OB019
New insights on net community production and biogenic carbon export in the Southern Ocean
Session ID#: 84431
Session Description:
The Southern Ocean plays a significant role in the global carbon cycle, through a balance between the ventilation of old, carbon-rich waters, solubility-driven uptake as subtropical waters move south, and carbon fixation by the Southern Ocean biota. Net Community Production (NCP), defined as the net production of organic carbon after accounting for the respiration needs of the local ecosystem, represents the amount of organic carbon available for export out of the surface into the deep ocean and sediments. Southern Ocean NCP accounts for about 30 % of the global carbon export, and its variability can exert an important control on the carbon exchange between the global ocean and the atmosphere, as well as the supply of nutrients into the subtropical ocean. Presently, the overall spatial and temporal variability of Southern Ocean NCP is not well understood. Furthermore, the mechanisms controlling its magnitude and role in determining the air-sea flux of CO
2 in the Southern Ocean are not well defined. We invite contributions to investigate the overarching processes controlling NCP in the Southern Ocean, including the subtropical regions of the Southern Hemisphere, using observational (local or remote sensing) as well as modelling-based approaches. Specifically, we aim to address the following topics:
- Quantification of NCP magnitude in the Southern Ocean
- Environmental processes that control NCP in the Southern Ocean
- The role of biological carbon export in net annual and seasonal air-sea CO2 fluxes in this region
- Sensitivities and future projections of NCP/carbon export in the Southern Ocean.
Index Terms:
4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: CHEMICAL]
4806 Carbon cycling [OCEANOGRAPHY: BIOLOGICAL]
4815 Ecosystems, structure, dynamics, and modeling [OCEANOGRAPHY: BIOLOGICAL]
4855 Phytoplankton [OCEANOGRAPHY: BIOLOGICAL]
Primary Chair: Lionel Arteaga, Princeton University, Princeton, NJ, United States
Co-chairs: Haidi Chen, Princeton University, Princeton, NJ, United States and Seth M Bushinsky, University of Hawaii at Manoa, Marine Sciences Building, Honolulu, HI, United States
Primary Liaison: Lionel Arteaga, Princeton University, Princeton, NJ, United States
Autonomous Biogeochemical Floats Link Huge Southern Ocean Phytoplankton Bloom to Maud Rise Polynya (641086)
Lauren von Berg1, Channing Prend2, Ethan C Campbell3, Matthew R Mazloff2, Lynne D Talley2 and Sarah T Gille2,4, (1)Princeton University, Princeton, NJ, United States, (2)Scripps Institution of Oceanography, La Jolla, CA, United States, (3)University of Washington, School of Oceanography, Seattle, WA, United States, (4)UCSD, La Jolla, CA, United States
Processes Driving Carbon and Oxygen Fluxes in the High Latitude Southern Ocean Determined from Biogeochemical-Argo Floats (643674)
Jade Sauve1, Alison R Gray2, Stephen Riser2 and Seth M Bushinsky3, (1)University of Washington Seattle Campus, School of Oceanography, Seattle, WA, United States, (2)University of Washington, School of Oceanography, Seattle, WA, United States, (3)University of Washington, Seattle, WA, United States
‘We still say that NASA satellite algorithms under-estimate chlorophyll in the Southern Ocean’ (644561)
Robert Johnson1, Kimberlee Baldry2, Guillaume Liniger2 and Peter G Strutton3, (1)University of Tasmania, Institute for Marine and Antarctic Studies, Hobart, TAS, Australia, (2)University of Tasmania, Institute for Marine and Antarctic Studies (IMAS), Hobart, TAS, Australia, (3)Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia
On the role of phytoplankton community structure for Southern Ocean carbon export and air-sea CO2 exchange – a model assessment (645621)
Cara Nissen, ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, Zurich, Switzerland, Nicolas Gruber, ETH Zurich, Environmental Physics, Zurich, Switzerland, Meike Vogt, ETH Zurich, Environmental Systems Science, Zurich, Switzerland and Matthias Munnich, ETH Zurich, Environmental Systems Science, Switzerland
Synoptic-scale Weather Imprints on Upper-Ocean Physics and Phytoplankton Blooms in the Southern Ocean (648259)
Magdalena M Carranza, National Center for Atmospheric Research, Boulder, CO, United States, Ivy Frenger, ETH Zurich, Zurich, Switzerland, Alejandro Di Luca, University of New South Wales, Sydney, NSW, Australia, Matthew C Long, National Center for Atm Res, Boulder, CO, United States, Colin M. Zarzycki, National Center for Atmospheric Research, Climate and Global Dynamics Laboratory, Boulder, CO, United States, Riley Xavier Brady, University of Colorado at Boulder, Department of Atmospheric and Oceanic Sciences, Boulder, CO, United States and Daniel B Whitt, NCAR, CO, United States
Zonal asymmetries in Southern Ocean primary productivity and carbon uptake (653385)
Channing Prend1, Alison R Gray2, Takaya Uchida3, Isabella Rosso1, Sarah T Gille4 and Lynne D Talley5, (1)Scripps Institution of Oceanography, La Jolla, CA, United States, (2)University of Washington, School of Oceanography, Seattle, WA, United States, (3)Columbia University of New York, Palisades, NY, United States, (4)UCSD, La Jolla, CA, United States, (5)University of California San Diego, La Jolla, CA, United States
Quantifying Particulate Organic Carbon Concentrations and Flux in the Southwestern Ross Sea Using Autonomous Glider Data (653952)
Meredith Meyer1, Walker O Smith Jr2 and Randolph Michael Jones1, (1)Virginia Institute of Marine Science, Biological Sciences, Gloucester Point, VA, United States, (2)Virginia Inst Marine Sciences, Gloucester Point, VA, United States
Southern Ocean annual net community production using combined biogeochemical mass balances on profiling floats (655140)
Seth M Bushinsky, University of Hawaii at Manoa, Marine Sciences Building, Honolulu, HI, United States, Lionel Arteaga, Princeton University, Princeton, NJ, United States, Alison R Gray, University of Washington, School of Oceanography, Seattle, WA, United States and Jorge L Sarmiento, Princeton University, Atmospheric and Oceanic Sciences Program, Princeton, NJ, United States
