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Estuaries
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Monitoring Estuaries |
temperature | depth | salinity | dissolved oxygen | turbidity | pH | nutrients | chlorophyll
The National Estuarine Research Reserve System or NERRS is a partnership program between NOAA and U.S. coastal states that protects more than one million acres of estuarine land and water. These estuarine reserves provide essential habitat for wildlife; offer educational opportunities for students, teachers and the public; and serve as living laboratories for scientists.
The health of every reserve is continuously monitored by the NERRS System-wide Monitoring Program or SWMP (pronounced swamp). SWMP measures changes in estuarine waters to record how human activities and natural events affect coastal habitats.
The NERRS SWMP uses automated data loggers to
monitor the temperature, depth, salinity, dissolved
oxygen, turbidity,
and pH of
each estuarys water. These variables are recorded every 30 minutes
at four stations in each of the 26 NERRS sites.
They are key indicators of water quality and environmental conditions
for the plants and animals that live in or use the estuary. The reserves
also sample the water for nutrients (nitrogen
and phosphorus) and chlorophyll on
a monthly basis.
Weather can have a major impact on water quality in estuaries. For example, rainfall can increase sediment runoff, which, in turn, influences dissolved oxygen, turbidity, pH and temperature. As part of SWMP, every reserve has a weather station that collects data every 15 minutes on temperature, relative humidity, atmospheric pressure, rainfall, wind speed and direction. Several reserves are able to send real-time data as they are collected directly to Web sites on the Internet.
These data have already helped scientists gain a better understanding of how environmental conditions fluctuate in estuaries. The SWMP data have been used to detect conditions related to oyster diseases, measure the recovery of estuaries after hurricanes, and evaluate restoration projects in estuaries.
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