Mega‐pulses and megacycles in East Asian monsoon variations recorded in Chinese loess‐red clay magnetic susceptibility

Xiong, Shangfa; Jiang, Wenying; Liu, Tungsheng

doi:10.1029/2006gl027842

Cited by 8 publications

(2 citation statements)

References 28 publications

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“…Both the CLP goethite concentration and the benthic δ 18 O records exhibit a ∼0.8 Myr‐long cyclicity during 6–3.7 Ma, with higher goethite concentration corresponding to colder climate/larger ice volume (Shackleton et al, ) (Figures b and c). Past studies reveal 400 kyr cycles in the CLP and benthic δ 18 O records (Evans et al, ; Nie, ; Tiedemann et al, ; Wang et al, ; Xiong et al, ) related to eccentricity forcing (Clemens & Tiedemann, ; Nie et al, ). Strangely, the ∼0.8 Myr‐long cyclicity does not belong to any orbital parameters.…”

Section: Discussionmentioning

confidence: 99%

Goethite Concentration Variations in the Red Clay Sequence on the Chinese Loess Plateau

Zhang

Nie

2017

Geochem Geophys Geosyst

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The Goethite is a common magnetic mineral in soils and is important for understanding past climatic and environmental change. Although goethite concentration records are available for the Quaternary loess‐paleosol sequences from the Chinese Loess Plateau (CLP), no goethite concentration record is available for the underlying Red Clay sequence. Here, we generate a record of goethite concentration from the Chaona section on the CLP and investigate the relationship between goethite and ferrimagnetic mineral concentration and climate parameters on the Red Clay sequence deposited from 6 to 2.7 Ma. We found that increasing goethite concentration generally corresponds to decreasing magnetic susceptibility for the Red Clay sequence, with the exception of an anomalous section from 4.3 to 3.7 Ma where both records show increasing trends. Precipitation seasonality could explain this opposite variation pattern between magnetic susceptibility and goethite concentration in the Red Clay sequence. From 3.6 to 2.7 Ma, goethite concentration has a decreasing trend while magnetic susceptibility increased, which we interpret as more seasonally distributed precipitation associated with intensification of the East Asian summer monsoon (EASM). Similar pattern was observed from 0.65 to 0 Ma from the Lingtai section. Taken together, the goethite record reveals that the EASM experienced two stages of rapid intensification with apparent seasonally distributed precipitation since 6 Ma.

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Section: Discussionmentioning

confidence: 99%

Goethite Concentration Variations in the Red Clay Sequence on the Chinese Loess Plateau

Zhang

Nie

2017

Geochem Geophys Geosyst

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“…The same is observed in the deep-sea carbonate % records ( Figure 8B) of all the oceans, implying that the long-term changes in the oceanic carbon reservoir do not follow the 400-ka eccentricity cycles in the Pleistocene [79] ; rather, a quasi-cyclicity of 0.5 Ma appears in the last million years. As the long-eccentricity signal becomes obscured also in other records of the Pleistocene monsoon, such as in dust records of the Indian and African monsoons in the Indian ( Figure 7C) and Atlantic Oceans ( Figure 7D) or in magnetic susceptibility record of the East Asian monsoon in the Chinese Loess Plateau [101] , the turn at 1.6 Ma indicates a mode shift in the long-term changes of the monsoon climate.…”

Section: Figurementioning

confidence: 96%