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Thermokarst lakes are thought to have been an important source of methane (CH4) during the last deglaciation when atmospheric CH4 concentrations increased rapidly. Here we demonstrate that meltwater from permafrost ice serves as an H source to CH4 production in thermokarst lakes, allowing for region-specific reconstructions of ?DCH4 emissions from Siberian and North American lakes. ?DCH4 reflects regionally varying ?D values of precipitation incorporated into ground ice at the time of its formation. Late Pleistocene-aged permafrost ground ice was the dominant H source to CH4 production in primary thermokarst lakes, whereas Holocene-aged permafrost ground ice contributed H to CH4 production in later generation lakes....
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Loads and yields of dissolved and particulate nitrogen (N) and phosphorus (P) were measured and modeled at three locations on the Yukon River (YR) and on the Tanana and Porcupine Rivers in Alaska during 2001?2005. Total export of N and P upstream of Yukon Delta averaged 120 Gg N a?1 and 56 Gg P a?1, respectively, with 43.5% of total N (TN) as dissolved organic N, and 98% of total P (TP) as particulate phosphorus. Approximately half of the annual export of TN and TP occurred during spring. Hydrologic yields of TN (5.6?13.3 mmol N m?2 a?1) and TP (0.8?9.0 mmol P m?2 a?1) were least in the Porcupine basin and greatest in the Tanana basin and were proportional to water yield. Comparison of current and historical dissolved...


map background search result map search result map CLIMATE SINGALS IN STREAMBED ELEVATIONS OF GLACIAL RIVERS IN SOUTHCENTRAL ALASKA Criteria for Instream Water Rights for Selected Lakes in the Kenai National Wildlife Refuge An assessment of trophic status of 25 lakes in the Matanuska-Susitna borough, Alaska Baseline Channel Morphology and Bank Erosion Inventory of South Fork Campbell Creek at Campbell Tract, Anchorage, Alaska, 1999 and 2000 CENTRAL REGION LIMNOLOGY 2001 ANNUAL REPORT OF PROGRESS Peel River Basin Water Quality Report Cottonwood Creek TMDL Development—Residue. Final Report for the Alaska Department of Environmental Conservation Little Susitna Water Quality Monitoring Report (March 2005-April 2006). Final Report for the Alaska Department of Environmental Conservation Nutrient (N, P) loads and yields at multiple scales and subbasin types in the Yukon River basin, Alaska Hatcher Pass Water Quality Sampling Report FRPA Effectiveness Monitoring within the Willer-Kash State Forest Harvest Area: July 2006 through May 2008 Summary. Final Report for the Alaska Department of Environmental Conservation Hatcher Pass Water Quality Sampling Report (May 2007 through February 2008). Prepared for the Matanuska-Susitna Borough Long-term change in limnology and invertebrates in Alaskan boreal wetlands Fecal coliform bacteria source assessment in the waters of Cottonwood Creek, Wasilla, and Little Campbell Creek, Anchorage. Final Report for the Alaska Department of Environmental Conservation Hatcher Pass Water Quality Sampling Report (May 2010 through April 2011). Final report for the Matanuska-Susitna Borough The influence of stream-crossing structures on the distribution of rearing juvenile Pacific salmon Matanuska-Susitna Stormwater Assessment: 2011-2012. Final Report for the Alaska Department of Environmental Conservation Switching predominance of organic versus inorganic carbon exports from an intermediate‐size subarctic watershed Baseline Channel Morphology and Bank Erosion Inventory of South Fork Campbell Creek at Campbell Tract, Anchorage, Alaska, 1999 and 2000 Hatcher Pass Water Quality Sampling Report Hatcher Pass Water Quality Sampling Report (May 2007 through February 2008). Prepared for the Matanuska-Susitna Borough Hatcher Pass Water Quality Sampling Report (May 2010 through April 2011). Final report for the Matanuska-Susitna Borough Cottonwood Creek TMDL Development—Residue. Final Report for the Alaska Department of Environmental Conservation Fecal coliform bacteria source assessment in the waters of Cottonwood Creek, Wasilla, and Little Campbell Creek, Anchorage. Final Report for the Alaska Department of Environmental Conservation Criteria for Instream Water Rights for Selected Lakes in the Kenai National Wildlife Refuge An assessment of trophic status of 25 lakes in the Matanuska-Susitna borough, Alaska FRPA Effectiveness Monitoring within the Willer-Kash State Forest Harvest Area: July 2006 through May 2008 Summary. Final Report for the Alaska Department of Environmental Conservation Matanuska-Susitna Stormwater Assessment: 2011-2012. Final Report for the Alaska Department of Environmental Conservation Switching predominance of organic versus inorganic carbon exports from an intermediate‐size subarctic watershed Long-term change in limnology and invertebrates in Alaskan boreal wetlands CLIMATE SINGALS IN STREAMBED ELEVATIONS OF GLACIAL RIVERS IN SOUTHCENTRAL ALASKA Little Susitna Water Quality Monitoring Report (March 2005-April 2006). Final Report for the Alaska Department of Environmental Conservation The influence of stream-crossing structures on the distribution of rearing juvenile Pacific salmon Peel River Basin Water Quality Report CENTRAL REGION LIMNOLOGY 2001 ANNUAL REPORT OF PROGRESS Nutrient (N, P) loads and yields at multiple scales and subbasin types in the Yukon River basin, Alaska