In:
Paleoceanography, American Geophysical Union (AGU), Vol. 3, No. 3 ( 1988-06), p. 361-399
Abstract:
Based on detailed reconstructions of global distribution patterns, both paleoproductivity and the benthic δ 13 C record of CO 2 , which is dissolved in the deep ocean, strongly differed between the Last Glacial Maximum and the Holocene. With the onset of Termination I about 15,000 years ago, the new (export) production of low‐ and mid‐latitude upwelling cells started to decline by more than 2‐4 Gt carbon/year. This reduction is regarded as a main factor leading to both the simultaneous rise in atmospheric CO 2 as recorded in ice cores and, with a slight delay of more than 1000 years, to a large‐scale gradual CO 2 depletion of the deep ocean by about 650 Gt C. This estimate is based on an average increase in benthic δ 13 C by 0.4–0.5‰. The decrease in new production also matches a clear 13 C depletion of organic matter, possibly recording an end of extreme nutrient utilization in upwelling cells. As shown by Sarnthein et al., [1987], the productivity reversal appears to be triggered by a rapid reduction in the strength of meridional trades, which in turn was linked via a shrinking extent of sea ice to a massive increase in high‐latitude insolation, i.e., to orbital forcing as primary cause.
Type of Medium:
Online Resource
ISSN:
0883-8305
,
1944-9186
DOI:
10.1029/PA003i003p00361
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1988
detail.hit.zdb_id:
637876-6
detail.hit.zdb_id:
2015231-0
detail.hit.zdb_id:
2916554-4
SSG:
16,13
SSG:
13
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