Chemical oceanography

Life timeline

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Axis scale: millions of years.
also see {{Human timeline}} and {{Nature timeline}}

Chemical oceanography is the study of ocean chemistry: the behavior of the chemical elements within the Earth's oceans. The ocean is unique in that it contains - in greater or lesser quantities - nearly every element in the periodic table.

Much of chemical oceanography describes the cycling of these elements both within the ocean and with the other spheres of the Earth system (see biogeochemical cycle). These cycles are usually characterised as quantitative fluxes between constituent reservoirs defined within the ocean system and as residence times within the ocean. Of particular global and climatic significance are the cycles of the biologically active elements such as carbon, nitrogen, and phosphorus as well as those of some important trace elements such as iron.

Another important area of study in chemical oceanography is the behaviour of isotopes (see isotope geochemistry) and how they can be used as tracers of past and present oceanographic and climatic processes. For example, the incidence of ¹⁸O (the heavy isotope of oxygen) can be used as an indicator of polar ice sheet extent, and boron isotopes are key indicators of the pH and CO₂ content of oceans in the geologic past.

See also

• Anoxic event - Anoxic sea water - Hypoxia (environmental)
• Climate change
• Dead zone (ecology)
• Global Ocean Data Analysis Project
• Oceanography
• Physical oceanography
• World Ocean Atlas

Bibliography

• Frank J. Millero. Chemical Oceanography, Third Edition. CRC, 2005. ISBN 0-8493-2280-4.
• Chemical Oceanography, Vol. 1- 10 (2nd Ed.) - J. P. Riley and G. Skirrow, eds, Academic Press (1975–1989).
• Riley, J. P. and Chester, R. Introduction to Marine Chemistry, Academic Press, 1971. ISBN 0-12-588750-7.