当前位置：
X-MOL 学术
›
J. Asian Earth Sci.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Loess magnetic susceptibility flux: A new proxy of East Asian monsoon precipitation
Journal of Asian Earth Sciences ( IF 3 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jseaes.2020.104489 Xianghui Kong , Weijian Zhou , J. Warren Beck , Feng Xian , Xiaoke Qiang , Hong Ao , Zhenkun Wu , Zhisheng An
Journal of Asian Earth Sciences ( IF 3 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jseaes.2020.104489 Xianghui Kong , Weijian Zhou , J. Warren Beck , Feng Xian , Xiaoke Qiang , Hong Ao , Zhenkun Wu , Zhisheng An
Abstract Magnetic susceptibility (χ) of loess-paleosol sequences on the Chinese Loess Plateau (CLP) has been widely used as a proxy for East Asian summer monsoon (EASM) precipitation variability. Such records typically show strong climate forcing in the ~100 ka orbital eccentricity band, but exhibit weak precessional (~23 ka) forcing relative to that seen in oxygen isotopes from marine sediments. This is puzzling as monsoons should be highly sensitive to precession variations. We assert that this lack of precessional signal is because χ is a concentration, which is strongly affected by the dilution effect of dust sedimentation rate superimposed on rainfall rate. χ-flux on the other hand corrects for dust accumulation rate and bulk density effects to better reveal pedogenic mineral ingrowth rates associated with rainfall. In this study, we compare three 600 ka records of loess pedogenic χ-flux from the CLP with Chinese speleothem δ18O records and a 550 ka loess-paleosol 10Be flux record from Baoji which has also been used as a monsoon precipitation proxy record. Pedogenic χ-flux exhibits clear signals of orbital precession, whereas χ (-concentration) does not.
更新日期：2020-10-01
京公网安备 11010802027423号