Lake Piburg - Long term physico-chemical trends

Data Sets column descriptions:

----------------------------------------------------------------------PIB - Olszewski volume output (1979-1995):year - year (character)month - month (character)output_l/s - water discharge by the tube in l/s (numeric)temp_c - temperature of the water output by the tube in degrees celsius (numeric)

----------------------------------------------------------------------PIB - Olszweski Output Physico-Chemical Datadate - date (character)year - year (character)month -  (numeric)day - (numeric)temp - temperature in degrees Celsius (numeric)conductivity - Conductivity measured in situ in µS/cm (numeric)conductivity_lab - Conductivity measured in water samples taken to the laboratory in µS/cm (numeric)pH - pH measurement  (numeric)no3 - nitrate concentration in mg/L  (numeric)so4 - sulphate concentration in mg/L  (numeric)nh4_n_phot - ammonium concentration in µg/l  (numeric)TP - total phosphorus concentration in µg/l  (numeric)DP - dissolved phosphorus concentration in µg/l  (numeric)DN - dissolved phosphorus concentration in µg/l  (numeric)

----------------------------------------------------------------------PIB - Physico-Chemical Datadate - posixt object (UTC)year - year  (numeric)month -  (numeric)day - (numeric)depth - depth in m (numeric)temp - temperature in degrees Celsius (numeric)TP - total phosphorus concentration in µg/l  (numeric)oxygen - oxygen concentrations in mg/L  (numeric)N_NO3 - nitrate concentration in mg/L  (numeric)NH4_N - ammonium concentration in µg/l  (numeric)SO4 - sulphate concentration in mg/L  (numeric)DN - dissolved phosphorus concentration in µg/l  (numeric)chla - chlorophyll-a concentration in µg/l  (numeric)DP - dissolved phosphorus concentration in µg/l  (numeric)pH - pH measurement  (numeric)volume - volume of the water layer at the respective depth in m^3. For example, the value at 2 meters depth, is the total volume between 1.5 m and 2.5 m depth. (numeric)depth_surface_area - surface area at a respective depth in m°2(numeric)schmidt_stability - daily Schmidt-Stability for the lake in J/m^2 (numeric)

----------------------------------------------------------------------PIB - Stratification Durationyear - year (character)n_days - duration of summer stratification in days (numeric)

----------------------------------------------------------------------PIB - TP Inflowdate - posixt object (UTC)year - year (character)month -  (numeric)day - (numeric)tp_µg/L - total phosphorus concentration in µg/l  (numeric)