210Pb in GEOSECS water profiles from the North Pacific

Details 210Pb in GEOSECS water profiles from the North Pacific 210Pb in GEOSECS water profiles from the North Pacific

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49..393n&link_type=abstract

Earth and Planetary Science Letters, Volume 49, Issue 2, p. 393-400.

Physics

8

Scientific paper

Ten GEOSECS profiles from the North Pacific have been analyzed for 210Pb. GEOSECS 226Ra data on the same profiles are used to calculate 210Pb excess or deficiency relative to secular equilibrium. The resultant profiles are divisible into a thermocline zone (<2000 m) showing an expected decrease with depth, a mid-water zone of about 2000 m showing small constant deficiencies with a zone of increasing deficiency to a bottom zone of about 1000 m having the highest deficiency virtually invariant with depth. The exponentially decreasing portion in the thermocline yields a ``diffusion'' coefficient of 3 cm2/s. The mid-water deficiencies yield box model residence times of 400 years northeast of Hawaii decreasing to 100 years at the most marginal stations.

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