At what depth would you place the CCD in the North Atlantic Ocean?
5,000 m In the Indian Ocean and the Pacific, the CCD is typically found at depths between 3,500 and 4,500 m. In the North Atlantic and the eastern South Atlantic, the CCD occurs deeper than 5,000 m.
What affects the depth of the carbonate compensation depth?
The supply of tests raining down to the ocean floor depends on the productivity of surface waters. In areas of high productivity, the greater rate of supply lowers the CCD and carbonate particles occur in sediments at depths below the average ocean CCD. Nutrient availability, thus, is one important control on the CCD.
What is the approximate depth of the CCD in the ocean?
In today's oceans, the CCD is between 4 and 5 kilometers deep. It is deeper in places where new water from the surface can flush away the CO2-rich deep water, and shallower where lots of dead plankton build up the CO2.
What is the significance of the carbonate compensation depth CCD )? How might ocean acidification affect the CCD?
What is the significance of the carbonate compensation depth (CCD)? how might ocean acidification affect the CCD? The depth provided by the CCD gives us the threshold in which calcium carbonate is dissolved. Acidification could cause the CCD to rise and slower coral reef growth and production of calcium carbonate.
How does the depth of the CCD change with latitude?
The CCD is relatively shallow in high latitudes with the exception of the North Atlantic and regions of Southern Ocean where downwelling occurs. This downwelling brings young, surface water with relatively low concentrations of carbon dioxide into the deep ocean, depressing the CCD.
Why is the CCD deeper in the Atlantic?
This dramatic variation is due to differences in ocean chemistry. The Pacific has a lower pH and is colder than the Atlantic, so its lysocline and CCD are higher in the water column because the solubility of calcite increases in these conditions.
What factors can affect the CCD?
Calcium carbonate solubility increases with increasing carbon dioxide content, lower temperatures, and increasing pressure. Other factors that can influence the dissolution of calcium carbonate: organic coatings on the grains, size of the grain (smaller grains dissolve faster).
Will CCD rise or fall with global warming?
Therefore, the production of calcium carbonate will probably decline, although conversely global warming, increasing stratification and sea level rise may also stimulate increases in global calcification.
How does ocean acidification affect CCD?
As acidification reaches the deep ocean, the CCD will rise sharply, but carbonate compensation is likely to be only a secondary influence within this timescale. Large increases in sea level are likely as sea level slowly catches up with the changes in temperature.
Which of the oceans have the deepest CCD and why?
CCD is found deepest in the North Atlantic Ocean (50°N) at about 5,000 m moving upwards continuously in the water column to 3,000 m in the Atlantic sector of the Southern Ocean (60°S) and, in turn, CCD is found deepest in the Pacific sector of the Southern Ocean (60°S) at about 4,500 m moving upwards to 3,000 m in the …
What controls the depth of CCD?
The variation in the depth of the CCD largely results from the length of time since the bottom water has been exposed to the surface; this is called the "age" of the water mass. Thermohaline circulation determines the relative ages of the water in these basins.
What controls the depth of the CCD?
The variation in the depth of the CCD largely results from the length of time since the bottom water has been exposed to the surface; this is called the "age" of the water mass. Thermohaline circulation determines the relative ages of the water in these basins.
What happens beneath the CCD?
The calcite compensation depth (CCD) is the depth in the oceans where the rate of calcium carbonate material forming and sinking is equal with the rate the material is dissolving. Below the CCD no calcium carbonate is preserved—generally there is no CaCO3 beneath about 15,000 feet (4500 meters) (Figure 6.81).
What occurs below the calcium carbonate compensation depth quizlet?
the depth at which the rate of accumulation of calcareous sediments equals the rate of dissolution of those sediments. Below this depth, sediment contains little or no calcium carbonate.
How is the carbonate compensation depth CCD related to the worldwide distribution of calcareous oozes?
The carbonate compensation depth (CCD) is the dominant facies boundary on the deep-sea floor. It separates calcareous from noncalcareous sediments, with the calcareous deposits (“carbonate ooze”) restricted roughly to the shallower half of the deep-sea floor.
