Eddy flux system for benthic flux measurements
Project Manager & Lead Scientist: Jim Barry
Lead Scientist: Ken Johnson
Lead Engineer: Mark Chaffey
Eddy correlation flux measurements—a method under use for decades to measure fluxes of CO2 and methane in terrestrial plant communities—is an emerging technology for oceanic studies which may enable high resolution measurements of benthic rate processes using instruments moored on seafloor observatories. Eddy flux measurements of oxygen and nitrate were explored during 2004, resulting in the proposed development of a lander system that would allow more precise control of the position and activities (data rates) of sensors for flux measurements. To date, we have obtained some preliminary data from the continental shelf, but do not yet have a reliable system for flux estimates.
This project would also overlap with engineering development for the MOOS mooring, as a test system requiring interactive control, and potentially high data rates. Our plan is to deploy the existing (with small modifications) prototype eddy flux lander at the MOOS test mooring site, prior to the mooring recovery at mid-year. Engineering will support driver development for connectivity and control through the MOOS cable / BIN.
Contingent upon initial progress, we will develop a more sophisticated lander, capable of modifying the height of the instruments off the seafloor, and with additional sensors. Sensors would include multiple current meters, multiple oxygen sensors, and perhaps multiple ISUS systems for nitrate measurements.