AH41A:
Nutrient-Enhanced Coastal Acidification and Hypoxia and Other Anthropogenic Impacts on Biogeochemical Processes III


Session ID#: 11403

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:  Cheryl Ann Brown, US EPA, Newport, OR, United States, M Robin Anderson, Fisheries and Oceans Canada, St. John's, NF, Canada, Jason Grear, US EPA, Narragansett, RI, United States and Louis Legendre, Université Pierre et Marie Curie, Paris, France
Student Paper Review Liaisons:  Richard B Rivkin, Memorial University of Newfoundland, St John's, NL, Canada and John Lehrter, US EPA, Gulf Breeze, FL, United States
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:

AH41A-01
Ecosystem Modeling of Coastal Acidification and Hypoxia and Structural Uncertainties in the Representation of Sediment-Water Exchanges (91307)
John C Lehrter1, Lisa Lowe2, Dong S Ko3, Arnaud Laurent4, Katja Fennel5, Dubravko Justic6, Lixia Wang6, James J Pauer7, Brandon Jarvis8, David L Beddick Jr.8, Richard Devereux9 and Wei-Jun Cai10, (1)Environmental Protection Agency Gulf Breeze, Gulf Breeze, FL, United States, (2)CSRA, Research Triangle Park, NC, United States, (3)Naval Research Laboratory, Stennis Space Center, MS, United States, (4)Dalhousie University, Halifax, NS, Canada, (5)Dalhousie University, Department of Oceanography, Halifax, NS, Canada, (6)Louisiana State University, Oceanography and Coastal Sciences, Baton Rouge, LA, United States, (7)US Environmental Protection Agency, ORD/NHEERL/MED, Grosse Ile, MI, United States, (8)US EPA, Gulf Breeze, FL, United States, (9)US Environmental Protection Agency Research Triangle Park, Durham, NC, United States, (10)University of Delaware, School of Marine Science and Policy, Newark, DE, United States
AH41A-02
Changes in Chesapeake Bay Hypoxia over the Past Century (92636)
Marjorie A. M. Friedrichs1, Daniel Edward Kaufman1, Raymond Najjar2, Hanqin Tian3, Bowen Zhang4 and Yuanzhi Yao5, (1)Virginia Institute of Marine Science, Gloucester Point, VA, United States, (2)The Pennsylvania State University, Meteorology and Atmospheric Science, University Park, PA, United States, (3)Auburn University, International Center for Climate and Global Change Research and School of Forestry and Wildlife Sciences, Auburn, AL, United States, (4)Auburn University, International Center for Climate and Global Change Research & School of Forestry and Wildlife Sciences, Auburn, AL, United States, (5)Auburn Univ, Auburn, AL, United States
AH41A-03
Challenges associated with modeling low-oxygen waters in Chesapeake Bay: a multiple model comparison (88540)
Ike Irby1, Marjorie A. M. Friedrichs1, Carl T Friedrichs1, Aaron J Bever2, Raleigh R Hood3, Lyon W Lanerolle4, Malcolm E Scully5, Kevin Sellner6, Jian Shen1, Jeremy M Testa7, Ming Li8, Hao Wang9, Ping Wang10, Lewis Linker11 and Meng Xia12, (1)Virginia Institute of Marine Science, Gloucester Point, VA, United States, (2)Anchor QEA, San Francisco, CA, United States, (3)University of Maryland Center for Environmental Science Horn Point Laboratory, Cambridge, MD, United States, (4)NOAA NOS/OCS/CSDL/MMAP, Silver Spring, MD, United States, (5)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (6)Chesapeake Research Consortium, (7)University of Maryland Center for Environmental Science, Chesapeake Biological Laboratory, Solomons, MD, United States, (8)University of Maryland Center for Environmental Science Appalachian Laboratory, Frostburg, MD, United States, (9)Horn Point Laboratory, UMCES, Cambridge, MD, United States, (10)VIMS/CBPO, Annapolis, MD, United States, (11)US EPA Chesapeake Bay Program Office, 410 Severn Avenue, Annapolis, MD, United States, (12)Univ of MD, Eastern Shore, Princess Anne, MD, United States
AH41A-04
Diatom bloom derived summer bottom water hypoxia off the Changjiang Estuary and its variation (93508)
Bin Wang1, Jianfang Chen2, Haiyan Jin3, Hongliang Li4 and Kui Wang4, (1)Second Institute of Oceanography State Oceanic Administration, Laboratory of Marine Ecosystem and Biogeochemistry, Hangzhou, China, (2)Second institute of Oceanography, SOA, Key Laboratory of Marine Ecosystem and Biogeochemistry of SOA, Hangzhou, China, (3)State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography, SOA, Hangzhou, China, (4)Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
AH44A-0072
Reducing Hypoxia in the Northern Gulf of Mexico: Lessons from Simple and Complex Models (89079)
Dubravko Justic1, David Alan Fertitta2 and Lixia Wang1, (1)Louisiana State University, Oceanography and Coastal Sciences, Baton Rouge, LA, United States, (2)Louisiana State University, Baton Rouge, LA, United States
AH41A-06
Processes Controlling Eutrophication-Induced Acidification in the Northern Gulf of Mexico: Current State and Projected Changes from a Coupled Physical-Biogeochemical Model (91257)
Arnaud Laurent1, Katja Fennel2, Leticia Barbero3, Wei-Jun Cai4, Wei-Jen Huang5, Dong S Ko6, John C Lehrter7 and Richard H Wanninkhof3, (1)Dalhousie University, Halifax, NS, Canada, (2)Dalhousie University, Department of Oceanography, Halifax, NS, Canada, (3)Atlantic Oceanographic and Meteorological Laboratory, Miami, FL, United States, (4)University of Delaware, School of Marine Science and Policy, Newark, DE, United States, (5)University of Delaware, Newark, DE, United States, (6)Naval Research Laboratory, Stennis Space Center, MS, United States, (7)US EPA, Gulf Breeze, FL, United States
AH44A-0069
Long-term simulation of vertical transport process and its impact on bottom DO in Chesapeake Bay (91519)
Jiabi Du, Virginia Institute of Marine Science, Physical Sciences, gloucester point, VA, United States and Jian Shen, Virginia Institute of Marine Science, Gloucester Point, VA, United States
AH41A-08
Proximate and Ultimate Limiting Nutrients in the Mississippi River Plume: Implications for Hypoxia Reduction Through Nutrient Management (88723)
Katja Fennel, Dalhousie University, Department of Oceanography, Halifax, NS, Canada and Arnaud Laurent, Dalhousie University, Halifax, NS, Canada
See more of: Ocean Change: Acidification and Hypoxia