Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is...

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Lesson 5: The Dead Zone Chemical Oceanography

Transcript of Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is...

Page 1: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

Lesson 5: The Dead Zone

Chemical Oceanography

Page 2: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

Last class we learned about the carbon cycle

What is a biogeochemical cycle? What are the primary components of the carbon

cycle? Besides carbon, what other cycling elements are

important to ocean life?

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Page 3: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

Today we will learn about another element that cycles through Earth’s systems

1. Nitrogen is an important element to marine life.

2. An excess of nitrogen can indirectly lead to a reduction of dissolved oxygen in the water.

3. Low oxygen conditions can result in large marine die-offs.

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Page 4: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

Welcome to the Dead Zone!

The Dead Zone is a region in the Gulf of Mexico that does not support marine life in surface waters

Approximate location shown here

Dead zone

Photo: NASA

Dead zone

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Page 5: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

Welcome to the Dead Zone!

This region cannot support life because there is little to no dissolved oxygen (DO) in the water

Similar zones occur throughout the world

What do you think might cause them?

Too many nutrients like nitrogen can cause them

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Page 6: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

How does nitrogen get in the ocean?

Fertilizers

Wastewater

treatment

Factories

Nitrogen is part of the biogeochemical cycle.

Human activities like those in the picture cause nitrogen toenter the water. For example:agriculture, industryand water treatment.

Let’s see why too much nitrogen reduces DO…

Atmosphere

Photo: USGS

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Page 7: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

Too much nitrogen causes plankton blooms

Nitrogen is important to marine life Plankton, marine organisms that drift through the

ocean (e.g. fish larvae, diatoms), use this nutrient for reproduction

Excess nitrogen from humanactivities allows plankton populationsto grow very rapidly, a phenomenoncalled a plankton bloom

Plankton

Photo: NOAA7

Page 8: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

How do plankton blooms lead to dead zones?

When plankton die, they settle to the bottom and decompose

Bacteria use up oxygen as they decompose the plankton

DO

In hypoxic (low DO) or anoxic (no DO) environments, fish and other mobile organisms will leave

Those organisms that cannot or do not leave will die off

Plankton

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Page 9: Lesson 5: The Dead Zone Chemical Oceanography. Last class we learned about the carbon cycle What is a biogeochemical cycle? What are the primary components.

During the student activity, you will examine data from the ocean to analyze oxygen content

Dead zone activity

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