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Biological carbon sequestration is the storage of carbon dioxide in soils, the ocean, and vegetation (such as grasslands or forests). There are different biological processes of sequestering carbon on land and in the ocean.
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Team Biological Carbon Sequestration Teachers
On land, carbon is sequestered by plants through photosynthesis. The carbon is then returned to the atmosphere through the respiration of consumers. Let’s look at this in more detail below.
The whole process of carbon entering and moving around the ocean is called the carbon pump. Phytoplankton sequester atmospheric carbon during photosynthesis in ocean waters. This carbon then transforms into terrestrial carbon or biological carbon before returning to the atmosphere.
Phytoplankton sequester carbon dioxide from the atmosphere through the process of photosynthesis. As this happens, they build their shells from calcium carbonate. The carbon in the atmosphere is transformed into biological carbon. Other organisms, such as zooplankton, then consume these organisms. As these consumer organisms respire, some carbon is returned to the atmosphere.
Can you remember what phytoplankton are? They are microscopic organisms that live in water.
When phytoplankton and other aquatic organisms die, they sink to the ocean floor. These organisms accumulate as sediment and eventually transform into sedimentary rock, which is decomposed by bacteria. This process returns carbon into the ocean in the form of dissolved organic carbon.
Thermohaline circulation
Thermohaline circulation is the global movement of water. Slight temperature changes can change the operation of both the thermohaline circulation and carbonate pump. Cold water sinks to the bottom of the ocean whilst warm water rises to the surface. Because warm Caribbean water passes the United Kingdom (UK) as it moves northward towards the poles, the UK is relatively warmer compared to other locations at the same latitude.
Here are two examples of landscapes that sequester biological carbon:
Mangroves found at tropical coastlines sequester 1.5 metric tonnes of carbon per hectare every year. Soils found in mangrove forests consist of layers of litter, humus, and peat, which contain over 10% carbon. These soils are submerged beneath the tidal water twice a day, making them anaerobic (without oxygen). Due to the lack of oxygen, the breakdown of biological material by biological decomposers takes a lot longer.
Tundra regions of the world have permanently low temperatures, so ancient carbon is permanently frozen in the soil because no microbe activity decays the material. Tundra regions are massive carbon stores, holding carbon for hundreds of thousands of years.
Example of a mangrove, pixabay
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What are the benefits of carbon capture and storage?
The benefits of carbon capture and storage include slowing down climate change (due to reduced CO2 emissions), generating power from stored CO2, and potential fuel creation from CO2.
How does carbon sequestration work?
Carbon sequestration works through the photosynthesis of plants, which capture the carbon to secure and store the carbon in soils and the ocean.
How does the biological carbon pump work?
The whole process of carbon entering and moving around the ocean is called the carbon pump. Phytoplankton sequester atmospheric carbon during photosynthesis in ocean waters. This transforms into terrestrial carbon or biological carbon before returning to the atmosphere. During this process, the phytoplankton build their shells from calcium carbonate. These organisms are then consumed by other organisms, such as zooplankton. As these consumer organisms respire, some of the carbon is returned to the atmosphere. When phytoplankton and other aquatic organisms die, they sink to the ocean floor. These organisms accumulate as sediment and eventually transform into sedimentary rock. They are then decomposed by bacteria, which returns carbon into the ocean in the form of dissolved organic carbon.
How does the biological pump affect the carbon cycle?
The biological pump affects the carbon cycle because it sequesters carbon from the atmosphere.
What is carbon sequestration in trees?
Carbon sequestration in trees is when the tree stores carbon as biomass through photosynthesis.
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