Marine Water photo

Marine Water Quality Monitoring

Long-Term Data Access

Marine Flight Data

Data  prior to 1989
Download an Excel spreadsheet explaining the methods, quality, and data before 1989.

Data 1989 - present
Connect with Ecology's database and a data query interface.
Vertical profiles
Explore CTD profiles in historical context.

Anomalies 1999 - present
Download anomalies for all variables that support the Marine Water Condition Index in Excel format. Explore heat maps with embedded data.

Continuous Mooring Data

Current real time data
Access real-time mooring data by searching a map. Explore current data graphs and access source data.

Historic data and sites
Get our record of historical mooring data from our ftp server. Read the "read me" text file.

Ferry Data

Note: We are developing a refined en route ferry data access. Please revisit this site again in the future.

Victoria Clipper
Note: We currently offer data as they come from the ship instruments: data in Matlab format.


Data Quality

High data quality is mandatory for Ecology's Long-Term Monitoring Program and ensures that trends accurately reflect true environmental change. We routinely perform data quality assurance (QA), data quality controls (QC) and data group reviews to ensure that our data meet highest quality standards. Data quality codes are applied to the dataset allowing you to decide the appropriate level of quality for your analysis. Detailed information on data quality can be found at:

A. Marine Flight Data (Download)

Marine flight data serve as Ecology's backbone to determine long-term trends and patterns in water quality related to eutrophication estuarine processes. Sensors are subjected to strict performance test prior to flights. We use a Sea-Bird CTD package equipped with sensors for vertical water column profiles and Niskin bottles for collecting water samples at pre-assigned depth.

  • Continuous vertical profiles- We conduct pre-flight performance tests and take intermittent sensor performance samples during flights.

  • Discrete water samples - To ensure highest analytical quality, we include blank and control samples of known concentration in our data stream.

  • Data collected prior to 1989.

For marine flight data both accuracy and precision are known at all times. The high data quality allows us to determine longterm shifts in water quality baseline conditions. Flight data also help to calibrate marine in situ sensors maintained by Ecology and its partners. A limited temporal resolution precludes us from detecting a change in the frequency, amplitude and duration of events that also can affect water quality.

B. Mooring (Quality Assurance Monitoring Plan) and Ferry Data (Victoria Clipper)

In situ sensors mounted to permanent moorings or moving ferries offer high precision and excellent temporal resolution. The advantages of the approach is to measure processes to complement our long- term marine flight program. In situ sensors are, however, exposed to the marine environment for long time periods and a systematic drift over time is inevitable (cause for a systematic bias and changing accuracy). Mooring and ferry data can be harvested with different level of data quality. A drift adjustment of sensor data can be done typically at the end of a deployment cycle in our database. We therefore offer:

  • Real-time data (Download) - a coarse and automated quality control ensures that sensor are not reporting outside natural ranges.

  • Archived data (Download) - a refined data review and data drift adjustment removes data issues. Data quality codes inform about data issues. (Drift is assumed to be linear and accuracy can only be approximated over the deployment period)

  • En route ferry data (Link to ferry data and information)

In situ sensors offer a unique insight into environmental processes and complement our long-term marine monitoring flight programs. Their strength reside in quantifying the dynamic of patterns with high temporal variability such as tides, oceanic low-oxygen intrusions and storms. Both flight and mooring data need to be evaluated side by side as part of a larger marine monitoring effort. We share our information with our marine monitoring partners for an improved understanding of our marine environment.