Oceanography The Official Magazine of
The Oceanography Society
Volume 23 Issue 02

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Volume 23, No. 2
Pages 112 - 114

The Volume of Earth's Ocean

Matthew A. Charette Walter H.F. Smith
Article Abstract

Despite playing a significant role in the global water cycle, ocean volume has not been re-examined in over 25 years. The main uncertainty associated with ocean volume is the mean ocean depth. The earliest studies tended to overestimate ocean depth due to undersampling of seamounts and ocean ridges. The advent of the echosounder in the 1920s and subsequent ship-borne technologies rapidly increased aerial coverage of the ocean; hence, over time there has been a gradual decrease in calculated mean ocean depth. Today, however, in situ measurements span only ~ 10% of the ocean’s surface area. Here, we use satellite altimetry data to estimate the ocean’s volume, which is lower by a volume equivalent to 500 times the Great Lakes or five times the Gulf of Mexico when compared to the most recent published estimates.

Citation

Charette, M.A., and W.H.F. Smith. 2010. The volume of Earth’s ocean. Oceanography 23(2):112–114, https://doi.org/10.5670/oceanog.2010.51.

References

Bache, A.D. 1855. Notice of earthquake waves on the western coast of the US., December 23 and 25, 1854; Ocean depth. Pp. 342–346 in Appendix No. 51, Report of the Superintendent of the Coast Survey.

Baumgartner, A., and E. Reichel. 1975. The World Water Balance. Elsevier, Amsterdam, 179 pp.

Becker, J.J., D.T. Sandwell, W.H.F. Smith, J. Braud, B. Binder, J. Depner, D. Fabre, J. Factor, S. Ingalls, S-H. Kim, and others. 2009. Global bathymetry and elevation data at 30 arc seconds resolution: SRTM30_PLUS. Marine Geodesy 32:4,355–4,371, doi:10.1080/01490410903297766.

Kossinna, E. 1921. Die Tiefen des Weltmeeres. Veroffentl. des Inst. fur Meereskunde, Heft 9. E.S. Mittler & Son, Berlin, 70 pp. 

Menard, H.W., and S.M. Smith. 1966. Hypsometry of ocean basin provinces. Journal of Geophysical Research 71:4,305–4,325.

Murray, J. 1888. On the height of the land and the depth of the ocean. Scottish Geophysical Magazine 1:1–41.

Sandwell, D.T., and W.H.F. Smith. 2009. Global marine gravity from retracked Geosat and ERS-1 altimetry: Ridge segmentation versus spreading rate. Journal of Geophysical Research 114, B01411, doi:10.1029/2008JB006008.

Shiklomanov, A., and A.A. Sokolov. 1983. Methodological basis of world water balance investigation and computation. Pp. 77–92 in New Approaches in Water Balance Computations. A. Van der Beken and A. Herrmann, eds, IAHS Publication no. 148.

Smith, W.H.F., and D.T. Sandwell. 1997. Global sea floor topography from satellite altimetry and ship depth soundings. Science 277:1,956–1,961.