Was deep water formed in the North Pacific during the Late Quaternary? Cadmium evidence from the Northwest Pacific

Details Was deep water formed in the North Pacific during the Late Quaternary? Cadmium evidence from the Northwest Pacific Was deep water formed in the North Pacific during the Late Quaternary? Cadmium evidence from the Northwest Pacific

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.124..185o&link_type=abstract

Earth and Planetary Science Letters, Volume 124, Issue 1-4, p. 185-194.

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11

Scientific paper

A benthic foraminifera Cd/Ca record, dating from the last glacial period to the Holocene, for a high sedimentation rate core recovered from the northwest Pacific is reported. It shows that the deep water (water depth of 2700 m) cadmium concentration was about 50% lower in the last glacial period than in the Holocene. At 15 kyr B.P., the beginning of deglaciation, a minimum Cd/Ca is recorded which is almost the same as that of the modern North Atlantic. Considering previously obtained cadmium records from the northwesternmost and western equatorial Pacific, a steep gradient in the deep-water cadmium concentration between the western equatorial Pacific and the northwest Pacific from the last glacial to deglacial periods has been estimated. In contrast to cadmium records, benthic foraminifera δ13C records in these regions showed similar increasing trends during this time span and no large difference in δ13C can be observed between these two regions. This discordance between these two nutrient tracers may come from the change in the δ13C-phosphate relationship in the ocean during the Late Quaternary. Although we cannot absolutely rule out other possibilities, we suggest that there was a convection cell in the northwest Pacific during the last glacial period and at the beginning of deglaciation period the turnover rate of this cell increased and cadmium concentration in the northwest Pacific significantly decreased.

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