Hydrospheric and Biospheric Sciences Laboratory (614)
Profile for William Krabill
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| Title: | Physical Scientist |
|---|---|
| Affiliation: | Krabill&Krabill |
| Contact: |
E-mail Office Phone: 757-824-1417 Fax: 757-824-1036 |
Professional Experience
1991-Present
Project manager and Principal Investigator for airborne lidar topographic mapping and Global Positioning System (GPS) applications. Pioneered the use of carrier phase tracking of GPS signals on a moving platform that has led to postflight trajectory determination with an accuracy of 5-10 cm over distances exceeding several hundred kilometers. This capability led into the Arctic Ice Mapping (AIM) Project, wherein for each of the last 12 years the NASA P-3 has been instrumented with two laser remote sensors, several radar remote sensors, and multiple Global Positioning System (GPS) receivers, and collected more than 4,000,000,000 surface elevation measurements over extensive portions of the Greenland Ice Sheet - 65,000 kilometers of track line in 1998 and 1999 alone. PI and Team Leader for each of these annual Arctic deployments, managing the project and directing the planning, execution, and subsequent data processing and analysis. The result is a decade of repeating measurements for change detection studies, yielding a clear indication of significant thinning along the eastern and southern edges of the ice sheet, and a net negative mass balance for the entire Greenland ice sheet. As a result of these successful campaigns in the Arctic, the Project was tasked to conduct calibration/validation for ICESat, which employed a spaceborne laser altimeter for ice sheet measurements. He has also been asked to participate in similar cal/val activities for the European Space Agency’s Cryosat, another satellite dedicated to mapping the Cryosphere. In the meantime, as a spin-off activity, collaborated with the NOAA Coastal Services Center and the USGS Center for Coastal Geology to extending this remote sensing capability into mapping coastal regions during the off-season. The entire East Coast Shoreline has been mapped, including several repeat surveys following major storm events. Similarly a 1000 km survey of West Coast shoreline was conducted before and after the 1997-98 El Nino winter season. Additionally, the entire shoreline of Puerto Rico, and 600 km of the Gulf Coast have been mapped, with more coverage planned. Numerous federal, state, and local agencies as well as university researchers are using this extensive data set.
1982-1991: Scientist with the Observational Science Branch at Wallops Flight Facility.
1972-1982: Mathematician and Data Analyst for the Directorate of Applied Sciences at the Wallops Flight Center.
1968-1972: Mathematician and Data Analyst for the Radar Systems Section at the WFC.
Education
1972 - Satellite Aided Communications, Navigation, and Traffic Control, Purdue University
1970 - Advanced Mathematics courses, University of Virginia
1968 - B.S., Mathematics, Salisbury State College
Awards
Bill has received numerous GSFC Special Act and Exceptional Service Performance Awards over the last ten years. He was awarded the Code 970 Best Paper award in 1996 in the annual Peer Awards selections. In 2000 he was again awarded the Code 970 Best Paper award for the Science paper: “Rapid Thinning of Parts of the Southern Greenland Ice Sheet”. Also in 2000 he was awarded a GSFC Exceptional Service Performance Award. He was awarded the NASA Exceptional Achievement Medal in 1996 and again in 2000 for his accomplishments in Arctic Ice Mapping. At the 2004 American Geophysical Union Fall Meeting in San Francisco he was awarded the joint interagency NASA/USGS William T. Pecora award for outstanding contributions to understanding the Earth through remote sensing.
Links
The Airborne Topographic Mapper (ATM)
http://atm.wff.nasa.gov/
Code 614 at Wallops Flight Facility
http://science.wff.nasa.gov/
Selected Recent Publications
Abdalati, W., W. Krabill, E. Frederick, S. Manizade, C. Martin, J. Sonntag, R. Swift, R. Thomas, J. Yungel, and R. Koerner, 2004: Elevation changes of ice caps in the Canadian Arctic Archipelago, J. Geophys. Res., 109, F04007, doi:10.1029/2003JF000045.
Krabill, W., E. Hanna, P. Huybrechts, W. Abdalati, J. Cappelen, B. Csatho, E. Frederick, S. Manizade, C. Martin, J. Sonntag, R. Swift, R. Thomas, and J. Yungel, 2004: Greenland Ice Sheet: increased coastal thinning, Geophysical Research Letters 31 24, L24402, doi:10.1029/2004GL021533.
