The bleaching of different K-feldspar pIRIR signals of source materials of lacustrine sediment – A case study from Bosten Lake Basin in arid central Asia

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
He Yang ◽  
Guoqiang Li ◽  
Ming Jin ◽  
Haixia Zhang ◽  
Xiaoyan Wang ◽  
...  
Keyword(s):  
Central Asia ◽  
Coarse Grained ◽  
Lake Basin ◽  
Sediment Sources ◽  
Bosten Lake ◽  
Arid Central Asia ◽  
Eolian Sediments ◽  
Eolian Deposits ◽  
Source Materials

Abstract The residual ages and bleaching of K-feldspar post-IR IRSL (pIRIR) signals (pIR50IR170, pIR50IR290, and pIR200IR290) for a variety of modern sediment sources to the Bosten Lake basin in the southern Tian Shan of arid central Asia were assessed to identify the most appropriate facies to sample for ascertaining well-bleached, depositional ages associated with Quaternary paleolake development. Results indicate pIR50IR290 residual ages for pluvial fan, fluvial, and eolian sediments cluster at 40–6, 6–3, and 2–1 ka, respectively, and are depositional ages. Residual ages of pIR200IR290 signals are twice that of pIR50IR290 signals, while residual ages of pIR50IR170 signals are similar to that of pIR50IR290 signals for all samples. Eolian and fluvial samples show well-bleached, coarse-grained (90–125 μm) K-feldspar and poorly-bleached coarse grained K-feldspar from pluvial samples. High residual doses in fluvial and pluvial samples indicate it may not be advisable to apply pIRIR dating utilising different pIRIR signals to Holocene lacustrine samples. However, the residual ages measured for eolian deposits are small and can allow precise and robust assessment of paleolake development by targeting the K-feldspar pIR50IR170 signal to date Holocene samples and the pIR200IR290 and pIR50IR290 signals to date Pleistocene samples.

Humid Little Ice Age in arid central Asia documented by Bosten Lake, Xinjiang, China

2006 ◽  
Vol 49 (12) ◽  
pp. 1280-1290 ◽  
Author(s):  
Fahu Chen ◽  
Xiaozhong Huang ◽  
Jiawu Zhang ◽  
J. A. Holmes ◽  
Jianhui Chen
Keyword(s):  
Central Asia ◽  
Little Ice Age ◽  
Ice Age ◽  
Bosten Lake ◽  
Arid Central Asia

scholarly journals Stationarity in the variability of arid precipitation: a case study of arid Central Asia

2021 ◽  
Author(s):  
Yao Jun-Qiang ◽  
Chen Jing ◽  
Zhang Tong-Wen ◽  
Dilinuer Tuoliewubieke ◽  
Mao Wei-Yi
Keyword(s):  
Central Asia ◽  
Arid Central Asia

Changes in the hydrodynamic intensity of Bosten Lake and its impact on early human settlement in the northeastern Tarim Basin, eastern Arid Central Asia

2020 ◽  
Author(s):  
Haichao Xie
Keyword(s):  
Water Supply ◽  
Central Asia ◽  
Tarim Basin ◽  
Early Summer ◽  
Human Settlement ◽  
Human Occupation ◽  
Bosten Lake ◽  
Arid Central Asia ◽  
Temperature And Precipitation ◽  
Early Human

