TY - JOUR T1 - Carbon export and cycling by the York, Tanana and Porcupine Rivers, Alaska, 2001-2005 JF - Water Resources Res. Y1 - 2007 A1 - Striegl, R. G. A1 - Dornblaser, M. M. A1 - Aiken, G. R. A1 - Wickland, K. P. A1 - Raymond, P. A. VL - 43 N1 - id: 1162 ER - TY - JOUR T1 - Flux and age of dissolved organic carbon exported to the Arctic Ocean: A carbon isotopic study of the five largest arctic rivers RID C-4087-2009 RID C-5396-2008 JF - Global Biogeochemical Cycles Y1 - 2007 A1 - Raymond, Peter A. A1 - McClelland, J. W. A1 - Holmes, R. M. A1 - Zhulidov, A. V. A1 - Mull, K. A1 - Peterson, B. J. A1 - Striegl, R. G. A1 - Aiken, G. R. A1 - Gurtovaya, T. Y. AB - The export and Delta C-14-age of dissolved organic carbon (DOC) was determined for the Yenisey, Lena, Ob', Mackenzie, and Yukon rivers for 2004 - 2005. Concentrations of DOC elevate significantly with increasing discharge in these rivers, causing approximately 60% of the annual export to occur during a 2-month period following spring ice breakup. We present a total annual flux from the five rivers of similar to 16 teragrams (Tg), and conservatively estimate that the total input of DOC to the Arctic Ocean is 25 - 36 Tg, which is similar to 5-20% greater than previous fluxes. These fluxes are also similar to 2.5 x greater than temperate rivers with similar watershed sizes and water discharge. Delta C-14-DOC shows a clear relationship with hydrology. A small pool of DOC slightly depleted in Delta C-14 is exported with base flow. The large pool exported with spring thaw is enriched in D14C with respect to current-day atmospheric Delta C-14-CO2 values. A simple model predicts that similar to 50% of DOC exported during the arctic spring thaw is 1 - 5 years old, similar to 25% is 6 - 10 years in age, and 15% is 11 - 20 years old. The dominant spring melt period, a historically undersampled period, exports a large amount of young and presumably semilabile DOC to the Arctic Ocean. VL - 21 IS - 4 N1 - id: 2033; PT: J; UT: WOS:000250704000002 JO - Flux and age of dissolved organic carbon exported to the Arctic Ocean: A carbon isotopic study of the five largest arctic rivers RID C-4087-2009 RID C-5396-2008 ER - TY - JOUR T1 - A decrease in discharge-normalized DOC export by the Yukon River during summer through autumn JF - Geophysical Research Letters Y1 - 2005 A1 - Striegl, R. G. A1 - Aiken, G. R. A1 - Dornblaser, M. M. A1 - Raymond, P. A. A1 - Wickland, K. P. KW - alaska KW - arctic-ocean KW - climate-change KW - CO2 KW - discontinuous permafrost KW - dissolved organic-carbon KW - flux KW - MATTER KW - tundra AB - Climate warming is having a dramatic effect on the vegetation distribution and carbon cycling of terrestrial subarctic and arctic ecosystems. Here, we present hydrologic evidence that warming is also affecting the export of dissolved organic carbon and bicarbonate (DOC and HCO3-) at the large basin scale. In the 831,400 km(2) Yukon River basin, water discharge (Q) corrected DOC export significantly decreased during the growing season from 1978 - 80 to 2001 - 03, indicating a major shift in terrestrial to aquatic C transfer. We conclude that decreased DOC export, relative to total summer through autumn Q, results from increased flow path, residence time, and microbial mineralization of DOC in the soil active layer and groundwater. Counter to current predictions, we argue that continued warming could result in decreased DOC export to the Bering Sea and Arctic Ocean by major subarctic and arctic rivers, due to increased respiration of organic C on land. VL - 32 SN - 0094-8276 UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=WOS:000233354500009 IS - 21 N1 - 985cuTimes Cited:163 Cited References Count:28 JO - Geophys Res Lett ER -