All measurements were made with Eureka Manta Sub2 probes (www.waterprobes.com). The measurement interval was 30 minutes. All measurements were made in Mumford Cove, CT, ~ 0.5 meters above the sandy bottom. Deployment time of each sensor varied between 3-6 weeks. All probes were calibrated prior to deployment for salinity, pH, 100% air-saturated water oxygen. The probe was attached to a local subsurface buoy.
\npH: calibrated with 3-point, NIST certified buffers, accuracy +/- 0.1, precision: 0.01, automatic temperature correction
\nOptically Measured Dissolved Oxygen (HDO): calibrated with 100% air-saturated water
\nSalinity: Calibrated with FisherScientific Conductivity standard 50,000 uS/cm
Since April 2015, pH, DO, temperature, and salinity measurements have been taken in 30-minute intervals in Mumford Cove, CT, United States. This is a shallow cove that is typical for the area.
\nThis dataset includes records from April 14, 2015 to July 15, 2025.
\nA complete technical description of the pH, DO, Temp, depth, and salinity sensors can be found at http://www.waterprobes.com/#!water-quality-sensor-specifications-/c11g
\nMonitoring website: https://befel.marinesciences.uconn.edu/monitoring/
Data Processing:
\nQA/QC consisted of identifying and deleting salinity data that 'jumped' within a single 30 minute interval more than 1 salinity unit. pH was corrected for linear drift, using the post-calibration offset.
For data added in version 4, dated December 2022-12-09T13:30 to 2025-07-15T12:00 (local time), all salinity values <20 psu and > 35 psu were treated as out of range and deleted.
\nBCO-DMO Processing Notes:
\nVersion 1:
\n(version 1 includes data from April 2015 to June 2016)
\n- reformatted date to yyyy-mm-dd; added date/time column in ISO8601 format;
\n- replaced spaces with underscores in the location name;
\n- filled blank cells with \"nd\" (\"no data\").
Version 2:
\n(version 2 includes data from April 2015 to February 2020)
\n- 2020-March-20: appended data from second dataset submission (monitoringMC_02).
Version 3:
\n(version 3 includes data from April 2015 to December 2022)
\n- replaced dataset with the new version, which includes all previous data and extends the sampling period to December 2022;
\n- converted dates to ISO 8601 format and added a column for UTC time zone;
\n- renamed fields to comply with BCO-DMO naming conventions.
Version 4:
\n(version 4 includes data from December 2022 to July 2025)
\n- Imported the new data with original file name \"Set4 - 10.26008:1912:bco-dmo.659874.4.xlsx\" into the BCO-DMO system.
\n- Converted Datetime column to ISO 8601 format (EST) and removed the original Datetime, DATE, and TIME columns
\n- Renamed fields to match the same as v3.
\n- Added ISO Date-time column in UTC.
\n- Loaded the v3 data file, \"mumford_cove_monitoring_v3.csv\", into the BCO-DMO processing system.
\n- Concatenated the new data onto the previous data.
\n- Rounded lat column to 8 decimal places.
\n- Rounded pH column to 2 decimal places.
\n- Removed the pH_mV column.
\n- Saved the final file as \"659874_v4_mumford_cove_monitoring.csv\".