Milankovitch theory and monsoon

Interdecadal to Centennial Climate Variability Surrounding the 8.2 ka Event in North China Revealed Through an Annually Resolved Speleothem Record From Beijing

“…More evidences for the interregional similarities in the early and middle 8.2 ka event and the dissimilarities in the termination processes are observed in a number of paleoclimate records from various climate systems (Figure S1 in Supporting Information ) (P. Duan, Li, et al., 2021), likely suggesting different dynamic mechanism(s) in two intervals (P. Duan, Li, et al., 2021). It seems that the distinct termination processes (Figure 4) imply a low‐middle latitude to high latitude directionality for the climate signal propagation, which is akin to the termination of millennial‐scale abrupt events, such as the Younger Dryas (Cheng et al., 2020) and Heinrich Stadials (Cheng, Xu, et al., 2021; X. Dong et al., 2022), possibly indicating that the initial trigger (precursor events) of the termination resided out of the North Atlantic (Cheng et al., 2020, 2022; Cheng, Xu, et al., 2021; H. Zhang, Cheng, et al., 2021).…”

“…The broad consistency of the δ 18 O p variation over the ASM domain (Figure S4 in Supporting Information ) suggests an important impact of the large‐scale ASM circulation on δ 18 O p over East China. Additionally, the negative correlation between the δ 18 O p and rainfall amount over North China (Figure S4 in Supporting Information ) manifests an apparent rainfall “amount effect” (Cheng et al., 2022; Duan, Ruan, et al., 2016). Since speleothem BH‐2 was deposited in approximately equilibrium conditions, its δ 18 O signal generally inherits from the δ 18 O p in the summer monsoon season.…”

“…It seems that the distinct termination processes (Figure 4) imply a low-middle latitude to high latitude directionality for the climate signal propagation, which is akin to the termination of millennial-scale abrupt events, such as the Younger Dryas (Cheng et al, 2020) and Heinrich Stadials (Cheng, Xu, et al, 2021;X. Dong et al, 2022), possibly indicating that the initial trigger (precursor events) of the termination resided out of the North Atlantic (Cheng et al, 2020(Cheng et al, , 2022Cheng, Xu, et al, 2021;.…”

“…The 8.2 ka event, as the most prominent abrupt cold event within the Holocene registered initially in the Greenland ice core records (Thomas et al., 2007), has been widely revealed by a large number of marine and terrestrial archives and dated to ∼8.3–8.0 ka BP (thousand years before present, present =1950 CE) with a duration of 150–200 years (Figure S1 in Supporting Information ) (e.g., Alley et al., 1997; Cheng, Fleitmann, et al., 2009; P. Duan, Li, et al., 2021; Y. Liu et al., 2013; Morrill et al., 2013; Thomas et al., 2007). This event has been generally attributed to an interruption (or slowdown) of the Atlantic Meridional Overturning Circulation (AMOC) resulting from a large freshwater influx into the North Atlantic, causing a series of chain responses of climate globally (e.g., Alley et al., 1997; Barber et al., 1999; Cheng et al., 2022; Ellison et al., 2006; Matero et al., 2017).…”

Loess deposit reveals variations of 100-kyr cycle of temperature and 20-kyr cycle of precipitation at the low latitude of East Asia

“…In this scenario, loess and stalagmite should show the same precession cycle, however, they record different dominant cycles of EASM, which becomes the so-called "Chinese 100-kyr Problem" (Cheng et al, 2019). It is suggested to blend the global monsoon with the existing framework of the orbital theory (Cheng et al, 2022).…”