Lakes.

What if ice sank? How would the world be different as we know it?
Copyright © 2010 Ryan P. Murphy

Answer! The world would be a much different place.

Ice would form and then sink to the bottom
Ice would form and then sink to the bottom. On the next cold day / night more ice would form and sink. Copyright © 2010 Ryan P. Murphy

This process would continue until the lake was frozen solid.

What’s a Turnover?

What’s a Turnover? Answer: A dish made by folding a pastry over some filling.

What’s a turnover?

What’s a turnover? Answer: A turnover is when the team with the ball loses possession of the ball, which is then gained by the other team.

What’s a Turnover? Answer: Measures how long a fund holds on to the stocks it buys. The longer a mutual fund holds on to a stock and the less trading the fund does, the lower the turnover will be…

What’s turnover?

What’s turnover? Answer: The rate at which an employer gains and loses employees.

What’s Lake Turnover?

What’s Lake Turnover? Answer:

What’s Lake Turnover? Answer: A process where the layers that form in a lake are mixed seasonally.

Lake Turnover… Fall - Air temperatures drop, and the upper layers of water get cold. Wind and chop mix the upper layers as well These get colder, denser, heavier, and sink. Colder water displaces the water the lake bottom forcing the lower layers to the surface. Winter - Ice forms layer over water. Lake becomes layered Spring – Melting ice causes water to sink and mixes layers Summer – Warm temperatures cause layering .

Lake Turnover… Cold Wind
Fall - Air temperatures drop, and the upper layers of water get cold. Wind and chop mix the upper layers as well. These get colder, denser, heavier, and sink. Colder water displaces the water the lake bottom forcing the lower layers to the surface. Winter - Ice forms layer over water. Lake becomes layered Spring – Melting ice causes water to sink and mixes layers Summer – Warm temperatures cause layering . Cold Wind

Lake Turnover… Fall - Air temperatures drop, and the upper layers of water get cold. Wind and chop mix the upper layers as well. Upper water layer gets colder, denser, heavier, and sink. Colder water displaces the water the lake bottom forcing the lower layers to the surface. Winter - Ice forms layer over water. Lake becomes layered Spring – Melting ice causes water to sink and mixes layers Summer – Warm temperatures cause layering .

Lake Turnover… Fall - Air temperatures drop, and the upper layers of water get cold. Wind and chop mix the upper layers as well. Upper water layer gets colder, denser, heavier, and sink. Colder water displaces the water the lake bottom forcing the lower layers to the surface. Winter - Ice forms layer over water. Lake becomes layered. Spring – Melting ice causes water to sink and mixes layers Summer – Warm temperatures cause layering .

Lake Turnover… Fall - Air temperatures drop, and the upper layers of water get cold. Wind and chop mix the upper layers as well. Upper water layer gets colder, denser, heavier, and sink. Colder water displaces the water the lake bottom forcing the lower layers to the surface. Winter - Ice forms layer over water. Lake becomes layered. Spring – Melting ice causes water to sink and mixes layers

Lake Turnover… Fall - Air temperatures drop, and the upper layers of water get cold. Wind and chop mix the upper layers as well. Upper water layer gets colder, denser, heavier, and sink. Colder water displaces the water the lake bottom forcing the lower layers to the surface. Winter - Ice forms layer over water. Lake becomes layered. Spring – Melting ice causes water to sink and mixes layers Summer – Warm temperatures cause layering.

Please draw the following in your journal.
(About ½ Page)

Epilimnion

Epilimnion Thermocline

Note: Cold water can contain more DO (Dissolved Oxygen)
than warm water. Epilimnion Thermocline

than warm water. Epilimnion Thermocline More DO

than warm water. Epilimnion Less DO Thermocline More DO

than warm water. Epilimnion Less DO Thermocline More DO Low Oxygen because isolated from oxygen sources.

Epilimnion Thermocline Hypolimnion

Summer Stagnation in a Lake Epilimnion Thermocline Hypolimnion

Activity! Creating Lake Turnover in a Jar.

Teacher will have ice cold water (blue food coloring) Very hot water (red food coloring) Pour in cold water first. Then use Petri dish as cover and pour the hot on top of the cold without mixing the layers.

Teacher will have ice cold water (blue food coloring) Very hot water (red food coloring)

Teacher will have ice cold water (blue food coloring) Very hot water (red food coloring) Pour in cold water first.

Teacher will have ice cold water (blue food coloring) Very hot water (red food coloring) Pour in cold water first. Then use Petri dish as cover and pour the hot on top of the cold without mixing the layers.

Class Expectations You can show respect by… You can be responsible by…
Listening when the teacher or others are talking. One speaker at a time, please raise your hand. Please no cross-room conversations during work time. You can be responsible by… Staying organized and avoiding distraction. Staying focused on task completion. You can make good choices by… Attending class regularly Doing your best and never giving up. Be Safe! First, last, and always. Copyright © 2010 Ryan P. Murphy

Device to prevent mixing
Activity! Set-up of Lake Turnover. Device to prevent mixing Remove after. Hot Cold

Activity! Lake Turnover.
Please observe the layering of the Lake in summer (Start) Teacher will ask students to blow on top layers. (Early Fall) Teacher will add ice cubes (Early Winter) Same effect occurs with Spring

Possible Answer: Throughout the year, a lake goes through many changes. In the summer the lake has three distinct layers. Colder temperatures and wind in the fall mix the layers. After the ice forms across the lake, winter layers form. The melting ice mixes the layers in the spring. The lake returns to it’s summer layering when the temperatures warm. Copyright © 2010 Ryan P. Murphy

Possible Answer: Throughout the year, a lake goes through many changes. In the summer the lake has three distinct layers. Colder temperatures and wind in the fall mix the layers. Copyright © 2010 Ryan P. Murphy

Possible Answer: Throughout the year, a lake goes through many changes. In the summer the lake has three distinct layers. Colder temperatures and wind in the fall mix the layers. After the ice forms across the lake, winter layers form. Copyright © 2010 Ryan P. Murphy

Possible Answer: Throughout the year, a lake goes through many changes. In the summer the lake has three distinct layers. Colder temperatures and wind in the fall mix the layers. After the ice forms across the lake, winter layers form. The melting ice mixes the layers in the spring. Copyright © 2010 Ryan P. Murphy

Possible Answer: Throughout the year, a lake goes through many changes. In the summer the lake has three distinct layers. Colder temperatures and wind in the fall mix the layers. After the ice forms across the lake, winter layers form. The melting ice mixes the layers in the spring. The lake returns to it’s summer layering when the temperatures warm. Copyright © 2010 Ryan P. Murphy

Possible Answer: Throughout the year, a lake goes through many changes
Possible Answer: Throughout the year, a lake goes through many changes. In the summer the lake has three distinct layers. Colder temperatures and wind in the fall mix the layers. After the ice forms across the lake, winter layers form. The melting ice mixes the layers in the spring. The lake returns to it’s summer layering when the temperatures warm. Learn more about lake turnover at… Copyright © 2010 Ryan P. Murphy

Video Link! Lake Turnover (Optional)

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