BN020:
The Impact of Global Environmental Change on Biogeochemical Processes in Marine Sediments


Session ID#: 22942

Session Description:
Global environmental change is driving the ocean into a warmer, more acidic and less well oxygenated state with consequences for biogeochemical processes at the seafloor and beyond. Ocean deoxygenation enhances the mobility of phosphorous, iron and other micronutrients in marine sediment. Increasing sedimentary nutrient release along with an increase in reductive nitrogen loss in the water column may stimulate nitrogen fixation, primary productivity and further respiratory oxygen consumption in a positive feedback loop. Seafloor warming at higher latitudes may cause methane hydrate deposits at the seafloor to dissociate thus leading to enhanced greenhouse gas release into the ocean and possibly the atmosphere. Such feedback mechanisms between environmental change and sedimentary processes have modulated biogeochemical cycling in the ocean through Earth’s history, including relatively short-lived periods such as late Quaternary deglaciations and Ocean Anoxic Events. Proxy reconstructions of benthic biogeochemical processes in the geological past may help us the predict ocean biogeochemical dynamics in the future. In this session, we invite contributions that address how biogeochemical processes at the seafloor are affected by global environmental change. Studies focusing on different spatial (regional to global) and temporal (past, present, future) scales as well as applying observational and modeling approaches are invited.
Primary Chair:  Florian Scholz, Geomar Helmholtz Center for Ocean Research Kiel, Kiel, Germany
Co-Chair:  Christian März, University of Leeds, School of Earth and Environment, Leeds, United Kingdom
Index Terms:

1615 Biogeochemical cycles, processes, and modeling [GLOBAL CHANGE]
4802 Anoxic environments [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4845 Nutrients and nutrient cycling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4875 Trace elements [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Cross-Topics:
  • BE - Benthic Ecosystems
    *Use ME: Marine Ecosystems*
  • MG - Marine Geology and Sedimentology
  • OC - Ocean Change: Acidification and Hypoxia
  • PC - Past, Present and Future Climate

Abstracts Submitted to this Session:

Logan Ashley Tegler1,2, Ann G Dunlea2, Stephen J Romaniello3, Ariel D Anbar1,3 and Tristan J Horner2, (1)Arizona State University, School of Molecular Sciences, Tempe, AZ, United States, (2)NIRVANA Laboratories, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (3)Arizona State University, School of Earth & Space Exploration, Tempe, AZ, United States
Amy Marie Kuzminov1, Silke Severmann1 and Caroline P Slomp2, (1)Rutgers University, New Brunswick, NJ, United States, (2)Utrecht University, Utrecht, 3584, Netherlands
Chloe Lynn Ann Smith, Oregon Institute of Technology, Klamath Falls, OR, United States, Heili E Lowman, University of California, Santa Barbara, Ecology, Evolution, and Marine Biology, Santa Barbara, CA, United States and John M Melack, Univ California Santa Barbara, Santa Barbara, CA, United States
Florian Scholz, Matthias Baum, Christopher Siebert, Andrew Dale and Stefan Sommer, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
William Alexander Nesbitt and Alfonso Mucci, McGill University, Department of Earth and Planetary Sciences, Montreal, QC, Canada
Tina Treude1,2, Sydnie Lemieux2, Elizabeth Petsios3, Jeana Drake1,4 and William Berelson5, (1)University of California Los Angeles, Department of Earth, Planetary and Space Sciences, Los Angeles, CA, United States, (2)University of California Los Angeles, Department of Atmospheric and Oceanic Sciences, Los Angeles, CA, United States, (3)University of Southern California, Los Angeles, CA, United States, (4)University of California Los Angeles, Department of Ecology and Evolutionary Biology, Los Angeles, CA, United States, (5)University of Southern California, Claremont, CA, United States