Spatially coherent intermittent stratification and hypoxia in disparate sub-regions of an estuary.
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Spatially coherent intermittent stratification and hypoxia in disparate sub- regions of an estuary. Jamie Vaudrey & Jim Kremer Department of Marine Sciences, University of Connecticut Dan Codiga Graduate School of Oceanography, University of Rhode Island courtesy of R.L. Wilke Funded by the NOAA Coastal Hypoxia Research Program (CHRP), 2005
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courtesy of R.L. Wilke. Spatially coherent intermittent stratification and hypoxia in disparate sub-regions of an estuary. Jamie Vaudrey & Jim Kremer Department of Marine Sciences, University of Connecticut Dan Codiga Graduate School of Oceanography, University of Rhode Island. - PowerPoint PPT Presentation
Transcript of Spatially coherent intermittent stratification and hypoxia in disparate sub-regions of an estuary.
Spatially coherent intermittent stratification and hypoxia in disparate
sub-regions of an estuary.
Jamie Vaudrey & Jim KremerDepartment of Marine Sciences, University of Connecticut
Dan CodigaGraduate School of Oceanography, University of Rhode Island
courtesy of R.L. Wilke
Funded by the NOAA Coastal Hypoxia Research Program (CHRP), 2005
Field and Lab Work Supported By…
Kaitlyn Shaw (UCONN) – Profiler and Sonde maintenance and deployment, assistance with data processing
Gary Grenier, Dennis Arbige, Bob Dziomba (UCONN) – technical and mechanical support for the profilers
Dr. Candace Oviatt’s Lab group (URI) – boat rides to the field sites, maintained the deep water buoys
~ Edwin Requintina Sr., Heather Stoffel, Taylor Crockford, Leslie Smith
Autonomous Profiler - Grover
1 profile every 3 hours
deployment = 2 to 3 weeks
samples every 8 seconds
~ 12cm intervals
max depth = 5m
Bullock Reach
Field’s Point
Warwick Neck
Rumstick Neck
Northern Narragansett Bay, RI
2007, Rumstick Neck
2007, Rumstick Neck
2007, Rumstick Neck
2007, Rumstick Neck
Similar patterns seen at the stations…Dissolved Oxygen, July 2006
Similar patterns seen at the stations…Density, July 2006
Similar patterns seen at the stations…Dissolved Oxygen, August 2006
Similar patterns seen at the stations…Density, August 2006
Hypoxia linked to stratification, but…Is tidal stage (spring/neap) an adequate predictor of stratification?
Bottom DO vs. the Neap Tide Prediction
July
August
Sept.
Conclusions
• NNB shows a certain synchronicity to stratification / hypoxic events for the stations surveyed.
• Bottom water hypoxia is linked with stratification.
• There is a high probability that the water will be stratified during and just following a neap tide.
• However, hypoxia (and stratification) also occur at other stages of the monthly tidal cycle.
Rumstick July 2006
Warwick July 2006
Bullock Reach Aug 2006
Warwick Neck Aug 2006
Rumstick Neck Aug 2006
Warwick Neck Sept 2006
Rumstick Neck Sept 2006
Field’s Point Sept 2006
