Historical News

Week of June 13 - 19, 2021

R/V Monitor's Blog

​On Wednesday, June 16th, 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 and Justin collected the samples and data. It was a partly sunny day with no wind in the morning, but picking up from the north in the afternoon. A chop on the water developed as the wind increased. The day's featured photo was taken at the Port of Providence.

6-16-21 ProvPort.jpg 

Week of April 18 - 24, 2021

Nutrients Sampling

Nutrient samples were collected from seven local and border river stations and six Bay stations on April 21, 2021; all Bay stations were sampled at the surface, while one station (Edgewood Shoal) was sampled at the surface and bottom. Additional Bay sites had been targeted for sampling, however safety concerns due to weather led to an early ending of the sampling day. A large storm delivered just over an inch of rain to the area five days prior to sampling, though the next four days were relatively dry.

Among the river stations sampled, the highest total nitrogen (TN), total dissolved nitrogen (TDN), and dissolved inorganic nitrogen (DIN) were all observed at the Ten Mile River at Roger Williams Ave. site. At this site, concentrations for TN, TDN, and DIN were 1,490 ppb, 1,650 ppb, and 1,157.8 ppb, respectively. The lowest concentrations were observed at the Coles River at Milford Rd. and Palmer River at Rt. 6 sites. At the Coles River site, concentrations measured 636 ppb (TN), 667 ppb (TDN), and 84.4 ppb (DIN). At the Palmer River site, concentrations measured 635 ppb (TN), 664 ppb (TDN), and 123.6 ppb (DIN). 

Among the Bay stations sampled, the highest surface nitrogen concentrations were observed at Phillipsdale Landing. At this site, TN, TDN, and DIN concentrations were 925 ppb, 785 ppb, and 508.8 ppb, respectively. The lowest surface TN (446 ppb), TDN (261 ppb), and DIN (115.0 ppb) concentrations were observed at Conimicut Point. Chlorophyll-a concentrations at the Bay sites declined since the previous sampling event, averaging 1.68 ug/L across all sites. The maximum result of 2.68 ug/L was measured in the sample from Conimicut Point.

Results from nutrient sampling on May 5 are pending analysis. The next scheduled sampling date is May 19. 

Week of April 4 - 10, 2021

Nutrients Sampling

Nutrient samples were collected from seven local river stations and seven Bay stations on April 7, 2021; all Bay stations were sampled at the surface and bottom. Weather conditions leading up to the sampling day were dry, though 0.66 inches of rainfall had fallen six days prior to sampling.

Among the river stations sampled, the highest total nitrogen (TN), total dissolved nitrogen (TDN), and dissolved inorganic nitrogen (DIN) were all observed at the Ten Mile River at Roger Williams Ave. site. At this site, concentrations for TN, TDN, and DIN were 1,425 ppb, 1,525 ppb, and 1,085.4 ppb, respectively (average of duplicate samples). The lowest nitrogen concentrations were observed at the Moshassuck River at Higginson Ave., at 420 ppb (TN), 491 ppb (TDN), and 236.0 ppb (DIN).

Among the Bay stations sampled, the highest surface nitrogen concentrations were observed at Phillipsdale Landing. At this site, TN, TDN, and DIN concentrations were 1,100 ppb, 1,080 ppb, and 742.6 ppb, respectively. The lowest surface TN (335 ppb), TDN (179 ppb), and DIN (47.5 ppb) concentrations were observed at Bullock Reach Buoy.  Chlorophyll-a concentrations at the Bay sites declined since the previous sampling event, averaging 3.20 ug/L across all sites. The maximum result of 7.83 ug/L was measured in the sample from Bullock Reach Buoy.

Results from nutrient sampling on April 21 are pending analysis. The next scheduled sampling date is May 5. 

Week of June 13 – June 19, 2021

Surface Mapping

Data were collected on June 16, 2021 while the R/V Monitor was underway collecting nutrient samples in the Seekonk and Providence River estuaries. The average chlorophyll concentrations were fair to poor in the areas surveyed. From north to south, average chlorophyll concentrations were as follows: Seekonk River (7.87 µg/L), Upper Providence River (10.67 µg/L), Edgewood Shoals area (14.81 µg/L), Pawtuxet River area (10.24 µg/L), and Lower Providence River (14.46 µg/L). Overall, chlorophyll ranged between 3.30 µg/L and 22.10 µg/L with an overall average of 11.79 µg/L. The chlorophyll data from this date are presented in the map below:

Dataflow 2021-06-16 small.jpg

Week of June 6 – June 12, 2021

Surface Mapping

Data were collected on June 9, 2021 while the R/V Monitor was underway collecting bacteria samples in the Seekonk and Providence River estuaries. The average chlorophyll concentrations were good to poor in the areas surveyed. From north to south, average chlorophyll concentrations were as follows: Seekonk River (6.45 µg/L), Upper Providence River (12.04 µg/L), Edgewood Shoals area (16.61 µg/L), Pawtuxet River area (11.56 µg/L), and Lower Providence River (17.92 µg/L). Overall, chlorophyll ranged between 1.28 µg/L and 29.31 µg/L with an overall average of 12.72 µg/L. The chlorophyll data from this date are presented in the map below:

Dataflow 2021-06-09 small.jpg

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