Historical News

Week of July 10 - 16, 2022

Nutrients Sampling

Nutrient samples were collected from thirteen local and border river stations and one bay station (Phillipsdale Landing) on July 13, 2022; an additional six bay stations were sampled on July 14, 2022. Bay sampling was delayed due to a small craft advisory in Narragansett Bay. Each of the bay stations were sampled at the surface and bottom. In the five days prior to sampling, there were trace amounts of precipitation recorded at T.F. Green. 

Among the river stations sampled, the highest total nitrogen (TN), total dissolved nitrogen (TDN), and dissolved inorganic nitrogen (DIN) were observed at Coles River at Milford Road. At this site, TN, TDN and DIN were 1,530 ppb, 1,580 ppb, and 1,321 ppb respectively. The lowest TN (549 ppb) was observed in the samples Moshassuck River at Higginson Ave. The lowest TDN (323 ppb, average of duplicates) and lowest DIN (30 ppb, average of duplicates) were observed at the Taunton River at Berkley Bridge.

Among the bay stations sampled, the highest surface TN was observed in the samples from Pawtuxet Cove. Duplicate samples at this site averaged 1,125 ppb TN, 1,015 ppb TDN, and 752 ppb DIN. The lowest surface TN (376 ppb), TDN (174 ppb) and DIN (13 ppb) were observed at Conimicut Point. Chlorophyll a concentrations at the bay stations decreased from the previous sampling event, averaging 6.85 ug/L across all sites. The maximum result of 11.97 ug/L occurred at Bullock Reach Buoy.

Results from nutrient sampling on July 27, August 9-10, and August 24 are pending analysis. The next scheduled sample date is September 7.

Week of September 11 - 17, 2022

Water Column Clarity

​Water clarity was measured at eight locations in the Providence River and Seekonk River estuaries on September 14, 2022. Rainfall totaling 0.68 inches was recorded at TF Green in the five days prior to the survey. Secchi depth averaged 2.4 meters, compared to 1.8 meters on the previous survey (September 7). The lowest clarity this week (2.1 meters) was measured at Pomham Rocks, while the greatest clarity (2.9 meters) was measured at Conimicut Point. There was no clear north-to-south gradient in water clarity among the sites this week. ​

Week of September 11 - 17, 2022

R/V Monitor's Blog

​On Wednesday, September 14th, the crew of the R/V Monitor was out on the upper Bay collecting bacteria samples, taking Secchi Disk and Par sensor water clarity measurements, conducting water column profiles using the Seabird instrument, and conducting real-time surface mapping of water quality parameters, including dissolved oxygen, chlorophyll, water temperature, salinity, and pH, all in an effort to document water quality improvements associated with NBC construction projects. Jeff captained the boat while monitoring professionals Sara, Gerard and Jeffrey collected the samples and data. It was a sunny day with a persistent wind out of the west, and choppy waters. The featured photo was taken inside  the hurricane barrier with a southward view.

9-14-22.jpg 

 

Week of September 11 – September 17, 2022

Surface Mapping

​Data were collected on September 14, 2022, while the R/V Monitor was underway collecting bacteria samples in the Providence and Seekonk River estuaries. The average chlorophyll concentrations were good in the areas surveyed. From north to south, average chlorophyll concentrations were as follows: Seekonk River (2.79 µg/L), Upper Providence River (2.96 µg/L), Edgewood Shoals area (4.09 µg/L), Pawtuxet River area (3.14 µg/L), and Lower Providence River (3.25 µg/L). Overall, chlorophyll ranged between 0.57 and 8.83 µg/L with an overall average of 3.18 µg/L. The chlorophyll data from this date are presented in the map below:

Dataflow 2022-09-14_small.jpg


Week of September 4 - 10, 2022

R/V Monitor's Blog

​On Wednesday, September 7th, the crew of the R/V Monitor was out on the upper Bay collecting nutrients and plankton samples, taking Secchi Disk and Par sensor water clarity measurements, conducting water column profiles using the Seabird instrument, and conducting real-time surface mapping of water quality parameters, including dissolved oxygen, chlorophyll, water temperature, salinity, and pH, all in an effort to document water quality improvements associated with NBC construction projects. Sara captained the boat while monitoring professionals Daryll, Gerard and Steve collected the samples and data. The day was cloudy with a strong wind from the northeast. There was a strong tidal outflow and a heavy chop on the water. The featured photo shows a cargo ship in the upper Bay.

9-7-22 Cargo Ship.jpg 

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