July 17, 2024
Surface Mapping
Surface chlorophyll data were collected on July 17, 2024 while the R/V Monitor was underway collecting bacteria samples in the Providence and Seekonk River estuaries. The average chlorophyll concentrations were categorized as poor in the Seekonk River and as fair in all other areas. Overall, chlorophyll ranged 2.29 to 57.17 µg/L with an average of 18.45 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.
July 10, 2024
Surface Mapping
Surface chlorophyll data were collected on July 10, 2024 while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuaries. The average chlorophyll concentrations were categorized as poor in the Seekonk River and Northern Providence River Channel and as good in all other areas. Overall, chlorophyll ranged 0.81 to 82.48 µg/L with an average of 19.85 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.
July 3, 2024
Surface Mapping
Surface chlorophyll data were collected on July 3, 2024 while the R/V Monitor was underway collecting bacteria samples in the Providence and Seekonk River estuaries. The average chlorophyll concentrations were categorized as poor in the Lower Providence River Area and as fair in all other areas. Overall, chlorophyll ranged from 2.27 to 52.87 µg/L with an average of 16.49 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.
Week of October 15 - October 21, 2023
Nutrients Sampling
Nutrient samples were collected from 14 river stations and 8 bay stations on October 18th. Edgewood Shoal was sampled at the surface and bottom; all other bay stations were sampled at the surface only. In the five days prior to sampling, there was only traces of rainfall recorded at T.F. Green.
Among the river stations sampled, the highest total nitrogen (TN), total dissolved nitrogen (TDN), and dissolved inorganic nitrogen (DIN) concentrations were observed at Ten Mile River @ Central Ave. (TN = 1,535 ppb, TDN = 1,640 ppb, DIN = 1,262 ppb, all averaged with duplicates). The lowest TN and TDN were observed at Moshassuck River @ Higginson Ave. (TN = 524 ppb, TDN = 586 ppb), while the lowest DIN was at Palmer River @ Rt. 6. (DIN = 110 ppb).
Among the bay stations sampled, the highest surface TN and TDN were observed at Phillipsdale Landing (TN = 1,150 ppb, TDN = 1,160 ppb), while the highest surface DIN was observed at Pawtuxet Cove (DIN = 689.5 ppb, average of duplicates). The lowest surface TN and TDN were observed at Conimicut Point (TN = 609 ppb, TDN = 606 ppb), while the lowest surface DIN was at Bullock Reach Buoy (DIN = 202.6 ppb). Chlorophyll a concentrations at the surface bay stations averaged 3.88 μg/L overall with a maximum of 7.75 μg/L at the India Point Park.
Week of October 1 - 7, 2023
Nutrients Sampling
Nutrient samples were collected from seven river stations and seven bay stations on October 4th. All bay stations were sampled at the surface and bottom. In the five days prior to sampling, there was 1.27 inches of rainfall recorded at T.F. Green.
Among the river stations sampled, the highest total nitrogen (TN), total dissolved nitrogen (TDN), an dissolved inorganic nitrogen (DIN) concentrations were observed at Moshassuck River @ Footbridge at Mill St. (TN=787 ppb, TDN = 873 ppb, DIN = 571.4 ppb). The lowest TN, TDN, DIN were observed at Moshassuck River @ Higginson Ave. (TN = 627 ppb, TDN = 614 ppb, DIN = 382.6 ppb).
Among the bay stations sampled, the highest surface TN, TDN, and DIN were observed at Phillipsdale Landing (TN = 1,060, TDN = 1,030 ppb, DIN = 596.4 ppb).The lowest surface concentrations were observed at Edgewood Yacht Club for TN (TN = 701.5 ppb, average of duplicates), at the Bullock Reach Buoy for TDN (TDN = 727 ppb), and at Conimicut Point for DIN (DIN = 312.3 ppb). Chlorophyll a concentrations at the surface bay stations averaged 1.32 μg/L overall with a maximum of 2.93 μg/L at the Bullock Reach Buoy.
