|
Dimictic
A dimictic lake is a body of freshwater whose difference in temperature between surface and bottom layers becomes negligible twice per year, allowing all strata of the lake's water to circulate vertically. All dimictic lakes are also considered holomictic, a category which includes all lakes which mix one or more times per year. During winter, dimictic lakes are covered by a layer of ice, creating a cold layer at the surface, a slightly warmer layer beneath the ice, and a still-warmer unfrozen bottom layer, while during summer, the same temperature-derived density differences separate the warm surface waters (the epilimnion), from the colder bottom waters (the hypolimnion). In the spring and fall, these temperature differences briefly disappear, and the body of water overturns and circulates from top to bottom. Such lakes are common in mid-latitude regions with temperate climates. Examples of dimictic lakes * Lake Mendota * Lake Superior * Lake Simcoe * Lake Opeongo * Loch Lomon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holomictic
Holomictic lakes are lakes that have a uniform temperature and density from surface to bottom at a specific time during the year, which allows the lake waters to mix in the absence of Stratification (water), stratification. Details Holomictic lakes mix at least occasionally, in contrast to Meromictic lake, meromictic lakes. Most lakes on Earth are holomictic; meromictic lakes are rare, although they may be less rare than commonly thought. Amictic lake, Amictic lakes are sealed off by ice and never mix. There are four types of holomictic lakes: * polymictic lake, Polymictic (mixing many times annually) * Cold monomictic lake, Monomictic (mixing once annually; exhibiting negative stratification) * Warm Monomictic (mixing once annually; exhibiting positive stratification) * dimictic lake, Dimictic (mixing twice annually) * Oligomictic (mixing less than once annually) See also * Thermocline * References External links"Circulation: annual patterns of dimictic lakes" at Encycl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
