CT43A:
The Biogeochemistry of Dissolved Organic Matter (DOM) I


Session ID#: 11301

Session Description:
Dissolved organic matter (DOM) plays a major role for biogeochemical cycles in the ocean and on land. DOM contains as much carbon as all living biomass on the continents and oceans combined, and a similar amount of carbon as atmospheric CO2. Due to its great size, even minor changes in the DOM pool will impact global biogeochemical cycles and the heat budget of the Earth. The accumulation of DOM in the ocean over several millennia is enigmatic and contradicts established paradigms in geochemistry for organic matter stabilization. On the other hand, bacteria can only assimilate dissolved molecules, and DOM is therefore the main mediator for the flux of energy in the ocean and freshwater ecosystems. The DOM pool is now recognized as paralleling the sedimentary record as an information-rich set of tracers. These molecules carry the signatures of their source and subsequent journey through the environment. For this session we invite contributions from all areas of research on DOM biogeochemistry. Molecular-level studies and interdisciplinary studies that link microbiological or abiotic processes to DOM cycling are particularly welcome. Also contributions that identify novel concepts, fundamental challenges, and the future directions of this fast growing field of research are encouraged.
Primary Chair:  Thorsten Dittmar, Carl von Ossietzky University Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Oldenburg, Germany; University of Oldenburg, ICBM-MPI Bridging Group for Marine Geochemistry, Institute for Chemistry and Biology of the Marine Environment, Oldenburg, Germany
Chairs:  Thorsten Dittmar1,2, Helena Osterholz3,4, Aron Stubbins5, Sasha Wagner6, Jutta Niggemann3,7, Alison Buchan8, Rob Fatland9 and Daniel Repeta10, (1)University of Oldenburg, ICBM-MPI Bridging Group for Marine Geochemistry, Institute for Chemistry and Biology of the Marine Environment, Oldenburg, Germany(2)Carl von Ossietzky University Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Oldenburg, Germany(3)University of Oldenburg, Oldenburg, Germany(4)Max Planck Institute for Marine Microbiology, Bremen, Germany(5)Skidaway Institute of Oceanography, University of Georgia, Savannah, GA, United States(6)Skidaway Institute of Oceanography, Savannah, GA, United States(7)University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Oldenburg, Germany(8)University of Tennessee, Department of Microbiology, Knoxville, TN, United States(9)Microsoft Corporation, Redmond, WA, United States(10)Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States
Moderators:  Helena Osterholz, University of Oldenburg, Oldenburg, Germany; Max Planck Institute for Marine Microbiology, Bremen, Germany, Sasha Wagner, Skidaway Institute of Oceanography, Savannah, GA, United States and Aron Stubbins, Skidaway Institute of Oceanography, University of Georgia, Savannah, GA, United States
Student Paper Review Liaisons:  Sasha Wagner, Skidaway Institute of Oceanography, Savannah, GA, United States and Helena Osterholz, Max Planck Institute for Marine Microbiology, Bremen, Germany
Index Terms:

4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4825 Geochemistry [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4840 Microbiology and microbial ecology [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4850 Marine organic chemistry [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Co-Sponsor(s):
  • B - Biogeochemistry and Nutrients
  • EC - Estuarine and Coastal
  • MM - Microbiology and Molecular Biology
  • PP - Phytoplankton and Primary Production

Abstracts Submitted to this Session:

