The spatial-temporal patterns of East Asian climate in response to insolation, CO2 and ice sheets during MIS-5

Orbital Controls on North Pacific Dust Flux During the Late Quaternary

“…A precessional control over dust fluxes arising from precipitation in the source regions is further demonstrated by climate model simulations exploring the regional sensitivity of summer precipitation in the Asian-African region to precession (Text S5 in Supporting Information S1, Figure 4a). Those results are consistent with a dominant control of precession forcing on summer precipitation in North China (Lyu & Yin, 2022;Lyu et al, 2021) and North Africa (Larrasoaña et al, 2015;Skonieczny et al, 2019) (Figure S5d in Supporting Information S1). Wetter conditions in dust source regions could reduce the production and supply of dust, thereby contributing to decreased dust fluxes during intervals of strong precession-driven insolation (Figure 4a).…”

Co-evolution of orbital-to-millennial East Asian monsoon and westerlies variability over the past 150 ka

“…7d), which is in good agreement with anti-phase seasonal insolation. The orbital-timescale dynamics of the EASM are mainly attributed to precession-dominated northern hemispheric summer insolation (Wang et al, 2008;Cheng et al, 2016), aligning with the findings of HadCM3 (Hadley Centre Coupled Model, version 3) (Lyu and Yin, 2022) and LOVECLIM1.3 soil-climate process models (Ranathunga et al, 2023). Compared to PI, higher summer insolation during the EH can induce stronger land-ocean thermal gradients, which facilitates stronger summer monsoon circulation and brings more water vapor to the CLP (Ruddiman, 2006;Kutzbach et al, 2008).…”

“…Although some areas of arid inland Asia may become wetter, the annual precipitation anomaly at ZS is still negative, in agreement with our proxy. Anomalous northerlies develop in summer, indicating a prominent weaker EASM, supporting that the ice sheets played a major role in influencing the variability of the EASM (Cheng et al, 2016;Lyu et al, 2021;Lyu and Yin, 2022). In contrast to boreal summer, the EAWM is enhanced, as shown by the northerly wind anomalies over East Asia.…”

“…However, it is worth noting that the presence of the Eurasian ice sheet was also found to reinforce the EASM. Because the influence of ice sheets on the EASM precipitation is non-linear and depends on the background insolation and the size, shape, location of ice sheets (Yin et al, 2008(Yin et al, , 2009Muri et al, 2013;Lyu and Yin, 2022). Moreover, the cooling also generates a high-tropospheric wave train across Eurasia, causing the southward displacement of the westerlies over East Asia, as well as the EASM (Shi et al, 2019).…”

Robust land surface temperature record for north China over the past 21,000 years

“…Besides changes in growing season length, a change in wind patterns may also influence LGM temperatures. A climate modeling experiment has indicated that the presence of ice sheets can introduce nonlinear wave patterns in the prevailing winds ( 69 ). While the ice sheets lead to cooling in the mid-high latitudes, the modified wind pattern can reduce this effect at certain locations by blocking winds from the north.…”