Historical News

Week of October 11 – October 17, 2020

Surface Mapping

Data were collected on October 15, 2020 while the R/V Monitor was underway collecting bacteria samples and performing vertical profiles in the Seekonk and Providence River estuaries. The chlorophyll concentrations were fair to good in the areas surveyed. From north to south, average chlorophyll concentrations were as follows: Seekonk River (6.06 µg/L), Upper Providence River (5.27 µg/L), Edgewood Shoals area (2.39 µg/L), Pawtuxet River area (3.67 µg/L), and Lower Providence River area (5.34 µg/L). Overall, chlorophyll ranged between non-detectable and 13.20 µg/L with an overall average of 4.74 µg/L.  The chlorophyll data from this date are presented in the map below:

Dataflow 2020-10-15 small.jpg

Week of October 11 - 17, 2020

R/V Monitor's Blog

​On Thursday, October 15th, the crew of the R/V Monitor was out on the upper Bay collecting bacteria and chlorophyll 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 Steve and Gerard collected the samples and data.  In addition, the temporary buoy located in Pawtuxet Cove was serviced this day. The sonde was swapped out with a freshly calibrated sonde.  The day began foggy but quickly cleared to a sunny and warm morning.  The wind and water were calm in the early morning, but as the wind steadily picked up, so did the chop on the water. The featured photo was taken from Gaspee Point looking north at Field's Point.  NBC's wind turbine blades can be seen peaking through the clearing fog.

10-15-20 Turbines.jpg 

 

Week of October 4 – October 10, 2020

Surface Mapping

Data were collected on October 7, 2020 while the R/V Monitor was underway collecting nutrient samples and performing vertical profiles in the Providence River estuary. The chlorophyll concentrations were fair to good in the areas surveyed. From north to south, average chlorophyll concentrations were as follows: Upper Providence River (7.06 µg/L), Edgewood Shoals area (4.79 µg/L), Pawtuxet River area (3.30 µg/L), and Lower Providence River area (4.44 µg/L). Overall, chlorophyll ranged between 0.50 µg/L and 12.50 µg/L with an overall average of 5.02 µg/L.  The chlorophyll data from this date are presented in the map below:

Dataflow 2020-10-07 small.jpg

Week of October 4 - 10, 2020

R/V Monitor's Blog

​The NBC was out on the Bay twice this week. First, on Tuesday, October 6th, the crew was out servicing the Bullock's Reach buoy. The sondes were swapped out with freshly calibrated sondes.  Sara captained the boat while monitoring professionals Mike and Daryll serviced the buoy. It was a beautiful sunny day with no wind and calm waters. On Wednesday, October 7th, a crew was collecting nutrients 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 again while monitoring professionals Jeff and Daryll collected the samples and data.  It was a partly cloudy day with a moderate wind out of the southwest and a chop on the water. A photo of a cargo ship at ProvPort was taken this day.

10-7-20 Cargo Ship.jpg 

Week of September 27 – October 3, 2020

Fixed Site Network

Phillipsdale Landing

Water quality was good this week at Phillipsdale Landing. Sondes were changed out for routine maintenance on September 29. Over the course of the week, 0.63 inches of rainfall was recorded, with the majority of this rainfall (0.54 in) occurring on September 30. Decreases in both surface and bottom salinity occurred following this mid-week rain event, driven by increased Blackstone River flows. Salinity averaged 21.2 ppt in surface waters and ranged from 12.2 ppt to 26.6 ppt. Bottom salinity averaged 35.2 ppt and ranged from 14.9 ppt to 28.9 ppt. Surface and bottom water temperatures averaged 20.9°C and 20.6°C, respectively. Surface temperatures ranged from 17.9°C to 22.2°C, while bottom temperatures ranged from 19.6°C to 22.1°C.

Dissolved oxygen (DO) remained above the hypoxia threshold (2.9 mg/L) in surface and bottom waters this week. Surface DO averaged 9.7 mg/L, with a minimum of 6.1 mg/L, and bottom DO averaged 6.7 mg/L, with a minimum of 3.1 mg/L. Chlorophyll concentrations were greater than concentrations measured last week. Surface chlorophyll averaged 69.6 ug/L and bottom chlorophyll averaged 41.3 ug/L; maximum chlorophyll concentrations were over 100 ug/L at both depths. Please note that tidal fluctuations and Blackstone River flow greatly influence water column salinity, temperature, and dissolved oxygen at this location.

Bullock Reach

Water quality was good this week at Bullock Reach. Over the course of the week, salinity decreased and water temperatures increased. Surface salinity averaged 29.5 ppt and ranged from 27.3 ppt to 30.5 ppt. Salinity at the mid depth averaged 30.3 ppt and ranged from 28.5 ppt to 30.9 ppt, while salinity in bottom waters averaged 30.1 ppt and ranged from 27.9 ppt to 31.6 ppt. Temperatures averaged 19.9°C, 19.7°C, and 19.3°C at the surface, middle, and bottom of the water column, respectively. Surface temperatures ranged from 18.6°C to 20.8°C, mid temperatures ranged from 18.5°C to 20.4°C, and bottom temperatures ranged from 17.7°C to 20.1°C.

Dissolved oxygen (DO) concentrations remained above the hypoxia threshold (2.9 mg/L) throughout the water column. Surface DO averaged 7.4 mg/L, while mid DO averaged 6.8 mg/L. Bottom DO averaged 6.2 mg/L, with a minimum of 5.4 mg/L. Chlorophyll concentrations generally increased over the course of the week. Surface chlorophyll averaged 8.4 ug/L, mid chlorophyll averaged 6.7 ug/L, and bottom chlorophyll averaged 3.7 ug/L. The maximum water column chlorophyll concentration was 27.7 ug/L, measured in surface waters on September 29.

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