Scientific Case Study

Alliance for Coastal
Technologies (ACT)
Demonstration Study

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The Scenario

Accurate measurements of pCO2 in the oceans are critical for determining the distribution of ocean sources and sinks, understanding ocean uptake of CO2 and monitoring the progress of ocean acidification.


The Challenge

Pro-Oceanus Systems was invited to participate in the Alliance for Coastal Technologies (ACT) demonstration study to determine if the technology embodied by commercially available submersible pCO2 sensors was sufficiently mature to provide accurate and stable measurements of pCO2 in time series.


The Solution

In October 2009 the Alliance for Coastal Technologies conducted a demonstration study to determine feasibility of measuring pCO2 using in situ instrumentation. Pro-Oceanus Systems was one of three manufacturers of submersible CO2 sensors to participate in the ACT sponsored study in Kaneohe Bay, Hawaii. The measurements were made on the edge of a healthy coral reef where tidal flows and the cycle of photosynthesis and respiration caused pCO2 levels to vary by nearly 400 µ-atm in a tidal cycle. Of submersible sensors, only the CO2-Pro™ gave results that fell within the estimated error of wet chemical measurements made by ACT scientists.

GRAPH: ACT trial results (blue dots: ACT data; red line CO2-Pro™ data)
MAP: Study location adjacent to a healthy coral reef in Kaneohe Bay, Hawaii


Summary

Pro-Oceanus scientists participated in the Alliance for Coastal Technologies demonstration project for submersible pCO2 sensors in Kaneohe Bay, Hawaii. Results showed that of the three submersible sensors commercially available, only the Pro-Oceanus CO2-Pro™ gave measurements that fell within the estimated error of the wet chemical measurements made by ACT personnel.


ACT trial

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