Oceans of change

Article Abstract:

Strontium isotope ratios in sea floor sediment deposits have recorded continental chemical weathering during the ice ages as have sedimentary germanium/silicon ratios. Both these indicators can be used to posit glacial to interglacial climatic changes. However, the two records do not present the same image of ocean composition, creating contradictory climatic pictures. The ocean is a constantly changing environment which is influenced by many sources, especially rivers that deposit most of the sediment and that may have caused the differences.

Marine sediments

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Paleoclimate: When the world turned cold

Article Abstract:

The biotic and climatic changes in central Asia and North America during the early Oligocene are described, implicating the reducing levels of atmospheric carbon dioxide as a main factor for changes in both hemispheres. The analysis has implied that a global forcing agent, such as declining concentrations of atmospheric greenhouse gases, has played a vital role in triggering the build-up of Antarctic ice, but the links between the climate changes and global forcing has remained unresolved.

Science & research, Antarctica, Environmental aspects, Oligocene Epoch

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