HR: 0800h
AN: C41A-0188    [Abstracts]
TI: A Preliminary Evaluation of Carbon Sources and Ages Exported By Major Arctic Rivers
AU: Raymond, P
EM: peter.raymond@yale.edu
AF: Yale School of Forestry and Environmental Studies, 21 Sachem St, New Haven, CT 06511 United States
AU: * McClelland, J
EM: jmcclelland@mbl.edu
AF: Marine Biological Lab, 7 MBL St, Woods Hole, MA 02543 United States
AU: Striegl, R
EM: rstriegl@usgs.gov
AF: USGS, Box 25046 MS 413 , Denver, CO 80255 United States
AU: Holmes, M
EM: rholmes@mbl.edu
AF: Marine Biological Lab, 7 MBL St, Woods Hole, MA 02543 United States
AU: Peterson, B
EM: peterson@mbl.edu
AF: Marine Biological Lab, 7 MBL St, Woods Hole, MA 02543 United States
AB: An overall goal of the PARTNERS project is to determine the fate of continental runoff and investigate the biogeochemical make up of runoff originating from different regions of the Arctic. Carbon isotopic (13C and 14C) investigations of bulk carbon pools provide important information on their sources and ages. With respect to global change, shifts in the isotopic signatures of different carbon pools can provide important evidence that the sources and/or processing of terrestrial carbon have undergone fundamental changes. Furthermore, there is a rising concern that as the Arctic warms a portion of the large amount of carbon sequestered in soils and peat might be mobilized to atmospheric and ocean reservoirs. One approach for detect such a mobilization is 14C-aging of major carbon pool in rivers. In this presentation we will evaluate carbon data collected during summer 2003 for 5 major arctic rivers (Ob, Yenisey, Mackenzie, Yukon, and Lena). 14C will be used to estimate average ages of dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), and particulate organic carbon (POC) being transported in river waters. 13C data will be used to further clarify organic matter sources. Contextual data on alkalinity, pCO2, carbonate, and bicarbonate concentrations in the 5 rivers will also be presented.
DE: 1055 Organic geochemistry
DE: 1615 Biogeochemical processes (4805)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting