ExcessHe in the Atlantic Ocean |
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Authors: | WJ JenkinsMA Beg WB Clarke |
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Institution: | Department of Physics, McMaster University Hamilton, Ontario, Canada; Institute of Oceanography, Dalhousie University Halifax, Nova Scotia, Canada; Scripps Institution of Oceanography, University of California San Diego, California, USA |
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Abstract: | 3/He4He measurements at two stations in the Atlantic show that the deep water (> 2 km) contains far less excess3He than our previous measurements have shown for the Pacific Ocean. The3/He4He ratio anomaly (relative to atmospheric3/He4He) is approximately 5% for the deep Atlantic compared to about 20% for the deep Pacific. The North Atlantic3He profile shows much more structure than the South Atlantic profile, with maxima observed at 500 m, 1900 m, and 3200 m. The maxima at 500 m and 1900 m are probably due to in situ tritium decay, whereas the 3200 m maximum cannot be due to tritium, and is probably due to leakage of3He into the Atlantic water from the mantle. It seems significant that maxima in the trace elements Cu, Zn and Fe have also been observed at 3200 m at this station by Brewer, Spencer and Robertson. |
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