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PROGRESS REPORT FOR DOE GRANT DE-FG02-92ER61426
20 January 1993
Moored instrument for time series studies of primary production and other microbial rate
processes.
Award dates: 1 May 1992- 30 April1994 DOE/ER/61426--l
Craig D. Taylor and Kenneth W. Doherty DE 9 3 010148
Woods Hole Oceanographic Institution
Woods Hole, MA 02543
OVERVIEW:
The goal of this project is to build and test a Time Series Submersible Incubation
Device (TS-SID) capable of the autonomous in situ measurement of phytoplankton product. 'I
and other rate processes for a period of up at least three months. The instrument is
conceptually based on a recently constructed Submersible Incubation Device (SID, Taylor and
Doherty. 1990. Deep Sea Res. 37: 343-358). The TS-SID is to possess the ability to period-
ically incubate samples in the presence of an appropriate tracer, and to store 94 chemical-
ly fixed subsamples for later analysis. The TS-SID has been designed to accurately
simulate the natural environment, and to avoid trace metal contamination and physical
damage to cells. Devices for biofouling control of internal and external surfaces are to
be incorporated into the instrument. After the time series capabilities of the instrument
have been successfully evaluated by medium-term coastal time series studies (up to one
month), longer-term coastal time series studies (2-3 months) will be conducted to evaluate
the biofouling prevention measures that have been used with the instrument.
PROGRESS:
According to the proposed time line, construction of the instrument is to be completed
by the end of the first year of the grant (31 April 1993) and time series testing of the
completed instrument is to begin shortly thereafter. Construction of the TS-SID is pre-
cisely on schedule. A diagrammatic representation of the TS-SID as it is presently being
constructed is shown in Figure 1. At present (mid-January 1993), all of the
electromechanical modules have been built and are undergoing laboratory testing. This
includes the a) incubation chamber with biofouling control, b) gear pump, c) subsample
distribution valves (2), d) acid injector and e) tracer injector. The electronics package
is presently under construction and scheduled for completion by the beginning of February.
Software required for this instrument is relatively straight forward and has by-and-large
been developed. Routines for all of the electromechanical and data acquisition functions
are operational as well as a majority of the routines for integrating the various module
functions during a typical time series deployment. As testing proceeds software stream-
lining and modification will uwioubtedly be required.
The TS-SID under construction will incorporate some conceptual improvements over that
presented in the proposal. The most significant is the implementation of two 50-port
subsample distribution valves (Figure 1A) rather than three 32-port valves proposed in the
original conceptual design. Not only does this reduce the number of electromechanical
devices required for procurement of subsamples but also eliminates the need for a multi-
plexor board for the electronic control of the valve modules. Protection from both inter-
nal and external biofouling will be effected using the acid injector and a biofouling
control collar (see Figure 1D). The biofouling control collar is mechanically connect ER
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Schudlich, R. & Emerson, S. Upper ocean model of dissolved atmospheric gases, report, January 1, 1992; Seattle, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1199345/m1/1/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.