MBARI chemical sensor program
Lead Scientist/Project Manager: Ken Johnson
We will continue to develop a suite of chemical sensors for dissolved
constituents in seawater. The sensors will be used in a variety of
oceanographic studies to demonstrate their utility. Our primary focus in
2000 will be on the continued development of in situ, ultraviolet
spectrophotometric (ISUS) sensors. In addition, we will continue the
development of solenoid-pumped, submersible chemical analyzers for in situ
trace element measurements and for phosphate and silicate analyses.
We believe that the simplicity of direct chemical sensing with ISUS
sensors will make this approach the method of choice for measurements of
chemicals that absorb light in the UV region (NO3-, NO2-, HS-, DOC). As soon as
prototype instruments are available for in situ operation, we intend to
begin testing them in collaboration with existing MBARI science projects.
For example, we will configure an ISUS system for HS- measurements on
either of the ROVs. We have a particular interest in deploying that
system for hydrothermal vent and cold seep system research. Initial
deployments will be oriented towards exploratory science before we
consider long-term deployments.
The system should also be particularly well suited for nitrate
measurements during long-term deployments on oceanographic moorings for
MOOS. Adaptation of a system for mooring deployments will begin with tests
in Monterey Harbor at the MBNMS dock and then on the M1 mooring. We
believe the system can be rapidly transitioned to deployments in the
equatorial Pacific. The high nitrate concentrations in the equatorial
waters make this region particularly well suited for early deployments.
Development of iron, phosphate and silicate sensors using our solenoid
pump based system will also be continued. An initial goal will be to place
an iron monitoring system on the M1 mooring.
This work is also supported by funding from the National Science