AH43A:
Nutrient-Enhanced Coastal Acidification and Hypoxia and Other Anthropogenic Impacts on Biogeochemical Processes IV


Session ID#: 11404

Session Description:
Excessive nutrients often cause hypoxia through enhanced phytoplankton production of organic matter that is exported to the bottom and consumed by microbial respiration. The released CO2 during respiration further reduces the pH of already acidified water due to atmospheric CO2 in a way that is more than additive.  This is a concern due to the deleterious effects of low pH and O2 on marine life.  Yet, factors regulating coastal acidification are not fully understood due to the complexity of coastal systems.  One complication is caused by benthic respiration which reduces O2 and pH, but also generates alkalinity, which buffers against rapid changes in pH.  The oxidation of reduced species could also reduce pH near the oxic-anoxic boundary.  These and other biogeochemical processes, along with stratification and end-member mixing influence the occurrence and location of ecologically relevant combinations of low pH and O2. However, the uncertainties around these processes make the effectiveness of management efforts aimed at nutrient reductions to reduce coastal acidification difficult to predict.  This session invites presentations describing observations and models that further understanding of and improve our ability to predict how nutrients and other anthropogenic impacts contribute to coastal acidification and hypoxia and ecosystem changes.
Primary Chair:  John C Lehrter, US EPA, Gulf Breeze, FL, United States
Chairs:  Wei-Jun Cai, University of Delaware, School of Marine Science and Policy, Newark, DE, United States, Jason S Grear, US EPA, Narragansett, RI, United States, Cheryl Ann Brown, US EPA, Newport, OR, United States, Richard B Rivkin, Memorial University of Newfoundland, St John's, NL, Canada, M Robin Anderson, Fisheries and Oceans Canada, Tt. John's, NF, Canada, Louis Legendre, Université Pierre et Marie Curie, Paris, France and Nianzhi Jiao, Xiamen University, Institute of marine microbes and ecosphere, Xiamen, China
Moderators:  Louis Legendre, Université Pierre et Marie Curie, Paris, France, Cheryl Ann Brown, US EPA, Newport, OR, United States, Nianzhi Jiao, Xiamen University, Institute of marine microbes and ecosphere, Xiamen, China and John Lehrter, US EPA, Gulf Breeze, FL, United States
Student Paper Review Liaisons:  Wei-Jun Cai, University of Delaware, Newark, DE, United States and Richard B Rivkin, Memorial University of Newfoundland, St John's, NL, Canada
Index Terms:

4273 Physical and biogeochemical interactions [OCEANOGRAPHY: GENERAL]
4805 Biogeochemical cycles, processes, and modeling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4834 Hypoxic environments [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
4845 Nutrients and nutrient cycling [OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL]
Co-Sponsor(s):
  • EC - Estuarine and Coastal
  • HI - Human Use and Impacts

Abstracts Submitted to this Session:

AH43A-01
Anthropogenic Effects on Ecosystem Services as Mediated by Ocean Biogeochemical Processes (88022)
Richard B Rivkin, Memorial University of Newfoundland, St John's, NL, Canada, M Robin Anderson, Fisheries and Oceans Canada, Environmental Science Division, St. John's, NF, Canada and Louis Legendre, Université Pierre et Marie Curie, Paris, France
AH44A-0070
Modeling the Effects of Hypoxia on Fish Movement in the Gulf of Mexico Hypoxic Zone (88989)
Elizabeth LaBone1, Dubravko Justic1, Kenneth Rose1, Lixia Wang1 and Haosheng Huang2, (1)Louisiana State University, Oceanography and Coastal Sciences, Baton Rouge, LA, United States, (2)Louisiana State University, Baton Rouge, LA, United States
AH43A-03
Elevated pCO2 Decreases the Role of DOC in Vertical Export (90091)
Anna James1, Craig A Carlson2, Uta Passow1, Mark A Brzezinski3, Rachel Jane Parsons4 and Jennifer N Trapani4, (1)University of California at Santa Barbara, Marine Science, Santa Barbara, CA, United States, (2)University of California Santa Barbara, Marine Science Institute/Department of Ecology, Evolution and Marine Biology, Santa Barbara, CA, United States, (3)University of California Santa Barbara, Santa Barbara, CA, United States, (4)Bermuda Institute for Ocean Sciences, BIOS, St. George's, Bermuda
AH43A-05
Determination of the Anthropogenic Carbon Signal to the Total Change in Dissolved Carbon in the Coastal Upwelling Region Along the Washington-Oregon-California Continental Margin (89162)
Richard A Feely, NOAA Pacific Marine Environmental Laboratory, Seattle, WA, United States
AH43A-06
Acidification at the oxic-anoxic boundary in Chesapeake Bay waters (88856)
Wei-Jun Cai, University of Delaware, School of Marine Science and Policy, Newark, DE, United States
AH43A-07
Exploring Effects of Hypoxia on Fish and Fisheries in the Northern Gulf of Mexico using a Dynamic Spatially-Explicit Ecosystem Model (88841)
Kim de Mutsert1, Jeroen Steenbeek2, Kristy Lewis1, Joe Buszowski2, James H Cowan Jr.3 and Villy Christensen4, (1)George Mason University, Environmental Science and Policy, Fairfax, VA, United States, (2)Ecopath International Initiative, Barcelona, Spain, (3)Louisiana State University, Oceanography & Coastal Sciences, Baton Rouge, LA, United States, (4)University of British Columbia, Fisheries Centre, Vancouver, BC, Canada
AH43A-08
Modeling the population-level effects of hypoxia on a coastal fish: implications of a spatially-explicit individual-based model (93881)
Kenneth Rose1, Sean Creekmore1, Peter Thomas2, Kevin Craig3, Rachael Neilan4, Saydur Rahman5, Lixia Wang1 and Dubravko Justic1, (1)Louisiana State University, Oceanography and Coastal Sciences, Baton Rouge, LA, United States, (2)University of Texas at Austin, Marine Science Institute, Port Aransas, TX, United States, (3)NOAA, Southeast Fisheries Science Center, Beaufort, NC, United States, (4)Duquesne University, Department of Mathematics and Computer Science, Pittsburgh, PA, United States, (5)University of Texas Rio Grande Valley, Department of Biology, Brownsville, TX, United States
See more of: Ocean Change: Acidification and Hypoxia