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Science Mission Task 3.4 Acidity   

The QUIMA-ULPGC pH sensor developed by Melchor Gonzalez-Davilla and team was deployed in shallow water (2m) as an in situ test in July 2009. The system was located at 2m depth working under the tide cycle (depth change was ~ 1m). This deployment in coastal waters was additional to testing at ESTOC which has been rescheduled deployed until early 2010. The sensor trial was successful and data were received in real time directly to the lab. Bidirectional SMS communication was used in transparent mode, allowing the ULPGC team to interact with the system asking any command we need.

Figure 1. Shallow water (2m) deployment of QUIMA-ULPGC pH sensor in July 2009 (EuroSITES M18) as part of EuroSITES WP3 Task 3.	Figure 2. pH in total scale at in situ conditions (Sea Surface Temperature, SST, also included as red dots) received in the ULPGC-QUIMA laboratory by bidirectional telemetry from the shallow water (2m) deployment from June 16 2009 (EuroSITES M18)

Further images and information are contained in the folowing Powerpoint Click Here (2.5Mb)

• Traditional discrete pH spectroscopy determinations will be carried out daily in conjunction with pH sensor readings in lab-based trial prior deployment at ESTOC for at least three months.
• Deployment at ESTOC buoy of the pH sensor for several months
• Intercomparison of theoretical pH data from pCO2 sensor and total Alkalinity (from salinity) with new experimental pH data and interpretation.

Output: Temporal variability in pH at ESTOC which will be combined with data obtained by other programmes on the entire carbon system at the site.