. Markus, A. Marshak, T. Neumann, S. Palm, B. Schutz, B. Smith, J. Spinhirne, and C. Webb. (2010). The ICESat-2 Laser Altimetry Mission Proc. IEEE, 98(5), 735-751
10.1109/JPROC.2009.2034765

Cavalieri, D.J., T. Markus, D.K. Hall, A. Ivanoff, and Emily Glick (2010). Assessment of AMSR-E Antarctic Winter Sea-Ice Concentrations Using Aqua MODIS IEEE Transactions on Geoscience and Remote Sensing, 48(9).
3331- 3339

Tedesco, M., R. Reichle, A. Low, T. Markus, and J.L. Foster (2010). Dynamic approaches for snow depth retrieval from space-borne microwave brightness temperatures IEEE TGARS

Howell, S.E.L., C.R. Duguay, and T. Markus (2009). Sea ice conditions and melt season duration variability within the Canadian Arctic Archipelago: 1979–2008 Geophys. Res. Lett., 36(L10502).
10.1029/2009GL037681

Kurtz, N., T. Markus, D.J. Cavalieri, L.C. Sparling, W. Krabill, A.J. Gasiewski, and J.G. Sonntag. (2009). Retrieval of sea ice thickness distributions through the combination of large-scale snow depth and satellite laser altimetry measurements Journal of Geophysical Research, 114(C10007).

Kurtz, N.T., T. Markus, D.J. Cavalieri, L.C. Sparling, B. Krabill, A.J. Gasiewski, and J.G. Sonntag (2009). Estimation of sea ice thickness distributions through the combination of snow depth and satellite laser altimetry data J. Geophys. Res., 114, C10007
10.1029/2009JC005292

Markus, T., and D.J. Cavalieri (2009). The AMSR-E NT2 sea ice concentration algorithm: its basis and implementation Journal of The Remote Sensing Society of Japan, 29(1), 216-225

Markus, T., J.C. Stroeve, and J. Miller (2009). Recent changes in Arctic sea ice melt onset, freezeup, and melt season length J. Geophys. Res., 114, C12024
10.1029/2009JC005436

Wiebe, H., G. Heygster, and T. Markus (2009). Comparison of the ASI Ice Concentration Algorithm With Landsat-7 ETM+ and SAR Imagery IEEE Trans. Geosci. Remote Sens., 47(9), 3008-3015
10.1109/TGRS.2009.2026367

Kurtz, N.T., T. Markus, D.J. Cavalieri, B. Krabill, J.G. Sonntag, and J. Miller (2008). Comparison of ICESat Data With Airborne Laser Altimeter Measurements Over Arctic Sea Ice IEEE Trans. Geosci. Remote Sens., 46(7), 1913-1924
10.1109/TGRS.2008.916639

Maksym, T., and T. Markus (2008). Antarctic sea ice thickness and snow-to-ice conversion from atmospheric reanalysis and passive microwave snow depth J. Geophys. Res., 113(C02S12), 18 pp
10.1029/2006JC004085

Puthalapat, D., C. Leuschen, T. Markus, D.J. Cavalieri, B. Krabill, J.G. Sonntag, M. Sturm, and J. Maslanik (2008). Conjunctive Radar and Laser Altimetry Data Processing to Measure Snow Thickness Proc. IGARSS, 4, IV-1105 - IV-1108, 1

Worby, A.P., T. Markus, A.D. Steer, V.I. Lytle, and R.A. Massom (2008). Evaluation of AMSR-E snow depth product over East Antarctic sea ice using in situ measurements and aerial photography J. Geophys. Res., 113(C05S94), 13 pp
10.1029/2007JC004181

Kanagaratnam, P., T. Markus, V. Lytle, B. Heavey, P. Jansen, G. Prescott, and S.P. Gogineni (2007). Ultrawideband Radar Measurements of Thickness of Snow Over Sea Ice IEEE Trans. Geosci. Remote Sens., 45(9), 2715-2724

Kelly J., R.E., and T. Markus (2007). Analysis of time series of satellite passive microwave observations of snow over the Colorado Cold Lands Processes Experiment study region Proc. 64th Meeting of the Eastern Snow Conference

Perovich, D.K., S.V. Nghiem, T. Markus, and A. Schweiger (2007). Seasonal evolution and interannual variability of the local solar energy absorbed by the Arctic sea ice—ocean system J. Geophys. Res., 112(C03005), 13 pp

