Insolation driven biomagnetic response to Holocene Warm Period in semi-arid East Asia

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Liu, S. ; Deng, Chenglong ; Xiao, Jule ; Li, Jinhua ; Paterson, Greig ; Chang, Liao ; Yi, Liang ; Qin, Huafeng ; Pan, Yongxin ; Zhu, Rixiang (2015)

The Holocene Warm Period (HWP) provides valuable insights into the climate system and biotic responses to environmental variability and thus serves as an excellent analogue for future global climate changes. Here we document, for the first time, that warm and wet HWP conditions were highly favourable for magnetofossil proliferation in the semi-arid Asian interior. The pronounced increase of magnetofossil concentrations at ~9.8 ka and decrease at ~5.9 ka in Dali Lake coincided respectively with the onset and termination of the HWP, and are respectively linked to increased nutrient supply due to postglacial warming and poor nutrition due to drying at ~6 ka in the Asian interior. The two-stage transition at ~7.7 ka correlates well with increased organic carbon in middle HWP and suggests that improved climate conditions, leading to high quality nutrient influx, fostered magnetofossil proliferation. Our findings represent an excellent lake record in which magnetofossil abundance is, through nutrient availability, controlled by insolation driven climate changes.
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    We thank Jiawei Fan, Ruilin Wen and Dayou Zhai for help during fieldwork and Yinzhao Wang for assistance with magnetic extraction. TEM analyses were performed at the Institut de Mine´ralogie, de Physique des Mate´riaux, et de Cosmochimie (IMPMC), (CNRS UMR 7590, Sorbonne Universite´s, MNHN, UPMC, IRD UMR 206, 75005 Paris, France). This research was supported by the NSFC grant 41330104 and the 973 program grant 2012CB821900. J.X. was supported by the 973 program grant 2010CB833400 and the NSFC grant 41130101. J.L. received support from the NSFC grant 41374004. C.D. acknowledges further support from the NSFC grant 40925012 and the CAS Bairen Program.

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