Late Quaternary lake-level and climate changes in arid central Asia inferred from sediments of Ebinur Lake, Xinjiang, northwestern China

2019 ◽  
Vol 92 (2) ◽  
pp. 416-429 ◽  
Author(s):  
Jianchao Zhou ◽  
Jinglu Wu ◽  
Long Ma ◽  
Mingrui Qiang
Keyword(s):  
Grain Size ◽  
Central Asia ◽  
North Atlantic ◽  
Lake Level ◽  
Climate Changes ◽  
Late Quaternary ◽  
Study Region ◽  
Climate Conditions ◽  
Arid Central Asia ◽  
Ebinur Lake

AbstractArid central Asia plays an important role in global climate dynamics, but large uncertainties remain in our understanding of the region's hydroclimate variability during the Late Quaternary. Here we present a new, high-resolution record of lacustrine sediment grain-size and element chemistry from Ebinur Lake, which was used to infer lake conditions and related climate changes in the study region between ca. 39.2 and 3.6 ka. End-member modeling analysis of grain-size data and PCA of elemental data show that lake level fluctuated dramatically from 39.2 to 34.0 ka. Subsequently, Ebinur Lake experienced a high stand from 34.0 to 28.0 ka, under humid climate conditions. The subsequent period, from 28.0 to 12.0 ka, was characterized by lake regression under dry climate conditions, whereas afterward (12.0–3.6 ka), considerably higher lake levels and humid conditions again prevailed. Millennial-scale abrupt climate changes, such as Heinrich events (H3 and H1) and the Younger Dryas, which are documented in the North Atlantic region, are also detected in the sediment record from Ebinur Lake. Comparisons with other sediment records from arid central Asia generally support the claim that climate change in this region was influenced mainly by variations in North Atlantic sea surface temperatures, through the westerlies.

Holocene palaeoenvironmental records from the high-altitude Wular Lake, Western Himalayas

The Holocene ◽  
2020 ◽  
Vol 30 (5) ◽  
pp. 733-743 ◽  
Author(s):  
Rayees Ahmad Shah ◽  
Hema Achyuthan ◽  
Aasif Mohmad Lone ◽  
Sanjeev Kumar ◽  
Pankaj Kumar ◽  
...  
Keyword(s):  
High Altitude ◽  
North Atlantic ◽  
Sedimentation Rate ◽  
Lake Level ◽  
Western Himalayas ◽  
Kashmir Valley ◽  
Climate Conditions ◽  
Wular Lake ◽  
Wet Climate ◽  
Lake Margin

We present a comprehensive record of Holocene (11,590–628 cal. yr BP) climate and hydrographic changes around the Wular Lake located in Kashmir Valley, India. Based on the multi-proxy investigations, we have identified three phases of wet climate conditions that prevailed from the commencement of the Holocene Epoch – 9000 cal. yr BP, 8100–6650 cal. yr BP and 6350–5000 cal. yr BP, whereas periods of dry climate were observed during 9000–8100 cal. yr BP, 6650–6350 cal. yr BP and ~5000 to 4000 cal. yr BP. The results also suggested that the lake widened and deepened significantly around 6350–5000 cal. yr BP. The results indicated desiccation and the exposure of the lake margin around 5000–4500 cal. yr BP. The sedimentation rate since 4500–628 cal. yr BP was quite low for detailed paleoclimate interpretations. Oscillations in lake extension and deepening appear to be due to changing intensity of westerly moisture in the region, and we correlate several of the low lake-level phases to the Bond events caused by North Atlantic ice rafting events.

The PMIP3 Simulated Climate Changes over Arid Central Asia during the Mid‐Holocene and Last Glacial Maximum

2020 ◽  
Vol 94 (3) ◽  
pp. 725-742
Author(s):  
Hongna XU ◽  
Tao WANG ◽  
Huijun WANG ◽  
Jiapeng MIAO ◽  
Jianhui CHEN ◽  
...  
Keyword(s):  
Central Asia ◽  
Last Glacial Maximum ◽  
Climate Changes ◽  
Glacial Maximum ◽  
Arid Central Asia ◽  
Last Glacial ◽  
Simulated Climate

scholarly journals Environmental variability and human activity over the past 140 years documented by sediments of Ebinur Lake in arid central Asia

2017 ◽  
Author(s):  
Wen Liu ◽  
Long Ma ◽  
Jinglu Wu ◽  
Jilili Abuduwaili
Keyword(s):  
Heavy Metal ◽  
Magnetic Susceptibility ◽  
Organic Matter ◽  
Central Asia ◽  
Human Activities ◽  
Arid Central Asia ◽  
Ebinur Lake ◽  
Metal Contents ◽  
The 1960S ◽  
Environmental Proxies

<p>A short (50-cm-long) sediment core from Ebinur Lake in arid central Asia has been analyzed for various environmental proxies, including organic matter content, δ<sup>13</sup>C in organic matter, magnetic susceptibility, heavy metal contents, and stable isotopic compositions of bulk carbonate (δ<sup>18</sup>O and δ<sup>13</sup>C). The results reveal that the evolutionary stages inferred from environmental indicators have an asynchronous nature. If the asynchrony of periodic changes in multi-environmental proxies is ignored, important information may be lost, especially regarding anthropogenic influences. On the basis of magnetic susceptibility and heavy metal contents, human activities appear to have resulted in increases in surface erosion and measurable heavy-metal accumulation from the mid-1960s, whereas the organic matter contents, which display an obvious shift in the late 1930s, correlate with regional climate. However, the changes in the stable isotopes of bulk carbonate are mainly controlled by the isotopic composition of the host water which is generally consistent with the lake level. From the late 1870s to the 1960s, the lake was in a natural evolutionary state. From the 1960s to the mid-2000s, the runoff feeding Ebinur Lake dropped rapidly, in association with a sharp increase in agricultural development. Finally, beginning in the early twenty-first century, the climate became wetter than during the earlier two stages, and as agricultural water demand decreased, surface runoff once again increased. It is noted that, although the different proxies respond differently to climate changes and human activities, any analysis of environmental evolution should consider them each individually, in order to fully understand the complex interactions between climate and human influence. </p>

scholarly journals Late Quaternary hydroclimate change inferred from lake sedimentary record in arid central Asia

Boreas ◽  
2021 ◽  
Author(s):  
Jianchao Zhou ◽  
Jinglu Wu ◽  
Hongliang Zhang ◽  
Haiao Zeng ◽  
Beibei Shen
Keyword(s):  
Central Asia ◽  
Late Quaternary ◽  
Sedimentary Record ◽  
Arid Central Asia

scholarly journals The Late Quaternary Sedimentary Record of Reykjanes Ridge, North Atlantic

Radiocarbon ◽  
2001 ◽  
Vol 43 (2B) ◽  
pp. 939-947 ◽  
Author(s):  
M A Prins ◽  
S R Troelstra ◽  
R W Kruk ◽  
K van der Borg ◽  
A F M de Jong ◽  
...  
Keyword(s):  
Grain Size ◽  
Ocean Circulation ◽  
North Atlantic ◽  
Late Quaternary ◽  
Ice Cores ◽  
Deep Ocean ◽  
Reykjanes Ridge ◽  
The North ◽  
The North Atlantic ◽  
Deep Ocean Circulation

Variability in surface and deep ocean circulation in the North Atlantic is inferred from grain-size characteristics and the composition of terrigenous sediments from a deep-sea core taken on Reykjanes Ridge, south of Iceland. End-member modeling of grain size data shows that deep-ocean circulation in this area decreased significantly during periods of maximum iceberg discharge. The episodes of reduced circulation correlate with the cold and abrupt warming phases of the Dansgaard-Oeschger cycles as recognized in the Greenland ice cores.

Optical dating of Holocene paleosol development and climate changes in the Yili Basin, arid central Asia

The Holocene ◽  
2019 ◽  
Vol 29 (6) ◽  
pp. 1068-1077 ◽  
Author(s):  
Leibin Wang ◽  
Jia Jia ◽  
Hui Zhao ◽  
Hao Liu ◽  
Yanwu Duan ◽  
...  
Keyword(s):  
Grain Size ◽  
Central Asia ◽  
Environmental Changes ◽  
Osl Dating ◽  
Coarse Grained ◽  
Frequency Distributions ◽  
Arid Central Asia ◽  
Excess Moisture ◽  
Age Model ◽  
Age Range

Optically stimulated luminescence (OSL) dating was conducted on the K-feldspar and quartz fractions of a Holocene loess-paleosol sequence in the Yili Basin, in the core area of arid central Asia (ACA). Age overestimation using the post-IR IR (pIR50IR170) signals from feldspar was observed for paleosols, because of poor bleaching prior to deposition. Therefore, a reliable age framework for the studied section was established using OSL dating of coarse-grained quartz, combined with a Bacon age model. A total of 18 OSL ages were obtained from a 2.5-m-loess/paleosol sequence with age range of 17.4–0.4 ka. Magnetic and grain-size proxies were used to reconstruct environmental changes during the studied interval, and the results indicate that paleosol development commenced at ~6 ka in the Yili Basin, which is consistent with previous studies in the Xinjiang region. Dust accumulation rates (DARs) and end-member analysis (EMA) of the grain-size frequency distributions were used to infer variations in the Westerlies during the Holocene, and the results suggest that the Westerlies were the main source of excess moisture in ACA during the studied interval.

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