226Ra in the Pacific Ocean

Details 226Ra in the Pacific Ocean 226Ra in the Pacific Ocean

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49..267c&link_type=abstract

Earth and Planetary Science Letters, Volume 49, Issue 2, p. 267-292.

Computer Science

9

Scientific paper

A total of 29 vertical Ra profiles has been measured from the Pacific as part of the GEOSECS program. These profiles are located on an east-west section along ~30°N, and a north-south section, close to the western boundary of the major basins in the western Pacific. Profiles from the northeast Pacific show a deep Ra maximum, with an excess concentration relative to the potential temperature and salinity. This maximum extends westward in the direction with decreasing Ra content, and finally vanishes completely in the northwest Pacific near Japan.
Ra profiles along the western boundary show a mid-depth maximum around 3 km and a near-bottom minimum due to southward intrusion of the high-Ra Pacific Deep Water and a northward spreading of the low-Ra Antarctic Bottom Water. The contrast between the maximum and the minimum intensifies toward the south, where the benthic front has clearly separated these two water masses. Ra is thus a useful tracer for the studies of oceanic mixing and circulation in the Pacific.

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