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National Aeronautics and Space Administration

NASA's Arctic-Boreal Vulnerability Experiment

ABoVE

Schaefer-03 Project Profile
  (updated 28-Oct-2015)
Project Title:Remotely-Sensed Active Layer Thickness (ReSALT) Product Derived from InSAR Data Over North American Arctic Regions
Project Lead: Kevin Schaefer, National Snow and Ice Data Center
Project Funding: 2013 - 2016
NASA (agency representative: Diane Wickland)
Project Type:NASA -- joined ABoVE in 2013
Solicitation:NASA: Pre-ABoVE: Terrestrial Ecology (2012)
Abstract: Project Summary Study of the active layer and permafrost is one of the four science themes of the planned NASA-sponsored field campaign of the Arctic-Boreal Vulnerability Experiment (ABoVE). Data and information on the active layer and near-surface permafrost conditions are crucial for better understanding of the terrestrial ecosystem dynamics, sur ... [more]
ABoVE Science Questions
  • Permafrost
ABoVE Disciplinary Theme
  • Permafrost and Hydrology
Participants: Project Lead(s):Co-Investigator(s):

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Research
Contributions:
Status: Archived Date When Available: 2015-02-01
Product Title:  Pre-ABoVE: Remotely Sensed Active Layer Thickness, Prudhoe Bay, Alaska, 1992-2000
Description:  The InSAR Prudhoe Bay product includes 19922000 average Active Layer Thickness (ALT) for an 80x100 km study area of continuous permafrost on the North Slope of Alaska near Prudhoe Bay. ALT is about 3050 cm over moist tundra areas, and a larger ALT of 5080 cm over wet tundra areas. The InSAR estimated ALT values match in situ measurements at Circumpolar Active Layer Monitoring (CALM) sites within uncertainties. This dataset include Subsidence trends, ALT estimates, and the corresponding uncertainty map.
Expected Users:  scientists and researchers interested in environemntal change to Alaska's North Slope and the use of InSAR for Active Layer Thickness
Metadata URL(s):

http://dx.doi.org/10.3334/ORNLDAAC/1267
Data Server URL(s):

http://dx.doi.org/10.3334/ORNLDAAC/1267
Archived Data Citation:  Liu, L., K. Schaefer, A. Chen, A. Gusmeroli, E. Jafarov, S. Panda, A. Parsekian, T. Schaefer, H. A. Zebker, T. Zhang. 2015. Pre-ABoVE: Estimating 1999-2000 Average Active Layer Thickness, Alaskan North Slope. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. DOI: 10.3334/ORNLDAAC/1267


Status: Archived Date When Available: 2015-02-01
Product Title:  Pre-ABoVE: Remotely Sensed Active Layer Thickness, Barrow, Alaska, 2006-2011
Description:  We evaluated the Remotely Sensed Active Layer Thickness (ReSALT) product that uses the Interferometric Synthetic Aperture Radar technique to measure seasonal surface subsidence and infer ALT around Barrow, Alaska. We compared ReSALT with ground-based Active Layer Thickness (ALT) obtained using probing and calibrated, 500 MHz Ground Penetrating Radar at multiple sites around Barrow. We used a total of 9 PALSAR scenes between June and September and formed 20 interferograms with good coherence and without contamination by obvious ionospheric artifacts. ReSALT accurately reproduced observed ALT within uncertainty of the GPR and probing data in ~76% of the study area. However, ReSALT was less than observed ALT in ~22% of the study area with well-drained soils and in ~1% of the area where soils contained gravel. ReSALT was greater than observed ALT in some drained thermokarst lake basins representing ~1% of the area. This dataset include Subsidence trends, ALT estimates, and the corresponding uncertainty map.
Expected Users:  scientists and researchers interested in environmental change in Barrow, Alaska and the use of InSAR for Active Layer Thickness
Metadata URL(s):

http://dx.doi.org/10.3334/ORNLDAAC/1266
Data Server URL(s):

http://dx.doi.org/10.3334/ORNLDAAC/1266
Archived Data Citation:  Liu, L., K. Schaefer, A. Chen, A. Gusmeroli, E. Jafarov, S. Panda, A. Parsekian, T. Schaefer, H. A. Zebker, T. Zhang. 2015. Pre-ABoVE: Remotely Sensed Active Layer Thickness (ReSALT) Barrow, Alaska. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. DOI: 10.3334/ORNLDAAC/1266


Status: Archived Date When Available: 2015-09-01
Product Title:  Pre-ABoVE: Ground-penetrating Radar Measurements of ALT on the Alaska North Slope
Description:  This data set includes estimates of permafrost Active Layer Thickness (ALT; cm), and calculated uncertainties, derived using a ground-penetrating radar (GPR) system in the field in August 2014 near Toolik Lake and Happy Valley on the North Slope of Alaska. GPR measurements were taken along 10 transects of varying length (approx. 1 to 7 km). Traditional ALT estimates from mechanical probing every 100 to 500 m along each transect are also included. These data are suitable for future studies of how ALT varies over relatively large geological features, such as hills and valleys, wetland areas, and drained lake basins.
Expected Users:  scientists and researchers interested in environmental change in Barrow, Alaska and the use of InSAR for Active Layer Thickness, ABoVE researchers
Metadata URL(s):

http://dx.doi.org/10.3334/ORNLDAAC/1265
Data Server URL(s):

http://dx.doi.org/10.3334/ORNLDAAC/1265
Archived Data Citation:  Chen, A., A. Parsekian, K. Schaefer, E. Jafarov, S.K. Panda, L. Liu, T. Zhang, and H.A. Zebker. 2015. Pre-ABoVE: Ground-penetrating Radar Measurements of ALT on the Alaska North Slope. ORNL DAAC, Oak Ridge, Tennessee, USA. DOI: 10.3334/ORNLDAAC/1265


