Distribution of 10Be and 9Be in the Pacific Ocean

Details Distribution of 10Be and 9Be in the Pacific Ocean Distribution of 10Be and 9Be in the Pacific Ocean

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..82..231k&link_type=abstract

Earth and Planetary Science Letters, Volume 82, Issue 3-4, p. 231-240.

Computer Science

27

Scientific paper

The vertical distributions of 10Be and 9Be at three locations in the Pacific (25°N, 170°E 17°N, 118°W 3°S, 117°W) are presented. The results show that both isotopes exhibit nutrient-like profiles. From the surface to the bottom, the increase for 10Be is two- to threefold and that for 9Be is about fivefold. While the inter-station variations in surface water concentrations may reach a factor of two, deep-water values tend to be much more uniform averaging about 2000 atoms/g for 10Be and 30 pM for 9Be. A similar situation applies to the 10Be/9Be ratio; it varies approximately from 1 to 3 × 10-7 (atom/atom) at shallow depths but tends toward a value close to 1.1 × 10-7 in the deep ocean. The variation of 10Be/9Be can be viewed as resulting from the fact that 10Be in a given parcel of water consists of two components: recycled and primary. The recycled component is that part of 10Be which has reached tracer equilibrium with 9Be, as opposed to the primary component which, upon entering the sea from the atmosphere, has yet to equilibrate with 9Be through particle cycling and mixing processes. It is estimated that 70% to nearly 100% of 10Be at the three stations are being recycled, and the recycled beryllium bears an atomic ratio of 10Be/9Be close to 1 × 10-7. The oceanic residence time of Be is of the order of 1000-4000 years, comparable to or slightly longer than the ocean mixing time.

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