Climate Change and the Olympic Coast National Marine Sanctuary: Interpreting Potential Futures
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Marine Sanctuaries Conservation Series (ONMS-13-01) Climate Change and the Olympic Coast National Marine Sanctuary: Interpreting Potential Futures U.S. Department of Commerce National Oceanic and Atmospheric Administration National Ocean Service Office of National Marine Sanctuaries March 2013 About the Marine Sanctuaries Conservation Series The National Oceanic and Atmospheric Administration’s National Ocean Service (NOS) administers the Office of National Marine Sanctuaries (ONMS). Its mission is to identify, designate, protect and manage the ecological, recreational, research, educational, historical, and aesthetic resources and qualities of nationally significant coastal and marine areas. The existing marine sanctuaries differ widely in their natural and historical resources and include nearshore and open ocean areas ranging in size from less than one to over 5,000 square miles. Protected habitats include rocky coasts, kelp forests, coral reefs, sea grass beds, estuarine habitats, hard and soft bottom habitats, segments of whale migration routes, and shipwrecks. Because of considerable differences in settings, resources, and threats, each marine sanctuary has a tailored management plan. Conservation, education, research, monitoring and enforcement programs vary accordingly. The integration of these programs is fundamental to marine protected area management. The Marine Sanctuaries Conservation Series reflects and supports this integration by providing a forum for publication and discussion of the complex issues currently facing the sanctuary system. Topics of published reports vary substantially and may include descriptions of educational programs, discussions on resource management issues, and results of scientific research and monitoring projects. The series facilitates integration of natural sciences, socioeconomic and cultural sciences, education, and policy development to accomplish the diverse needs of NOAA’s resource protection mandate. All publications are available on the Office of National Marine Sanctuaries Web site (http://www.sanctuaries.noaa.gov). Climate Change and the Olympic Coast National Marine Sanctuary: Interpreting Potential Futures Edited by Ian M. Miller1, Caitlin Shishido2, Liam Antrim3, and C. Edward Bowlby3 1Washington Sea Grant, Olympic Peninsula Field Office, Port Angeles, WA 2Washington Sea Grant, Seattle, WA 3Olympic Coast National Marine Sanctuary, Port Angeles, WA U.S. Department of Commerce Rebecca M. Blank, Acting Secretary National Oceanic and Atmospheric Administration Kathryn Sullivan, Ph.D., Acting Under Secretary National Ocean Service Holly Bamford, Ph.D., Assistant Administrator Office of National Marine Sanctuaries Daniel J. Basta, Director Disclaimer Report content does not necessarily reflect the views and policies of the Office of National Marine Sanctuaries or the National Oceanic and Atmospheric Administration, nor does the mention of trade names or commercial products constitute endorsement or recommendation for use. Report Availability Electronic copies of this report may be downloaded from the Office of National Marine Sanctuaries web site at http://sanctuaries.noaa.gov. Hard copies may be available from the following address: National Oceanic and Atmospheric Administration Office of National Marine Sanctuaries SSMC4, N/ORM62 1305 East-West Highway Silver Spring, MD 20910 Cover A mosaic of perspectives on the ecosystems and organisms within the boundaries of Olympic Coast National Marine Sanctuary. All images: OCNMS Suggested Citation for Report: Miller, I.M., Shishido, C., Antrim, L, and Bowlby, C.E. 2013. Climate Change and the Olympic Coast National Marine Sanctuary: Interpreting Potential Futures. Marine Sanctuaries Conservation Series ONMS-13-01. U.S. Department of Commerce, National Oceanic and Atmospheric Administration, Office of National Marine Sanctuaries, Silver Spring, MD. 238 pp. Suggested Citation for Individual Sections: AUTHOR(S), YEAR. SECTION TITLE. In: Miller, I.M., Shishido, C., Antrim, L, and Bowlby, C.E. Climate Change and the Olympic Coast National Marine Sanctuary: Interpreting Potential Futures. Marine Sanctuaries Conservation Series ONMS-13-01. U.S. Department of Commerce, National Oceanic and Atmospheric Administration, Office of National Marine Sanctuaries, Silver Spring, MD. 238 pp. Contact Correspondence should be addressed to Ian M. Miller, [email protected] Executive Summary Due to global climate change, the Intergovernmental Panel on Climate Change (IPCC; www.ipcc.ch) projects a high likelihood that marine ecosystems around the globe will be measurably altered in the coming century (Bernstein et al. 2007). In some cases, the collapse of entire ecosystems