Rignot, E., G. Casassa, P. Gogineni, W. Krabill, A. Rivera, and R. Thomas, 2004: Accelerated ice discharge from the Antarctic Peninsula following the collapse of the Larsen B ice shelf, Geophys. Res. Lett., 31, L18401, doi:10.1029/2004GL020697.
Rignot, E., D. Braaten, S.P. Gogineni, W.B. Krabill, and J.R. McConnell, 2004: Rapid ice discharge from southeast Greenland glaciers, Geophys. Res. Lett., 31, 1-4.
Rignot, E., G. Casassa, S. Gogineni, P. Kanagaratnam, W. Krabill, H. Pritchard, A. Rivera, R. Thomas, J. Turner, and D. Vaughan, 2005: Recent ice loss from the Fleming and other glaciers, Wordie Bay, West Antarctic Peninsula, Geophys. Res. Lett., 32 (L07502), 4 pp.
Thomas, R., E. Rignot, G. Casassa, P. Kanagaratnam, C. Acuna, T. Akins, H. Brecher, E. Frederick, P. Gogineni, W. Krabill, S. Manizade, H. Ramamoorthy, A. Rivera, R. Russell, J. Sonntag, R. Swift, J. Yungel, and J. Zwally, 2004: Accelerated Sea-Level Rise from West Antarctica, Science, 306, 255-258.
Krabill, W.B., W. Abdalati, E.B. Frederick, S.S. Manizade, C.F. Martin, J.G. Sonntag, R.N. Swift, R.H. Thomas, J.G. Yungel, 2002. Aircraft laser altimetry measurement of elevation changes of the Greenland ice sheet: technique and accuracy assessment, J. Geodynamics 34 357-376.
Krabill, W., W. Abdalati, E. Frederick, S. Manizade, C. Martin, J. Sonntag, R. Swift, R. Thomas, W. Wright, and J. Yungel, Greenland Ice Sheet: High-elevation Balance and Peripheral Thinning, Science, Vol 289, No. 5478, pp. 428-429.
Krabill, W., E. Frederick, S. Manizade, C. Martin, J. Sonntag, R. Swift, R. Thomas, W. Wright, J. Yungel, Rapid Thinning of Parts of the Southern Greenland Ice Sheet, Science, 283:1522-1524, 1999.
Krabill, W., C. Wright, R. Swift, E. Frederick, S. Manizade, J. Yungel, C. Martin, J. Sonntag, M. Duffy, and J. Brock, 1999, Airborne Laser Mapping of Assateague National Seashore Beach, Photogrammetric Engineering & Remote Sensing, Vol. 66, No. 1 January 2000, pp. 65-71.
Krabill, W.B., R.H. Thomas, K. Jezek, C. Kuivinen, and S. Manizade, Greenland Ice Sheet Thickness Changes Measured by Laser Altimetry, Geophys. Res. Lett., 22(17), 2341-2344, 1995.
Krabill, W.B., R.H. Thomas, C.F. Martin, R.N. Swift, and E.B. Frederick, Accuracy of Airborne Laser Altimetry over the Greenland Ice Sheet, Int. J. Remote Sens., 16(7), 1211-1222, 1995.
Abdalati, W. and W.B. Krabill, Calculation of Ice Velocities in the Jakobshavn Isbrae Using Airborne Laser Altimetry, Remote Sens. Environ. 67:194-204 (1999).