CT43A-01
Structuring of bacterial communities by phytoplankton and DOM in the Delaware estuary (88972)
David Kirchman1, Giacomo R DiTullio2, Helena Osterholz3, Jutta Niggemann3 and Thorsten Dittmar4, (1)University of Delaware, School of Marine Science and Policy, Lewes, DE, United States, (2)College of Charleston, Department of Biology, Charleston, SC, United States, (3)University of Oldenburg, Oldenburg, Germany, (4)University of Oldenburg, ICBM-MPI Bridging Group for Marine Geochemistry, Institute for Chemistry and Biology of the Marine Environment, Oldenburg, Germany
CT43A-02
Molecular Transformations of Dissolved Organic Matter in the Lower Amazon River (90875)
Michael Seidel1,2, Thorsten Dittmar1, Nicholas D Ward3, Alex V Krusche4, Jeffrey E Richey5, Patricia L Yager2 and Patricia M Medeiros2, (1)University of Oldenburg, Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Oldenburg, Germany, (2)University of Georgia, Department of Marine Sciences, Athens, GA, United States, (3)University of Florida, Geological Sciences, Ft Walton Beach, WA, United States, (4)CENA Center for Nuclear Energy in Agriculture, Piracicaba, Brazil, (5)University of Washington Seattle Campus, Seattle, WA, United States
CT43A-03
The fate of terrestrial dissolved organic matter in the Eurasian basin of the Arctic Ocean (92899)
Karl Kaiser, Texas A&M University at Galveston, Marine Sciences, Galveston, TX, United States, Ronald H Benner, University of South Carolina Columbia, Marine Sciences, Columbia, SC, United States and Rainer M W Amon, Texas A & M University at Galveston, Galveston, TX, United States
CT43A-04
Rivers and nitrate control DOC distribution in the upper Atlantic Ocean (92380)
Cristina Romera-Castillo1, Robert T Letscher2 and Dennis A Hansell1, (1)RSMAS, University of Miami, Ocean Sciences Department, Miami, FL, United States, (2)University of New Hampshire, Earth Sciences, Durham, NH, United States
CT43A-05
Sources and Cycling of Dissolved Organic Carbon in the Gulf of Mexico: Insights from Stable (δ13C) and Radiocarbon (Δ14C) Signatures (93202)
Brett D Walker1, Ellen R M Druffel1, Sheila Griffin2, Joanna Kolasinski3, Brian J Roberts4, Xiaomei Xu2, Frank E Muller-Karger5 and Brad E Rosenheim6, (1)University of California Irvine, Earth System Science, Irvine, CA, United States, (2)University of California Irvine, Irvine, CA, United States, (3)Université de La Réunion, UMR ENTROPIE, La Réunion, France, (4)Louisiana Universities Marine Consortium, Chauvin, LA, United States, (5)University of South Florida, IMaRS, St Petersburg, FL, United States, (6)University of South Florida St. Petersburg, College of Marine Science, St Petersburg, FL, United States
CT43A-06
Targeted Isolation of Refractory and Semi-Labile DOM for Detailed Molecular Study: First Results from the Central North Pacific Subtropical Gyre. (90464)
Taylor Broek1, Thomas P Guilderson2, Amy Lynn Bour3, Yasuhiko T Yamaguchi4 and Matthew McCarthy1, (1)University of California Santa Cruz, Ocean Sciences Department, Santa Cruz, CA, United States, (2)Lawrence Livermore National Laboratory, Livermore, CA, United States, (3)University of California Santa Cruz, Santa Cruz, CA, United States, (4)The University of Tokyo, Santa Cruz, CA, United States
CT44A-0212
The molecular geography of dissolved organic matter in the Atlantic Ocean can largely be explained by a simple two-source mixing model. (91182)
Maren Seibt, University of Oldenburg, Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Institute for Chemistry and Biology of the Marine Environment, Oldenburg, Germany, Jutta Niggemann, University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), Oldenburg, Germany, Helena Osterholz, Max Planck Institute for Marine Microbiology, Bremen, Germany and Thorsten Dittmar, Carl von Ossietzky University Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Oldenburg, Germany
CT43A-08
Cycling of marine dissolved organic carbon: New insights from radiocarbon distribution within carboxylic-rich alicyclic molecules and acylated heteropolysaccharides (92957)
Prosper Zigah1, Steven R Beaupre2, Daniel Repeta3, Ann P McNichol1, Li Xu4 and Lihini Aluwihare5, (1)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (2)Stony Brook University, School of Marine and Atmospheric Sciences, Stony Brook, NY, United States, (3)Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, MA, United States, (4)University of Saskatchewan, Global Institute for Water Security, Saskatoon, SK, Canada, (5)Scripps Institution of Oceanography, La Jolla, CA
See more of: Chemical Tracers, DOM and Trace Metals