Carbon Cycle. Greenhouse Gases and the Atmosphere Certain gases in the atmosphere are good at absorbing and trapping heat. We refer to these at greenhouse.

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Presentation transcript:

Carbon Cycle

Greenhouse Gases and the Atmosphere Certain gases in the atmosphere are good at absorbing and trapping heat. We refer to these at greenhouse gases (GHG). These gases, make up a small segment of our atmosphere (1%) but have a big impact. Carbon dioxide (CO 2 ) Water vapor (H 2 O) Methane (CH 4 ) Nitrous oxide (N 2 O) F-gases (HCFCs, PFCs, and SF 6 ) Water Vapor is the most important GHG accounting for 2/3 of all heat trapped by greenhouse gases. But, its levels have remained relatively stable over the years.

Carbon Dioxide Carbon Dioxide makes up a very small part of the atmosphere, less than 1%. Human activity has caused measureable changes in the levels of CO 2 in the atmosphere. The majority of scientists agree that even small changes have been enough to tip the climate balance. So let’s explore carbon…

Carbon Carbon is an abundant element not only on Earth, but also in the sun, stars, comets, and in the atmospheres of other planets. With four electrons in the outmost energy level, carbon easily bonds with other elements. In fact, there are close to 10 million carbon compounds! Carbon is a key element in many greenhouse gases such as CO 2, methane, and carbon monoxide.

Graphic courtesy of IPCC

Carbon Cycle Carbon cycles between reservoirs or sinks in the Carbon Cycle. The lithosphere stores the most carbon, some of which is found in fossil fuels. The Hydrosphere is the second largest reservoir, followed by the atmosphere, and then the biosphere.

The Atmosphere A smaller amount of carbon is stored in the atmosphere The only reservoir that exchanges significant amounts of carbon directly with all of the others

The Biosphere One of the smallest reservoirs Includes all things that are living, were alive a short time ago, or are derived from living organisms Carbon in this reservoir is found mainly in the form of carbohydrates and proteins in both living and decaying organisms

The Hydrosphere Second largest reservoir of carbon Most of the carbon in this reservoir is found in the world’s oceans, but also in fresh water sources A subsystem of this reservoir includes marine plants and animals

The Lithosphere Largest carbon reservoir. Carbon is found primarily in rocks and minerals Carbon is also found in the form of fossil fuels: petroleum, natural gas, and coal Prior to the Industrial Revolution carbon left the lithosphere slowly through weathering and volcanism (natural processes)