Surveying the state of ocean acidification along the U.S. West Coast

Surveying the state of ocean acidification along the U.S. West Coast

Richard Feely - Pacific Marine Environmental Laboratory

PMEL Sustained Ocean Acidification Biogeochemical and Ecological Survey Observations

Why we care
U.S. West coast-wide hydrographic surveys have been conducted intermittently from 2007 to 2017, providing evidence for the geographic extent and severity of ocean acidification in the continental shelf ecosystem. Scientists on the NOAA West Coast Ocean Acidification (WCOA) discovered that the combined effects of anthropogenic and biologically-derived carbon dioxide resulted in significant biological impacts for oyster larvae and pteropods, which are small, ecologically important mollusks for the food web. 

What we are doing
This project executes a large-scale survey of ocean acidification carbonate chemistry in the California Current System and continues processing data and publishing scientific papers based on 2016 and 2017 surveys findings. This survey determines the spatial distributions of temperature, salinity, pH, dissolved inorganic carbon, total alkalinity, oxygen, nutrients, and biological parameters along the west coast of North America. Survey results will provide the basis for accurate assessments of changing ocean chemistry in the following areas: 1) spatial variability; 2) extent and causes of long-term changes in carbonate system parameters and their impacts on calcifying (shell-building) organisms; and 3) empirical relationships for obtaining high-resolution information on ocean acidification collected on moorings. 

Benefits of our work
This project links the combined stressors of increased temperature, acidification, and hypoxia (low oxygen) with effects on marine organisms in the region and identifies spatial variability of acidifying conditions during the spring/summer upwelling season. In addition to scientific partners, this project engages a NOAA Teacher At Sea (TAS) fellow on the cruise to help develop outreach and education on West Coast ocean acidification.


Wednesday, August 31, 2022
Sustained ocean acidification monitoring on ships of opportunity in the Pacific

Sustained ocean acidification monitoring on ships of opportunity in the Pacific

Simone Alin - Pacific Marine Environmental Laboratory

PMEL Sustained Investment Coastal Underway Ocean Acidification Observations (PUO)

Why we care
Underway ship measurements of ocean acidification (OA) data on ships of opportunity (SOOP) have proven to be a robust and cost-effective way of expanding OA observations. Ship-based observations provide an understanding of the spatial extent of processes that drive OA. Surface underway observations, in conjunction with coastal moorings and dedicated large-scale surveys, make an important contribution to addressing the hypothesis that acidification varies across space and time as a consequence of local and regional processes.


What we are doing 
The focus of this project is to sustain existing underway OA monitoring systems on NOAA Ships Oscar Dyson and Bell M. Shimada, which operate along the U.S. West Coast. Project objectives also include sustaining underway OA observations in the equatorial Pacific, upgrading sensor systems, and improving oxygen data collection. 

Benefits of our work
This project increases high-quality surface water OA data taken underway to accompany NOAA Fisheries cruises. Efforts also improve spatial and temporal coverage of OA measurements, improving our understanding of OA variability along the Pacific coast of North America.


Wednesday, August 31, 2022
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