Sea Technology

OCT 2018

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

Issue link:

Contents of this Issue


Page 14 of 45 October 2018 | ST 13 was measured using standard seawater pH spectrophoto- metric methods. The instruments recorded two weeks of data and then were returned to Sea-Bird for data analysis. The resulting accuracy of the Deep Sea- pHOx V2 was found to be 0.0077 pH af- ter salinity corrections, which was at least two times better than the Shallow SeaFET V1 and ƒve times better than the current accuracy speciƒcation of 0.050 pH. After characterization and validation at Sea-Bird, the Deep SeapHOx V2 was redeployed in November 2017 for one week, with bottle samples at the beginning and end of this deployment. The resulting accuracy of the Deep SeapHOx V2 was found to be 0.0072 pH, approximately the same as the previous deployment. This result demonstrates the excellent reproducibility of the new Deep SeapHOx V2. After the deployment, the Deep Sea- pHOx V2 performance was evaluated at Sea-Bird in seawater test baths. The post-ƒeld deploy- ment accuracy of the instrument was found to be 0.0021 pH, three times better than the ƒeld performance. The culmination of the results from these deployments demonstrates the improved accuracy of the Deep Sea- pHOx V2 in the ƒeld. ST Greg Ikeda is the content development manager at Sea-Bird Scientic. Orig- inally starting on Sea-Bird's technical support team, he brings a background of eld experience and technical knowledge to assist with scientic projects and content development. He has a B.S. in oceanography from the Univer- sity of Washington. A two-week time series of pH from a Deep SeapHOx V2 and Shallow SeaFET V1, deployed at Shilshole Marina in Seattle, Washington, October 2017. The black line is the pH from the Deep SeapHOx V2. The blue and red lines are the predicted pH from the external and internal reference of the Shallow SeaFET V1, respectively. Green represents the pH bottle samples. State-of-the-art Motion & Navigation Solution Navsight Marine Solution Qinertia The Next Generation INS/GNSS Post-processing Software Courtesy of Cadden Making Hydrographers' Tasks Easier Booth #14 Booth #1C4-09

Articles in this issue

Links on this page

Archives of this issue

view archives of Sea Technology - OCT 2018