Characteristic time scales of evaporation from a subarctic reservoir

Water bodies such as lakes and reservoirs affect the regional climate by acting heat sinks sources through evaporation of substantial quantities water over several months year. Unfortunately, energy exchange observations between deep atmosphere remain rare in northeastern North America, which has one highest densities world. This study characterizes dynamics turbulent fluxes analysing in-situ a compact dimictic reservoir (50.69° N, 63.24° W) located subarctic environment. The is characterized mean depth 44 m surface area 85 km2. Two eddy covariance (EC) systems, on raft onshore, were deployed from 27 June 2018 to 12 2022. thermal regime was monitored using two vertical chains thermistors. Results indicate annual rate 590 ± 66 mm, equivalent ≈51% precipitation, with 84% occurring at high August freeze-up late December episodic pulses. It difficult close balance because magnitude large time lag storage term. To circumvent this problem, we opted perform calculations for year that started first March, column its lowest point could thus be ignored. From December, monthly Bowen ratios increased near-zero negative values about 1.5. After September, due smaller vapour pressure deficits, latent steadily decreased until had complete ice cover. Opposite diurnal cycles sensible revealed during open period, peaking night afternoon.