High and low- latitude forcing of East Asian monsoon precipitation change during the late Pliocene

2021 ◽  
Author(s):  
Hansheng Wang ◽  
Junsheng Nie ◽  
Zeng Luo
Keyword(s):  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Large Population ◽  
Ice Sheets ◽  
Chinese Loess Plateau ◽  
Monsoon Precipitation ◽  
Low Latitude ◽  
Late Pliocene ◽  
Precipitation Record

<p>3.6 Ma represents a time period when Earth transitioned from single pole ice sheets to permanent ice sheets existing in both hemispheres. However, it remains unclear how this transition had its impact on East Asian summer monsoon system, which controls living of a large population. Here, we present a high-resolution (2~4 kyr) monsoon precipitation record from the Chaona section on the central Chinese Loess Plateau during the 3.95-2.95 Ma, using the magnetic parameter-based precipitation proxy (χfd/HIRM). The results reveal intensified precessional and semiprecessional fluctuations during high eccentricity, emphasizing direction role of low latitude insolation played in forcing Asian monsoon precipitation. The precipitation records also show that the 41-kyr cycles intensified after 3.3 Ma, in contrast with decreased obliquity variation amplitude of summer insolation. We interpret the enlarged 41-kyr precipitation cycles in our records as a result of high latitude ice sheet forcing. Together, our work provides an example demonstrating both high and low latitude forcing of Asian monsoon precipitation during the late Pliocene.</p>

scholarly journals Combined high- and low-latitude forcing of East Asian monsoon precipitation variability in the Pliocene warm period

2020 ◽  
Vol 6 (46) ◽  
pp. eabc2414
Author(s):  
Yichao Wang ◽  
Huayu Lu ◽  
Kexin Wang ◽  
Yao Wang ◽  
Yongxiang Li ◽  
...  
Keyword(s):  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Central China ◽  
Critical Threshold ◽  
Monsoon Precipitation ◽  
Low Latitude ◽  
Monsoon Variability ◽  
Precipitation Record ◽  
Response To Temperature

East Asian monsoon variability in the Pliocene warm world has not been sufficiently studied because of the lack of direct records. We present a high-resolution precipitation record from Pliocene fluvial-lacustrine sequences in the Weihe Basin, Central China, a region sensitive to the East Asian monsoon. The record shows an abrupt monsoon shift at ~4.2 million years ago, interpreted as the result of high-latitude cooling, with an extratropical temperature decrease across a critical threshold. The precipitation time series exhibits a pronounced ~100–thousand year periodicity and the presence of precession and half-precession cycles, which suggest low-latitude forcing. The synchronous phase but mismatched amplitudes of the East Asian monsoon precipitation proxy and eccentricity suggest a nonlinear but sensitive precipitation response to temperature forcing in the Pliocene warm world. These observations highlight the role of high- and low-latitude forcing of East Asian monsoon variations on tectonic and orbital time scales.

scholarly journals Monthly insolation linked to the time-transgressive nature of the Holocene East Asian monsoon precipitation maximum

Geology ◽  
2021 ◽  
Author(s):  
Xin Zhou ◽  
Tao Zhan ◽  
Luyao Tu ◽  
John P. Smol ◽  
Shiwei Jiang ◽  
...  
Keyword(s):  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Western Pacific Subtropical High ◽  
Spatiotemporal Patterns ◽  
Monsoon Precipitation ◽  
Low Latitude ◽  
The Holocene ◽  
Forcing Mechanisms ◽  
Precipitation Changes

More than 10% of the world’s population lives in the East Asian monsoon (EAM) region, where precipitation patterns are critical to agricultural and industrial activities. However, the dominant forcing mechanisms driving spatiotemporal changes in the EAM remain unclear. We selected Holocene records tracking monsoon precipitation in the EAM region reconstructed from pollen data to explore the spatiotemporal patterns of monsoon precipitation changes. Our analysis shows a time-transgressive pattern of maximum precipitation, with earlier occurrence in the southern area and later occurrence in the northern area. The monthly insolation changes force monsoon precipitation in different parts of the EAM region through a shift in the Western Pacific Subtropical High. We conclude that low-latitude monthly insolation changes (rather than average summer insolation changes) were the main forcing mechanisms of the spatiotemporal patterns of the monsoon precipitation maximum during the Holocene.

scholarly journals Supplemental Material: Monthly insolation linked to the time-transgressive nature of the Holocene East Asian monsoon precipitation maximum

2021 ◽  
Author(s):  
Xin Zhou ◽  
et al.
Keyword(s):  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Monsoon Precipitation ◽  
The Holocene ◽  
Precipitation Changes

Supplemental information on the records used, the chronological framework of different sites, reconstructions of precipitation changes, and the defined time of the Holocene monsoon precipitation maximum.<br>

scholarly journals Seesaw pattern in dust accumulation on the Chinese Loess Plateau forced by late glacial shifts in the East Asian monsoon

Geology ◽  
2018 ◽  
Vol 46 (10) ◽  
pp. 871-874 ◽  
Author(s):  
Zhiwei Xu ◽  
Thomas Stevens ◽  
Shuangwen Yi ◽  
Joseph A. Mason ◽  
Huayu Lu
Keyword(s):  
Loess Plateau ◽  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Late Glacial ◽  
Chinese Loess Plateau ◽  
Chinese Loess ◽  
The Chinese Loess Plateau ◽  
Dust Accumulation

A study of Holocene Asian summer and winter monsoon change by an analog of climate factors between millennial and modern interannual scales

2019 ◽  
Vol 44 (3) ◽  
pp. 315-337
Author(s):  
Yu Li ◽  
Yichan Li ◽  
Wangting Ye ◽  
Simin Peng
Keyword(s):  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Driving Mechanism ◽  
Climatic Data ◽  
Low Latitude ◽  
Global Circulation ◽  
Asian Summer ◽  
Winter Insolation ◽  
Monsoon Indices

The East Asian monsoon exerts a profound influence on environmental change in the East Asian region. Various factors have been hypothesized as the dominant Asian monsoon forcings, however, the forcings can change from interannual to millennial timescales. The linkages between monsoon forcings at different timescales remain unclear. To better understand the connection of the variabilities and mechanisms of the East Asian monsoon at various timescales, we present a modern analog. Various climatic data, monsoon indices, and circulation factor calculations were used to identify the variabilities and controlling factors of the modern East Asian summer and winter monsoons. Paleo-climatic proxies from a region sensitive to both summer and winter monsoons were used in concert with monsoon simulation data to reconstruct and analyze paleo-monsoon variations and mechanisms. Results showed that the weakening of the Holocene Asian summer and winter monsoons is closely linked to low-latitude summer insolation and mid-latitude winter insolation, while modern summer and winter monsoons are related to global circulation, sea surface temperature, and sea ice change. We confirm that the driving mechanism of the monsoon was dependent on timescale.

Variation of East Asian monsoon precipitation during the past 21 k.y. and potential CO2 forcing

Geology ◽  
2013 ◽  
Vol 41 (9) ◽  
pp. 1023-1026 ◽  
Author(s):  
H. Lu ◽  
S. Yi ◽  
Z. Liu ◽  
J. A. Mason ◽  
D. Jiang ◽  
...  
Keyword(s):  
Asian Monsoon ◽  
East Asian Monsoon ◽  
East Asian ◽  
Monsoon Precipitation ◽  
The Past ◽  
Co2 Forcing
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