Dataset of high-frequency key abiotic factors (temperature, oxygen, salinity) in the tropical Cayenne estuary (French Guiana)

Temperature, salinity and dissolved oxygen were collected over approximately four years (from January 1, 2020, to March 31, 2024) using three HOBO probes (U20L-01, U24-001 and U26-001). As part of their operational process, the three probes also recorded temperature (-2-36°C, ± 0.1°C at 25°C accuracy). Salinity (0–10,000 μS/cm, ±3% accuracy) and dissolved oxygen (0–20 mg/L, ±0.2 mg/L accuracy up to 8 mg/L) measurements were corrected to compensate for temperature automatically. To ensure consistency, all measurements from the three probes were resampled to a 20-minute time step by averaging the surrounding values within each interval. At each site, temperature readings from the three probes showed high similarity, allowing the creation of a single averaged temperature dataset per site. Aberrant values considered outside the expected environmental range (temperatures exceeding 37°C or below 23°C, oxygen concentrations greater than 10 mg·L⁻¹ or below 0 mg·L⁻¹, and salinities above 35 ppt or below 0 ppt), were removed from the data set.