Surface Trends forShagawa Lake

The RUSS data from Shagawa Lake has been summarized to show the average values of the measured parameters in the lake's surface layer on each day.

NOTE: Currently the RUSS unit is limited to an uppermost sampling depth of about 0.7 meters. Typically, we will average values for 1, 2, and 3 meters to calculate the mean "surface water" value.

1. temperature
2. turbidity
3. dissolved oxygen
4. pH
5. % oxygen saturation
6. electrical conductivity

Also available is a downloadable Excel spreadsheet (it's about 60 Kbytes) that contains all of the data and charts listed above.

We also follow other surface trends such as secchi depth as annual mean and based on the long-term average, chlorophyll, and the nutrients nitrogen and phosphorus. These graphs will be updated as the data becomes available (i.e. when our laboratory has a chance to run the sample analyses).

These data should be considered "provisional" until otherwise indicated. The data are undergoing several rounds of QA/QC review and some of the data may be modified at a subsequent date. We chose to leave the data hose on full blast whenever possible to familiarize ourselves with the operation and maintenance requirements of the RUSS units and to generate real data for use in developing curricula and lesson plans. Data gaps were associated with various RUSS system upgrades and occasional gremlins.