Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits
Knowledge of the interactions among atmospheric dynamics, dust emissions and climate system is essential to understand the physical mechanisms for the dust lifecycle, their role in loess formation as well as the predictions of future dust concentration. However, these issues still remain relatively...
Published in: | Geoscience Frontiers |
---|---|
Main Authors: | , , , , , , |
Format: | Report |
Language: | English |
Published: |
CHINA UNIV GEOSCIENCES, BEIJING
2021
|
Subjects: | |
Online Access: | http://ir.ieecas.cn/handle/361006/16978 http://ir.ieecas.cn/handle/361006/16979 https://doi.org/10.1016/j.gsf.2021.101180 |
id |
ftchinacascieeca:oai:ir.ieecas.cn:361006/16979 |
---|---|
record_format |
openpolar |
spelling |
ftchinacascieeca:oai:ir.ieecas.cn:361006/16979 2023-06-11T04:12:53+02:00 Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits Li, Yue Song, Yougui Kaskaoutis, Dimitris G. Zan, Jinbo Orozbaev, Rustam Tan, Liangcheng Chen, Xiuling 2021-09-01 http://ir.ieecas.cn/handle/361006/16978 http://ir.ieecas.cn/handle/361006/16979 https://doi.org/10.1016/j.gsf.2021.101180 英语 eng CHINA UNIV GEOSCIENCES, BEIJING GEOSCIENCE FRONTIERS http://ir.ieecas.cn/handle/361006/16978 http://ir.ieecas.cn/handle/361006/16979 doi:10.1016/j.gsf.2021.101180 Dust dynamics Climate Atmospheric patterns Loess Ice volume Fergana Valley ATMOSPHERIC CIRCULATION PATTERNS ARID CENTRAL-ASIA INTERGLACIAL-GLACIAL CYCLE GRAIN-SIZE DISTRIBUTIONS LATE QUATERNARY LOESS CHINESE LOESS PALEOSOL SEQUENCE MAGNETIC-SUSCEPTIBILITY LATE PLEISTOCENE NORTH-ATLANTIC Geology Geosciences Multidisciplinary 期刊论文 2021 ftchinacascieeca https://doi.org/10.1016/j.gsf.2021.101180 2023-05-08T13:25:23Z Knowledge of the interactions among atmospheric dynamics, dust emissions and climate system is essential to understand the physical mechanisms for the dust lifecycle, their role in loess formation as well as the predictions of future dust concentration. However, these issues still remain relatively poorly known in Central Asia (CA). The extensive loess deposits on the CA pediments provide a promising archive to explore atmospheric dust dynamics and climatic conditions in the past and their association with loess formation. This study investigates the granulometric and magnetic properties of a loess section (named Osh section) in the Fergana Valley, which provides a sensitive record of atmospheric dust dynamics since 30 ka based on radiometric (AMS C-14) dating. The frequency-dependent magnetic susceptibility (chi(fd)) and the mean grain size are used to reconstruct the broad-scale effective moisture and summer atmospheric dynamics pattern in CA, respectively. The results show that the precession forcing exerts a huge influence on the wind-regime variabilities in CA, but with different physical processes under the impact of the Northern Hemisphere ice sheet (NHIS) before and after 15 ka. The origin of the sedimentation rate variations in the Osh loess is also linked to the NHIS-modulated changes of the atmospheric circulation patterns. Either the strengthened westerlies or the increased surface roughness from higher vegetation cover in loess-deposition areas have significantly accelerated the loess accumulation. As a result, these complicated influence factors of sedimentation rate change in the Osh loess section, especially during the Holocene epoch, may hamper accessibility of the authentic dust emission flux and atmospheric dust concentration in CA. (C) 2021 ChinaUniversity of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. Report Ice Sheet North Atlantic Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Geoscience Frontiers 12 5 101180 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
Dust dynamics Climate Atmospheric patterns Loess Ice volume Fergana Valley ATMOSPHERIC CIRCULATION PATTERNS ARID CENTRAL-ASIA INTERGLACIAL-GLACIAL CYCLE GRAIN-SIZE DISTRIBUTIONS LATE QUATERNARY LOESS CHINESE LOESS PALEOSOL SEQUENCE MAGNETIC-SUSCEPTIBILITY LATE PLEISTOCENE NORTH-ATLANTIC Geology Geosciences Multidisciplinary |
spellingShingle |
