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High resolution mapping of peatland hydroperiod at a high-latitude Swedish mire

Author:
  • N. Torbick
  • Andreas Persson
  • D. Olefeldt
  • S. Frolking
  • W. Salas
  • S. Hagen
  • P. Crill
  • C. S. Li
Publishing year: 2012
Language: English
Pages: 1974-1994
Publication/Series: Remote Sensing
Volume: 4
Issue: 7
Document type: Journal article
Publisher: MDPI AG

Abstract english

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 (R-2 = 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

  • Physical Geography
  • palsar
  • lidar
  • mire
  • hydroperiod
  • high latitude wetlands
  • permafrost
  • l-band
  • carbon sequestration
  • sar data
  • c-band
  • radar
  • imagery
  • decomposition
  • polarimetry
  • parameters
  • vegetation

Other

Published
  • ISSN: 2072-4292
E-mail: andreas [dot] persson [at] nateko [dot] lu [dot] se

Senior lecturer

Dept of Physical Geography and Ecosystem Science

+46 46 222 42 62

GIS-centrum 103

16

Senior lecturer

Centre for Geographical Information Systems (GIS Centre)

+46 46 222 42 62

16

Teaching staff

Dept of Physical Geography and Ecosystem Science

16

Department of Physical Geography and Ecosystem Science
Lund University
Sölvegatan 12
S-223 62 Lund
Sweden

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