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Satellite Microwave remote sensing of contrasting surface water inundation changes within the Arctic–Boreal Region

Watts, Jennifer D. ; Kimball, John S. ; Jones, Lucas A. ; Schroeder, Ronny ; McDonald, Kyle C.

Remote sensing of environment, 2012-12, Vol.127, p.223-236 [Periódico revisado por pares]

New York, NY: Elsevier Inc

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  • Título:
    Satellite Microwave remote sensing of contrasting surface water inundation changes within the Arctic–Boreal Region
  • Autor: Watts, Jennifer D. ; Kimball, John S. ; Jones, Lucas A. ; Schroeder, Ronny ; McDonald, Kyle C.
  • Assuntos: AMSR ; Animal, plant and microbial ecology ; Applied geophysics ; Arctic ; Biological and medical sciences ; Climate change ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Fundamental and applied biological sciences. Psychology ; General aspects. Techniques ; Internal geophysics ; Inundation ; Landsat ; MODIS ; Permafrost ; Teledetection and vegetation maps
  • É parte de: Remote sensing of environment, 2012-12, Vol.127, p.223-236
  • Descrição: Surface water inundation in the Arctic–Boreal region is dynamic and strongly influences land-atmosphere water, energy and carbon (CO2, CH4) fluxes, and potential feedbacks to climate change. Here we report on recent (2003–2010) surface inundation patterns across the Arctic–Boreal region (≥50°N) and within major permafrost (PF) zones detected using satellite passive microwave remote sensing retrievals of daily fractional open water (Fw) cover from the Advanced Microwave Scanning Radiometer for EOS (AMSR-E). The AMSR-E Fw (25-km resolution) maps reflect strong microwave sensitivity to sub-grid scale open water variability and compare favorably (0.71≤R2≤0.84) with alternative, static Fw maps derived from finer scale (30-m to 250-m resolution) Landsat, MODIS and SRTM radar (MOD44W) data. The AMSR-E retrievals show dynamic seasonal and annual variability in surface inundation that is unresolved in the static Fw maps. The AMSR-E Fw record also corresponds strongly (0.71≤R≤0.87) with regional wet/dry cycles inferred from basin discharge records. An AMSR-E algorithm sensitivity analysis shows a conservative estimate of Fw retrieval uncertainty (RMSE) within ±4.1% for effective resolution of regional inundation patterns and seasonal to annual variability. A regional trend analysis of the 8-year AMSR-E record shows no significant Arctic–Boreal region wide Fw trend for the period, and instead reveals contrasting inundation changes within different PF zones. Widespread Fw wetting is detected within continuous (92% of grid cells with significant trend; p<0.1) and discontinuous (82%) PF zones, while sporadic/isolated PF areas show widespread (71%) Fw drying trends. These results are consistent with previous studies showing evidence of contrasting regional inundation patterns linked to PF degradation and associated changes to surface hydrology under recent climate warming. ► We evaluate surface inundation changes in the Arctic–Boreal region from 2003 to 2010. ► AMSR-E passive microwave analysis effectively captures surface water variability. ► Contrasting inundation changes are observed within the major permafrost (PF) zones. ► Continuous PF shows widespread wetting; drying predominates in more degraded PF.
  • Editor: New York, NY: Elsevier Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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