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Orbital and Millennial-Scale Climate Variability over the Past 76 ka in the Western Tarim Basin, Northwest China

Journal of Earth Science 2023年第1期34卷 173-180页

作者： Rui Zhang Qiuzhen Yin Weihua Nai Zhixiang Wang Hao Lu Chunju Huang Yansheng Gu Lin Li Yusong Wang Linjing Liu College of Urban and Environmental Sciences Hubei Normal UniversityHuangshi435002China State Key Laboratory of Biogeology and Environmental Geology School of Earth SciencesChina University of GeosciencesWuhan430074China Georges Lemaître Centre for Earth and Climate Research Earth and Life InstituteUniversitéCatholique de LouvainLouvain-La-Neuve1348Belgium No.2 Hydrological and Engineering Geology Party of Xinjiang Bureau of Geology and Mineral Resources Exploration and Development Changji831100China Hubei Key Laboratory of Critical Zone Evolution School of Earth SciencesChina University of GeosciencesWuhan430074China Hubei Key Laboratory of Wetland Evolution&Eco-Restoration(WEER) China University of GeosciencesWuhan430074China School of Environmental Studies China University of GeosciencesWuhan430074China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological Sciences(CAGS)Shijiazhuang050061China

Paleoclimate changes during the last glacial in the arid central Asia are not as well understood as the monsoon-dominated areas of Asia. Here we report a 75-m-long sediment core over past 120 kyr based on astronomical tuning combined with the optically stimulated luminescence(OSL) dating in the Kashi depression of the western Tarim Basin, Northwest China. Analysis of grain size and highresolution gamma ray(GR) logs from the KT11 borehole across the last glacial period yields a climate history for the Tarim Basin which reflects the variations of its temperature and the hydrological cycles. Comparison of these records with north hemisphere summer insolation, the Greenland ice core temperature, stalagmites and the loess from the nearby region indicates that the deposits in the fluvio-lacustrine system of the Kashi depression responded to climate change at the Younger Dryas(YD), six Heinrich cooling events and the Dansgaard-Oeschger cycles. Our work indicates that the alternations between warm-humid and cold-dry climates were prevalent in the western Tarim Basin during the last glacial period, showing an in-phase pattern with the climate variations of the East Asian Monsoon, controlled ultimately by precession and North Atlantic Ocean climate variability on orbital-millennial time scales.

关键词： abrupt climate changes glacial geology last glacial period KT11 borehole western Tarim Basin

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New findings concerning the Pleistocene Glaciation of the Leh Basin,Ladakh(34°03'N/77°38'E)

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Journal of Mountain Science 2010年第4期7卷 367-374页

作者： Hermann Achenbach Geographical Institute University of GoettingenDepartment of High Mountain Geomorphology and Geography

Like for most parts of High Asia,researches concerning the Pleistocene landscape evolution of the Leh Basin(34°03' N/77°38' E) have also left *** push this topic,three up to now unexplored Ladakh Range tributaries of the Leh Basin(Stagmo-,Arzu-and Nang-Valley) have been investigated.U-shaped profiles,transfluence passes,moraine mantled and glacially rounded peaks and ridges,roches moutonnées,glacial flank polishings and ground moraines document the former glaciation of the study *** ice fillings of these tributaries reached a minimum thickness up to 540 *** at the valley outlets and on the orographic right side of the Leh Basin,the glaciation was more than 350 m *** on these empirically extracted results,theoretical snow line considerations lead to the conclusion that the whole Leh Basin was filled up by a former Indus-Valley *** ice injection limited to the nourishment areas of the Ladakh Range valleys could not have caused the reconstructed ice cover(down to 3236 m a.s.l.),which is proved by extended ground moraine *** an Indus ice stream network(most likely during the LGP),nourished by inflowing glaciers of the Ladakh-and Stok Range,explains the widespread existence of the glacial sediments at the outlets of the investigated valleys.

关键词： glacial-geomorphology Formerglaciation last glacial period Equilibrium linealtitude High Asia

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The glacial(MIS 3-2)Outlet Glacier of the Marsyandi Nadi-icestream-network with its Ngadi Khola Tributary Glacier(Manaslu-and Lamjung Himalaya):The Reconstructed Lowering of the Marsyandi Nadi Ice Stream Tongue down in to the Southern Himalaya Foreland

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Journal of Mountain Science 2014年第1期11卷 236-287页

作者： Matthias KUHLE Department of Geography and High Mountain Geomorphology University of Gottingen

