Artigo Revisado por pares

Ocean nutrient distribution and oxygenation: Limits on the formation of warm saline bottom water over the past 91 m.y.

1991; Geological Society of America; Volume: 19; Issue: 7 Linguagem: Inglês

10.1130/0091-7613(1991)019 2.3.co;2

ISSN

1943-2682

Autores

Timothy D. Herbert, Jorge L. Sarmiento,

Tópico(s)

Geology and Paleoclimatology Research

Resumo

Research Article| July 01, 1991 Ocean nutrient distribution and oxygenation: Limits on the formation of warm saline bottom water over the past 91 m.y. Timothy D. Herbert; Timothy D. Herbert 1Geological Research Division, Scripps Institution of Oceanography, La Jolla, California 92093-0215 Search for other works by this author on: GSW Google Scholar Jorge L. Sarmiento Jorge L. Sarmiento 2Program in Atmospheric & Oceanic Sciences, Princeton University, Princeton, New Jersey 05844 Search for other works by this author on: GSW Google Scholar Geology (1991) 19 (7): 702–705. https://doi.org/10.1130/0091-7613(1991)019 2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Timothy D. Herbert, Jorge L. Sarmiento; Ocean nutrient distribution and oxygenation: Limits on the formation of warm saline bottom water over the past 91 m.y.. Geology 1991;; 19 (7): 702–705. doi: https://doi.org/10.1130/0091-7613(1991)019 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract It has been proposed that deep-water formation in the oceans would be quite different during geologic intervals with reduced equator to pole temperature gradients. Salinity, rather than temperature, differences might drive the deep-ocean circulation. Saline water would tend to form at subtropical latitudes where evaporation exceeds precipitation. We point out a likely consequence of warm saline bottom-water formation on ocean chemistry—the tendency to drive the ocean toward anoxia. This effect is not due to the previously noted lower oxygen solubility with increasing ocean temperature, but rather to the increased efficiency with which plankton will extract nutrients from convecting waters at low latitudes. The present ocean nutrient content is sufficient to induce deep-water anoxia if circulation were to change, yet anoxia is rare in the paleoceanographic record. A simple ocean chemical model makes explicit the tradeoffs between mean ocean nutrient content and circulation parameters that will satisfy the geologic observations of an oxygenated ocean since the mid-Cretaceous. Barring decreases of ocean phosphate on the order of 30%-50%', deep-water formation at high latitudes was a major source of ocean ventilation in the warmer past. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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