Upper ocean biogeochemistry
Temporal variability of nutrients in the upper ocean
Lead Scientist: Ken Johnson
Lead Engineer: Jon Erickson
Project Manager: Hans Jannasch
Long-term monitoring of dissolved chemicals in seawater is crucial to
understanding non-steady state biogeochemical processes in the ocean. Many
natural biogeochemical processes are known to undergo significant periodic
and sporadic changes. Our knowledge is limited mostly due to the lack of
data necessary to be able to characterize this variability. This project
directly addresses this problem by developing in situ analyzers to
continuously monitor chemical concentrations that can operate on
unattended oceanographic platforms for extended time periods.
This abstract represents the final year of developing the OsmoAnalyzer.
During 2000 we will complete field testing the redesigned OsmoAnalyzer,
incorporate a long flowcell for oligotrophic deployments, and test two
further adaptations to address reliability issues for nitrate in
high-nutrient environments. During 2000 we expect to coordinate
deployments in Monterey Bay to compare data and reliability with the
UV-sensor and DigiScanner. Deployments in Monterey Bay and on the Hawaii
Ocean Timeseries (HOT) mooring will focus on scientific questions regarding the characterization,
quantification and effects of nutrient injections into the mixed layer.