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Vertical Profiler Data

Continuous Monitoring at National Aquarium in Baltimore

Sometimes it is beneficial to measure water quality parameters at multiple depths rather than at a single fixed depth in the water column. In estuarine systems such as the Chesapeake Bay, tides, weather, and freshwater inputs can stratify the system, creating markedly different physical, chemical, and biological conditions at different water depths.

The vertical profiler is a monitoring instrument specifically designed for measuring water quality at multiple vertical locations in the water column. The vertical profiling system consists of a controller, winch, and data logging and telemetry system mounted on a floating platform. The winch is used to lower a water quality monitoring sonde through the water column, stopping at pre-determined depths to record temperature, salinity, dissolved oxygen, pH, turbidity and chlorophyll. The vertical profiler has been anchored at several sites in the Chesapeake Bay and, depending on the site, conducts a profiling sequence every 1-3 hours, with measurements recorded at 1-2 meter depth intervals.

The data collected by the vertical profiler have been used to detect the intrusion of low oxygen waters at a site, to monitor the onset of stratification and mixing events, and to distinguish water quality conditions at surface vs. bottom depths.

Select Station, Parameters, and a Date Range,
then "Submit Data Query"
1. Select a Vertical Profiler Station:

2. Select Parameter(s): 3. Enter Date Range:
Temperature (°C)
Salinity (ppt)
Dissolved Oxygen (mg/L)
Dissolved Oxygen (% Sat)
Turbidity (NTU)
Chlorophyll (µg/L)
Actual Depth (m)*
    eg. 0.495, 0.942, 1.989
Rounded Depth (m)*
    eg. 0.5, 1.0, 2.0
Start Date: (after 06/29/07)

End Date: (before 12/19/17)
Large queries may take a while, please be patient
while your data are retrieved.

* The vertical profiler records measurements at regular depth intervals: eg. ~0.5m, ~1m, ~2m, etc. Depending on your data application you may choose to download the data with the actual depth measurement recorded by the instrument during sampling (eg. 0.495, 0.942, 1.989), or as depth rounded to the nearest depth approximation (eg. 0.5, 1.0, 2.0), or both.
NOTE: 2018 data are provisional and has not yet been through our rigorous Quality Assurance procedures.