is viewed as possible, or even likely. These projections are valuable in terms of describing the global implications of climate change and clarifying the role that anthropogenic emission of greenhouse gases plays in large-scale ecosystem change. However, they are less useful for assisting managers and policy-makers at the regional or local scale in their efforts to prepare for and, where possible, adapt to climate- related changes. The Olympic Coast National Marine Sanctuary (OCNMS) encompasses 572 square kilometers of marine and near-shore waters and intertidal habitat off of Washington State’s Pacific Ocean coast. As one of 14 national marine sanctuaries managed by the National Oceanic and Atmospheric Administration (NOAA), OCNMS is provided protected status because of extraordinary ecological and maritime heritage values. The Office of National Marine Sanctuaries developed its “Climate-Smart Sanctuary” program in order to facilitate the process of climate adaptation in these special marine waters. This assessment is designed to assist OCNMS in adapting to climate change by bridging the gap between the global projections provided by the IPCC, and the regional and local implications of climate change by 2100. The direct consequences of climate change on the physical environment in OCNMS were considered and, where possible, the direction and magnitude of change was estimated (Section 2). These physical effects were divided into seven categories: Increasing ocean temperature, ocean acidification, sea level rise, increasing storminess, changing ocean current patterns (with a focus on upwelling), increasing hypoxia or anoxia and altered hydrology in rivers draining into OCNMS. These are summarized here: • Based on the literature reviewed for this assessment it is considered likely that in the Pacific Northwest (including the habitats within OCNMS) average air and ocean temperatures will rise measurably by 2100, probably outside of the contemporary range of variability. Downscaling of multiple global climate models for the Pacific Northwest coastal zone suggests that ocean water could warm by approximately 1°C by 2050. (Section 2.2). • The magnitude and extent of corrosive ocean water (the term used in this report to describe ocean water with pH reduced relative to contemporary values and reduced availability of carbonate ions for calcifying organisms) is also expected to increase. Corrosive ocean water is currently associated with deeper water in OCNMS and is probably only drawn to the surface during periods of intense upwelling. By 2050, however, shallower areas within OCNMS will be exposed to corrosive water with greater frequency (Section 2.3). • Due primarily to the warming of the ocean and melting of land-based ice, mean sea level rise in OCNMS could exceed 1.0 m by 2100, but variable rates of i vertical land movement associated with tectonic forces will cause variations in the rate of relative sea level rise. Relative sea level is expected to be greater along the southern coast of shoreline within OCNMS as compared to the northern coast (Section 2.4). • Climate model projections suggest that the tracks of storms in the northeast Pacific Ocean will migrate, on average, further north due to climate change, but it is not clear if the magnitude or duration of storms will change. Observational evidence from locations in the northeast Pacific Ocean suggests the possibility that the ocean adjacent to OCNMS has become stormier in the last 50 years, though it isn’t clear if the trend is related to long-term climate trends (Section 2.5). • Projections regarding the possibility of increased upwelling favorable winds in OCNMS are mixed, and based on the contemporary variability in the timing, duration and intensity of upwelling favorable winds it is considered unlikely that climate change will cause measurable changes by 2100 (Section 2.6). Other factors besides upwelling favorable wind, notably warming of the surface layer of the ocean (Section 2.2), may also influence the timing and magnitude of upwelling and, by extension, productivity in OCNMS. • Concentrations of dissolved oxygen in the northeast Pacific Ocean are expected to decrease as the upper ocean warms and becomes more stratified. Based on the dynamics of water masses influencing ocean areas within OCNMS, dissolved oxygen concentrations in the ocean waters in OCNMS also may decline. Long- term declines in dissolved oxygen have been observed at numerous locations in the northeast Pacific, including coastal locations near OCNMS (Section 2.7). • Future warming in the Pacific Northwest region of the United States is projected to alter regional rainfall patterns and trigger more 100-year magnitude floods and lower summertime low flows among some basins that drain to OCNMS, including the Sol Duc, the Hoh, the Queets and the Quinault