What is summer stratification. Explain.
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❤. SUMMER STRATIFICATION ❤
⭐. During summer , in temparate lakes , the formation of three layers of water is called summer stratification.
⭐. During summer the temperature of lakes rises upto 25degreesC . Hence ,periodic circulation of water takes place.
⭐. Then three types of layers are formed
✨.Epilimnion
✨. Thermocline
✨. Hypolimnion.
❤. EPILIMNION ❤
⭐. The upper ,warm oxygen rich layer of water having a temperature range of 21degreeC _ 25 degree C is called epilimnion.
❤. THERMOCLINE ❤
⭐. The below layer of epilimnion is called thermocline or metalimnion.Here , the temperature decreases at the rate of 1 degree C per meter.
❤. HYPOLIMNION ❤
⭐. The bottom layer where the temperature is about 7 degree C is called Hypolimnion.
⭐. In this layer , the water is stagnant ,relatively cool , nutrient rich , low oxygen content due to absence of photosynthetic activity.
❤. SUMMER STRATIFICATION IS FOLLOWED BY AUTUMN OVERTURN ❤
⭐. During Autumn the temperature of surface water falls to 4 degree C.
⭐. The water becomes heavy when the temperature is at 4 degree C . It sinks to the bottom . The bottom water comes to the surface with many nutrients. This circulation is called autumn (fall) over turn.
⭐. Due to autumn overturn uniform temperature and uniform distribution of nutrients and oxygen in the lakes take place.
Summer Stratification is the phenomenon that occurs when a water body like a lake, separates into two different layers water.
- During the summer season, temperature of the environment rises and thus the temperature of the lake rises too,
- The warmer distribution of the lake water rises to the top due to decrease in it's density. This upper layer is known as the "epilimnion".
- Epilimnion is concentrated with oxygen and it's temperature range is 21°C to 25°C.
- The colder layer at the bottom of the lake is called the "hypolimnion".
- This layer is not rich in oxygen and it's temperature ranges from 6°C to 7°C .
- Between the epilimnion and hypolimnion a zone called the "Thermocline" exists. In this layer the water temperature gradually decreases at the rate of 1°C per meter.
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