AH33A:
Nutrient-Enhanced Coastal Acidification and Hypoxia and Other Anthropogenic Impacts on Biogeochemical Processes I


Session ID#: 11402

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:  John Lehrter, US EPA, Gulf Breeze, FL, United States, Wei-Jun Cai, University of Delaware, Newark, DE, United States, Richard B Rivkin, Memorial University of Newfoundland, St John's, NL, Canada and Nianzhi Jiao, Xiamen University, National Key Laboratory, Xiamen, China
Student Paper Review Liaisons:  M Robin Anderson, Fisheries and Oceans Canada, Environmental Science Division, St. John's, NF, Canada and Cheryl Ann Brown, US EPA, Newport, OR, 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:

AH33A-01
Anthropogenically Forced Changes in the Balance Between the Supply of and Demand for Organic Carbon in the Upper Ocean: Is the Estimation of Heterotrophic Organic Carbon Demand Biased? (87659)
Louis Legendre, Université Pierre et Marie Curie, Paris, France, Richard B Rivkin, Memorial University of Newfoundland, St John's, NL, Canada and M Robin Anderson, Fisheries and Oceans Canada, Environmental Science Division, St. John's, NF, Canada
AH33A-02
Diversity and distribution of isiA-containing Cyanobacteria in the global ocean (90974)
Qian Li1,2, Maayke Stomp1, Jef Huisman3 and Nianzhi Jiao4, (1)University of Amsterdam, Department of Aquatic Microbiology, Amsterdam, Netherlands, (2)State Key Lab for Marine Environmental Sciences, Xiamen University, Institute of Microbes and Ecospheres, Xiamen, China, (3)University of Amsterdam, Institute for Biodiversity and Ecosystem Dynamics, Amsterdam, Netherlands, (4)State Key Lab for Marine Environmental Sciences, Xiamen University, Institute of Microbes and Ecospheres, China
AH33A-03
Distribution of Nitrogen Compounds in Marine Aerosol and Their Deposition Over the Pacific Ocean (88139)
Mitsuo Uematsu1, Yasushi Narita1 and Si Yi Sun2, (1)Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan, (2)Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan
AH33A-04
Connecting the Mississippi River with Carbon Variability in the Gulf of Mexico (89865)
Z. George Xue, Louisiana State University, Baton Rouge, LA, United States, Ruoying He, North Carolina State Univ., Raleigh, NC, United States, Katja Fennel, Dalhousie University, Department of Oceanography, Halifax, NS, Canada, Wei-Jun Cai, University of Delaware, School of Marine Science and Policy, Newark, DE, United States, Steven E Lohrenz, University of Massachusetts Dartmouth, New Bedford, MA, United States, Wei-Jen Huang, University of Delaware, Newark, DE, United States, Hanqin Tian, Auburn University, Auburn, AL, United States and Wei Ren, University of Kentucky, Lexington, KY, United States
AH33A-05
Marine Snow ― A Hotspot Microenvironment for Microbial Horizontal Gene Transfer and Enhanced Metabolism (91425)
Hongyue Dang, Xiamen University, Xiamen, China
AH33A-06
Spatio-temporal variability of Asian dust and its impact on biological productivity in the East/Japan Sea (89305)
Joo-Eun Yoon1, Il-Nam Kim1, Tae-Wook Kim2, Alison M Macdonald3 and Hyun-cheol Kim4, (1)Incheon National University, Department of Marine Science, Korea, Republic of (South), (2)Incheon National University, Department of Marine Science, Incheon, Korea, Republic of (South), (3)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (4)Korea Polar Research Institute, Incheon, Korea, Republic of (South)
AH33A-08
Anthropogenic Impacts on Biological Carbon Sequestration in the Coastal Waters (93486)
Nianzhi Jiao, Xiamen University, National Key Laboratory, Xiamen, China
See more of: Ocean Change: Acidification and Hypoxia