High-sedimentation-rate loess records: A new window into understanding orbital- and millennial-scale monsoon variability

Sun, Youbin; Clemens, Steven C.; Guo, Fei; Liu, Xingxing; Wang, Yang; Yan, Yan; Liang, Lifeng

doi:10.1016/j.earscirev.2021.103731

Cited by 38 publications

(51 citation statements)

References 142 publications

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“…The upper 18 m is mapped to the OSL-dated Yuanbao loess outcrop (~4 kilometers away) (Lai et al, 2006). The chronostratigraphy has been generated using an independent loess chronology generated by synchronizing Chinese loess and speleothem δ 18 O records back to 650 ka (Sun et al, 2021a). The first set of control points tie the loess/paleosol boundaries S6 to S0 to the timing of the glacial terminations/inceptions in speleothem δ 18 O (Cheng et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

“…High-resolution loess records have revealed persistent millennial-scale (1-10 kyr periodicity) EAM fluctuations spanning the last several glacial cycles (Guo et al, 1996;Sun et al, 2012Sun et al, , 2021aGuo et al, 2021), which are dynamically linked with high-latitude abrupt changes in the https://doi.org/10.5194/cp-2021-188 Preprint. Discussion started: 17 January 2022 c Author(s) 2022.…”

Section: Introductionmentioning

confidence: 99%

“…As such, two important outstanding questions remain; is there a reliable proxy for East Asian summer monsoon (EASM) rainfall at the millennial timescale and what factors modulate the MMV thereof? Due to weak pedogenesis and high sedimentation rates, millennial-scale oscillations are well preserved in the western and northwestern Chinese Loess Plateau (CLP) over the past glacial cycles (Sun et al, 2012(Sun et al, , 2021aGuo et al, 2021). The Linxia profile is well-suited for reconstructing rapid monsoon changes because it is located in monsoon frontal zone and sensitive to high-and low-latitude climate variability.…”

Section: Introductionmentioning

confidence: 99%

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Greenhouse gases modulate the strength of millennial-scale subtropical rainfall, consistent with future predictions

Guo

Clemens

Liu

et al. 2022

Preprint

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Abstract. Millennial-scale East Asian monsoon variability is closely associated with natural hazards through long-term variability in flood and drought cycles. Therefore, exploring what drives the millennial-scale variability is of significant importance for future prediction of extreme climates. Here we present a new East Asian summer monsoon (EASM) rainfall reconstruction from the northwest Chinese loess plateau spanning the past 650 kyr. The magnitude of millennial-scale variability (MMV) in EASM rainfall is linked to ice volume and greenhouse gas (GHG) at the 100-kyr earth-orbital eccentricity band and to GHG and summer insolation at the precession band. At the glacial-interglacial cycle, gradual changes in CO2 at times of intermediate ice volume leads to increased variability in North Atlantic stratification and Atlantic meridional overturning circulation, propagating abrupt climate changes into East Asia via the westerlies. Within the 100-kyr cycle precession variability further enhances the response, showing that stronger insolation and increased atmospheric GHG cause increases in the MMV of EASM rainfall. These findings indicate increased extreme precipitation events under future warming scenarios, consistent with model results.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Greenhouse gases modulate the strength of millennial-scale subtropical rainfall, consistent with future predictions

Guo

Clemens

Liu

et al. 2022

Preprint

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“…Variations of Mz in loess reflect wind energy and this relationship has been applied in many paleoclimate reconstructions (Li et al, 2015;Sun et al, 2012Sun et al, , 2015. In general, Mz exhibits glacial-interglacial, stadial-interstadials and millennial-scale fluctuations, with relatively coarser values in glacial and stadial periods, during which the dust accumulation rate and dust flux are greater (Sun et al, 2021). Variations of Mz can be affected by wind strength, source-to-sink distance and expanding desert margin (Ding et al, 1999;Yang & Ding, 2008).…”

Section: Mean Grain Size (Mz)mentioning

confidence: 99%

“…It has been noted that loess in the CLP is comprises mainly dust from the Gobi and deserts of northern China (Sun, 2020;Sun et al, 2001). Under the condition of constant dust source, the influence of source-to-sink distance is mainly reflected in the spatial variation of loess Mz, as the greater the distance from source, the finer the loess Mz (Sun et al, 2021). The influence of desert expansion on the loess Mz values between 65 and 25 ka is likely to be only minor, since, between the Last Glacial Maximum and Holocene Optimum, deserts in northern China extended only 20 km southwards (Lu et al, 2013).…”

Section: Mean Grain Size (Mz)mentioning

confidence: 99%

Seasonality of Response to Millennial‐Scale Climate Events of the Last Glacial: Evidence From Loess Records Over Mid‐Latitude Asia

Fan

Jia

Xia

et al. 2021

Geochem Geophys Geosyst

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In the context of anthropogenic climate change, the need for an accurate, detailed understanding of the earth system has become increasingly important. Geological records provide climatic boundary conditions that are pivotal in numeric reconstructions of past climates. More importantly, proxy climatic records reveal the sensitivity of climate processes at decadal to millennial timescales and unforeseen non-linear responses. Paleoclimatic reconstructions are generally based on so-called proxies and numerical simulations, or their combinations thereof (e.g., Chen et al., 2016;Kang et al., 2020;Li et al., 2020). Paleoclimatic proxies yield indirect signals of climatic characteristics, according to the means by which the proxies themselves respond to changes in the environment. Climatic simulations deliver approximate representations of paleoclimate change which can be deployed to predict future climate under different boundary conditions. Nevertheless, paleoclimate reconstructions based on geological records may sometimes differ from-or even contrast sharply with simulations (e.g.,

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Controlling factors and palaeoclimatic significance of colour reflectance in the Late Tertiary red clay on the Chinese Loess Plateau

et al. 2022

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The colour of soil is one of its most striking features, and records the palaeoenvironment conditions when the soil is formed; however, the controlling factors and palaeoclimatic significance of colour reflectance in the Late Tertiary red clay are poorly understood. In this study, the Jiaxian section, on the northern edge of the Chinese Loess Plateau, was selected to explore the aforementioned issue using colour reflectance, diffuse reflectance spectroscopy (DRS), geochemical, and magnetic approaches. In the red clay sequence, (1) the concentration of iron oxides (mainly haematite and goethite) and the intensity of pedogenesis were significantly positively correlated with redness (a*) and yellowness (b*). (2) a*, b*, and a*/b* can be used as proxy indicators of haematite concentration, goethite concentration, and temperature, respectively. (3) The parameters derived from colour reflectance and DRS measurements were proven to be better than magnetic susceptibility (χ) in recording palaeoclimatic evolution, and Ca*b* was better than the chemical weathering index in recording soil development.

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High-sedimentation-rate loess records: A new window into understanding orbital- and millennial-scale monsoon variability

Cited by 38 publications

References 142 publications

Greenhouse gases modulate the strength of millennial-scale subtropical rainfall, consistent with future predictions

Greenhouse gases modulate the strength of millennial-scale subtropical rainfall, consistent with future predictions

Seasonality of Response to Millennial‐Scale Climate Events of the Last Glacial: Evidence From Loess Records Over Mid‐Latitude Asia

Controlling factors and palaeoclimatic significance of colour reflectance in the Late Tertiary red clay on the Chinese Loess Plateau

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