Although lake breezes frequently bring cooler weather to lakeside locations, especially in the spring, there are many days when they do not develop.
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We now have a micro (small) scale circulation — the lake breeze. This lake breeze that develops in the spring can cause a 30 degree difference in temperature over a few miles. It can oscillate back and forth, where you a warm one minute, but cold the next. We see this on a grand scale as well around the globe.
Its relatively warm water (warm compared with colder wintertime air temperatures) keeps temperatures over the lake and at the lakefront higher than inland readings. In the summer, however, lake water temperatures are usually cooler than inland air temperatures, and daytime readings at the lakefront will be lower.
The Profundal Zone or Hypolimnion (cold water region) can be found below the Euphotic Zone. This zone is located under the thermocline where the sunlight does not penetrate the water. Again, the size of this zone depends on the age and water clarity of the pond or lake.
Many lakes experience a turning of its water layers when the seasons change. In summer, the top of the lake becomes warmer than the lower layers. You've probably noticed this when swimming in a lake in summer - your shoulders feel like they're in a warm bath while your feet are chilled.
During the summer the lake absorbs energy, but the land reradiates energy to the atmosphere. Therefore, air over land is warmer than that over the water. In the winter the energy absorbed by the lake water is gradually released to the atmosphere, making the air over the water warmer than that over the land.
During the early morning hours, the land and the water start out at roughly the same temperature. On a calm morning, a given pressure surface will be at the same height above both the land and water. A few hours later, the sun's energy begins to warm the land more rapidly than the water.
The massive Lakes act like heat sinks that moderate the temperatures of the surrounding land, cooling the summers and warming the winters. The lakes also act like giant humidifiers, increasing the moisture content of the air. In the winter, this moisture contributes to heavy snowfall known as “lake effect” snow.
Lakes have layersWater temperatures also play a role in water density. Warm water is less dense meaning it is lighter and stays toward the top of the lake. The colder, heavier water is found at the bottom.
Typically, brown lakes are surrounded by forests or wetlands. Dense forests provide dark organic material that dissolves in lake water like a teabag. This dissolved organic material stains the water brown and shades the underwater world. Overall, brown water lakes tend to be light-limited.
The coldest lake in the world is Lake Baikal in Russia. It also happens to be the largest freshwater lake in the world. Lake Baikal is in Southern Siberia. The lake freezes during winter, becoming an ice lake.