CT42A:
Biogeochemical cycles in oxygen minimum zones: mechanisms, drivers, and change I

Session ID#: 92755

Session Description:
Oxygen minimum zones in the coastal and open ocean are spatially expanding and intensifying, with model projections showing continued O2 loss in the future. These regions play a fundamental role in the biogeochemical cycles of elements such as carbon, nitrogen and sulfur as well as trace elements, host microbial communities with diverse metabolic pathways, and act as significant sources and sinks of nutrients and climatically relevant (greenhouse) gases. Yet, significant questions on the nature, drivers and variability of these processes remain. This session aims to build a comprehensive view of oxygen minimum zone biogeochemistry, by inviting researchers who apply a variety of approaches to these problems, from field and laboratory measurements, to -omics based studies, to observational synthesis and numerical models. Specifically, we invite submissions investigating: (1) the distribution, speciation and transformation of macronutrients (N, P, Si), trace metals (e.g. Mn, Fe, Co, Ni, Cu, Zn, Cd), redox-active elements (e.g. S, Cr, Mo, I) and their isotopes; (2) microbial interactions and their impacts on biogeochemical cycles; (3) processes occurring in and around particle-associated microenvironments, and (4) the physical drivers and variability of these processes. Studies assessing regional or global impacts with large/new datasets, e.g. from international programs such as GEOTRACES, and integrative approaches combining modeling, field/laboratory measurements, and/or microbial and molecular approaches are especially encouraged.
Co-Sponsor(s):
  • OB - Ocean Biology and Biogeochemistry
Index Terms:

4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: CHEMICAL]
4851 Oxidation/reduction reactions [OCEANOGRAPHY: CHEMICAL]
4870 Stable isotopes [OCEANOGRAPHY: CHEMICAL]
4875 Trace elements [OCEANOGRAPHY: CHEMICAL]
Primary Chair:  David Janssen, University of Bern, Institute of Geological Sciences & Oeschger Center for Climate Change Research, Bern, Switzerland
Co-chairs:  Daniele Bianchi, University of California Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, CA, United States and Thomas S Weber, University of Rochester, Department of Earth and Environmental Sciences, Rochester, United States
Primary Liaison:  David Janssen, University of Bern, Institute of Geological Sciences & Oeschger Center for Climate Change Research, Bern, Switzerland
Moderators:  David Janssen, University of Bern, Institute of Geological Sciences & Oeschger Center for Climate Change Research, Bern, Switzerland and Thomas S Weber, University of Rochester, Department of Earth and Environmental Sciences, Rochester, United States
Student Paper Review Liaisons:  Thomas S Weber, University of Rochester, Department of Earth and Environmental Sciences, Rochester, United States and David Janssen, University of Bern, Institute of Geological Sciences & Oeschger Center for Climate Change Research, Bern, Switzerland

Abstracts Submitted to this Session:

CT42A-01
Constraints on marine ODZ iodine cycling and implications for paleoredox proxy applications (642067)
Dalton Hardisty1, Rintaro Moriyasu2, Natalya Evans2, Tristan J Horner3, Andrew R Babbin4, Scott D. Wankel5, James W Moffett6 and Sune Nielsen7, (1)Michigan State University, Department of Earth and Environmental Sciences, East Lansing, MI, United States, (2)University of Southern California, Los Angeles, United States, (3)Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, United States, (4)Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, United States, (5)Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, MA, United States, (6)University of Southern California, Los Angeles, CA, United States, (7)Woods Hole Oceanographic Institute, Geology & Geophysics, Woods Hole, United States
CT42A-02
Sediments in Low Oxygen Environments as a Potential Source of Iron to the Water Column: The Role of Iron Redox Cycling and Sediment Resuspension (642404)
David Burdige, Old Dominion University, Dept. of Ocean, Earth and Atmospheric Sciences, Norfolk, VA, United States and Tomoko Komada, San Francisco State Univ, Estuary & Ocean Science Center, Tiburon, United States
CT42A-03
Organic Complexation of Iron in the Eastern Tropical North Pacific Oxygen Deficient Zone (647524)
Laura Moore1, Maija Iris Heller2, James W Moffett3 and Randelle M Bundy1, (1)University of Washington Seattle Campus, School of Oceanography, Seattle, United States, (2)Pontificia Universidad Católica de Valparaíso Chile, Escuela de Ciencias del Mar, Valparaiso, Chile, (3)University of Southern California, Los Angeles, CA, United States
CT42A-04
Particle size and abundance measurements suggest decreased particle attenuation and disaggregation in the Eastern Tropical North Pacific Oxygen Minimum Zone (653487)
Jacob Adrian Cram1, Jessica Pretty2, Clara A Fuchsman1, Rachel Marie Lekanoff3, Jaqui Neibauer4, Megan E Duffy4, Richard G Keil4 and Andrew M. P. McDonnell3, (1)University of Maryland Center for Environmental Science Horn Point Laboratory, Cambridge, United States, (2)Prince William Sound Science Center, Cordova, United States, (3)University of Alaska Fairbanks, Fairbanks, United States, (4)University of Washington, School of Oceanography, Seattle, WA, United States
CT42A-05
High-resolution marine flux measurements, in situ respiration rate determinations, and meta-omic surveys of sinking particulate matter in the ocean’s three primary oxygen deficient zones (655801)
Jaqui Neibauer1, Megan E Duffy1, Clara A Fuchsman2, Khadijah K. Homolka3, Emmet Bush1, Jamee Adams4, Wendi Ruef1, Allan Devol1 and Richard G Keil1, (1)University of Washington, School of Oceanography, Seattle, WA, United States, (2)University of Maryland Center for Environmental Science Horn Point Laboratory, Cambridge, MD, United States, (3)University of Washington, School of Oceanography, Seattle, United States, (4)Scripps Institution of Oceanography, La Jolla, United States
CT42A-06
Determining Rates of Hybrid Archaeal N2O Production in the Eastern Tropical North Pacific Ocean with Intramolecular Isotope Measurements (643939)
Colette LaMonica Kelly, Stanford University, Stanford, United States, Nicole Mayu Travis, Stanford University, Earth Systems Science, Stanford, CA, United States, Pascale Anabelle Baya, Géosciences Environnement Toulouse (GET), UMR CNRS / IRD / Université Paul Sabatier, Toulouse, France, Claudia Frey, University of Basel, Basel, Switzerland, Bess B Ward, Princeton University, Department of Geosciences, Princeton, NJ, United States and Karen L Casciotti, Stanford University, Oceans Department, Stanford, United States
CT42A-07
Small scale oxygen heterogeneity enhances nitrogen cycling and nitrous oxide production in oxygen minimum zones (648303)
Daniele Bianchi, University of California Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, CA, United States and Simon Yang, University of California Los Angeles, Atmospheric and Oceanic Sciences, Los Angeles, United States
CT42A-08
Spatio-temporal heterogeneity in marine nitrous oxide emissions of the South Pacific (642073)
Andrew R Babbin, Massachusetts Institute of Technology, EAPS, Cambridge, United States and Elisabeth Boles, Stanford University, Civil and Environmental Engineering, Stanford, United States
See more of: Chemical Tracers, Organic Matter and Trace Elements