Alaska Ocean Acidification Research: Autonomous Observations of Ocean Acidification in Alaska Coastal Seas

Jessica Cross, NOAA Alaska Fisheries Science Center

This OAP project represents the first contribution of OAP to sustained coastal Alaska OA monitoring through three years (2015-2017) of maintenance of two previously established OA mooring sites located in critical fishing areas. In FY2015, It also supported a 19 day OA survey cruise along the continental shelf of the Gulf of Alaska in summer of 2015, designed to fill observing gaps that have made it difficult to quantify the extent of OA events. This support has been critical for continuing OA research in Alaska, as the initial infrastructure funding was not sufficient or intended for long-term operation. 

These OAP-sponsored monitoring and observing activities support a number of cross-cutting research efforts. Firstly, the data itself will provide new insights into the seasonal progression of OA events caused by the progressive accumulation of anthropogenic CO2 into the region's coastal seas. The mooring and cruise data can also be used as an early warning system for stakeholders around the state, as well as to provide information for other types of OA research. Other projects within the OAP Alaska Enterprise focus on laboratory based evaluation of the impact of OA on commercially and ecologically important Alaskan species, especially during the vulnerable larval and juvenile life stages. This environmental monitoring informs those studies by describing the intensity, duration, and extent of OA events and providing a baseline for projecting future conditions. Finally, this observational data is used to validate new OA models that are currently being developed for the Gulf of Alaska and Bering Sea, and are applied in bio-economic models of crab and pollock abundance forecasts (e.g., Punt et al., 2014; Mathis et al., 2014).

Wednesday, November 16, 2016
Categories: Projects

Effects of OA on Alaskan gadids: sensitivity to variation in prey quality and behavioural response

Tom Hurst, NOAA Alaska Fisheries Science Center

To date many studies of the effects of ocean acidification on fishes have suggested that fish are somewhat resilient to effects on factors such as growth and survival. However, these experiments have generally not included potential interactive stressors which may increase the sensitivity to acidification stress. Further, experiments on some species have demonstrated the OA stress has significant potential to disrupt sensory and behavioral systems in fishes which could compromise survival in natural settings. In this project we will focus on examining the potential for behavioral disruptions due to OA and the interactive stresses of OA and nutritional state on critical Alaskan groundfishes.

Wednesday, November 16, 2016
Categories: Projects

Forecasting the effects of OA on Alaska crabs and pollock abundance

Mike Dalton, NOAA Alaska Fisheries Science Center

The aim of this project was to forecast effects of ocean acidification on the commercially important Alaska crab stocks including the Bristol Bay red king crab (BBRKC) fishery, which is part of a modern fisheries management program, the Bering Sea and Aleutian Islands (BSAI) crab rationalization program. To investigate the biological and economic impacts of OA, a linked bioeconomic model was developed that a) integrates predictions regarding trends over time in ocean pH, b) separates life-history stages for growth and mortality of juveniles and adults, and c) includes fishery impacts by analyzing catch and effort in both biological and economic terms. By coupling a pre-recruitment component with post-recruitment dynamics, the BBRKC bioeconomic model incorporates effects of OA on vulnerable juvenile crabs in combination with effects of fishing on the BBRKC population as a whole. Many types of projections under management strategies can be made using linked bioeconomic models.

Wednesday, November 16, 2016
Categories: Projects

Physiological response of commercially important crab species to predicted increases in carbon dioxide

Bob Foy, NOAA Alaska Fisheries Science Center

In 2010 and 2011, Alaska Fisheries Science Center (AFSC) scientists at the Kodiak Laboratory in Alaska tested the effects of lower pH due to increased carbon dioxide (CO2) on the survival, condition, and growth of red king crab (Paralithodes camtschaticus). Commercially important shellfish are a priority for AFSC research related to ocean acidification because of their economic value and because calcifying species are likely to suffer direct effects due to increased acidity (and a decrease in calcium carbonate saturation state) of our oceans.

The multi-year project objectives are to test the effects of CO2 enrichment (which leads to decreasing pH and lower saturation state) across a range of commercially important crab species and life stages (embryo, larvae, juveniles, and adults). The response variables currently measured include mortality, condition, growth, and calcification of the shell.

Wednesday, November 16, 2016
Categories: Projects

Multi-Scale Prediction of California Current Carbonate System Dynamics

Burke Hales, Oregon State University

The California Current is a dynamic eastern boundary system that spans the Northeast Pacific from Canada to Baja California, Mexico. Upwelling of cold, nutrient rich water drives multi trophic level productivity throughout much of the domain, but also results in naturally acidic on-shelf waters on regional scales. In addition, anthropogenic CO2 on basin to global scales, and local inputs by eutrophication, fresh water inputs, and local respiration or carbon assimilation result in multiscale and context-specific perturbations to the carbonate system. Thus, to understand, manage, or mitigate the effect of ocean acidification on ocean ecosystems, we need to quantify a suite of carbonate system parameters along the Pacific Coast in a mechanistic, spatially explicit, and temporally dynamic fashion.

We propose to embed an improved semi-analytical carbonate-chemistry prediction model within a dynamic classification of pelagic seascapes derived from satellite remotely sensed variables, including, but not limited to, phytoplankton standing stock (chl-a), SST, and wind stress. We will produce synoptic time series and nowcasts of surface TCO2, TALK, pH and Ω that will facilitate regional comparisons of interannual trends in OA parameters. We will include metrics of model and spatiotemporal uncertainty to better inform management decisions. These maps will be validated with the wealth of multi-parameter OA data generated from recent NOAA-supported field-observational efforts, from coastal moorings, West-coast OA cruises, and shore-based Burke-o-Lators. Statistical analyses will quantify spatially explicit trends across OA parameters, and local deviations from seascape-based predictions will disentangle basin-scale oceanic vs. local drivers of the carbonate system. Maps will be served in near real time on IOOS data portals. Time series and maps will inform marine ecosystem management and provide metrics of ocean health for National Marine Sanctuary condition reports.

Wednesday, November 16, 2016
Categories: Projects
RSS
First78910111213141516