Data description : Data are in situ profiles of dissolved oxygen concentrations, water temperature, Secchi depths and total phosphorus concentrations recorded in Lakes Geneva and Annecy. The dataset consists in monthly to bi-monthly profiles for the periods 1957 to 2016 and 1966 to 2016 for Lakes Geneva and Annecy respectively. Data acquisition : Temperature data were collected from the deepest point in the lakes. Temperature measurements were measured manually using thermometers and multiparameters probes. In Lake Geneva, water temperature was measured manually with a thermometer until 1990 from discrete depths of 5 to 10 meter intervals through 50 meter depth and approximately 50-meter intervals for the rest of the water column. After 1990 various multiparameter probes were used for temperature measurements, Meerestechnik Elektronik (1991-2001), CTD 90 (2002-2007), CTD 90M (2008-2011, 2013), and RBR (2012). In Lake Annecy, various multiparameter probes, including Meerestechnik Elektronik (1991-2001), CTD 90 (2003-2005), CTD 90M (2008-2011, 2013), and RBR (2012) were used for temperature measurements at depth intervals between 0.01 and 1.8 meters. Temperature profiles were measured in Lake Bourget at depth intervals between 0.01 and 10 meters using various multiparameter probes, including ISMA probe DNTC (1984-1985), Meerestechnik Elektronik ECO 236 (1986-1998), CTD SBE 19SeaCAT Profiler (1992-2002), and CTD SBE 19plus V2 SeaCAT (2003-2013).

SI-OLA si-ola.inrae.fr, 2019