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Barth, Aaron M; Clark, Peter U; Bill, Nicholas S; He, Feng; Pisias, Nicklas G (2018): Climate proxies of sea-surface temperature, carbon isotopes, and dust flux for the last 800-kyr and the Mid-Brunhes Transition. PANGAEA, https://doi.org/10.1594/PANGAEA.894898, Supplement to: Barth, AM et al. (in review): Climate evolution across the Mid-Brunhes Transition. Climate of the Past Discussions, 1-31, https://doi.org/10.5194/CP-2018-20

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Abstract:
The Mid-Brunhes Transition (MBT) began ∼430ka 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 CO2 levels after the MBT, and benthic oxygen isotope (δ18O) records, which suggest that post-MBT interglaciations had higher sea levels 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 δ18O 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 CO2, and sea level at ∼430ka was preceded by changes in the carbon cycle, ice sheets, and monsoon strength during MIS 14 and 13.
Related to:
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