Shrinkage of East Asia Winter Monsoon Associated With Increased ENSO Events Since the Mid‐Holocene

Wu, Jing; Liu, Q.; Cui, Qiaoyu; Xu, Daokui; Wang, Luo; Shen, Caiming; Chu, Guoqiang; Liu, J. Q.

doi:10.1029/2018jd030148

Cited by 46 publications

(33 citation statements)

References 60 publications

(107 reference statements)

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“…Moreover, ENSO variance exhibits ~500-yr cyclic change during the entire Holocene (Supplementary Fig. 17) and regulates EAM changes on the centennial scale 5,39,49,50 . ENSO can drive the movement of the rainbelt caused by intensifying the interaction between the western Pacific anticyclone and dipolar sea surface temperature anomalies in the Indo-Pacific warm pool and the Northwest Pacific 48 .…”

Section: Resultsmentioning

confidence: 99%

Synchronous 500-year oscillations of monsoon climate and human activity in Northeast Asia

et al. 2019

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Prehistoric human activities were likely influenced by cyclic monsoon climate changes in East Asia. Here we report a decadal-resolution Holocene pollen record from an annually-laminated Maar Lake in Northeast China, a proxy of monsoon climate, together with a compilation of 627 radiocarbon dates from archeological sites in Northeast China which is a proxy of human activity. The results reveal synchronous ~500-year quasi-periodic changes over the last 8000 years. The warm-humid/cold-dry phases of monsoon cycles correspond closely to the intensification/weakening of human activity and the flourishing/decline of prehistoric cultures. Six prosperous phases of prehistoric cultures, with one exception, correspond approximately to warm-humid phases caused by a strengthened monsoon. This ~500-year cyclicity in the monsoon and thus environmental change triggered the development of prehistoric cultures in Northeast China. The cyclicity is apparently linked to the El Niño-Southern Oscillation, against the background of long-term Holocene climatic evolution. These findings reveal a pronounced relationship between prehistoric human activity and cyclical climate change.

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Section: Resultsmentioning

confidence: 99%

Synchronous 500-year oscillations of monsoon climate and human activity in Northeast Asia

et al. 2019

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“…The increased content of detrital elements (Ti, Al, and Fe) since 3 kyr BP (Figure ) suggests substantially increased detrital inputs, which likely reflect enhanced winds associated with the winter monsoon, or increased catchment erosion (Shen et al, ). However, the diatom record of Huguang Maar Lake in South China (Wang et al, ) and the pollen record of Lake Moon in Northeast China (Wu et al, ) indicate a weakened EAWM during the late Holocene. Therefore, we conclude that the detrital elements likely represent intensified detrital sediment influx from the lake catchment rather than the supply of material from outside the catchment by eolian transport associated with the winter monsoon.…”

Section: Discussionmentioning

confidence: 99%

Impact of Abrupt Late Holocene Monsoon Climate Change on the Status of an Alpine Lake in North China

et al. 2020

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The late Holocene is generally regarded as an interval of monsoon recession and decreased precipitation in North China. However, the extent to which this affected the status of lakes in North China is unclear. In the study, we analyzed multiple proxies (δ13C, magnetic susceptibility [χlf], and exogenous element concentrations) from Lake Mayinghai, an undisturbed alpine lake in North China. We also compared the results with previously published paleoenvironmental records from the Chinese Loess Plateau. We aimed to determine the extent of the influence of variations in the East Asian summer monsoon (EASM) on the status of Lake Mayinghai during the late Holocene. The results demonstrate that negative δ13C values at Lake Mayinghai correspond to high sedimentary tree pollen content and high reconstructed precipitation, indicating that variations in δ13C likely reflect variations in vegetation and the EASM in North China. A comparison of the δ13C record with other proxies from the same core reveals an abrupt change in the EASM at ~3 kyr before present (BP), which is also evident in other regional climate records from the Chinese Loess Plateau. The rapid decline in EASM intensity at ~3 kyr BP is also consistent with changes in the status of Lake Mayinghai, Lake Gonghai, Lake Ganhai, and Lake Daihai, in that these lakes underwent an abrupt retreat after 3 kyr BP, demonstrating that the rapid decline in EASM intensity at ~3 kyr BP had a large impact on lake evolution in North China.

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“…The GHM has a temperate continental monsoon climate, and is influenced by both the East Asian monsoon and the westerlies, with cold/dry winters from November to April and hot/wet summers from July to August. The mean annual temperature in the southern region of the GHM is −4‐0°C and the annual precipitation is approximately 300–600 mm (Wu et al, 2019). The bedrock in the GHM is comprised mostly of basalts, with alluvial sediments deposited during the Holocene (Wang et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

Environmental change and human land‐use over the past 200 years in the Great Hinggan Mountains, Northeastern China

et al. 2020

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Mountain ecosystems are sensitive to environmental changes and are affected by direct and indirect anthropogenic activities. This study sought to understand the impacts of human occupation, environmental and climate change on the Great Hinggan Mountains (GHM) in Northeastern China. The last 200 years of environmental changes are reconstructed by analyzing sediment cores from five small mountain lakes. Cores were dated using 210Pb and 137Cs radioisotopes, microscopic charcoal identified regional fire activity and fossil pollen analysis reconstructed temporal and spatial changes in vegetation. Peaks in 137Cs, 226Ra and microscopic charcoal flux were found to follow similar trends between sites. The radioisotope records reflect redistribution processes, such as erosion and fire events, which overwhelm the atmospheric fallout signal in the GHM. Microscopic charcoal increased from 1950 CE and peaked at all sites after 2000 CE suggesting that current fire management, coupled with a warmer climate due to global warming, may be leading to more wildfire events in the region. Pinus, Quercus and Betula declined at all sites as human occupation occurred in the early 1900s. Initially, open forest and grassland expanded in response to overexploitation of forests, followed by arboreal pollen reaching maximum values after 2000 CE. This study concludes that the present‐day mixed coniferous broad‐leaved forest dominating the southern region of the GHM is a product of changing fire activity, excessive logging and, more recently, forestry management and vegetation regeneration. Results suggest further management strategies are needed to address land degradation and wildfire events in mountain regions of Northeastern China.

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Shrinkage of East Asia Winter Monsoon Associated With Increased ENSO Events Since the Mid‐Holocene

Cited by 46 publications

References 60 publications

Synchronous 500-year oscillations of monsoon climate and human activity in Northeast Asia

Synchronous 500-year oscillations of monsoon climate and human activity in Northeast Asia

Impact of Abrupt Late Holocene Monsoon Climate Change on the Status of an Alpine Lake in North China

Environmental change and human land‐use over the past 200 years in the Great Hinggan Mountains, Northeastern China

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