Chemical Sensor Program
Project Managers: Luke Coletti, Ken Johnson
The goals of the Chemical Sensor Laboratory are to develop a suite of chemical sensors for dissolved constituents in seawater. 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.
1) We will continue adapting the ISUS (In Situ Ultraviolet Spectrophotometer) and DigiSCAN (Digital Submersible Chemical ANalzyer) to a variety of other chemical measurements. In 2002/2003, we successfully adapted DigiSCAN to measure phosphate.
2) We will continue efforts to extend endurance and reliablity of ISUS and DigiScan for long-term observatory measurements on moorings and in cold seep or hydrothermal environments.
3) In collaboration with Jim Barry, we will test 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. Such observations would provide real-time, continuous flux measurements on a cabled observatory.
4) Much of our effort will be intertwined with the National Science Foundation LOBO (Land/Ocean Biological Observatory) grant to establish a nutrient observing network in Elkhorn Slough.
5) Finally, we are also continuing to test the feasibility of using the OSMOSamplers to collect uncontaminated seawater samples for time series studies in the upper ocean.