For the reconstruction of past climate variations,investigations on the history of glaciers are *** the Himalaya,investigations like these have a rather short tradition in comparison with other mountains on *** the same time,this area on the southern margin of Tibet is of special interest because of the question as to the monsoon-influence that is connected with the ***,the climate of High Asia is of global *** for the further and regionally intensifying answer to this question,a glacial glacier reconstruction is submitted from the CentralHimalaya,more exactly from the *** on down-valley from the glacial-historical investigations of 1977 in the upper Marsyandi Khola(Nadi) and the partly already published results of field campaigns in the middle Marsyandi Khola and the Damodar- and Manaslu Himal in the years 1995,2000,2004 and 2007,new geomorphological and geological field- and laboratory data are introduced here from the Ngadi(Nadi) Khola and the lower Marsyandi Nadi from the inflow of the Ngadi(Nadi) Khola down to the southern mountain *** has existed a connected ice-stream-network drained down to the south by a 2,100-2,200 m thick and 120 km long Marsyandi Nadi main valley *** a height of the valley bottom of c.1,000 m *** Ngadi Khola glacier joined the still c.1,300 m thick Marsyandi parent glacier from the Himalchuli-massif(Nadi(Ngadi) Chuli) – the south spur of the Manaslu *** here the united glacier tongue flowed down about a further 44 km to the south up to c.400 m a.s.l.(27°57'38 "N/84°24'56" E) into the Himalaya fore-chains and thus reached one of or the lowest past ice margin position of the *** glacial(LGP(last glacial period),LGM(last glacial maximum) Würm,Stage 0,MIS 3-2) climatic snowline(ELA = equilibrium line altitude) has run at 3,900 to 4,000 m *** thus c.1,500 altitude meters below the current ELA(Stage XII) at 5,400-5,500 m *** r

关键词： Ice Age Glaciation Himalaya Manaslu Ngadi Khola Icestream network last glacial period

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The Pleistocene Glaciation in the Karakoram Mountains:Reconstruction of Past Glacier Extensions and Ice Thicknesses

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Journal of Mountain Science 2004年第1期1卷 3-17页

作者： Matthias Kuhle Geographical Institute University of Gtingen Department of Geography and High Mountain Geomorphology Goldschmidtstr.537077 GtingenGermany

Geomorphological and Quaternarygeological field- and laboratory data (Fig.1) are introduced and interpreted with regard to the maximum Ice Age (LGM) glaciation of the Central-and South Karakoram in the Braldu-, Basna-, Shigar-and Indus valley system as well as on the Deosai plateau between the Skardu Basin and the Astor valley (Fig.2). These data result from two research expeditions in the years 1997 and 2000. They show that between c. 60 and 20 Ka the Central Karakorum and its south slope were covered by a continuous c. 125,000 km2 sized ice stream network. This ice stream network flowed together to a joint parent glacier, the Indus glacier. The tongue end of the Indus glacier reached down to 850 ～ 800 m a.s.l. In its centre the surface of this Indus ice stream network reached a height of a good 6000 m. Its most important ice thicknesses amounted to c. 2400 ～ 2900 m.

关键词： Karakoram paleoclimate glacial geomorphology last glacial period coalescing ice stream network glacier thickness

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The influence of the Indian summer monsoon on vertical vegetation belts in Yunan（SE Tibet） over the past 68 kyr

The influence of the Indian summer monsoon on vertical veget...

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中国古生物学会孢粉学分会十届二次学术年会

作者： Xiao Zhang Zhuo Zheng Kangyou Huang Guangdong Provincial Key Laboratory of Geodynamics and Geohazards School of Earth Sciences and EngineeringSun Yat–sen University

Reconstructing past changes of paleovegetation in South-West China（SE Tibet） is key to understanding the paleoclimatic dynamics of the Indian summer monsoon（ISM）.Over the past few decades,research in this field has mainly concentrated on the Holocene and deglacial period,which limits our understanding of the evolution of the ***,we provide a 68 kyr lacustrine paleoclimatic record collected from Tengchong Qinghai Lake in SE *** pollen and charcoal analysis,combined with specific pollen identification of Quercus using scanning electron microscope,were *** results reveal that the high percentage of Quercus pollen particularly in the last glacial period was actually derived from the species of sclerophyllous Quercus living in the high plateau,which are totally different from the species of Cyclobalanopsis that is distributed at low *** vegetation stages are recorded,which corresponds to the Quercus forest of Tibetan evergreen sclerophyllous（TES） during the glacial period,evergreen broadleaved forest in the Holocene and secondary forest（Alnus） at the last 4.0 *** micro-charcoal agrees with pollen PCA-1 proxy showing that relatively high precipitation occurred in the MIS3 and the mid-Holocene,while the lowest temperature/precipitation period was 28.4–18.0 cal kyr BP,which happens to correlate with the last glacial *** center Quercus（TES） belt at the LGM was about ～1000 m lower than in present SW China,indicating a temperature 5–6℃ lower than *** simultaneous coupling of our data with the sea surface temperature in the Indian Ocean illustrates that the variability of Indian summer monsoon should be crucial for the change of energy/moisture transmission in SW China,and that the Antarctic glacial-interglacial ice-sheet changes may play a key role in driving the circulation and water temperature of the Indian Ocean.

关键词： Pollen analysis sclerophyllous Quercus South-West China last glacial period Indian summer monsoon

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