The response of global terrestrial vegetation to orbital forcing and CO2 during MIS 11 and MIS 13

Su, Qianqian;Yin, Qiuzhen;Lyu, Anqi;Wu, Zhipeng
(2021) 7th international Geologica Belgica Meeting — Location: Brussels, Belgium (15.September.2021)

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Despite significant progress in paleoclimate reconstructions and modelling of different aspects of the past interglacial cycles, the mechanisms which transform the impact of solar insolation variations into long-term and global-scale terrestrial vegetation changes are still not fully understood. Here using the Earth system model of intermediate complexity LOVECLIM, we performed simulations of the coevolution of climate and vegetation during MIS 11 and MIS 13 setting the orbital forcing alone or both orbital forcing and GHGs as external forcings. Through simple and multilinear regression analysis, the results indicate that in most regions worldwide, the climate and vegetation show both obliquity and precession signals during MIS-11 and MIS-13. The amplitude variation of precession is low during MIS-11 but relatively much higher during MIS-13. This leads to a much stronger precession signal in GDD0, precipitation, the tree and grass fraction, and a weaker obliquity signal during MIS-13 than MIS-11. Compared with insolation, CO2 plays a minor role, but it plays a slightly more important role due to the larger amplitude of variation during MIS-13. MIS-11 was a relatively stable interglacial with a long-lasting optimum phase (i.e., generally warmer than PI) during early MIS-11 (lasts till ~ 405 ka BP). Although the available climate/vegetation proxy-based reconstructions show different magnitudes and fluctuation amplitudes in different sites, the peak and abrupt decline events tend to agree with simulation results.
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Su, Q., Yin, Q., Lyu, A., & Wu, Z. (2021). The response of global terrestrial vegetation to orbital forcing and CO2 during MIS 11 and MIS 13. 7th international Geologica Belgica Meeting, Brussels, Belgium. https://hdl.handle.net/2078.5/241188