Does rain make lakes warmer?

Rain may have a cooling effect on the lake surface by lowering the near-surface air temperature, by the direct rain heat flux into the lake, by mixing the lake surface layer through the flux of kinetic energy and by convective mixing of the lake surface layer.



People Also Ask

Rain may have an effect on the lake surface in four ways: (i) evaporative cooling of the near-surface air during precipitation, which induces an additional upward sensible heat flux from the lake towards the atmosphere; (ii) direct rain heat flux into the lake; (iii) mixing of the lake surface layer through the flux of ...

MORE DETAILS

Often, during hot summer months, the amount of dissolved oxygen in a lake becomes low, making fish inactive. Rain will aerate the surface water and often has a cooling effect, both of which can activate fish.

MORE DETAILS

Due to seasonal changes in sunlight intensity, surface water temperature begins to transition in the spring and fall. In the spring, the water surface warms.

MORE DETAILS

During rainy seasons, oxygen concentrations tend to rise in most surface waters because rain saturates with oxygen as it falls. More sunlight and warmer temperatures also increase plant growth and animal activity, which may increase or decrease DO concentrations and increase diurnal fluctuation.

MORE DETAILS

We call it the 48-hour rule, and it goes like this: In order to protect your health against recreational water illnesses, avoid contact with the water for at least 48-hours after a significant rain event. Think that sounds harsh? Some places suggest waiting up to 72 hours.

MORE DETAILS

All lakes are unique, so there's no standard equation or formula to say how much rain it takes to maintain or raise a lake's level. In theory, if a lake had perfectly vertical sides and a smooth bottom and had no inflows or outflows (like a pool) one inch of rain would raise the lake's level by one inch.

MORE DETAILS

Freshwater scientists know that storms can alter physical processes in lakes such as water flows from tributaries, mixing in the water column, sediment disturbance and water temperature.

MORE DETAILS

The colder water is, the more oxygen it can hold. As the water becomes warmer, less oxygen can be dissolved in the water. Salinity is also an important factor in determining the amount of oxygen a body of water can hold; fresh water can absorb more oxygen than salt water.

MORE DETAILS

During this cycle, the dissolved oxygen from the top layer of the lake moves to the bottom of the lake until ice forms across the surface. After the lake freezes, the only new dissolved oxygen is produced by underwater plants, so it has to be used sparingly.

MORE DETAILS

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.

MORE DETAILS