Dr. Eni Njoku is the Supervisor of the Water and Carbon Cycles Group. His current research interests are focused primarily on surface-atmosphere processes of the global water cycle and climate using spaceborne passive and active microwave techniques. He is a member of the EOS Aqua Advanced Microwave Scanning Radiometer (AMSR-E) science team, and was project scientist for the recent Hydros ESSP mission, investigating surface soil moisture and its role in hydrologic and ecological modeling, weather and climate prediction, and monitoring of natural hazards.

Dr. Njoku's other research activities have included: applications of microwave sensing and geophysical retrievals from spaceborne data in the land, ocean, atmosphere, and cryosphere disciplines; technology studies utilizing large deployable antennas for spaceborne microwave sensing; and field campaigns for land surface studies using airborne microwave radiometers and radar systems. Dr. Njoku is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE).

• Ph.D., Electrical Engineering, Massachusetts Inst. of Technology (1976)
• M.S., Electrical Engineering, Massachusetts Inst. of Technology (1974)
• B.A., Natural Sciences/Electrical Sciences, Cambridge University (1972)

• Jet Propulsion Laboratory (1977-Present)
  • Project Scientist, Hydros mission (2001-2006)
  • Aqua/AMSR-E science team member for soil moisture (1996-present)
  • Co-organizer of SMEX02, 03, 04 field experiments
  • Senior Research Scientist (2006-present)
  • Principal Scientist (2001-2006)
  • Research Scientist (1977-2001)
• Visiting Professor, Dept. of Civil & Environ. Engineering, MIT. (2001-2002)
• Section Manager, Geology and Planetology Section, JPL (1993-1994)
• Program Scientist, Ocean Processes Branch and Earth Science Data and Information Systems, NASA Headquarters (1986-1990)
• Associate Professor, Dept. of Engineering, Harvey Mudd College, Claremont, CA (1984-1986)
• Senior Lecturer, Dept. of Electrical Engineering, Institute of Management & Technology, Enugu, Nigeria (1980-1981)
• National Academy of Sciences/National Research Council Postdoctoral Research Associate, Jet Propulsion Laboratory. (1976-1977)

• English-Speaking Union, King George VI Memorial Scholarship (1972)
• National Acad. of Sciences/NRC, Resident Research Associateship (1976)
• NASA Group Achievement Awards (1980, 1982, 1985)
• NASA Exceptional Service Medal (1985)
• Fellow, Institute of Electrical and Electronics Engineers (IEEE) (1995)
• Visiting Fellow, Massachusetts Institute of Technology (2001-02)

1. Entekhabi, D., E. Njoku, P. Houser, M. Spencer, T. Doiron, J. Smith, R. Girard, S. Belair, W. Crow, T. Jackson, Y. Kerr, J. Kimball, R. Koster, K. McDonald, P. O'Neill, T. Pulz, S. Running, J. Shi, E. Wood, and J. van Zyl (2004): The Hydrosphere State mission (HYDROS): An earth system pathfinder for global mapping of soil moisture and land freeze/thaw, IEEE Trans. Geosci. Rem. Sens., 42, 21842195.
2. McDonald, K. C., J. S. Kimball, E. Njoku, R. Zimmermann, and M. Zhao (2004): Variability in springtime thaw in the terrestrial high latitudes: Monitoring a major control on the biospheric assimilation of atmospheric CO2 with spaceborne microwave remote sensing, Earth Interactions, 8, 123.
3. Njoku, E., V. Lakshmi, and P. ONeill (2004): Preface: Soil moisture field experiment (SMEX02) special issue, Rem. Sens. Environ., 92, 425426.
4. Narayan, U., V. Lakshmi, and E. Njoku (2004): Retrieval of soil moisture from passive and active L/S band sensor (PALS) observations during the soil moisture experiment in 2002 (SMEX02), Rem. Sens. Environ., 92, 483496.
5. Limaye, A., W. Crosson, C. Laymon, and E. Njoku (2004): Landcover-based optimal deconvolution of PALS L-band microwave brightness temperatures, Rem. Sens Environ., 92, 497506.
6. Njoku, E., T. Chan, W. Crosson, and A. Limaye (2004): Evaluation of the AMSR-E data calibration over land, Rivista Italiana Di Telerilevamento (Italian Journal of Remote Sensing), 30/31, 1937 (in English).
7. Long, D. G., M. W. Spencer, and E. G. Njoku (2005): Spatial resolution and processing tradeoffs for HYDROS: Application of reconstruction and resolution enhancement techniques, IEEE Trans. Geosci. Rem. Sens., 43, 312.
8. Evans, D. L., W. Alpers, A. Cazenave, C. Elachi, T. Farr, D. Glackin, B. Holt, L. Jones, W. T. Liu, W. McCandless, Y. Menard, R. Moore, and E. Njoku (2005): SeasatA 25-year legacy of success, Rem. Sens. Environ., 94, 384404.
9. Njoku, E., P. Ashcroft, and L. Li (2005): Statistics and global survey of radio-frequency interference in AMSR-E land observations, IEEE Trans. Geosci. Rem. Sens., 43, 938947.
10. Crow, W., T. Chan, D. Entekhabi, P. Houser, A. Hsu, T. Jackson, E. Njoku, P. ONeill, J. Shi, and X. Zhan (2005): An observing system simulation experiment for Hydros radiometer-only soil moisture products, IEEE Trans. Geosci. Rem. Sens., 43, 12391303.
11. Jackson, T. J., R. Bindlish, A. J. Gasiewski, B. Stankov, M. Klein, E. G. Njoku, T. L. Coleman, C. Laymon, and P. Starks (2005): Polarimetric Scanning Radiometer C and X-band microwave observations during SMEX03, IEEE Trans. Geosci. Rem. Sens., 43, 24182430.
12. Merlin, O., A. G. Chehbouni, Y. H. Kerr, E. G. Njoku, and D. Entekhabi (2005): A combined modeling and multi-spectral/multi-resolution remote sensing approach for disaggregation of surface soil moisture: Application to SMOS configuration, IEEE Trans. Geosci. Rem. Sens., 43, 20362050.
13. Njoku, E.G. and T. K. Chan (2006): Vegetation and surface roughness effects on AMSR-E land observations, Rem. Sens. Environ., 100, 190199.
14. Dunne, S., D. Entekhabi, and E. Njoku (in press): Assimilation of multi-resolution L-band observations to estimate soil moisture over the Arkansas-Red river basin using the ensemble Kalman smoother, IEEE Trans. Geosci. Rem. Sens.