Ocean and Coastal Acidification Thresholds from Long Island Sound to the Nova Scotian Shelf

Ruairidh Morrison, NERACOOS

How will nearshore and coastal ecosystems respond to ocean and coastal acidification in the Northeast? How will these changes affect human communities? An absence of actionable information and understanding of the dynamic nature of coastal acidification is a major challenge to Northeast seafood industry, resource managers, and coastal policymakers. This project will expand the existing Northeast Coastal Ocean Forecast System to develop actionable guidance for coastal water quality and marine resource managers through workshops and direct engagement. Workshops and focus groups will be held to determine information needs, decision scenarios, modeling priorities, and options for delivering actionable information for three specific users: (1) water quality managers and monitoring systems, (2) oyster growers, and (3) the wild harvest shellfishing industry. The research will focus on advancing ocean acidification detection and warning systems that take into account other environmental stressors in Northeast coastal waters.
Tuesday, October 2, 2018

Low pH in Coastal Waters of the Gulf of Maine: A Data Synthesis-Driven Investigation of Probable Sources, Patterns and Processes Involved

David W. Townsend, University of Maine

Coastal Maine supports valuable lobster, clam, oyster and other shellfish industries that comprise >90% of Maine’s record $616M landed value last year. Earlier monitoring efforts in Maine and New Hampshire have documented periods of unusually acidic conditions in subsurface waters of Maine’s estuaries, which may be driven by episodic influxes of waters from the Gulf’s nutrient-rich, highly productive coastal current system. Sources of acidity to the estuaries also include the atmosphere, freshwater fluxes, and local eutrophication processes, all modulated by variability imparted by a number of processes.This project is a data synthesis effort to look at long-term trends in water quality data to identify the key drivers of acidification in this area. Extensive data sets dating back to the 1980s (including carbonate system, hydrography, oxygen, nutrients, and other environmental variables) will be assembled, subjected to QA/QC, and analyzed to assess acidification events in the context of landward, seaward and direct atmospheric sources, as may be related to processes operating on tidal to decadal timescales. Such analyses are requisite for any future vulnerability assessments of fishery-dependent communities in Maine and New Hampshire to the effects of coastal acidification.

Friday, December 22, 2017