<p>The climate of eastern arid central Asia (ACA) is extremely dry and early human settlement and civilization in the region were dependent upon a potentially unstable water supply. Thus, knowledge of the history of hydrological fluctuations is essential for understanding the relationship between humans and the environment in the region. Here we present a record of variation in lake hydrodynamic intensity based on the grain size of suspended lacustrine silt isolated from the sediments of Bosten Lake, which feeds a river flowing to the northeastern Tarim Basin. The results show that lake hydrodynamic intensity was very weak, and/or that the lake dried-out completely, during the early Holocene (12.0–8.2 ka). Then it increased with two distinct centennial-millennial-scale intervals of weak intensity occurring during 4.7–3.5 ka and 1.2–0.5 ka. Notably, increases in lake hydrodynamic intensity occurred some 2.2 kyr prior to an increase in local precipitation and effective moisture. We speculate that this was a consequence of relatively high early summer temperatures during 8.2–6.0 ka that resulted in an increased water supply from melting snow and ice in mountainous areas of the catchment. Thus, we conclude that changes in the hydrodynamic intensity of Bosten Lake during the Holocene were affected by changes in both temperature and precipitation. The variations in the hydrodynamic intensity of Bosten Lake since the middle Holocene also influenced water availability for the human population that occupied the downstream area of the northeastern Tarim Basin. A persistent increase in hydrodynamic intensity during 2123–1450 B.C. may have been responsible for human occupation of the region that contains the noted archaeological sites of Xiaohe and Gumugou Cemetery. In addition, a drastic decrease in hydrodynamic intensity at around 400 A.D. likely caused the emigration of the inhabitants of Loulan.</p>

Holocene moisture variations in western arid central Asia inferred from loess records from NE Iran

2020 ◽  
Author(s):  
Qiang Wang ◽  
Haitao Wei ◽  
Farhad Khormali ◽  
Leibin Wang ◽  
Haichao Xie ◽  
...  
Keyword(s):  
Central Asia ◽  
Late Holocene ◽  
Isotope Composition ◽  
Stable Carbon Isotope ◽  
Early Holocene ◽  
Coarse Grained ◽  
Mean Annual Precipitation ◽  
Arid Central Asia ◽  
Ne Iran ◽  
Environmental Proxies

<p>Holocene variations in precipitation in central and eastern arid central Asia (ACA) have been widely investigated, but the pattern in western ACA remains unclear. We present records of the stable carbon isotope composition of bulk organic matter (δ<sup>13</sup>C<sub>org</sub>), magnetic parameters, and sediment color, from five loess-paleosol sequences in NE Iran, in western ACA, with the aim of reconstructing Holocene precipitation. The Yellibadragh (YE) section (the thickest among the five sequences) was selected for OSL dating of the coarse-grained quartz (63-90 μm) fraction, and its δ<sup>13</sup>C<sub>org </sub>record was used to quantitatively reconstruct mean annual precipitation (MAP). The record indicates a dry early Holocene (~11.8-7.4 ka), with nearly constant MAP (~93 mm), followed by a wetting trend from the mid-Holocene (~7.4 ka) onwards, with the wettest period in the late Holocene (~4.0-0.0 ka, ~390 mm). The stratigraphic observations and environmental proxies support the reconstruction. The other loess profiles show stratigraphic features and trends of environmental proxies which are similar to those of the YE profile. A dry early Holocene and wetting trend since the mid-Holocene, with the wettest climate in the late Holocene in NE Iran, are both consistent with records from sand dunes and lake sediments from adjacent areas, and with loess records from central and eastern ACA. Comparison with loess records from monsoonal Asia supports the interpretation of a “westerlies-dominated climatic regime” (WDCR) which was proposed mainly on the basis of lake sediment records from the region. Changes in solar insolation may have been responsible for the persistent wetting trend during the Holocene in western ACA.</p>

scholarly journals Satellite-based Precipitation Datasets Evaluation Using Gauge Observation and Hydrological Modeling in a Typical Arid Land Watershed of Central Asia

2021 ◽  
Vol 13 (2) ◽  
pp. 221
Author(s):  
Jiabin Peng ◽  
Tie Liu ◽  
Yue Huang ◽  
Yunan Ling ◽  
Zhengyang Li ◽  
...  
Keyword(s):  
Central Asia ◽  
Hydrological Modeling ◽  
Assessment Tool ◽  
Swat Model ◽  
Tropical Rainfall Measuring Mission ◽  
Northwest China ◽  
Lake Basin ◽  
Climate Data ◽  
Bosten Lake ◽  
Satellite Precipitation

