Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia

Sun, Haichao; Song, Yougui; Chen, Xiuling; Cheng, Liangqing; Liu, Huifang

doi:10.1016/j.palaeo.2020.109731

Cited by 28 publications

(3 citation statements)

References 107 publications

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“…In arid regions, SE mainly occurred on basin geomorphic units according to mountain-oasis-lake regions [40]. Influenced by climatic changes and human activities, some rivers in CA are cut off at lower reaches and lakes at lower reaches dry up gradually [41], thus intensifying local SE and exposing river basin ecosystems to more risks [42]. Although CA is generally warm and humid, such trends still cannot change the degree of droughts [43].…”

Section: Introductionmentioning

confidence: 99%

Effects of Vegetation Change on Soil Erosion by Water in Major Basins, Central Asia

Qian

Wang

et al. 2022

Remote Sensing

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The uncertainties in soil erosion (SE) are further intensified by various factors, such as global warming, regional warming and humidification, and vegetation cover changes. Moreover, quantitative evaluations of SE in major basins of Central Asia (CA) under changing environments have rarely been conducted. This study conducted quantitative evaluation of SE in four major basins (Syr Darya Basin (SDB), Amu Darya Basin (ADB), Ili River Basin (IRB) and Tarim River Basin (TRB) using the Revised Universal Soil Loss Equation (RUSLE) and analyzed the main driving factors. SE quantities in the basins presented relatively consistent upward fluctuating trends from 1982 to 2017. Vegetation cover variation fluctuated significantly from 1982 to 2017. Specifically, vegetation cover decreased continuously in SDB, ADB, and IRB, but increased gradually in TRB. Pixels with positive spatial variation of vegetation mainly occurred around lakes and oases near rivers. The Normalized Difference Vegetation Index (NDVI) showed higher correlation with precipitation (80.5%) than with temperature (48.3%). During the study period, the area of arable land (AL) exhibited the largest change among all land use types in CA. Under long-term human activities, the proportion of NDVI of other land types converting to AL was the highest. In the structural equation model (SEM), precipitation, temperature, Shannon Diversity Index (SHDI), and NDVI strongly influenced SE. Overall, the major basins in CA were jointly affected by climate, human activities, and vegetation. Specifically, climatic factors exerted the strongest influence, followed by SHDI (human activities). SE was found to be relatively serious in ADB, SDB, and IRB, with SE in SDB even approaching that in the Loess Plateau. Under the background of global changes, appropriate water and land resource management and optimization configurations should be implemented in CA with reference to TRB in order to relieve local SE problems.

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Section: Introductionmentioning

confidence: 99%

Effects of Vegetation Change on Soil Erosion by Water in Major Basins, Central Asia

Qian

Wang

et al. 2022

Remote Sensing

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“…Therefore, a strong wind does not necessarily lead to a larger mean grain size. Moreover, previous research has indicated that extensive large vegetation coverage can effectively reduce the emission of coarse‐dust particles (Sun et al., 2020; Újvári et al., 2016; Yang & Ding, 2008) and that changing dust sources mostly influence the grain size of loess sediments (Cheng, Song, Sun, et al., 2020). Therefore, the mean grain size of the Tacheng loess may not be sensitive in indicating the wind strength.…”

Section: Discussionmentioning

confidence: 99%

Variations of the Intensity of the Siberian High During the Last Glacial Revealed by the Sorting Coefficient of Loess‐Paleosol Deposits in Eastern Central Asia

Cheng

Song

Yang

et al. 2022

Paleoceanog and Paleoclimatol

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Eastern Central Asia has an arid environment and experiences frequent dust storms. Modern observations indicate that the dust storm frequency in eastern Central Asia is modulated mainly by the intensity of the Siberian High (SH). However, a lack of knowledge about the process influencing the variation of the SH limits our ability to understand the genesis of dust storms and their predictions. In this study, we present data on heavy mineral assemblages and sediment grain size in a loess section in eastern Central Asia, spanning the last glacial. Combined with previously published results, we propose that the sorting coefficient in loess‐paleosol sequences is a more sensitive proxy for wind intensity—and thus for the intensity of the SH—than the commonly used proxies of the mean grain size and grain size fractions, which are also influenced by changes in dust source and vegetation cover. Our sorting coefficient series clearly reveals Heinrich events, as well as the prominent ∼5 kyr Bond cycle. Larger sorting coefficients correspond to more depleted Sanbao Cave stalagmite δ18O values, revealing an antiphase relationship between the intensity of the SH and the East Asian Summer Monsoon during the last glacial. The sorting coefficient series also support the significant influence of Arctic sea‐ice cover on the intensity of the SH.

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“…a * is mainly controlled by the type and concentration of iron oxide minerals, especially hematite (Ji et al, 2005 ; Sun et al, 2020 ). Previous work suggests that a * is related to river action on the QTP: Ji et al ( 2005 ) linked a * with river-transported terrestrial materials in the lacustrine sediments of Qinghai Lake on the northeastern QTP, reflecting regional monsoon and precipitation changes.…”

Section: Discussionmentioning

confidence: 99%

Vegetation History and Survival Patterns of the Earliest Village on the Qinghai–Tibetan Plateau

et al. 2022

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The upper Yellow River valley in the northeastern Qinghai–Tibetan Plateau (QTP) is an important corridor for prehistoric migration to the hinterland plateau. However, most studies have focused on the Neolithic Age, with limited evidence for earlier periods. The Shalongka (SLK) site on the northeastern QTP spans the Epipaleolithic to Bronze Age and contains cultural deposits, so provides a good basis for unraveling the evolutionary history of the human-land relationship. In this study, we sampled the 420-cm-thick section T1406E at the SLK site and undertook lithologic stratigraphic description and analysis of grain size, redness, magnetic susceptibility, geochemical elements, pollen and charcoal. Dating control was provided by accelerated mass spectrometry 14C and optically stimulated luminescence methods. Results show that SLK site was affected by the local fluvial sedimentary environment. The absolute dating results of the SLK site have revealed that humans occupied the site during the Epipaleolithic (8.5–7.3 cal ka BP), Yangshao culture (5.9–5.1 ka) and Qijia Culture (4.1–3.9 cal ka BP). Pollen analysis showed that the humans lived in a landscape that was predominated by forest-steppe. Consolidating with multidisciplinary evidence, we learned that Epipaleolithic sites were occupied by microlithic hunter-gatherers and comprised by relatively fixed seasonal central campsites, and their mobility was significantly decreased from the early to late period. Subsequently, farmers of the Yangshao culture migrated from the low elevation (Chinese Loess Plateau) to the upper Yellow River valleys on the QTP and founded the earliest settlement villages (~5.9 ka) on the QTP. People of the Qijia culture adopted diversified survival strategies under the settled lifestyle. In all, we infered that SLK site may play an important role in the communication and integration between different people and cultures.

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Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia

Cited by 28 publications

References 107 publications

Effects of Vegetation Change on Soil Erosion by Water in Major Basins, Central Asia

Effects of Vegetation Change on Soil Erosion by Water in Major Basins, Central Asia

Variations of the Intensity of the Siberian High During the Last Glacial Revealed by the Sorting Coefficient of Loess‐Paleosol Deposits in Eastern Central Asia

Vegetation History and Survival Patterns of the Earliest Village on the Qinghai–Tibetan Plateau

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