Lakes are stratified into three separate sections:
I. The Epilimnion
II. The Metalimnion
III. The Hypolimnion
The scales are used to associate each section of the stratification to their corresponding depths and temperatures. The arrow is used to show the movement of wind over the surface of the water which initiates the turnover in the epilimnion and the hypolimnion.

The epilimnion or surface layer is the top-most layer in a thermally stratified lake.

The epilimnion is the layer that is most affected by sunlight, its thermal energy heating the surface, thereby making it warmer and less dense. As a result, the epilimnion sits above the deeper metalimnion and hypolimnion, which are colder and denser. [1] Additionally, the epilimnion is typically has a higher pH and higher dissolved oxygen concentration than the hypolimnion.


Physical Structure

Properties

In the water column, the epilimnion sits above all other layers. The epilimnion is only present in stratified lakes. On the topside of the epilimnion it is in contact with air, which leaves it open to wind action, which allows the water to experience turbulence. Turbulence and convection work together to make waves which increases aeration.[2][3] On the bottom side of the epilimnion is the metalimnion, which contains the thermocline. The thermocline is created because of the difference in temperature between the epilimnion and the metalimnion. This is due to the fact that since the epilimnion is in contact with air and is above everything, it interacts with the sun and heat more, making it warmer than the layers below. In certain areas during the winter, the epilimnion will freeze over, cutting off the lake from being aerated directly.[4] Because of the epilimnion's susceptibility to air temperature change, it is often used to monitor warming trends. [5]

Lake Turnover and Mixing

In most stratified lakes, seasonal changes in the spring and fall air temperature cause the epilimnion to warm up or cool down. During these seasonal changes stratified lakes may experience a lake turnover. During this, the epilimnion and hypolimnion mix together and the lake generally becomes un-stratified, meaning it has a constant temperature throughout, and the nutrients are even throughout the lake.[6] There are different names for these turnovers based on how many times the lake does it in a year. Monomictic lakes flip only once, dimictic flip twice, and polymictic lakes flip more than twice. These turnovers can be based on seasonal differences, or can even happen daily.[7] In some cases this causes the lake to have inverse stratification, where the epilimnion has cooler water than the hypolimnion.

Chemistry

With the layer being open to air, the epilimnion usually has high amounts of dissolved O2 and CO2. This means the epilimnion is in a constant state of exchange of dissolved gases with the atmosphere. The epilimnion's thickness can be impacted by light exposure; more transparent lakes receive greater levels of light, leading to more stored energy in the water and a shallower epilimnion.[8] The epilimnion is also an area of concern for algal blooms due to phosphorus and nitrogen runoff from terrestrial sources. Wind erosion carrying soil particles can also introduce many different nutrients into the water as well, and those particles will enter the lake system through the epilimnion.

Biology

Because of its closeness to the surface, and being the area that receives the most sunlight, the epilimnion is a great home for phytoplankton, and other primary producers. Algal blooms are common in this layer as a result of large accumulations of nutrients. In response to large amounts of algae and phytoplankton being present, many fish species are common in this layer as they look for their source of food. Birds will often use the epilimnion as an area for rest and/or fishing. Many insects also make various uses of the epilimnion when it comes to nest making and habitat. Human interactions are also an important part of the biological part of the epilimnion. Some direct human interactions are recreational uses such as swimming, boating, or other activities. Other indirect interactions may come from sewage, runoff of agricultural fields, or land development. These are all able to affect properties of the epilimnion.[9]

References

  1. ↑ Haddout, Soufiane; Qanza, Hamid; Guennoun, Mohamed; Azidane, Hind; Karra, Rachid; Essaidi, Amine (31 July 2018). "Epilimnion and metalimnion thermal water temperature variables in Moroccan's Lakes using a one-dimensional fresh-water lake model". International Journal of River Basin Management. 18 (3): 321–333. doi:10.1080/15715124.2018.1498854. S2CID 134624630.
  2. ↑ Prats, Jordi; Danis, Pierre-Alain (2019). "An epilimnion and hypolimnion temperature model based on air temperature and lake characteristics". Knowledge & Management of Aquatic Ecosystems (420): 8. doi:10.1051/kmae/2019001. ISSN 1961-9502.
  3. ↑ Read, Jordan S.; Hamilton, David P.; Desai, Ankur R.; Rose, Kevin C.; MacIntyre, Sally; Lenters, John D.; Smyth, Robyn L.; Hanson, Paul C.; Cole, Jonathan J.; Staehr, Peter A.; Rusak, James A. (2012). "Lake-size dependency of wind shear and convection as controls on gas exchange". Geophysical Research Letters. 39 (9): n/a. Bibcode:2012GeoRL..39.9405R. doi:10.1029/2012GL051886. hdl:2440/72988. ISSN 1944-8007.
  4. ↑ Wilson, Harriet L.; Ayala, Ana I.; Jones, Ian D.; Rolston, Alec; Pierson, Don; de Eyto, Elvira; Grossart, Hans-Peter; Perga, Marie-Elodie; Woolway, R. Iestyn; Jennings, Eleanor (2020-11-24). "Variability in epilimnion depth estimations in lakes". Hydrology and Earth System Sciences. 24 (11): 5559–5577. Bibcode:2020HESS...24.5559W. doi:10.5194/hess-24-5559-2020. hdl:1893/31918. ISSN 1607-7938.
  5. ↑ Calderaro, Federico; Vione, Davide (17 June 2020). "Possible Effect of Climate Change on Surface-Water Photochemistry: A Model Assessment of the Impact of Browning on the Photodegradation of Pollutants in Lakes during Summer Stratification. Epilimnion vs. Whole-Lake Phototransformation". Molecules. 25 (12): 2795. doi:10.3390/molecules25122795. PMC 7356553. PMID 32560420.
  6. ↑ Pernica, Patricia; Wells, Mathew G.; MacIntyre, Sally (April 2014). "Persistent weak thermal stratification inhibits mixing in the epilimnion of north-temperate Lake Opeongo, Canada". Aquatic Sciences. 76 (2): 187–201. doi:10.1007/s00027-013-0328-1. ISSN 1015-1621. S2CID 15276847.
  7. ↑ Minor, Elizabeth C.; Austin, Jay A.; Sun, Luni; Gauer, Lance; Zimmerman, Richard C.; Mopper, Kenneth (August 2016). "Mixing effects on light exposure in a large-lake epilimnion: A preliminary dual-dye study: Dual-dyes in Lake Superior". Limnology and Oceanography: Methods. 14 (8): 542–554. doi:10.1002/lom3.10111.
  8. ↑ Fernandes Bezerra-Neto, José; Martins Gagliardi, Lauren; Pena Mello Brandão, Luciana; Silva Brighenti, Ludmila; Rodrigues Barbosa, Antônio (January 2019). "Effects of precipitation on summer epilimnion thickness in tropical lakes". Limnologica. 74: 42–50. doi:10.1016/j.limno.2018.10.004. S2CID 91377046. Retrieved 3 April 2022.
  9. ↑ Sadchikov, A. P.; Ostroumov, S. A. (December 2019). "Epilimnion, Metalimnion, and Hypolimnion of a Mesotrophic Aquatic Ecosystem: Functional Role of the Vertical Structure of the Reservoir Ecosystem in Terms of Hydrochemical and Biological Parameters". Russian Journal of General Chemistry. 89 (13): 2860–2864. doi:10.1134/S107036321913019X. ISSN 1070-3632. S2CID 211138964.
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