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During the summer months in the Northern Hemisphere, plants undergo photosynthesis at a higher rate, which leads to a decrease in CO2 levels as they absorb more carbon dioxide from the atmosphere for growth.

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Why does the level of carbon dioxide in the atmosphere rises slightly in the summer and falls in the winter?

In a typical year the levels are high in May and low in October.The Northern Hemisphere has much more land for vegetation to grow on compared to the Southern Hemisphere. Carbon dioxide (CO2) builds up slowly during the northern winter, when trees and plants are dormant. Then in May everything begins to grow, and CO2 is taken out of the atmosphere, so the levels start coming down. In October and November vegetation stops growing, and in its dormant state it stops absorbing CO2, so the carbon in the atmosphere increases. These levels go up and down like this every year.The readings for 1958, 1959 and 1960 show this:1960: May: 320.5 ppm: October: 314.5 ppm1959: May: 320.0 ppm: October: 313.5 ppm1958: May: 318.0 ppm: October: 313.0 ppmPpm means parts per million, so 320 ppm is the same as 0.032 percent (per hundred).The recent readings for May are:2012: 396.78 ppm2011: 394.35 ppm2010: 393.22 ppm2009: 390.18 ppmSee the graph at the link below.


Why do CO2 levels drop during spring and summer months?

During spring and summer months, CO2 levels drop because plants undergo photosynthesis, which involves taking in CO2 from the atmosphere to produce oxygen and glucose. This process helps to reduce the amount of CO2 in the air.


What do sea levels do during an ice age?

During an ice age, sea levels typically drop because a significant amount of water becomes locked up in glaciers and ice sheets on land. As the ice sheets expand, they draw water from the oceans, causing sea levels to decrease.


Why were sea levels low during the ice age?

During the ice age, a significant amount of water was locked up in glacial ice, causing sea levels to drop. This resulted in more water being stored on land in the form of ice sheets, which led to lower sea levels globally.


What will happen in the next ice age?

Climate will get cooler and drier, starting at the poles and creeping toward the tropics with time. Sea levels shall fall and forests dry away, giving place to desert and grasslands. With some millenia, big ice sheets could form over northern latitudes, starting at Quebec and Scandinavia and growing until they covered much of Canada and northern Europe.

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