Vital signs in an estuary: how do you get the data?

When you visit a doctor, he or she usually uses a medical device to measure your vital signs, such as heart rate, blood pressure and temperature. The doc might also draw some blood to test in the laboratory for its biochemical composition. Environmental scientists do similar activities to determine the health of an estuary. But an estuary is huge in comparison to a human being; getting enough data to draw meaningful conclusions can be challenging.

LOBO's launch in the Columbia River: Watch video
LOBO's launch in the Columbia River: Watch videoCourtesy CMOP

Here’s where LOBO, CMOP’s Land/Ocean Biogeochemical Observatory, comes in. WET Labs, Inc. senior research scientist Andrew Barnard, Ph.D. and CMOP researcher Joe Needoba, Ph.D. have teamed up to develop innovative methods to collect high quality, long-term data sets to improve scientific understanding of the vital signs of the Columbia River estuary.

Traditionally, any effort to monitor the “biogeochemistry” of a body of water requires scientists to board a ship, collect water samples, transport them back to a lab, and then measure the nutrients in the water. These trips are expensive and time-consuming and yet they only provide a “snapshot” of the estuary’s biogeochemical vital signs at the time of the shipboard sampling trip. Barnard and Needoba decided to approach the problem by utilizing an oceanographic monitoring platform made by Satlantic and customizing it with enhanced capabilities and improved water quality sensors.

LOBO is a water quality monitoring device that takes hourly measurements of nitrate, salinity, temperature, chlorophyll, turbidity, conductivity, depth, dissolved oxygen, oxygen saturation, and colored dissolved organic matter (CDOM).

LOBO is part of the Science and Technology University Research Network (SATURN), an end-to-end coastal margin observatory at CMOP. The data will provide the center with a better understanding of the ecosystem and composition of the water in the Columbia River and its estuary.
“What we are trying to do is establish a monitoring system that allow us to gain an understanding of the variability of the water quality, not only every hour but over weeks, months, and years,” said Needoba. “What this will tell us is how the estuary is behaving and responding to various forcing factors.”

LOBO is currently located in the Lower Columbia River and uses cellular telemetry to relay data every hour to a web site. The web interface lets anyone with and internet connection who is interested graph and download an individual variable or multiple variables, on a single day or over multiple days.

Sample reading from LOBO: The figure on the left shows a sample reading from LOBO of the levels of CDOM and dissolved oxygen from January 1 to January 5, 2009. The figure on the right plots hourly readings of water quality.
Sample reading from LOBO: The figure on the left shows a sample reading from LOBO of the levels of CDOM and dissolved oxygen from January 1 to January 5, 2009. The figure on the right plots hourly readings of water quality.Courtesy CMOP

The LOBO system will serve as an important biogeochemical data node within CMOP. “What we are doing in the Columbia River estuary is part of a larger project within CMOP to provide a framework of water quality measurements to scientists studying the estuary and coastal ocean,“ said Needoba.
The next step is to use the upcoming CMOP research cruises to verify that the data from the LOBO mooring is representative of the estuary as a whole. Needoba plans to use future research cruises to study the variability associated with different regions of the estuary and ensure that the aspects of the water quality his team measures in one specific site can be extrapolated to the entire estuary.

Barnard and his group at WET Labs, Inc. intend to expand the LOBO's biogeochemical monitoring capabilities by adding a new sensor to measurement dissolved phosphate in the water. “We will use our latest and greatest technology to create better capabilities for long term measurements and monitoring,” said Barnard.

Your Comments, Thoughts, Questions, Ideas

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posted on Sat, 05/01/2010 - 3:54pm
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posted on Thu, 08/12/2010 - 12:52am
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posted on Thu, 08/12/2010 - 12:59am

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