Author:
Jones Glenn A.,Ruddiman William F.
Abstract
AbstractL. V. Worthington (1968, Meteorological Monographs 8, 63–67) hypothesized that a low-salinity lid covered the entire world ocean. By deconvolving isotopic curves from the western equatorial Pacific and equatorial Atlantic, W. H. Berger, R. F. Johnson, and J. S. Killingley (1977), Nature (London) 269, 661–663) and W. H. Berger (1978, Deep-Sea Research 25, 473–480) reconstructed “meltwater spikes” similar to those actually observed in the Gulf of Mexico and thus apparently confirmed the Worthington hypothesis. It is shown that this conclusion is unwarranted. The primary flaw in the reconstructed meltwater spikes is that the mixing intensity used in the deconvolution operation is overestimated. As a result, structure recorded in the mixed isotopic record becomes exaggerated in the attempt to restore the original unmixed record. This structure can be attributed to variable ice-volume decay during deglaciation, effects of differential solution on planktonic foraminifera, temporal changes in abundance of the foraminifera carrying the isotopic signal, and analytical error. An alternative geographic view to the global low-salinity lid is offered: a map showing portions of the ocean potentially affected by increased deglacial meltwater at middle and high latitudes and by increased precipitation-induced runoff at low and middle latitudes.
Publisher
Cambridge University Press (CUP)
Subject
General Earth and Planetary Sciences,Earth-Surface Processes,Arts and Humanities (miscellaneous)
Reference98 articles.
1. Benthic mixing in deep-sea cores as determined by 14C dating and its implications regarding climate stratigraphy and the fate of fossil fuel CO2;Peng,1977
2. Digital convolution—Simulating bioturbation mixing with depth domain ash filters;Molfino;EOS, Transactions, American Geophysical Union,1979
3. One-centimeter Stratigraphy in Foraminiferal Ooze: Theory and Practice;Johnson;Ph.D. thesis,1980
4. The oxygen isotope stratigraphic record of the Late Pleistocene
5. Pollen analytical evidence for early forest clearance in North Sumatra
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