Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia
Understanding Holocene paleoclimate in arid Central Asia (ACA) is helpful for predicting future climate. However, Holocene climate patterns and their forcing mechanisms across ACA are vigorously debated in the context of global climate change. Here, we present a Holocene loess profile (SGX) from the...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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ftchinacascieeca:oai:ir.ieecas.cn:361006/14811 2023-06-11T04:14:55+02:00 Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia Sun, Huanyu Song, Yougui Chen, Xiuling Cheng, Liangqing Liu, Huifang 2020-07-15 http://ir.ieecas.cn/handle/361006/14811 https://doi.org/10.1016/j.palaeo.2020.109731 英语 eng ELSEVIER PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://ir.ieecas.cn/handle/361006/14811 doi:10.1016/j.palaeo.2020.109731 OSL ages Grain size Color index Loess Tianshan Mountains ARID CENTRAL-ASIA LOESS-PALEOSOL SEQUENCE GRAIN-SIZE DISTRIBUTION LAST GLACIAL PERIOD CHINESE LOESS MOISTURE EVOLUTION LATE QUATERNARY SUMMER MONSOON NORTH-ATLANTIC MAGNETIC-SUSCEPTIBILITY Physical Geography Geology Paleontology Geography Physical Geosciences Multidisciplinary 期刊论文 2020 ftchinacascieeca https://doi.org/10.1016/j.palaeo.2020.109731 2023-05-08T13:24:50Z Understanding Holocene paleoclimate in arid Central Asia (ACA) is helpful for predicting future climate. However, Holocene climate patterns and their forcing mechanisms across ACA are vigorously debated in the context of global climate change. Here, we present a Holocene loess profile (SGX) from the Ili Basin in the Westerlies-dominated Central Asia. Based on high-resolution, medium-grained (38-63 mu m) quartz optically stimulated luminescence (OSL) dating, and grain size and color measurements, we reconstruct the Holocene paleoclimate. OSL geochronology indicate that this SGX loess profile covers the last 11.5 ka, and grain size analyses reveal that the sediments are sandy loess, and the environmentally sensitive fractions are < 35.6 mu m and 35.6-252 mu m which represent suspensions after dust storms and proximal deposit components transported mainly during dust storms, respectively. And the redness and yellowness in the loess profile are closely related to the concentrations of hematite (Hm) and goethite (Gt); the ratio Hm/Gt also can be used to reflect the evolution of dry/humid conditions in Central Asian loess. The Holocene Westerlies-dominated climate in ACA is characterized by a dry early Holocene, persistently wet conditions in the middle and late Holocene, and a climatic optimum in the late Holocene. The winter solar insolation at 60 degrees N is considered the major forcing of Holocene climate evolution in ACA. Report North Atlantic Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) Palaeogeography, Palaeoclimatology, Palaeoecology 550 109731 |
institution |
Open Polar |
collection |
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchinacascieeca |
language |
English |
topic |
OSL ages Grain size Color index Loess Tianshan Mountains ARID CENTRAL-ASIA LOESS-PALEOSOL SEQUENCE GRAIN-SIZE DISTRIBUTION LAST GLACIAL PERIOD CHINESE LOESS MOISTURE EVOLUTION LATE QUATERNARY SUMMER MONSOON NORTH-ATLANTIC MAGNETIC-SUSCEPTIBILITY Physical Geography Geology Paleontology Geography Physical Geosciences Multidisciplinary |
spellingShingle |
OSL ages Grain size Color index Loess Tianshan Mountains ARID CENTRAL-ASIA LOESS-PALEOSOL SEQUENCE GRAIN-SIZE DISTRIBUTION LAST GLACIAL PERIOD CHINESE LOESS MOISTURE EVOLUTION LATE QUATERNARY SUMMER MONSOON NORTH-ATLANTIC MAGNETIC-SUSCEPTIBILITY Physical Geography Geology Paleontology Geography Physical Geosciences Multidisciplinary Sun, Huanyu Song, Yougui Chen, Xiuling Cheng, Liangqing Liu, Huifang Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia |
topic_facet |
OSL ages Grain size Color index Loess Tianshan Mountains ARID CENTRAL-ASIA LOESS-PALEOSOL SEQUENCE GRAIN-SIZE DISTRIBUTION LAST GLACIAL PERIOD CHINESE LOESS MOISTURE EVOLUTION LATE QUATERNARY SUMMER MONSOON NORTH-ATLANTIC MAGNETIC-SUSCEPTIBILITY Physical Geography Geology Paleontology Geography Physical Geosciences Multidisciplinary |
description |
Understanding Holocene paleoclimate in arid Central Asia (ACA) is helpful for predicting future climate. However, Holocene climate patterns and their forcing mechanisms across ACA are vigorously debated in the context of global climate change. Here, we present a Holocene loess profile (SGX) from the Ili Basin in the Westerlies-dominated Central Asia. Based on high-resolution, medium-grained (38-63 mu m) quartz optically stimulated luminescence (OSL) dating, and grain size and color measurements, we reconstruct the Holocene paleoclimate. OSL geochronology indicate that this SGX loess profile covers the last 11.5 ka, and grain size analyses reveal that the sediments are sandy loess, and the environmentally sensitive fractions are < 35.6 mu m and 35.6-252 mu m which represent suspensions after dust storms and proximal deposit components transported mainly during dust storms, respectively. And the redness and yellowness in the loess profile are closely related to the concentrations of hematite (Hm) and goethite (Gt); the ratio Hm/Gt also can be used to reflect the evolution of dry/humid conditions in Central Asian loess. The Holocene Westerlies-dominated climate in ACA is characterized by a dry early Holocene, persistently wet conditions in the middle and late Holocene, and a climatic optimum in the late Holocene. The winter solar insolation at 60 degrees N is considered the major forcing of Holocene climate evolution in ACA. |
format |
Report |
author |
Sun, Huanyu Song, Yougui Chen, Xiuling Cheng, Liangqing Liu, Huifang |
author_facet |
Sun, Huanyu Song, Yougui Chen, Xiuling Cheng, Liangqing Liu, Huifang |
author_sort |
Sun, Huanyu |
title |
Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia |
title_short |
Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia |
title_full |
Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia |
title_fullStr |
Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia |
title_full_unstemmed |
Holocene dust deposition in the Ili Basin and its implications for climate variations in Westerlies-dominated Central Asia |
title_sort |
holocene dust deposition in the ili basin and its implications for climate variations in westerlies-dominated central asia |
publisher |
ELSEVIER |
publishDate |
2020 |
url |
http://ir.ieecas.cn/handle/361006/14811 https://doi.org/10.1016/j.palaeo.2020.109731 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://ir.ieecas.cn/handle/361006/14811 doi:10.1016/j.palaeo.2020.109731 |
op_doi |
https://doi.org/10.1016/j.palaeo.2020.109731 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
550 |
container_start_page |
109731 |
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1768371297097613312 |