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\subsection{Arctic Lake (Ar)}  Artic lakes are located at the Arctic Polar Circle. Their mean surface temperature is around 3ºC and their maximum is near to 9ºC.  In general, Arctic lake systems are classified as oligotrophic due to their low primary production, represented in chlorophyll values of 0.8-2.1 mg/m3. The lake’s water column, or limnetic zone, is well-mixed; this means that there are no stratifications (layers with different temperatures). During winter (October to March), the surface of the lake is ice covered. During summer (April to September), ice melts and the water flow and evaporation increase, as shown in Figure **. Consequently, the two climatic periods (winter and summer) in the Arctic region cause a typical hydrologic behavior in lakes as the one shown in Figure **.  This hydrologic behavior influences the physiochemical subsystem of the lake.