GPHY 314 Chapter Notes - Chapter 5: Permafrost, Radiocarbon Dating, Carbon-12
29 Dec 2020
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Chapter 5: the carbon cycle: carbon dioxide the primary ghg emitted by human activities and policies to control modern climate change frequently focus on reducing our emissions of this gas. In warm tropics, can make up as much as 4% of atmosphere. In cold polar regions, may be only 0. 2: abundance decreases rapidly with altitude, and in stratosphere it typically makes up. In unpolluted air near surface, about 10-40 parts per billion: can reach 10ppm in stratosphere (1,000 times higher, absolutely necessary for life because it absorbs high-energy uv photons emitted by the. Himalayas and tibetan plateau: changing wind patterns brought heavy rainfall onto the newly exposed rock, and resultant chemical weather has been drawing down atmospheric carbon dioxide since then (until humans came along) If that happens, higher fraction of emissions will remain in atmosphere, and abundance of carbon dioxide will grow more rapidly. If they found it had one-fourth of carbon-14 of living plant, it would be.
