B23C:
New Insights and Approaches for Recent Dating of Peat and Aquatic Sediments Posters

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Session ID#: 12833

Session Description:
Establishing chronologies of peats and sediments on a 102-year (recent) timescale is important for quantifying processes such as carbon sequestration, vertical accretion, and changes in contaminant loading in a range of wetland and aquatic ecosystems.  Determining uncertainties in dating is key to achieving good estimates, yet, of the many approaches available (i.e.,137Cs, 210Pb, 14C wiggle-matching, fly ash, tephra, organic and inorganic pollutant time markers, 241Am, 207Bi, pollen, etc.), few routinely incorporate error analyses.  For this session, we are interested in assessing uncertainties in recent dating methods and identifying conditions under which a particular technique works best, fails or has high uncertainties and why.  We welcome papers emphasizing (1) new or adapted empirical models, which improve dating accuracy, (2) protocols for better quantifying uncertainties, (3) factors/processes that affect vertical profiles of radionuclide tracers, and/or (4) field studies in which unusual patterns have led to new insights in dating.
Primary Convener:  Judith Z Drexler, USGS California Water Science Center, Sacramento, United States
Conveners:  Christopher Fuller, USGS Western Regional Offices Menlo Park, Menlo Park, CA, United States and Mark M Baskaran, Wayne State University, Geology, Detroit, MI, United States
Chairs:  Judith Z Drexler, USGS California Water Science Center, Sacramento, United States, Christopher Fuller, USGS Western Regional Offices Menlo Park, Menlo Park, CA, United States and Mark M Baskaran, Wayne State University, Geology, Detroit, MI, United States
OSPA Liaison:  Judith Z Drexler, USGS California Water Science Center, Sacramento, United States
Co-Organized with:
Ocean Sciences, Hydrology, and Ocean Sciences

Cross-Listed:
  • GC - Global Environmental Change
  • H - Hydrology
  • OS - Ocean Sciences

Proposed Co-Organized Session with:
  • H - Hydrology
  • OS - Ocean Sciences
Index Terms:

0458 Limnology [BIOGEOSCIENCES]
0497 Wetlands [BIOGEOSCIENCES]
1115 Radioisotope geochronology [GEOCHRONOLOGY]
4863 Sedimentation [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]

Abstracts Submitted to this Session:

A brief review of 210Pb sediment dating models and uncertainties in a world of global change (Invited) (127846)
Joan-Albert Sanchez-Cabeza, National Autonomous University of Mexico, Ciudad DE Armería, Mexico and Ana Carolina Ruiz-Fernandez, National Autonomous University of Mexico, Institute of Marine Sciences and Limnology, Ciudad DE Armería, Mexico
Is 137Cs Dating Becoming Obsolete in North America? (131787)
Judith Z Drexler, USGS California Water Science Center, Sacramento, United States, Christopher Fuller, USGS Western Regional Offices Menlo Park, Menlo Park, CA, United States and Antonia Salas, USGS California Water Science Center Sacramento, Sacramento, CA, United States
A tale of two cores: Evaluation of 210Pb dating methods of salt marsh sediments for two cores collected 30 years apart (149096)
Christopher Fuller, USGS Western Regional Offices Menlo Park, Menlo Park, CA, United States and Judith Z Drexler, USGS California Water Science Center, Sacramento, United States
210Pb sediment dating in coastal transition zones: tropical saltmarshes. (180044)
Ana Carolina Ruiz-Fernandez1, Joan-Albert Sanchez-Cabeza2, Vladislav Carnero-Bravo2 and Libia-Hascibe Perez-Bernal1, (1)Universidad Nacional Autonoma de Mexico, Unidad Académica Mazatlán, Mexico City, Mexico, (2)Universidad Nacional Autonoma de Mexico, Mexico City, Mexico
Plutonium isotopes offer an alternative approach to establishing chronological profiles in coarse sediments (135715)
Christina R Pondell1, Steven A Kuehl2 and Elizabeth A Canuel2, (1)American University, Washington, DC, United States, (2)Virginia Institute of Marine Science, Gloucester Point, VA, United States
Quantity of dates trumps quality of dates for dense Bayesian radiocarbon sediment chronologies - Gas ion source 14C dating instructed by simultaneous Bayesian accumulation rate modeling (163945)
Brad E Rosenheim, University of South Florida, College of Marine Science, Saint Petersburg, United States, Devon Firesinger, University of South Florida St. Petersburg, St Petersburg, United States, Mark L Roberts, Woods Hole Oceanographic Inst, Woods Hole, MA, United States, Joshua R Burton, Woods Hole Oceanographic Institution, Geology and Geophysics, Woods Hole, MA, United States, Nicole Khan, United States Geologic Survey, Saint Petersburg Coastal and Marine Science Center, Saint Petersburg, FL, United States and Ryan P Moyer, Florida Fish and Wildlife Research Institute, St. Petersburg, FL, United States
Interpreting Beryllium-7 and Lead-210 fluxes and ratios for age dating fluvial sediments in Difficult Run Watershed, Virginia, USA (173538)
Diana L Karwan, University of Minnesota Twin Cities, Department of Forest Resources, Saint Paul, United States, James Eugene Pizzuto, University of Delaware, Dept. of Earth Sciences, Newark, DE, United States, Katherine Skalak, USGS Headquarters, Reston, VA, United States and Adam Benthem, U.S. Geological Survey, Pembroke, MA, United States
Improving 14C dating precision in dynamic, brackish waters by one order of magnitude: 87Sr/86Sr isotopes as a quantitative proxy for 14C reservoir age. (176341)
Bryan Lougheed1, Gareth Davies2, Helena L Filipsson3, Jeroen van der Lubbe4 and Ian Snowball1, (1)Uppsala University, Department of Earth Sciences, Uppsala, Sweden, (2)VU Amsterdam, Amsterdam, Netherlands, (3)Lund University, Department of Geology, Lund, Sweden, (4)VU University Amsterdam, Amsterdam, Netherlands
Modeling Peat Ages Using 7Be Data to Account for Downwash of 210Pb (179425)
Kristen Manies, US Geological Survey, Menlo Park, CA, United States, Christopher Fuller, USGS Western Regional Offices Menlo Park, Menlo Park, CA, United States and Miriam Jones, U.S. Geological Survey, Reston, United States
High-resolution age modelling of peat bog profiles using pre and post-bomb 14C, 210Pb and cryptotephra data from six Albertan peat bogs (195393)
Lauren J Davies1, Duane G Froese1, Peter Appleby2, Simon van Bellen3, Gabriel Magnan4, Gillian Mullan-Boudreau5, Tommy Noernberg5, William Shotyk5 and Claudio Zaccone6, (1)University of Alberta, Department of Earth and Atmospheric Sciences, Edmonton, AB, Canada, (2)University of Liverpool, Department of Mathematical Sciences, Liverpool, United Kingdom, (3)Université du Québec à Montréal, Geotop, Montreal, QC, Canada, (4)Université du Québec à Montréal UQAM, Département de géographie, Montreal, QC, Canada, (5)University of Alberta, Department of Renewable Resources, Edmonton, AB, Canada, (6)University of Foggia, Department of the Sciences of Agriculture, Food and Environment, Foggia, Italy
Assessment of Lead and Beryllium deposition and adsorption to exposed stream channel sediments (188575)
Ethan D. Pawlowski, University of Minnesota Twin Cities, Forest Resources, Minneapolis, MN, United States and Diana L Karwan, University of Minnesota Twin Cities, Department of Forest Resources, Saint Paul, United States

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