Tamura, T., K.I. Ohshima, T. Markus, D.J. Cavalieri, S. Nihashi, and N. Hirasawa (2007). Estimation of Thin Ice Thickness and Detection of Fast Ice from SSM/I Data in the Antarctic Ocean J. Atmos. Oce. Technol., 24(10), 1757-1772

Cavalieri, D.J., T. Markus, R.K. Raney, and A.J. Gasiewski Guest Editors (2006). Foreword to the March 2003 EOS Aqua AMSR-E Arctic Sea Ice Field Campaign Special Issue IEEE Trans. Geosci. Remote Sens., 44(11), 2999-3001

Cavalieri, D.J., T. Markus, J.A. Maslanik, M. Sturm, and E. Lobl (2006). March 2003 EOS Aqua AMSR-E Arctic Sea Ice Field Campaign IEEE Trans. Geosci. Remote Sens., 44(11), 3003-3008

Cavalieri, D.J., T. Markus, D.K. Hall, A. Gasiewski, M. Klein, and A. Ivanoff (2006). Assessment of EOS Aqua AMSR-E Arctic sea ice concentrations using airborne microwave and Landsat 7 imagery IEEE Trans. Geoscience Rem. Sens., 44, 3057-3069

Cavalieri, D.J., T. Markus, J. Maslanik, and M. Sturm (2006). March 2003 EOS Aqua AMSR-E Arctic sea ice field campaign IEEE Trans. Geosci. Remote Sensing, 44, 3003-3008

Cavalieri, D.J., and T. Markus (2006). EOS Aqua AMSR-E Arctic Sea Ice Validation Program: Arctic2003 Aircraft Campaign Flight Report NASA TM-2006-214142, 27

Heinrichs, J.F., D.J. Cavalieri, and T. Markus (2006). Assessment of the AMSR-E Sea Ice Concentration Product at the Ice Edge Using RADARSAT-1 and MODIS Imagery IEEE Trans. Geosci. Remote Sens., 44(11), 3070-3080

Markus, T., D.J. Cavalieri, A.J. Gasiewski, M. Klein, J. Maslanik, D.C. Powell, B. Stankov, J.C. Stoeve, and M. Sturm (2006). Microwave Signatures of Snow on Sea Ice: Observations IEEE Trans. Geosci. Remote Sens., 44(11), 3081-3090

Markus, T., D.C. Powell, and J.R. Wang (2006). Sensitivity of Passive Microwave Snow Depth Retrievals to Weather Effects and Snow Evolution IEEE Trans. Geosci. Remote Sens., 44(1), 68-77

Markus, T., D.J. Cavalieri, A. Gasiewski, M. Klein, J.A. Maslanik, D. Powell, J.C. Stroeve, and M. Sturm (2006). Microwave Signatures of Snow on Sea Ice: Observations IEEE Trans. Geosci. Remote Sensing, 44, 3081-3090

Markus, T., and D.J. Cavalieri (2006). Interannual and regional variability of Southern Ocean snow on sea ice Annals of Glaciology, 44, 53-57

Markus, T., D. Powell, and J. Wang (2006). Sensitivity of passive microwave snow depth retrievals to weather effects and snow evolution IEEE Trans. Geoscience and Remote Sensing, 44, 68-77

Powell, D.C., T. Markus, D.J. Cavalieri, A.J. Gasiewski, M. Klein, J.A. Maslanik, J.C. Stroeve, and M. Sturm (2006). Microwave Signatures of Snow on Sea Ice: Modeling IEEE Trans. Geosci. Remote Sensing, 44, 3091-3102

Stroeve, J.C., T. Markus, J.A. Maslanik, D.J. Cavalieri, A.J. Gasiewski, J.F. Heinrichs, J. Holmgren, D.K. Perovich, and M. Sturm (2006). Impact of Surface Roughness on AMSR-E Sea Ice Products IEEE Trans. Geosci. Remote Sensing, 44, 3103-3117

Bindschadler, R., H. Choi, C. Shuman, and T. Markus (2005). Detecting and measuring new snow accumulation on ice sheets by satellite remote sensing Remote Sens. Environ., 98, 388-402

Bindschadler, R., H. Choi, C. Shuman, and T. Markus (2005). Detecting and measuring new snow accumulation on ice sheets by satellite remote sensing Remote Sens. Environ., 98, 388-402

Bindschadler, R., H. Choi, C. Shuman, and T. Markus (2005). Detecting and measuring new snow accumulation on ice sheets by satellite remote sensing Rem. Sens. Env., 98, 388-402

Kanagaratnam, P., T. Markus, V. Lytle, B.G. Prescott, and P. Gogineni (2005). Ultra-wideband radar measurements of thickness of snow cover of sea ice IEEE Trans. Geoscience and Remote Sensing, (accepted w/ minor r

Perovich, D.K., S.V. Nghiem, and T. Markus (2005). Seasonal cycles and interannual variability of the portioning of solar energy by Arctic sea ice J. Geophys. Res., (accepted w/ minor r

Powell, D., T. Markus, and A. Stoessel (2005). The effects of snow depth forcing of Southern Ocean sea ice simulations J. Geophys. Res., 110, C06001
10.1029/2003JC002212

Tamura, T., K.I. Ohshima, T. Markus, D.J. Cavalieri, S. Nihashi, and N. Hirasawa (2005). Estimation of thin ice thickness and detection of fast ice from SSM/I data in the Antarctic Ocean J. Atm. Oceanic Techn., (submitted)

Cavalieri, D.J., J. Maslanik, T. Markus, J.C. Stoeve, M. Sturm, J. Heinrichs, E.J. Kim, A.J. Gasiewski, and J.C. Comiso (2003). EOS Aqua AMSR-E Arctic Sea Ice Validation Program Proc. SPIE Int. Soc. Opt. Eng., 4894, 413-424

Cavalieri, D.J., and T. Markus (2003). EOS Aqua AMSR-E Arctic Sea Ice Validation Program: Arctic 2003 Aircraft Campaign Flight Report NASA/TM 2003-212247, 44 pp

Cavalieri, D.J., and T. Markus (2003). EOS Aqua AMSR-E Arctic Sea Ice Validation Program: Arctic2003 Aircraft Campaign Flight Report NASA TM-2003-212247, 40

Comiso, J.C., D.J. Cavalieri, and T. Markus (2003). Sea ice concentration, ice temperature, and snow depth using AMSR-E data IEEE Trans. Geosci. Remote Sens., 41(2), 243-252

Gogineni, S., K. Wong, S. Krishnan, P. Kanagratnam, T. Markus, and V. Lytle (2003). An Ultra-wide Radar for Measurements of Snow Thickness Over Sea Ice Proc.IGARSS 2003, 4, 2802-2804

Markus, T., D.J. Cavalieri, M.A. Tschudi, and A. Ivanoff (2003). Comparison of aerial video and Landsat 7 data over ponded sea ice Remote Sens. Environ., 86, 458-469

Shokr, M., and T. Markus (2003). Evaluation of Ice Concentration Algorithms Using Data Fusion of SSM/I and Radarsat Proc. IGARSS 2003, 1, 65-67

Arrigo, K.R., G.L. van Dijken, T. Markus, M.A. Fahnestock, and D.G. Ainley (2002). Ecological impact of a large Antarctic iceberg Geophys. Res. Lett., 29(7), 8-1 - 8-4

Dokken, S.T., P. Winsor, T. Markus, J. Askne, and G. Bjrk (2002). ERS SAR characterization of coastal polynyas in the Arctic and comparison with SSM/I and numerical model investigations Rem. Sens. of Environ., 80, 321-335

Markus, T., and S.T. Dokken (2002). Evaluation of Late Summer Passive Microwave Artic Sea Ice Retrievals IEEE Trans. Geosci. Rem. Sens., 40(2), 348-356

Markus, T., D.J. Cavalieri, and A. Ivanoff (2002). The potential of using Landsat 7 ETM+ for the classification of sea-ice surface conditions during summer Ann. Glaciol., 34, 415-419

Markus, T., D.J. Cavalieri, and A. Ivanoff. (2002). The potential of using Landsat 7 data for the classification of sea ice surface conditions during summer Annals of Glaciology, 34, 415-419

Renfrew, I.A., J.C. King, and T. Markus (2002). Coastal polynyas in the southern Weddell Sea: Variability of the surface energy budget J. Geophys. Res., 107(C6), 16-1 - 16-22

Stoessel, A., and T. Markus (2002). Representation of Antarctic Coastal Polynyas in Ocean Climate Models: A Justification for Assimilation of Ice Concentration Proc. Report to NASA on a Workshop on Sea Ice Data Assimilation, 33