Chemical sensor program
Project Managers: Luke Coletti and Ken Johnson
Lead Scientist: Ken Johnson
Lead Engineer: Luke Coletti
The goals of the Chemical Sensor Laboratory are to develop a suite of chemical sensors for dissolved constituents in seawater and to demonstrate the utility of these sensors by using them in significant and unique applications. Development of such sensors is critical to the successful implementation of ocean observatories and for observations of biogeochemical processes. Our group has made significant strides during the past few years. Efforts for 2005 are focused in the following areas:
1. Continued adaption of the In Situ Ultraviolet Spectrophotometer (ISUS) and the YSI 9600 (DigiSCAN) to a variety of other chemical measurements.
2. Continuing to extend endurance and reliablity of ISUS and DigiScan for long-term observatory measurements on moorings and in cold seep or hydrothermal environments. The ISUS on the M1 mooring has operated for nearly 9 months with minimal servicing, indicative of our success at these efforts.
3. Continue testing the feasibility of using ISUS to make eddy correlation measurements of nitrate flux across the sediment-water interface. If eddy correlation nitrate and oxygen flux measurements are feasible, then it would be possible to make continuous measurements of sediment community respiration without deploying benthic flux chambers.
4. Work with the NSF Land/Ocean Biogeochemical Observatory (LOBO) grant to establish a nutrient observing network in Elkhorn Slough.
5. Continue testing the feasibility of using OSMOSamplers to collect uncontaminated seawater samples for time series studies in the upper ocean.
6. Collaborate with Bob Vrijenhoek's group to deploy ISUS instruments in the Gulf of California.
7. Continue to explore methods for long-term measurement of seawater pH and collaborate with other MBARI colleagues on the development of sensors for this key chemical parameter.