Abstract

A number of climate archives have documented millennial-scale variability during the Holocene. It is not currently known whether these variations are forced or unforced. A solar forcing hypothesis has been put forward to explain the 1000 and 2500-year periodicities because of similarities between the spectral peaks in the proxy records and reconstructions of solar variability. Our work on a marine record of Mg/Ca-based sea surface temperatures (SSTs) within the Indo-Pacific Warm Pool (core MD98-2181) challenges the solar hypothesis because there is no coherence between the amplitude of changes in solar forcing and in the proxy SSTs. There is also a long phase delay between the peak in forcing and the maximum response. On the other hand, there exists the possibility that the deep ocean can drive some of the Holocene variability, especially at the 1500-year timescale. This periodicity is reminiscent of the …

Date

2014

Authors

D Khider, LD Stott, C Jackson, G Huerta

Journal

AGU Fall Meeting Abstracts

Volume

2014

Pages

PP41C-1379