Hydrological modeling has always been a challenge in the data-scarce watershed, especially in the areas with complex terrain conditions like the inland river basin in Central Asia. Taking Bosten Lake Basin in Northwest China as an example, the accuracy and the hydrological applicability of satellite-based precipitation datasets were evaluated. The gauge-adjusted version of six widely used datasets was adopted; namely, Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks–Climate Data Record (CDR), Climate Hazards Group Infrared Precipitation with Stations (CHIRPS), Global Precipitation Measurement Ground Validation National Oceanic and Atmospheric Administration Climate Prediction Center (NOAA CPC) Morphing Technique (CMORPH), Integrated Multi-Satellite Retrievals for GPM (GPM), Global Satellite Mapping of Precipitation (GSMaP), the Tropical Rainfall Measuring Mission (TRMM) and Multi-satellite Precipitation Analysis (TMPA). Seven evaluation indexes were used to compare the station data and satellite datasets, the soil and water assessment tool (SWAT) model, and four indexes were used to evaluate the hydrological performance. The main results were as follows: (1) The GPM and CDR were the best datasets for the daily scale and monthly scale rainfall accuracy evaluations, respectively. (2) The performance of CDR and GPM was more stable than others at different locations in a watershed, and all datasets tended to perform better in the humid regions. (3) All datasets tended to perform better in the summer of a year, while the CDR and CHIRPS performed well in winter compare to other datasets. (4) The raw data of CDR and CMORPH performed better than others in monthly runoff simulations, especially CDR. (5) Integrating the hydrological performance of the uncorrected and corrected data, all datasets have the potential to provide valuable input data in hydrological modeling. This study is expected to provide a reference for the hydrological and meteorological application of satellite precipitation datasets in Central Asia or even the whole temperate zone.

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.

scholarly journals The luminescence dating chronology of a deep core from Bosten Lake (NW China) in arid central Asia reveals lake evolution over the last 220 ka

Boreas ◽  
2016 ◽  
Vol 46 (2) ◽  
pp. 264-281 ◽  
Author(s):  
Guoqiang Li ◽  
Yanwu Duan ◽  
Xiaozhong Huang ◽  
Jan-Pieter Buylaert ◽  
Wei Peng ◽  
...  
Keyword(s):  
Central Asia ◽  
Luminescence Dating ◽  
Bosten Lake ◽  
Nw China ◽  
Arid Central Asia ◽  
Lake Evolution

scholarly journals Outflows of groundwater in lakes: case study of Lake Raduńske Górne

2014 ◽  
Vol 14 (4) ◽  
pp. 169-179
Author(s):  
Roman Cieśliński ◽  
Jacek Piekarz
Keyword(s):  
Water Supply ◽  
Lake Water ◽  
Field Research ◽  
Field Work ◽  
Lake Basin ◽  
Lake District ◽  
The North ◽  
North Eastern ◽  
Source Materials

Abstract The aim of the study was to locate and describe groundwater outflows in a selected lake basin. The study hypothesis was based on the fact that, according to the specialist literature, one of the forms of lake water supply is through groundwater outflows. It was also assumed that the lakes of the Kashubian Lake District are characterised by such a form of lake water supply. The time scope of the work included the period from January 2011 to September 2012. The spatial scope of the work included the area of Lake Raduńskie Górne, located in the Kashubian Lake District in north Poland. The research plot was in the north-eastern part of the lake. Office works were aimed at gathering and studying source materials and maps. Cartographic materials were analysed with the use of the MapInfo Professional 9.5. The purpose of the field work was to find the groundwater outflows in the basin of Lake Raduńskie Górne. During the field research diving was carried out in the lake. During the dive audiovisual documentation was conducted using a Nikon D90 camera with Ikelite underwater housing for Nikon D90 and an Ikelite DS 161 movie substrobe, as well as a GoPro HD HERO 2 Outdoor camera. During the project, four groundwater outflows were found. In order to examine these springs audiovisual and photographic documentation was made. To systematise the typology of the discovered springs, new nomenclature was suggested, namely under-lake springs with subtypes: an under-lake slope spring and under-lake offshore spring

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