Dust dynamics Climate Atmospheric patterns Loess Ice volume Fergana Valley ATMOSPHERIC CIRCULATION PATTERNS ARID CENTRAL-ASIA INTERGLACIAL-GLACIAL CYCLE GRAIN-SIZE DISTRIBUTIONS LATE QUATERNARY LOESS CHINESE LOESS PALEOSOL SEQUENCE MAGNETIC-SUSCEPTIBILITY LATE PLEISTOCENE NORTH-ATLANTIC Geology Geosciences Multidisciplinary Li, Yue Song, Yougui Kaskaoutis, Dimitris G. Zan, Jinbo Orozbaev, Rustam Tan, Liangcheng Chen, Xiuling Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits |
topic_facet |
Dust dynamics Climate Atmospheric patterns Loess Ice volume Fergana Valley ATMOSPHERIC CIRCULATION PATTERNS ARID CENTRAL-ASIA INTERGLACIAL-GLACIAL CYCLE GRAIN-SIZE DISTRIBUTIONS LATE QUATERNARY LOESS CHINESE LOESS PALEOSOL SEQUENCE MAGNETIC-SUSCEPTIBILITY LATE PLEISTOCENE NORTH-ATLANTIC Geology Geosciences Multidisciplinary |
description |
Knowledge of the interactions among atmospheric dynamics, dust emissions and climate system is essential to understand the physical mechanisms for the dust lifecycle, their role in loess formation as well as the predictions of future dust concentration. However, these issues still remain relatively poorly known in Central Asia (CA). The extensive loess deposits on the CA pediments provide a promising archive to explore atmospheric dust dynamics and climatic conditions in the past and their association with loess formation. This study investigates the granulometric and magnetic properties of a loess section (named Osh section) in the Fergana Valley, which provides a sensitive record of atmospheric dust dynamics since 30 ka based on radiometric (AMS C-14) dating. The frequency-dependent magnetic susceptibility (chi(fd)) and the mean grain size are used to reconstruct the broad-scale effective moisture and summer atmospheric dynamics pattern in CA, respectively. The results show that the precession forcing exerts a huge influence on the wind-regime variabilities in CA, but with different physical processes under the impact of the Northern Hemisphere ice sheet (NHIS) before and after 15 ka. The origin of the sedimentation rate variations in the Osh loess is also linked to the NHIS-modulated changes of the atmospheric circulation patterns. Either the strengthened westerlies or the increased surface roughness from higher vegetation cover in loess-deposition areas have significantly accelerated the loess accumulation. As a result, these complicated influence factors of sedimentation rate change in the Osh loess section, especially during the Holocene epoch, may hamper accessibility of the authentic dust emission flux and atmospheric dust concentration in CA. (C) 2021 ChinaUniversity of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. |
format |
Report |
author |
Li, Yue Song, Yougui Kaskaoutis, Dimitris G. Zan, Jinbo Orozbaev, Rustam Tan, Liangcheng Chen, Xiuling |
author_facet |
Li, Yue Song, Yougui Kaskaoutis, Dimitris G. Zan, Jinbo Orozbaev, Rustam Tan, Liangcheng Chen, Xiuling |
author_sort |
Li, Yue |
title |
Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits |
title_short |
Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits |
title_full |
Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits |
title_fullStr |
Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits |
title_full_unstemmed |
Aeolian dust dynamics in the Fergana Valley, Central Asia, since similar to 30 ka inferred from loess deposits |
title_sort |
aeolian dust dynamics in the fergana valley, central asia, since similar to 30 ka inferred from loess deposits |
publisher |
CHINA UNIV GEOSCIENCES, BEIJING |
publishDate |
2021 |
url |
http://ir.ieecas.cn/handle/361006/16978 http://ir.ieecas.cn/handle/361006/16979 https://doi.org/10.1016/j.gsf.2021.101180 |
genre |
Ice Sheet North Atlantic |
genre_facet |
Ice Sheet North Atlantic |
op_relation |
GEOSCIENCE FRONTIERS http://ir.ieecas.cn/handle/361006/16978 http://ir.ieecas.cn/handle/361006/16979 doi:10.1016/j.gsf.2021.101180 |
op_doi |
https://doi.org/10.1016/j.gsf.2021.101180 |
container_title |
Geoscience Frontiers |
container_volume |
12 |
container_issue |
5 |
container_start_page |
101180 |
_version_ |
1768389024606584832 |