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High Resolution Mapping of Peatland Hydroperiod at a High-Latitude Swedish Mire
Applied Geosolutions, 403 Kent Place, Newmarket, NH 03824, USA
Department of Physical Geography and Ecosystem Sciences, Lund University, Sölvegatan 12, SE-22100 Lund, Sweden
Department of Integrative Biology, University of Guelph, Science Complex, Guelph, ON N1G 2W1, Canada
Earth Systems Research Center, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, 8 College Road, Durham, NH 03824, USA
Department of Geological Sciences, Stockholm University, 10691 Stockholm, Sweden
* Author to whom correspondence should be addressed.
Received: 28 April 2012; in revised form: 7 June 2012 / Accepted: 26 June 2012 / Published: 29 June 2012
Abstract: Monitoring high latitude wetlands is required to understand feedbacks between terrestrial carbon pools and climate change. Hydrological variability is a key factor driving biogeochemical processes in these ecosystems and effective assessment tools are critical for accurate characterization of surface hydrology, soil moisture, and water table fluctuations. Operational satellite platforms provide opportunities to systematically monitor hydrological variability in high latitude wetlands. The objective of this research application was to integrate high temporal frequency Synthetic Aperture Radar (SAR) and high spatial resolution Light Detection and Ranging (LiDAR) observations to assess hydroperiod at a mire in northern Sweden. Geostatistical and polarimetric (PLR) techniques were applied to determine spatial structure of the wetland and imagery at respective scales (0.5 m to 25 m). Variogram, spatial regression, and decomposition approaches characterized the sensitivity of the two platforms (SAR and LiDAR) to wetland hydrogeomorphology, scattering mechanisms, and data interrelationships. A Classification and Regression Tree (CART), based on random forest, fused multi-mode (fine-beam single, dual, quad pol) Phased Array L-band Synthetic Aperture Radar (PALSAR) and LiDAR-derived elevation to effectively map hydroperiod attributes at the Swedish mire across an aggregated warm season (May–September, 2006–2010). Image derived estimates of water and peat moisture were sensitive (R2 = 0.86) to field measurements of water table depth (cm). Peat areas that are underlain by permafrost were observed as areas with fluctuating soil moisture and water table changes.
Keywords: PALSAR; LiDAR; mire; hydroperiod; high latitude wetlands; permafrost
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Torbick, N.; Persson, A.; Olefeldt, D.; Frolking, S.; Salas, W.; Hagen, S.; Crill, P.; Li, C. High Resolution Mapping of Peatland Hydroperiod at a High-Latitude Swedish Mire. Remote Sens. 2012, 4, 1974-1994.
Torbick N, Persson A, Olefeldt D, Frolking S, Salas W, Hagen S, Crill P, Li C. High Resolution Mapping of Peatland Hydroperiod at a High-Latitude Swedish Mire. Remote Sensing. 2012; 4(7):1974-1994.
Torbick, Nathan; Persson, Andreas; Olefeldt, David; Frolking, Steve; Salas, William; Hagen, Stephen; Crill, Patrick; Li, Changsheng. 2012. "High Resolution Mapping of Peatland Hydroperiod at a High-Latitude Swedish Mire." Remote Sens. 4, no. 7: 1974-1994.