AI007:
Ocean Carbon Hot Spots: Biogeochemical cycling and anthropogenic carbon export in mode and intermediate water formation regions


Session ID#: 28560

Session Description:
Western boundary current (WBC) and mid-latitude regions where mode and intermediate waters form coincide with the largest annual mean air-to-sea exchanges of carbon dioxide gas and elevated anthropogenic carbon inventories. However, anthropogenic carbon uptake in low-latitude waters prior to their poleward transport in WBCs is thought to contribute more to anthropogenic carbon export at the site of mode water subduction than local air-sea gas exchange – indicating an important upstream carbon source. Additionally, WBCs exhibit enhanced natural carbon cycling where eddy activity increases nutrient supply, biological activity, and the active transport of particles. Previous studies indicate that oscillations in eddy activity can be modulated by, and feedback on, large-scale climate dynamics, and have been shown to influence mode water formation rates, volumes, and biogeochemical properties. This signifies an important source of interannual variability in anthropogenic carbon inventories and natural carbon cycling in these regions. The hemispheric to submesoscale physical mechanisms driving carbon into the ocean interior in these locations makes it challenging to disentangle natural and anthropogenic biogeochemical cycles and their interactions. Presentations to reveal either physical or biogeochemical processes that can contribute to these mechanisms, based on in situ and remote observations, as well as numerical models, are invited.
Primary Chair:  Andrea J Fassbender, Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States
Co-chairs:  Stuart Bishop, North Carolina State University, NC, United States, Dongxiao Zhang, JISAO/University of Washington and NOAA/PMEL, Seattle, WA, United States and Jaime B Palter, University of Rhode Island, Kingston, RI, United States
Index Terms:

4504 Air/sea interactions [OCEANOGRAPHY: PHYSICAL]
4520 Eddies and mesoscale processes [OCEANOGRAPHY: PHYSICAL]
4576 Western boundary currents [OCEANOGRAPHY: PHYSICAL]
4806 Carbon cycling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Cross-Topics:
  • BN - Biogeochemistry and Nutrients
  • OC - Ocean Change: Acidification and Hypoxia
  • PL - Physical Oceanography: Mesoscale and Larger
  • PS - Physical Oceanography: Mesoscale and Smaller

Abstracts Submitted to this Session:

Makio Honda, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan, Yoshikazu Sasai, JAMSTEC, Yokohama, Japan, Eko Siswanto, JAMSTEC, Japan, Akira Kuwano-Yoshida, Kyoto University, Disaster Protection Research Institution, Shirahama, Japan and Meghan Cronin, NOAA Pacific Marine Environmental Laboratory, Seattle, WA, United States
Andrea J Fassbender, Monterey Bay Aquarium Research Institute, Moss Landing, CA, United States, Keith B Rodgers, Princeton University, Princeton, NJ, United States, Hilary I Palevsky, Woods Hole Oceanographic Institution, Woods Hole, MA, United States and Christopher L Sabine, NOAA Pacific Marine Environmental Laboratory, Seattle, WA, United States
Benjamin K Johnson, North Carolina State University, Marine, Earth, and Atmospheric Sciences, Raleigh, NC, United States, Jeffrey Willison, North Carolina State University Raleigh, Marine, Earth, and Atmospheric Sciences, Raleigh, NC, United States and Ruoying He, NC State University, Raleigh, NC, United States