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We examined the effects of fire disturbance on permafrost degradation and thaw settlement across a series of wildfires (from ~1930 to 2010) in the forested areas of collapse-scar bog complexes in the Tanana Flats lowland of interior Alaska. Field measurements were combined with numerical modeling of soil thermal dynamics to assess the roles of fire severity and climate history in postfire permafrost dynamics. Field-based calculations of potential thaw settlement following the loss of remaining ice-rich permafrost averaged 0.6 m. This subsidence would cause the surface elevations of forests to drop on average 0.1 m below the surface water level of adjacent collapse-scar features. Up to 0.5 m of thaw settlement was...
Categories: Data,
Publication;
Types: Citation,
Downloadable,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
Shapefile;
Tags: Adaptation planning 1-Best management practices,
Modeling,
Monitoring 1-Changes in Plant and Animal Distribution: Ecosystems,
Monitoring 3-Improve Permafrost Mapping,
and Monitoring, All tags...
landscape scale conservation: Fire, Fewer tags
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Water samples were collected biweekly from the Chena River, Alaska, during 2005-2006 for analysis of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), total dissolved carbohydrate (TCHO), including monosaccharide (MCHO) and polysaccharide (PCHO), particulate organic carbon (POC) and its isotopic compositions, and Si(OH) sub(4). Carbon species exhibit strong temporal variations with elevated DOC, POC, and TCHO but depleted DIC and Si(OH) sub(4) during the spring freshet and decreased DOC, POC, and TCHO but elevated DIC and Si(OH) sub(4) concentrations under winter ice. Organic matter is mostly derived from surface soil leaching, whereas DIC and Si(OH) sub(4) are associated with groundwater and mineral...
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Water samples were collected biweekly from the Chena River, Alaska, during 2005-2006 for analysis of dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), total dissolved carbohydrate (TCHO), including monosaccharide (MCHO) and polysaccharide (PCHO), particulate organic carbon (POC) and its isotopic compositions, and Si(OH) sub(4). Carbon species exhibit strong temporal variations with elevated DOC, POC, and TCHO but depleted DIC and Si(OH) sub(4) during the spring freshet and decreased DOC, POC, and TCHO but elevated DIC and Si(OH) sub(4) concentrations under winter ice. Organic matter is mostly derived from surface soil leaching, whereas DIC and Si(OH) sub(4) are associated with groundwater and mineral...
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