Long-term winter/summer warming trends during the Holocene revealed by α-cellulose δ18O/δ13C records from an alpine peat core from central Asia

Rao, Zhiguo; Li, Yunxia; Huang, Chao; Zhang, Xinzhu; Yang, Wen; Liu, Lidan; Wu, Yi

doi:10.1016/j.quascirev.2020.106217

Cited by 51 publications

(38 citation statements)

References 42 publications

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“…5), reflecting a dense vegetation cover, also represent warm conditions during this period. The pollen data are comparable to that found from previous palynological studies carried out in northern China (e.g., Yi et al, 2003;Ren, 2007;Chen and Wang, 2012;Li et al, 2019) and northeastern China (e.g., Ren and Beug, 2002;Li et al, 2011;Stebich et al, 2015), from which a warm, wet climate corresponding to the Holocene Optimum was inferred. Under the influence of the Holocene Optimum, the forest cover evidently increased in northern and northeastern China (Ren, 2007).…”

Section: Paleovegetation Reconstruction and Its Climate Significancesupporting

confidence: 87%

“…The pollen data are comparable to that found from previous palynological studies carried out in northern China (e.g., Yi et al, 2003;Ren, 2007;Chen and Wang, 2012;Li et al, 2019) and northeastern China (e.g., Ren and Beug, 2002;Li et al, 2011;Stebich et al, 2015), from which a warm, wet climate corresponding to the Holocene Optimum was inferred. Under the influence of the Holocene Optimum, the forest cover evidently increased in northern and northeastern China (Ren, 2007). In the YR drainage area and Shandong Peninsula, the broadleaved deciduous forest thrived, accompanied by the presence of monsoonal evergreen forest and the abrupt decrease in the herbaceous taxa and conifers (Yi et al, 2003;Chen and Wang, 2012;Li et al, 2019).…”

Section: Paleovegetation Reconstruction and Its Climate Significancesupporting

confidence: 87%

“…Similarly, summer warming in Central Asia during the Middle to Late Holocene, recorded by the alpine peat α-cellulose δ 13 C record from the Altai Mountains (Rao et al, 2019), has been proposed to be mainly driven by the enhanced GHG forcing and increasing human activities. Rao et al (2020) suggested that GHG forcing was the dominant driver of the summer and winter warming trends since ∼ 5000 BP. The effects of GHG forcing are global.…”

Section: Holocene Temperature Variations In North China and Possible mentioning

confidence: 99%

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Holocene vegetation dynamics in response to climate change and hydrological processes in the Bohai region

et al. 2020

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Abstract. Coastal vegetation both mitigates the damage inflicted by marine disasters on coastal areas and plays an important role in the global carbon cycle (i.e., blue carbon). Nevertheless, detailed records of changes in coastal vegetation composition and diversity in the Holocene, coupled with climate change and river evolution, remain unclear. To explore vegetation dynamics and their influencing factors on the coastal area of the Bohai Sea (BS) during the Holocene, we present high-resolution pollen and sediment grain size data obtained from a sediment core of the BS. The results reveal that two rapid and abrupt changes in salt marsh vegetation are linked with the river system changes. Within each event, a recurring pattern – starting with a decline in Cyperaceae, followed by an increase in Artemisia and Chenopodiaceae – suggests a successional process that is determined by the close relationship between Yellow River (YR) channel shifts and the wetland community dynamics. The phreatophyte Cyperaceae at the base of each sequence indicate lower saline conditions. Unchannelized river flow characterized the onset of the YR channel shift, caused a huge river-derived sediment accumulation in the floodplain and destroyed the sedges in the coastal depression. Along with the formation of a new channel, lateral migration of the lower channel stopped, and a new intertidal mudflat was formed. Pioneer species (Chenopodiaceae, Artemisia) were the first to colonize the bare zones of the lower and middle marsh areas. In addition, the pollen results revealed that the vegetation of the BS land area was dominated by broadleaved forests during the Early Holocene (8500–6500 BP) and by conifer and broadleaved forests in the Middle Holocene (6500–3500 BP), which was followed by an expansion of broadleaved trees (after 3500 BP). The pollen record indicated that a warmer Early and Late Holocene and colder Middle Holocene were consistent with previously reported temperature records for East Asia. The main driving factors of temperature variation in this region are insolation, the El Niño–Southern Oscillation and greenhouse gases forcing.

