This dataset contains chlorophyll-a (ug/L) predictions for 4 high-altitude lakes in the Sierra Nevada Mountain Range, Spain. Predictions were made using a simple linear regression model with field sample chlorophyll-a as the dependent variable, and the following Sentinel-2 derived spectral index as the independent variable: B3 - (B4+((B2-B4)*((665-560)/(665-490))) Prediction maps are included as GeoTiffs and NetCDF files. Sentinel-2 data were atmospherically corrected using the following algorithms: - ACOLITE (Vanhellemont & Ruddick, 2018) - 6SV (Vermote et al. 2006)

The data is for the Braila Islands LTSER site (LTER_EU_RO_006) recorded at Braila Naval Base (BN) for the period 2014-2018 using YSI Exo 2 and BBE Moldaenke Flourobprobe sampling equipment

This dataset includes Chlorophyll a concentration in μg/L. Measurements of Chl a were made on discrete water samples collected monthly in the upper 20 meters layer at sampling station Ghiffa (45°58’30’’N; 8°39’09’’E) from January 1984 to December 2018. Chl a measurements derived by spectrophotometric technique in the period from January 1984 to December 2009, while from January 2010 to December 2018 measurements derived from vertical profiling instrument (FluoroProbe).

Long-term monitoring of chlorophyll-a, ammonium, dissolved total nitrogen, nitrate, nitrite and phosphate concentrations in the water column at Sozopol, Bulgaria (2013-2021).

Monitoring of chlorophyll-a, ammonium, dissolved total nitrogen, nitrate, nitrite and phosphate concentrations in the water column in Burgas Bay, Bulgaria (2009-2011).