CYCLE PO4 Wet Chemistry In-situ Nutrient analyzer

Comparison of CYCLE PO4 data from Clinton River, Michigan to field blanks and laboratory measured water samples. Alliance For Coastal Technologies Results.

Chesapeake Biological Laboratory – One Month Deployment extended for a month.

Salinity and temperature time series for the latter part of the CBL time series. The vertical lines denote the days that rain was recorded. The rain event appears to divide the time series into two separate patterns.

Estimated chlorophyll concentration and dissolved oxygen time series from the CBL data. The chlorophyll and DO records are closely coupled throughout the time series suggesting that biological oxygen production was the primary control of the dissolved oxygen concentration during this time series

The CYCLE phosphate concentration and turbidity time series show similar periodicity, most likely tidal. The phosphate signal phase shifts with respect to the turbidity signal suggesting that both advective and local resuspension processes contribute to turbidity and phosphate concentrations

The CYCLE phosphate concentration and chlorophyll time series, with the chlorophyll data presented on a reversed vertical scale. Before the rain event, phosphate concentrations were generally extremely low. After the rain event, phosphate concentration spiked up and chlorophyll decreased to a minima. Subsequently, phosphate and chlorophyll were closely inversely coupled suggesting uptake driven kinetics controlled the phosphate concentration.

AMP-C100 vertical profiler Specifications for coastal and inland waters in depths < 100m. Deployment 90 days or 36 km distance traveled Maximum current speed for profiling ~1 m s -1 Capable of deploying/recovering from a small vessel Programmable for complete autonomous sampling, profiling speeds 2–35 cm s -1 Power Input voltage range ~ VDC (30 VDC nominal) Battery pack: rechargeable ~50 30 V Core measurement suite CTD (Sea-Bird Electronics FastCat), chlorophyll and cdom fluorescence and single channel backscattering sensor (WET Labs ECO) Optional instrumentation: dissolved oxygen and current sensors. Core Package and Data Controller Instrument I/O, platform control, power supervising, remote communications control, data archiving. Winch controller for profiling control: diagnostics for battery voltage/consumption, tilt/roll, cable tension, location (GPS) Winch System Spectra© rope for profiling Allows for user defined ascent/descent rates, and hold position Constant current drive for adaptive control near surface. Telemetry Options Two-way communications for data download and remote programming Free-wave (RF), CDMA, Broadband, and wireless CISCO Data GUI-based control software for system interfacing and data reception/transmission Raw data archiving Data processing to produce engineering units Data merging based on time/depth

AMP-C200 vertical profiler IN DEVELOPMENT: NSF supported research to extend the range (200 m), duration (180 days) and instrument payload of profiler. Partnership with Oregon State University (Barth and Levine). Docking/recharging station testing has been successful.