Selected Publications
Kurtz, N.T., T. Markus, D.J. Cavalieri, L.C. Sparling, W. 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
Wright, C., E. Walsh, W. Krabill, W.A. Shaffer, S.R. Baig, M. Peng, L.J. Pietrafesa, A.W. Garcia, F.D. Marks Jr., P.G. Black, J. Sonntag, and B.D. Beckley (2009). Measuring Storm Surge with an Airborne Wide-Swath Radar Altimeter. J. Atmos. Oce. Technol., 26(10), 2200-2215
10.1175/2009JTECHO627.1
Arendt, A., S.B. Luthcke, C.F. Larsen, W. Abdalati, W. Krabill, and M.J. Beedle (2008). Validation of high-resolution GRACE mascon estimates of glacier mass changes in the St Elias Mountains, Alaska, USA, using aircraft laser altimetry. J. Glaciol., 54(188), 778-787
Csatho, B., T. Schenk, C.J. Van Der Veen, and W. Krabill (2008). Intermitten thinning of Jakobshavn Isbrae, West Greenland, since the Little Ice Age. J. Glaciol., 54(184), 131-144
10.3189/002214308784409035
Dobbs, M., W. Krabill, M. Cisewski, W. Harrison, C.K. Shum, D. McGregor, M. Neal, and S. Stokes (2008). A Multi-Functional Fiber Laser Lidar for Earth Science & Exploration. Proc. IGARSS, 3(III-350 - III-353, d)
Kurtz, N.T., T. Markus, D.J. Cavalieri, W. 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
Leuschen, C.J., R. Swift, J.C. Comiso, R.K. Raney, R.D. Chapman, W. Krabill, and J.G. Sonntag (2008). Combination of laser and radar altimeter height measurements to estimate snow depth during the 2004 Antarctic AMSR-E Sea Ice field campaign. J. Geophys. Res., 113(C04S90), 10 pp
10.1029/2007JC004285
Puthalapat, D., C. Leuschen, T. Markus, D.J. Cavalieri, W. 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
Thomas, R., C. Davis, E. Frederick, W. Krabill, Y. Li, S. Manizade, and C. Martin (2008). A comparison of Greenland ice-sheet volume changes derived from altimetry measurements. J. Glaciol., 185, 203-210
10.3189/002214308784886225
Giles, K.A., S.W. Laxon, D.J. Wingham, D.W. Wallis, W. Krabill, C.J. Leuschen, D. McAdoo, S. Manizade, and R.K. Raney (2007). Combined airborne laser and radar altimeter measurements over the Fram Strait in May 2002. Remote Sens. Environ., 111, 182-194
Thomas, R., E. Frederick, W. Krabill, S. Manizade, and C. Martin (2006). Progressive increase in ice loss from Greenland. Geophys. Res. Lett., 33(L10503), 1-4
Martin, C.F., R. Thomas, W. Krabill, and S. Manizade (2005). ICESat range and mounting bias estimation over precisely-surveyed terrain. Geophys. Res. Lett., 32(L21S07), 4 pp
Rignot, E., G. Casassa, S. Gogineni, P. Kanagaratnam, W. Krabill, H. Pritchard, A. Rivera, R. Thomas, J. Turner, and D. Vaughan (2005). Recent ice loss from the Fleming and other glaciers, Wordie Bay, West Antarctic Peninsula. Geophys. Res. Lett., 32(L07502), 4 pp
Abdalati, W., R. Swift, J.G. Sonntag, C. Martin, S. Manizade, E. Frederick, W. Krabill, R. Thomas, J. Yungel, and R. Koerner (2004). Elevation changes of ice caps in the Canadian Arctic Archipelago. J. Geophys. Res., 109(F04007), 1-11
Krabill, W., E. Hanna, P. Huybrechts, W. Abdalati, J. Cappelen, B. Csatho, E. Frederick, S. Manizade, C. Martin, J.G. Sonntag, R. Swift, R. Thomas, and J. Yungel (2004). Greenland Ice Sheet: Increased coastal thinning. Geophys. Res. Lett., 31, 1-4
Rignot, E., G. Casassa, P. Gogineni, W. Krabill, A. Rivera, and R. Thomas (2004). Accelerated ice discharge from the Antarctic Peninsula following the collapse of Larsen B ice shelf. Geophys. Res. Lett., 31, 1-4
Rignot, E., D. Braaten, S.P. Gogineni, W. Krabill, and J.R. McConnell (2004). Rapid ice discharge from southeast Greenland glaciers. Geophys. Res. Lett., 31, 1-4
Thomas, R., E. Rignot, G. Casassa, P. Kanagaratnam, C. Acuna, T. Akins, H. Brecher, E. Frederick, P. Gogineni, W. Krabill, S. Manizade, H. Ramamoorthy, A. Rivera, R. Russell, J.G. Sonntag, R. Swift, J. Yungel, and H.J. Zwally (2004). Accelerated Sea-Level Rise from West Antarctica. Science, 306, 255-258
Brock, J.C., W. Krabill, A.H. Sallenger, C.W. Wright, and R. Swift (2002). Basis and Methods of NASA Airborne Topographic Mapper Lidar Surveys For Coastal Studies. J. Coastal Res., 18(1), 1-13
Wright, C.W., E.J. Walsh, W. Krabill, D. Vandemark, A.W. Garcia, P.G. Black, F.D. Marks Jr., and R.A. Luettich Jr. (2002). Realtime Storm Surge Measurement with a Scanning Radar Altimeter. Proc. IGARSS 2002, 3, 1492-1495
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