Status: Archived Date When Available:
Product Title:  Pre-ABoVE: Active Layer Thickness and Soil Water Content, Barrow, Alaska, 2013
Description:  This data set provides estimates of Active Layer Thickness (ALT) determined with ground-based measurements, and calculated soil volumetric water content (VWC) at four selected sites around Barrow, Alaska in August 2013. ALT was determined using a ground-penetrating radar (GPR) system and traditional mechanical probing. Calculated uncertainties are also included. GPR measurements were taken along four transects of varying length (approx. 1 to 7 km). Mechanical probing included several high-density surveys (every 1 m within 100-m survey line) along each GPR transect. VWC of the active layer soil was calculated at 3-8 calibration points per site where the probe measurement was exactly co-located with a GPR trace.
Expected Users:  scientists and researchers interested in environmental change in Barrow, Alaska and the use of InSAR for Active Layer Thickness
Metadata URL(s):

http://dx.doi.org/10.3334/ORNLDAAC/1355
Data Server URL(s):

http://dx.doi.org/10.3334/ORNLDAAC/1355
Archived Data Citation:  Jafarov, E., A. Parsekian, K. Schaefer, L. Liu, A. Chen, S.K. Panda, and T. Zhang. 2016. Pre-ABoVE: Active Layer Thickness and Soil Water Content, Barrow, Alaska, 2013. ORNL DAAC, Oak Ridge, Tennessee, USA. DOI: 10.3334/ORNLDAAC/1355

 
Publications: Gusmeroli, A., Liu, L., Schaefer, K., Zhang, T., Schaefer, T., Grosse, G. 2015. Active Layer Stratigraphy and Organic Layer Thickness at a Thermokarst Site in Arctic Alaska Identified Using Ground Penetrating Radar. Arctic, Antarctic, and Alpine Research. 47(2), 195-202. DOI: 10.1657/AAAR00C-13-301

Liu, L., Schaefer, K., Gusmeroli, A., Grosse, G., Jones, B. M., Zhang, T., Parsekian, A. D., Zebker, H. A. 2014. Seasonal thaw settlement at drained thermokarst lake basins, Arctic Alaska. The Cryosphere. 8(3), 815-826. DOI: 10.5194/tc-8-815-2014

Schaefer, K., Liu, L., Parsekian, A., Jafarov, E., Chen, A., Zhang, T., Gusmeroli, A., Panda, S., Zebker, H., Schaefer, T. 2015. Remotely Sensed Active Layer Thickness (ReSALT) at Barrow, Alaska Using Interferometric Synthetic Aperture Radar. Remote Sensing. 7(4), 3735-3759. DOI: 10.3390/rs70403735

Liu, L., Jafarov, E. E., Schaefer, K. M., Jones, B. M., Zebker, H. A., Williams, C. A., Rogan, J., Zhang, T. 2014. InSAR detects increase in surface subsidence caused by an Arctic tundra fire. Geophysical Research Letters. 41(11), 3906-3913. DOI: 10.1002/2014GL060533

Archived Data Citations: Liu, L., K. Schaefer, A. Chen, A. Gusmeroli, E. Jafarov, S. Panda, A. Parsekian, T. Schaefer, H. A. Zebker, T. Zhang. 2015. Pre-ABoVE: Estimating 1999-2000 Average Active Layer Thickness, Alaskan North Slope. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. DOI: 10.3334/ORNLDAAC/1267

Liu, L., K. Schaefer, A. Chen, A. Gusmeroli, E. Jafarov, S. Panda, A. Parsekian, T. Schaefer, H. A. Zebker, T. Zhang. 2015. Pre-ABoVE: Remotely Sensed Active Layer Thickness (ReSALT) Barrow, Alaska. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. DOI: 10.3334/ORNLDAAC/1266

Chen, A., A. Parsekian, K. Schaefer, E. Jafarov, S.K. Panda, L. Liu, T. Zhang, and H.A. Zebker. 2015. Pre-ABoVE: Ground-penetrating Radar Measurements of ALT on the Alaska North Slope. ORNL DAAC, Oak Ridge, Tennessee, USA. DOI: 10.3334/ORNLDAAC/1265

Jafarov, E., A. Parsekian, K. Schaefer, L. Liu, A. Chen, S.K. Panda, and T. Zhang. 2016. Pre-ABoVE: Active Layer Thickness and Soil Water Content, Barrow, Alaska, 2013. ORNL DAAC, Oak Ridge, Tennessee, USA. DOI: 10.3334/ORNLDAAC/1355

2015 NASA Carbon Cycle & Ecosystems Joint Science Workshop Poster(s)
  • Realizing the full potential of Remotely Sensed Active Layer Thickness (ReSALT) Products   --   (Kevin M Schaefer, Albert Chen, Lin Liu, Andrew Parsekian, Elchin Jafarov, Santosh Panda, Howard Zebker)   [abstract]

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