East Asian winter monsoon evolution since the late Pliocene based on a pollen record from Lake Xingkai, northeast Asia

2019 ◽  
Vol 93 ◽  
pp. 40-59 ◽  
Author(s):  
Shouzhen Xin ◽  
Ji Shen ◽  
Wenfang Zhang ◽  
Weiwei Sun ◽  
Xiayun Xiao
Keyword(s):  
High Resolution ◽  
East Asian Winter Monsoon ◽  
East Asian ◽  
Northeast Asia ◽  
Winter Monsoon ◽  
Chinese Loess Plateau ◽  
Pollen Record ◽  
Chinese Loess ◽  
Asian Winter Monsoon ◽  
Climatic Cooling

AbstractA 328.58 m drill core (XK12) was recovered from lacustrine–alluvial sediments in the Xingkai Basin, northeast China, with the aim of obtaining a high-resolution pollen record of East Asian winter monsoon (EAWM) evolution since 3.6 Ma. An index based on the pollen record of thermophilous trees and terrestrial herbs is used as an indicator of winter temperature conditions controlled by the EAWM, at the glacial–interglacial scale. Primary age control was established based on lithostratigraphy and magnetostratigraphy, and then the pollen index was correlated to the LR04 global benthic δ18O record and finally tuned to Earth orbital obliquity to produce a high-resolution astronomical time scale. The pollen record indicates that the EAWM underwent two stepwise enhancements at 2.8 and 1.6 Ma. These events are consistent with paleoclimatic records of mean quartz grain size from the Chinese Loess Plateau, and they are also in accord with the initiation and intensification of Northern Hemisphere glaciation. Our findings suggest that the variability of the EAWM since 3.6 Ma was primarily controlled by changes in global ice volume and climatic cooling.

scholarly journals Early Holocene weakening and mid- to late Holocene strengthening of the East Asian winter monsoon

Geology ◽  
2020 ◽  
Vol 48 (11) ◽  
pp. 1043-1047 ◽  
Author(s):  
Shugang Kang ◽  
Jinhua Du ◽  
Ning Wang ◽  
Jibao Dong ◽  
Duo Wang ◽  
...  
Keyword(s):  
Northern Hemisphere ◽  
High Latitude ◽  
Late Holocene ◽  
East Asian Winter Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
Early Holocene ◽  
Luminescence Dating ◽  
Chinese Loess ◽  
Asian Winter Monsoon

Abstract Sub-orbital-scale variations of the East Asian winter monsoon (EAWM) and its mechanisms during the Holocene are controversial, partly due to the lack of high-quality records from Chinese loess. Here, we present high-resolution reconstruction of Holocene EAWM intensity based on optically stimulated luminescence dating and grain-size analysis from three loess sections taken from the Chinese Loess Plateau. The EAWM showed a persistent weakening trend during the early Holocene (ca. 11.7–6.5 kyr B.P.) and a strengthening trend during the mid- to late Holocene (since ca. 6.5 kyr B.P.). We propose that this was caused by changes in high-latitude Northern Hemisphere ice volume and middle- to high-latitude Northern Hemisphere atmospheric temperatures, respectively. We also observed an anti-correlation between EAWM and East Asian summer monsoon. Our findings provide a robust solution to the debate regarding Holocene EAWM changes and contribute to the understanding of potential future variations in EAWM intensity.

Zr/Rb ratio in the Chinese loess sequences and its implication for changes in the East Asian winter monsoon strength

2006 ◽  
Vol 70 (6) ◽  
pp. 1471-1482 ◽  
Author(s):  
Jun Chen ◽  
Yang Chen ◽  
Lianwen Liu ◽  
Junfeng Ji ◽  
William Balsam ◽  
...  
Keyword(s):  
East Asian Winter Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
Chinese Loess ◽  
Asian Winter Monsoon ◽  
Monsoon Strength

Eolian Quartz Flux to Lake Biwa, Central Japan, over the Past 145,000 Years

1997 ◽  
Vol 48 (1) ◽  
pp. 48-57 ◽  
Author(s):  
Jule Xiao ◽  
Yoshio Inouchi ◽  
Hisao Kumai ◽  
Shusaku Yoshikawa ◽  
Yoichi Kondo ◽  
...  
Keyword(s):  
Lake Biwa ◽  
East Asian Winter Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
Central Japan ◽  
Chinese Loess ◽  
Asian Winter Monsoon ◽  
The Past ◽  
Source Regions ◽  
Quartz Flux

Eolian quartz flux (EQF, g cm−2(103 yr)−1) to Lake Biwa, central Japan, provides direct information on variations of the East Asian winter monsoon. Lake Biwa sediments spanning the past ca. 145,000 yr are characterized by two main periods when EQF values were significantly greater than 5.50 g cm−2(103 yr)−1, and two main intervals during which EQF values were lower. Two periods with EQF values >5.50 g cm−2(103 yr)−1occurred from ca. 145,000 to 125,000 and 73,000 to 13,000 yr B.P., while times of lower EQF values occurred from ca. 125,000 to 73,000 yr B.P. and around ca. 5500 yr B.P. Between ca. 125,000 and 73,000 yr B.P., three minimum EQF values and two intervening peaks of slightly higher EQF values are recorded. EQF increased markedly from ca. 73,000 to 13,000 yr B.P., whereas between ca. 53,000 and 20,000 yr B.P. the values recorded were relatively lower than those recorded during either the preceding or the subsequent episodes. The data imply that the East Asian winter monsoon strengthened during the periods when EQF values were high, and weakened during the intervals with low EQF values. The EQF record of Lake Biwa can be correlated with the grain-size record of the quartz fraction in Chinese loess and with the SPECMAP marine δ18O record. However, the EQF record apparently lags ca. 5000 yr behind the loess and δ18O records during stage 6/5 and 2/1 transitions and ca. 10,000 yr during stage 5/4 transition. These apparent lags could be due to problems with the chronology; alternatively, they may imply that the eolian quartz flux depended more on the extent of dust source regions than on wind intensity during these transitions.

scholarly journals Distinct responses of East Asian summer and winter monsoons to astronomical forcing

2011 ◽  
Vol 7 (4) ◽  
pp. 1363-1370 ◽  
Author(s):  
Z. G. Shi ◽  
X. D. Liu ◽  
Y. B. Sun ◽  
Z. S. An ◽  
Z. Liu ◽  
...  
Keyword(s):  
Summer Monsoon ◽  
East Asian Winter Monsoon ◽  
Model Simulation ◽  
East Asian Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
Chinese Loess Plateau ◽  
Asian Winter Monsoon ◽  
Asian Summer ◽  
Astronomical Forcing

Abstract. Influences of the Earth's astronomical forcing on the evolution of East Asian monsoon have been demonstrated with various geological records and climate models. Here, we present time series of climatic proxies from the Chinese Loess Plateau and Sanbao/Hulu caves and the winter/summer monsoon intensity index from a long-term transient climate model simulation. Both the observations and modelling results reveal consistently distinct responses of East Asian summer and winter monsoons to astronomical forcing. Different from the dominant local impact on the summer monsoon at the precession scale (~20 ka period), the East Asian winter monsoon is driven predominantly by the obliquity forcing (~40 ka period). We propose that the obliquity forcing controls the meridional insolation difference and, therefore, exerts a more significant effect on the evolution of the East Asian winter monsoon than previously expected.

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