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Section: Paleovegetation Reconstruction and Its Climate Significancesupporting

confidence: 87%

Section: Paleovegetation Reconstruction and Its Climate Significancesupporting

confidence: 87%

Section: Holocene Temperature Variations In North China and Possible mentioning

confidence: 99%

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Holocene vegetation dynamics in response to climate change and hydrological processes in the Bohai region

et al. 2020

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“…3c) was initially proposed as an indicator of moisture changes; however, this interpretation lacks validation by modern process investigations (Xu et al, 2019). Based on on-site monitoring studies in the nearby SSP, the BBP peat α-cellulose δ 18 O record has been reinterpreted as a record of winter temperature changes (Rao et al, 2020), which show a long-term winter warming trend during the Holocene (Fig. 3c).…”

Section: Comparison Of Holocene Temperature Records From the Altai Momentioning

confidence: 99%

“…1) in the southern Altai Mountains (Zhang et al, 2018a); ice core δ 18 O data from the Western Belukha Plateau (WBP; Fig. 1) in the Siberian Altai Mountains (Henderson et al, 2006;Aizen et al, 2016); and α-cellulose δ 13 C/δ 18 O (Rao et al, 2019b(Rao et al, , 2020 and microbial membrane lipids (Wu et al, 2020) from the Sahara sand peatland (SSP; Fig. 1) in the southern Altai Mountains.…”

Section: Introductionmentioning

confidence: 99%

Consistent long‐term Holocene warming trend at different elevations in the Altai Mountains in arid central Asia

Rao

Guo

Cao

et al. 2020

J Quaternary Science

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Recent results indicate contrasting Holocene moisture histories at different elevations in arid central Asia (ACA). However, relatively little is known about Holocene temperature changes at different elevations. Here we report an independently dated peat brGDGTs-based MBT' 5ME record from the Narenxia peatland (NRX) in the southern Altai Mountains. The record suggests a long-term warming trend since~7.7 cal. kyr BP, with a warmer stage during~7-5.5 cal. kyr BP, a cold stage during~5.5-4 cal. kyr BP, and a warming trend over the last~4 kyr. The longterm warming trend indicated by the NRX MBT' 5ME record is largely consistent with Holocene temperature records from nearby sites covering an altitudinal range of~1700-4100 m above sea level. This consistent long-term warming trend at different elevations differs from the long-term Holocene drying/wetting trends at high/low elevations of the Altai Mountains. We propose that the warming trend and consequent permafrost thawing at high elevations could have resulted in increased meltwater runoff, which would have contributed to the long-term wetting trend at low elevations. Our findings potentially provide an improved understanding of regional climate change and associated water resource availability, with implications for their possible future status.

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Millennial‐ to centennial‐scale anti‐phase relationship between the Westerlies and the East Asian summer monsoon and its cultural response along the Silk Roads after a great earthquake in southern Altay ~ 3500 cal a BP

Fan

Jiang

et al. 2022

J Quaternary Science

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It is strongly debated whether the Westerlies and the East Asian summer monsoon (EASM) are in‐phase, anti‐phase or out‐of‐phase, and how hydroclimatic changes in the above two climate systems affected trans‐Eurasian cultural exchanges during the late Holocene. In this study, we establish a 3500‐a‐long paleoclimatic sequence based on high‐resolution analyses of sedimentological and geochemical data of a well‐dated sediment core from Yileimu Lake in southern Altay. High percentages of the >63‐µm fraction and high values of Zr/Rb and Rb/Sr ratios indicate strong transport of weakly weathered, coarse sediments into the depocenter of the lake caused by enhanced surface runoff and catchment erosion associated with a wet climate, and vice versa. High values of Ca and total inorganic carbon (TIC) contents imply increased precipitation of endogenic carbonates in the lake water under intense evaporation associated with a dry climate, and vice versa. This new record indicates two wet intervals at 3500–2300 and 600–100 cal a bp, interrupted by a severe and prolonged dry interval from 2300 to 1000 cal a bp, and a mild dry interval with occasionally wet conditions from 1000 to 600 cal a bp. These results are broadly consistent with other paleoclimatic records in Westerlies‐dominated Asia and are generally anti‐phase with those in the EASM region. We suggest that a strengthening/weakening and southward/northward migration of the Westerlies during a negative/positive phase of the North Atlantic Oscillation (NAO) transported more/less water vapor into arid Asia. Meanwhile, a decreasing/increasing El Niño‐Southern Oscillation (ENSO) superimposed on a southward/northward shift of the Intertropical Convergence Zone (ITCZ) triggered a weakening/strengthening and southward/northward movement of the West‐Pacific subtropical high (WPSH), resulting in decreasing/increasing EASM intensity. In addition, the wet climate from 3500 to 2300 cal a bp may have contributed to the development of nomadic herding in the eastern Eurasian Steppe and Altay region, and to the opening of the proto‐Silk Roads. Potentially, intense seismic activities in the Altay Mountains ~3500 cal a bp may have also promoted the opening of the proto‐Silk Roads by forcing the herdsmen to move to the inter‐mountainous basins. The strong EASM intensity from 2300 to 1000 cal a bp in eastern China may have contributed to the creation of the ancient Silk Roads by the Han Dynasty.

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Long-term winter/summer warming trends during the Holocene revealed by α-cellulose δ18O/δ13C records from an alpine peat core from central Asia

Cited by 51 publications

References 42 publications

Holocene vegetation dynamics in response to climate change and hydrological processes in the Bohai region

Holocene vegetation dynamics in response to climate change and hydrological processes in the Bohai region

Consistent long‐term Holocene warming trend at different elevations in the Altai Mountains in arid central Asia

Millennial‐ to centennial‐scale anti‐phase relationship between the Westerlies and the East Asian summer monsoon and its cultural response along the Silk Roads after a great earthquake in southern Altay ~ 3500 cal a BP

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