Climate evolution across the Mid-Brunhes Transition

Aaron M. Barth, Peter U. Clark, Nicholas S. Bill, Feng He, Nicklas G. Pisias

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Abstract

The Mid-Brunhes Transition (MBT) began ∼430 ka with an increase in the amplitude of the 100 kyr climate cycles of the past 800 000 years. The MBT has been identified in ice-core records, which indicate interglaciations became warmer with higher atmospheric CO 2 levels after the MBT, and benthic oxygen isotope (δ 18 O) records, which suggest that post-MBT interglaciations had higher sea levels and warmer temperatures than pre-MBT interglaciations. It remains unclear, however, whether the MBT was a globally synchronous phenomenon that included other components of the climate system. Here, we further characterize changes in the climate system across the MBT through statistical analyses of ice-core and δ 18 O records as well as sea-surface temperature, benthic carbon isotope, and dust accumulation records. Our results demonstrate that the MBT was a global event with a significant increase in climate variance in most components of the climate system assessed here. However, our results indicate that the onset of high-amplitude variability in temperature, atmospheric CO 2 , and sea level at ∼ 430 ka was preceded by changes in the carbon cycle, ice sheets, and monsoon strength during Marine Isotope Stage (MIS) 14 and MIS 13.

Original languageEnglish
Pages (from-to)2071-2087
Number of pages17
JournalClimate of the Past
Volume14
Issue number12
DOIs
Publication statusPublished - 21 Dec 2018

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Barth, A. M., Clark, P. U., Bill, N. S., He, F., & Pisias, N. G. (2018). Climate evolution across the Mid-Brunhes Transition. Climate of the Past, 14(12), 2071-2087. https://doi.org/10.5194/cp-14-2071-2018