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A sensor package for mapping pH and oxygen from mobile platforms
Bresnahan, P.J.; Wirth, T.; Martz, T.R.; Andersson, A.J.; Cyronak, T.; D'Angelo, S.; Pennise, J.; Melville, W.K.; Lenain, L.; Statom, N. (2016). A sensor package for mapping pH and oxygen from mobile platforms. Meth. Oceanogr. 17: 1-13. dx.doi.org/10.1016/j.mio.2016.04.004
In: Methods in Oceanography. Elsevier: Amsterdam. ISSN 2211-1220; e-ISSN 2211-1239, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Bresnahan, P.J.
  • Wirth, T.
  • Martz, T.R.
  • Andersson, A.J.
  • Cyronak, T.
  • D'Angelo, S.
  • Pennise, J.
  • Melville, W.K.
  • Lenain, L.
  • Statom, N.

Abstract
    A novel chemical sensor package named “WavepHOx” was developed in order to facilitate measurement of surface ocean pH, dissolved oxygen, and temperature from mobile platforms. The system comprises a Honeywell Durafet pH sensor, Aanderaa optode oxygen sensor, and chloride ion selective electrode, packaged into a hydrodynamic, lightweight housing. The WavepHOx has been deployed on a stand-up paddleboard and a Liquid Robotics Wave Glider in multiple near-shore settings in the Southern California Bight. Integration of the WavepHOx into these mobile platforms has enabled high spatiotemporal resolution pH and dissolved oxygen data collection. It is a particularly valuable tool for mapping shallow, fragile, or densely vegetated ecosystems which cannot be easily accessed by other platforms. Results from three surveys in San Diego, California, are reported. We show pH and dissolved oxygen variability >0.3 and >50% saturation, respectively, over tens to hundreds of meters to highlight the degree of natural spatial variability in these vegetated ecosystems. When deployed during an extensive discrete sampling program, the WavepHOx pH had a root mean squared error of 0.028 relative to pH calculated from fifty six measurements of total alkalinity and dissolved inorganic carbon, confirming its capacity for accurate, high spatiotemporal resolution data collection.

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