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. Copyright © 2010 Ryan P. Murphy
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. Copyright © 2010 Ryan P. Murphy
Aquatic organisms would die, the planets climate would shift dramatically as the ice at the poles would accumulate. Life as we know it would change for the worse. Copyright © 2010 Ryan P. Murphy
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 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:
What’s Lake Turnover? Answer:
What’s Lake Turnover? Answer:
What’s Lake Turnover? Answer:
What’s Lake Turnover? Answer:
What’s Lake Turnover? Answer:
What’s Lake Turnover? Answer:
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… 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 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 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 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 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 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
Copyright © 2010 Ryan P. Murphy Epilimnion: The upper layer in a layered lake. Copyright © 2010 Ryan P. Murphy
Epilimnion Thermocline
Copyright © 2010 Ryan P. Murphy Thermocline: A layer within a body of water where the temperature changes rapidly with depth. Copyright © 2010 Ryan P. Murphy
Epilimnion Thermocline
Note: Cold water can contain more DO (Dissolved Oxygen) than warm water. Epilimnion Thermocline
Note: Cold water can contain more DO (Dissolved Oxygen) than warm water. Epilimnion Thermocline More DO
Note: Cold water can contain more DO (Dissolved Oxygen) than warm water. Epilimnion Less DO Thermocline More DO
Note: Cold water can contain more DO (Dissolved Oxygen) than warm water. Epilimnion Less DO Thermocline More DO Low Oxygen because isolated from oxygen sources.
Copyright © 2010 Ryan P. Murphy Cold water fish such as trout and salmon enjoy the colder temperatures and oxygen levels of the thermocline. Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Cold water fish such as trout and salmon enjoy the colder temperatures and oxygen levels of the thermocline. Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Cold water fish such as trout and salmon enjoy the colder temperatures and oxygen levels of the thermocline. Copyright © 2010 Ryan P. Murphy
Epilimnion Thermocline Hypolimnion
Copyright © 2010 Ryan P. Murphy Hypolimnion - The bottom and most dense layer of water in a lake. Non-circulatory and remains cold throughout the year Copyright © 2010 Ryan P. Murphy
Summer Stagnation in a Lake Epilimnion Thermocline Hypolimnion
Activity! Creating Lake Turnover in a Jar.
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.
Activity! Creating Lake Turnover in a Jar. Teacher will have ice cold water (blue food coloring) Very hot water (red food coloring)
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.
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.
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
Copyright © 2010 Ryan P. Murphy Activity! Lake Turnover Please sketch the following in your journal. Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Layers form under ice Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Summer Stagnation Fall Turnover Winter Stagnation Spring Turnover Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy Activity! Lake Turnover Question. Please describe in three sentences how a lake changes throughout the year. Copyright © 2010 Ryan P. Murphy
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
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. Copyright © 2010 Ryan P. Murphy
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
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
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
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… http://www.islandnet.com/~see/weather/elements/turnlakes.htm Copyright © 2010 Ryan P. Murphy
Copyright © 2010 Ryan P. Murphy You can now complete this question on your homework packet about lake turnover. Make sure to use color for this question. Copyright © 2010 Ryan P. Murphy
Video Link! Lake Turnover (Optional) http://www.youtube.com/watch?v=uSFSNTI67wc