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Isotopes of carbonCarbon (C)
Additional recommended knowledge
Table
Notes
Palaeo-climate12C and 13C can be used as temperature tracers that explain ocean circulation. Plants find it easier to use the lighter isotopes (12C) when they convert sunlight and carbon dioxide into food , thus large blooms of plankton (free-floating organisms) draw large amounts of 12C into the oceans. If those oceans are stratified (layers of warm water near the top, and icy water deeper down) the water cannot circulate, thus when the plankton dies it sinks and carries 12C with them, making the surface layers relatively rich in 13C. Where the cold waters well up from the depths (North Atlantic) it carries the 12C with it. Thus, when the ocean was less stratified than today, there was plenty of 12C in the skeletons of surface-dwelling species. Other indicators of past climate include the prescence of tropical species, coral growths rings, etc. (Flannery, 2005)
References
See also
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Isotopes_of_carbon". A list of authors is available in Wikipedia. |
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