What conditions exist below the CCD quizlet?
Below the calcite compensation depth (CCD), physical conditions cause calcium carbonate to dissolve. Where is calcareous ooze most likely to be found in surface sediments in the ocean? Calcareous ooze is most likely to be found in relatively shallow areas with warm surface water.
How does the carbonate compensation depth CCD impact the deposit of marine sediment?
If the sea bed is above the CCD, bottom sediments can consist of calcareous sediments called calcareous ooze, which is essentially a type of limestone or chalk. If the exposed sea bed is below the CCD tiny shells of CaCO3 will dissolve before reaching this level, preventing deposition of carbonate sediment.
At what depth would you likely find calcareous ooze?
The CCD is usually found at depths of 4 – 4.5 km, although it is much shallower at the poles where the surface water is cold. Thus calcareous oozes will mostly be found in tropical or temperate waters less than about 4 km deep, such as along the mid-ocean ridge systems and atop seamounts and plateaus.
Under what conditions would you expect to find the greatest quantity of calcareous ooze on the ocean bottom?
Calcareous shells generally will not accumulate on the ocean floor when the water depth exceeds about 4,500 meters (around 15,000 feet). Calcareous ooze is found in cooler waters at depth around the world.
Which of the following conditions allows for calcareous ooze to be found beneath the CCD?
Which of the following conditions allows for calcareous ooze to be found beneath the CCD? The ooze accumulates above the CCD and then is covered before being transported to deeper depths by sea floor spreading.
Where would you expect to find a high concentration of calcareous ooze?
The CCD is usually found at depths of 4 – 4.5 km, although it is much shallower at the poles where the surface water is cold. Thus calcareous oozes will mostly be found in tropical or temperate waters less than about 4 km deep, such as along the mid-ocean ridge systems and atop seamounts and plateaus.
Where would you expect to find a high concentration of calcareous ooze quizlet?
Where do calcareous oozes exist on the seafloor? underneath areas where calcareous organisms live, above the CCD.
What conditions exist below the CCD?
Below the calcite compensation depth (CCD), physical conditions cause calcium carbonate to dissolve. Where is calcareous ooze most likely to be found in surface sediments in the ocean? Calcareous ooze is most likely to be found in relatively shallow areas with warm surface water.
Why is calcareous ooze found near the ridge?
The distribution of modern calcareous ooze is generally found along mid-ocean ridges and in low-latitude ocean basins. The reason for this occurrence is that most mid-ocean ridges are at a level higher than the CCD and that low-latitude ocean basins are typically warm and often not as deep as the CCD.
How does the depth of sediment change as you move away from mid-ocean ridges?
As you move away from the ridge spreading center the sediments get progressively thicker (see section 4.5), increasing by approximately 100-200 m of sediment for every 1000 km distance from the ridge axis.
What happens to the thickness of sediments further away from the ridge?
As you move away from the ridge spreading center the sediments get progressively thicker (see section 4.5), increasing by approximately 100-200 m of sediment for every 1000 km distance from the ridge axis.
How does the sediment closer to the mid-oceanic ridge compare to the sediment closer to the continent?
What is an undersea mountain range that forms at a divergent boundary? Q. How does sediment that is closer to a mid-ocean ridge compare to sediment that is farther away? It is larger.
What most likely happens to the thickness of the ocean sediments as you move farther from the mid-ocean ridge?
The newest, thinnest crust on Earth is located near the center of mid-ocean ridge—the actual site of seafloor spreading. The age, density, and thickness of oceanic crust increases with distance from the mid-ocean ridge.
Why do ocean water depths increase away from the mid-ocean ridges?
Why do ocean water depths increase away from the midocean ridges? (Check all that apply.) Older oceanic crust is denser and thus sits lower on the asthenosphere. The accumulation of sediments over time adds weight to the seafloor.
What happens to the depth of the seafloor moving away from a mid-ocean ridge?
As oceanic crust moves away from the shallow mid-ocean ridges, it cools and sinks as it becomes more dense. This increases the volume of the ocean basin and decreases the sea level.