Carbon 14 measurements in surface water CO{sub 2} from the Atlantic, India, and Pacific Oceans, 1965--1994

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In the 1960s, thermonuclear bomb tests released significant pulses of radioactive carbon-14 ({sup 14}C) into the atmosphere. These major perturbations allowed scientists to study the dynamics of the global carbon cycle by calculating rates of isotope exchange between the atmosphere and ocean waters. A total of 950 ocean surface water observations were made from 1965 through 1994. The measurements were taken at 30 stations in the Atlantic Ocean, 14 stations in the Indian Ocean, and 38 stations in the Pacific Ocean. Thirty-two of the 950 samples were taken in the Atlantic Ocean during the R/V Andenes research cruise. {sup 14}C ... continued below

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117 p.

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Nydal, R.; Brenkert, A.L. & Boden, T.A. March 1, 1998.

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  • Nydal, R. Norwegian Inst. of Tech., Trondheim (Norway). Dept. of Physics
  • Brenkert, A.L.
  • Boden, T.A. Oak Ridge National Lab., TN (United States). Carbon Dioxide Information Analysis Center

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Description

In the 1960s, thermonuclear bomb tests released significant pulses of radioactive carbon-14 ({sup 14}C) into the atmosphere. These major perturbations allowed scientists to study the dynamics of the global carbon cycle by calculating rates of isotope exchange between the atmosphere and ocean waters. A total of 950 ocean surface water observations were made from 1965 through 1994. The measurements were taken at 30 stations in the Atlantic Ocean, 14 stations in the Indian Ocean, and 38 stations in the Pacific Ocean. Thirty-two of the 950 samples were taken in the Atlantic Ocean during the R/V Andenes research cruise. {sup 14}C was measured in 871 of the 950 samples, and those measurements have been corrected ({Delta}{sup 14}C) for isotopic fractionation and radioactive decay. The {Delta}{sup 14}C values range between {minus}113.3 and 280.9 per mille and have a mean value of 101.3 per mille. The highest yearly mean (146.5 per mille) was calculated for 1969, the lowest yearly mean value was calculated for 1990 (67.9 per mille) illustrating a decrease over time. This decrease was to be expected as a result of the ban on atmospheric thermonuclear tests and the slow mixing of the ocean surface waters with the deeper layers.

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117 p.

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OSTI as DE98054230

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  • Other Information: DN: Environmental Sciences Division publication number 4763

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  • Other: DE98054230
  • Report No.: ORNL/CDIAC--104
  • Report No.: NDP--057A
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/663505 | External Link
  • Office of Scientific & Technical Information Report Number: 663505
  • Archival Resource Key: ark:/67531/metadc706514

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  • March 1, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 3, 2016, 6:17 p.m.

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Nydal, R.; Brenkert, A.L. & Boden, T.A. Carbon 14 measurements in surface water CO{sub 2} from the Atlantic, India, and Pacific Oceans, 1965--1994, report, March 1, 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc706514/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.