High-latitude biomes and rock weathering mediate climate-carbon cycle feedbacks on eccentricity timescales.

ABSTRACT: The International Ocean Discovery Programme (IODP) and its predecessors generated a treasure trove of Cenozoic climate and carbon cycle dynamics. Yet, it remains unclear how climate and carbon cycle interacted under changing geologic boundary conditions. Here, we present the carbon isotope (δ¹³C) megasplice, documenting deep-ocean δ¹³C evolution since 35 million years ago (Ma). We juxtapose the δ¹³C megasplice with its δ¹⁸O counterpart and determine their phase-difference on ~100-kyr eccentricity timescales. This analysis reveals that 2.4-Myr eccentricity cycles modulate the δ¹³C-δ¹⁸O phase relationship throughout the Oligo-Miocene (34-6 Ma), potentially through changes in continental weathering. At 6 Ma, a striking switch f

SUBMITTER: De Vleeschouwer D 

PROVIDER: S-EPMC7538577 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature