Hydrophysical factors affecting the distribution of chlorophyll "a" in a small lake

In recent years due to climate warming algal blooms have been observed in some boreal lakes during summer and autumn months, which reduces the quality of water. We studied distribution chlorophyll "a" Lake Kroshnozero (North-western Russia) 2021 2022. This lake has used for fisheries more than 50 years, currently there is a trout farm there. influence temperature, turbidity transparency water on "a". Low limits photosynthesis upper 1.5-2.5 m layer. The stratification transfer algae cells along column, therefore, deeper 2-3 m, concentration decreases sharply. Water exchange causes suspended solids from southeastern basin, where located, northwestern one, maximum concentrations are observed. Additional stimulation shallow rapidly basin can occur supply nutrients catchment area. Features bathymetry contribute formation bottom oxygen deficiency near farm.